CN114570052B - Method and device for continuously producing diethyl maleate - Google Patents
Method and device for continuously producing diethyl maleate Download PDFInfo
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- CN114570052B CN114570052B CN202210208069.8A CN202210208069A CN114570052B CN 114570052 B CN114570052 B CN 114570052B CN 202210208069 A CN202210208069 A CN 202210208069A CN 114570052 B CN114570052 B CN 114570052B
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- IEPRKVQEAMIZSS-UHFFFAOYSA-N Di-Et ester-Fumaric acid Natural products CCOC(=O)C=CC(=O)OCC IEPRKVQEAMIZSS-UHFFFAOYSA-N 0.000 title claims abstract description 19
- IEPRKVQEAMIZSS-WAYWQWQTSA-N Diethyl maleate Chemical compound CCOC(=O)\C=C/C(=O)OCC IEPRKVQEAMIZSS-WAYWQWQTSA-N 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 11
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000002904 solvent Substances 0.000 claims abstract description 31
- 238000003756 stirring Methods 0.000 claims description 25
- 239000002351 wastewater Substances 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 5
- 239000012044 organic layer Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000011344 liquid material Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000010924 continuous production Methods 0.000 abstract description 2
- 239000003381 stabilizer Substances 0.000 abstract description 2
- 229940079593 drug Drugs 0.000 abstract 1
- 239000003814 drug Substances 0.000 abstract 1
- 239000000575 pesticide Substances 0.000 abstract 1
- 235000013599 spices Nutrition 0.000 abstract 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
- C07C67/54—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a method and a device for continuously producing diethyl maleate, which relate to the technical field of production of high-efficiency pesticides, medicines, spices and water quality stabilizers, and comprise the following steps: the device comprises a maleic anhydride solvent kettle, wherein the top end of the maleic anhydride solvent kettle is connected with a material feeding solvent kettle inlet, and the bottom end of the maleic anhydride solvent kettle is provided with a pipeline connected with a delivery pump A; the rectifying tower comprises a rectifying tower body, wherein a pipeline is arranged on one side of the rectifying tower body and is connected and communicated with a delivery pump A, four groups of feed inlets are formed outside the rectifying tower body, so that a guarantee is provided for continuous production of diethyl maleate, the production yield can be improved, manual operation can be reduced, the product stability can be improved, automation can be realized, the unit cost can be reduced, the safety can be improved, and the like.
Description
Technical Field
The invention relates to the technical field of stabilizer production, in particular to a method and a device for continuously producing diethyl maleate.
Background
The production of diethyl maleate is currently carried out by an intermittent method, and the intermittent method has the defects of small feeding amount, complicated manual operation, poor product stability, unsuitability for the production of large-tonnage commodities, difficult realization of automation, poor continuity, higher unit cost and poor safety.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for continuously producing diethyl maleate, which has an impeller and a stirring blade, can provide a rotary stirring function, and can realize power supply through the driven capability of steam expansion.
The invention provides a method and a device for continuously producing diethyl maleate, which specifically comprise the following steps: the device comprises a maleic anhydride solvent kettle, wherein the top end of the maleic anhydride solvent kettle is connected with a material feeding solvent kettle inlet, and the bottom end of the maleic anhydride solvent kettle is provided with a pipeline connected with a delivery pump A; the device comprises a rectifying tower body, wherein a pipeline is arranged on one side of the rectifying tower body and is communicated with a conveying pump A, and four groups of feed inlets are arranged outside the rectifying tower body; the rectifying tower reboiler is fixedly arranged at the bottom end of the rectifying tower body through welding; one end of the eccentric bin is provided with an eccentric pipeline which is communicated with the top end of the rectifying tower body; the rectifying tower condenser is fixedly arranged at the top of one side of the rectifying tower body; a separation net is arranged inside the rectifying tower body; the stirring shaft is rotationally arranged in the eccentric bin and the stirring shaft; the device comprises a rectifying tower condensing pipe, a rectifying tower condensing tank, a rectifying tower condensate intermediate tank and a conveying pump B, wherein the rectifying tower condensing pipe is fixedly arranged in a rectifying tower condenser, the bottom of the rectifying tower condensing pipe penetrates through the rectifying tower condenser and is connected with the rectifying tower condensate intermediate tank, and the bottom of the rectifying tower condensate intermediate tank is connected with the conveying pump B; the middle of the outer side of the condensate layering tower is provided with a pipeline which is communicated with a delivery pump B; the middle of the bottom of the condensate layering tower is connected with a wastewater outlet; the top of the condensate layering tower is communicated with the top of the maleic anhydride solvent kettle through a pipeline.
Optionally, four groups of through holes are formed in the outer portion of the rectifying tower body, and a rectifying tower view cup window is arranged in the through holes in a sealing mode in cooperation with heat-resistant glue.
Optionally, a rectifying tower temperature measuring couple is fixedly arranged on one side of the rectifying tower body.
Optionally, a reboiler steam condenser pipe is arranged inside the rectifying tower reboiler, and both ends of the reboiler steam condenser pipe are located outside the rectifying tower reboiler; a discharge hole is arranged at the bottom of one side of the rectifying tower reboiler.
Optionally, a reboiler thermocouple is fixedly arranged at the top of the rectifying tower reboiler, and the reboiler thermocouple and the reboiler steam condensation pipe are staggered.
Optionally, the top end of the rectifying tower condensation pipe is communicated with the other end of the eccentric bin through a pipeline.
Optionally, the bottom of the stirring shaft is fixedly provided with a stirring blade, and the stirring blade is positioned in the rectifying tower condenser; the top end of the stirring shaft is fixedly provided with an impeller which is positioned in the eccentric bin.
Optionally, the bottom of the condensate layering tower is connected with a wastewater outlet, and the top of the condensate layering tower is directly connected with the top end of the maleic anhydride solvent kettle through a pipeline.
Optionally, the method comprises the following steps:
1. light components in reaction materials of the equipment are heated into steam by a rectifying tower reboiler, the steam reacts with the materials in a rectifying tower body to obtain a product, the liquid materials are uniformly distributed through a separation net and better participate in the reaction, the distribution state of the materials is observed through a view cup window of the rectifying tower, and the temperature of each point is monitored by a temperature measuring couple of the rectifying tower;
2. dissolving materials according to the proportion in a maleic anhydride solvent kettle, conveying the materials to feed inlets at different positions from bottom to top of a rectifying tower body through a conveying pump A, respectively feeding maleic anhydride solution or a material from each feed inlet, heating the materials in a rectifying tower reboiler by steam, and displaying the temperature of the materials in the reboiler in real time by a reboiler thermocouple; the steam in the rectifying tower body passes through the eccentric bin and the rectifying tower condenser pipe, enters a rectifying tower condensate intermediate tank after being cooled, and is conveyed to a condensate layering tower through a conveying pump B for dynamic layering;
3. and the condensate waste water layer is conveyed to an environment-friendly station through a waste water outlet for harmless treatment, and the condensate organic layer is conveyed to the maleic anhydride solvent kettle through a top pipeline of a condensate layering tower for recycling.
Advantageous effects
The invention solves the problems in the background art, provides guarantee for the continuous production of diethyl maleate, and can improve the production yield, reduce manual operation, improve the product stability, realize automation, reduce unit cost and improve safety.
In addition, the setting of (mixing) shaft provides driven effect, can utilize the driven nature of power that steam expansion atmospheric pressure increased the provision to carry out power conversion, stirs rectifying column condenser water-logging.
In addition, the condensate layering tower can provide a flow dividing effect, can provide a purification effect, and treats and differentiates the cooling liquid.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
The drawings in the following description relate to only some embodiments of the invention and are not intended to limit the invention.
In the drawings:
FIG. 1 shows a front view schematic according to an embodiment of the invention;
FIG. 2 shows a side view schematic according to an embodiment of the invention;
FIG. 3 shows a schematic perspective view of an embodiment according to the invention;
FIG. 4 shows a partial cross-sectional structural schematic according to an embodiment of the invention;
FIG. 5 shows a schematic perspective view of a stirring shaft according to an embodiment of the present invention;
FIG. 6 shows a schematic perspective view of a rectifying tower condenser tube according to an embodiment of the present invention;
fig. 7 shows a schematic diagram of a partially enlarged structure according to an embodiment of the invention.
List of reference numerals
1. A maleic anhydride solvent kettle; 101. the material is fed into the inlet of the dissolving kettle; 102. a delivery pump A; 2. a rectifying tower body; 201. a view cup window of the rectifying tower; 3. a rectifying tower temperature measuring couple; 4. a rectifying tower reboiler; 401. a reboiler steam condenser tube; 402. a discharge port; 5. a reboiler thermocouple; 6. an eccentric bin; 7. a rectifying tower condenser; 8. a stirring shaft; 801. stirring blades; 802. an impeller; 9. a rectifying tower condenser pipe; 10. a delivery pump B; 11. a condensate layering tower; 1101. a waste water outlet; 12. a rectifying tower condensate intermediate tank.
Detailed Description
In order to make the objects, aspects and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. Unless otherwise indicated, terms used herein have the ordinary meaning in the art. Like reference symbols in the various drawings indicate like elements.
Example (b): please refer to fig. 1 to 7:
the invention provides a method and a device for continuously producing diethyl maleate, comprising the following steps: the device comprises a maleic anhydride solvent kettle 1, wherein the top end of the maleic anhydride solvent kettle 1 is connected with a material feeding solvent kettle inlet 101, and the bottom end of the maleic anhydride solvent kettle 1 is provided with a pipeline connected with a delivery pump A102; a rectifying tower body 2, wherein a pipeline is arranged on one side of the rectifying tower body 2 and is communicated with a delivery pump A102, a one-way valve is arranged in the pipeline, and four groups of feed inlets are arranged outside the rectifying tower body 2; the rectifying tower reboiler 4 is fixedly arranged at the bottom end of the rectifying tower body 2 through welding; one end of the eccentric bin 6 is provided with an eccentric pipeline which is communicated with the top end of the rectifying tower body 2; the rectifying tower condenser 7 is fixedly arranged at the top of one side of the rectifying tower body 2; a separation net is arranged inside the rectifying tower body 2; the stirring shaft 8 is rotationally arranged in the eccentric bin 6 and the stirring shaft 8; the device comprises a rectifying tower condenser pipe 9, wherein the rectifying tower condenser pipe 9 is fixedly arranged in a rectifying tower condenser 7, the bottom of the rectifying tower condenser pipe 9 penetrates through the rectifying tower condenser 7 to be connected with a rectifying tower condensate intermediate tank 12, and the bottom of the rectifying tower condensate intermediate tank 12 is connected with a conveying pump B10; a condensate layering tower 11, wherein a pipeline is arranged in the middle of the outer side of the condensate layering tower 11 and is communicated with a delivery pump B10; a waste water outlet 1101 is connected in the middle of the bottom of the condensate layering tower 11; the top of the condensate layering tower 11 is communicated with the top of the maleic anhydride solvent kettle 1 through a pipeline.
In addition, according to the embodiment of the invention, four sets of through holes are formed outside the rectifying tower body 2, and a rectifying tower view cup window 201 is arranged in the through holes in a sealing manner by matching with heat-resistant glue.
In addition, according to the embodiment of the invention, a rectifying tower temperature measuring couple 3 is fixedly arranged on one side of the rectifying tower body 2.
In addition, according to the embodiment of the present invention, a reboiler steam condenser 401 is disposed inside the rectifying tower reboiler 4, and both ends of the reboiler steam condenser 401 are located outside the rectifying tower reboiler 4; a discharge hole 402 is arranged at the bottom of one side of the rectifying tower reboiler 4.
In addition, according to the embodiment of the invention, a reboiler thermocouple 5 is fixedly arranged at the top of the rectifying tower reboiler 4, and the reboiler thermocouple 5 is staggered with the reboiler steam condensation pipe 401.
In addition, according to the embodiment of the invention, the top end of the rectifying tower condensation pipe 9 is communicated with the other end of the eccentric bin 6 through a pipeline.
In addition, according to the embodiment of the invention, the bottom of the stirring shaft 8 is fixedly provided with a stirring blade 801, and the stirring blade 801 is positioned in the rectifying tower condenser 7; the top end of the stirring shaft 8 is fixedly provided with an impeller 802, and the impeller 802 is positioned in the eccentric bin 6.
In addition, according to the embodiment of the present invention, the bottom of the condensate layering tower 11 is connected to a waste water outlet 1101, and the top of the condensate layering tower 11 is directly connected to the top of the maleic anhydride solvent kettle 1 through a pipeline.
The working principle of the invention is as follows:
maleic anhydride and ethanol react under the action of concentrated sulfuric acid as a catalyst to produce diethyl maleate, and then water generated is taken out of a reaction system under the ternary azeotropic condition, wherein the reaction equation is as follows:
maleic anhydride: benzene: ethanol: the mol ratio of concentrated sulfuric acid is 1.8-2.0;
the dissolving temperature of the maleic anhydride dissolving kettle 1 is 30-40 ℃;
heating 20-70% of solvent benzene by weight into steam, inputting the steam into the rectifying tower body 2 through a feed inlet of the rectifying tower body 2, wherein the steam feed inlet is arranged at the lower end of a mixed material feed inlet;
the temperature of the temperature measuring couple 3 of the upper rectifying tower is 64.8 ℃, and the temperature of the temperature measuring couple 3 of the lower rectifying tower is 80.1 ℃;
the condensate of the rectifying tower dynamically stands for 1.5 to 2 hours in the condensate layering tower 11;
light components in reaction materials of the equipment are heated into steam by a rectifying tower reboiler 4, the steam reacts with the materials in a rectifying tower body 2 to obtain products, the liquid materials are uniformly distributed through a separation net and better participate in the reaction, the distribution state of the materials is observed through a rectifying tower view cup window 201, and the temperature of each point is monitored by a rectifying tower temperature measuring couple 3;
the materials according to the proportion are dissolved in a maleic anhydride solvent kettle 1, the materials are conveyed to feed inlets at different positions of a rectifying tower body 2 from bottom to top through a conveying pump A102, a maleic anhydride solution or one material is respectively fed from each feed inlet, the materials in a rectifying tower reboiler 4 are heated through steam, and a reboiler thermocouple 5 displays the temperature of the materials in the reboiler in real time; the steam in the rectifying tower body 2 passes through the eccentric bin 6 and the rectifying tower condenser pipe 9, is cooled and then enters a rectifying tower condensate intermediate tank 12, and the condensate is conveyed to a condensate layering tower 11 through a conveying pump B10 for dynamic layering;
the condensate waste water layer is conveyed to an environment-friendly station through a waste water outlet 1101 for harmless treatment, and the condensate organic layer is conveyed to the maleic anhydride dissolving kettle 1 through a top pipeline of a condensate layering tower 11 for recycling.
The specific use mode and function of the embodiment are as follows:
example 1
According to mol ratio, maleic anhydride: benzene: ethanol: concentrated sulfuric acid =1, 2.0 3 The flow rate of the solution is changed by the delivery pump A102Conveying a dianhydride solution to a rectifying tower body 2, monitoring the temperature of a rectifying tower temperature measuring couple 3, and observing the material distribution state and the reflux condition at each position through a rectifying tower sight glass window 201; rectifying column material steam gets into rectifying column condenser pipe 9 in, and from getting into rectifying column condensate pans 12 after the cooling of cooperation rectifying column condenser 7, then gets into condensate layering tower 11, in the organic layer of condensate got into maleic anhydride solvent cauldron 1, realize the cyclic utilization of material, condensate water layer waste water discharged from waste water outlet 1101 and sent to the environmental protection station, send to next level environmental protection station after innocent treatment and arrange outward.
The obtained diethyl maleate has a content of 98.8% and a yield of 97.3%.
Example 2
According to mol ratio, maleic anhydride: benzene: ethanol: concentrated sulfuric acid =1, 2.1 3 The maleic anhydride solution is conveyed to the rectifying tower body 2 through the conveying pump A102 at the flow speed of/h, the temperature of the rectifying tower temperature measuring couple 3 is monitored, and the material distribution state and the reflux condition at each position are observed through a rectifying tower visual cup window 201; rectifying column material steam gets into rectifying column condenser pipe 9 in, and from getting into rectifying column condensate pans 12 after the cooling of cooperation rectifying column condenser 7, then gets into condensate layering tower 11, in the organic layer of condensate got into maleic anhydride solvent cauldron 1, realize the cyclic utilization of material, condensate water layer waste water discharged from waste water outlet 1101 and sent to the environmental protection station, send to next level environmental protection station after innocent treatment and arrange outward.
The obtained diethyl maleate has a content of 99.1% and a yield of 97.8%.
Finally, it should be noted that, when describing the positions of the components and the matching relationship therebetween, the present invention is usually illustrated by one/a pair of components, however, it should be understood by those skilled in the art that such positions, matching relationship, etc. are also applicable to other/other pairs of components.
The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.
Claims (6)
1. The device for continuously producing diethyl maleate is characterized by comprising the following components: the device comprises a maleic anhydride solvent kettle (1), wherein the top end of the maleic anhydride solvent kettle (1) is connected with a material feeding solvent kettle inlet (101), and the bottom end of the maleic anhydride solvent kettle (1) is provided with a pipeline connected with a delivery pump A (102); the device comprises a rectifying tower body (2), wherein a pipeline is arranged on one side of the rectifying tower body (2) and is communicated with a conveying pump A (102), and four groups of feed inlets are arranged outside the rectifying tower body (2); the rectifying tower reboiler (4) is fixedly arranged at the bottom end of the rectifying tower body (2) through welding; one end of the eccentric bin (6) is provided with an eccentric pipeline which is communicated with the top end of the rectifying tower body (2); the rectifying tower condenser (7), the rectifying tower condenser (7) is fixedly arranged at the top of one side of the rectifying tower body (2); a separation net is arranged inside the rectifying tower body (2); the stirring shaft (8), the stirring shaft (8) is rotatably arranged in the eccentric bin (6) and the stirring shaft (8); the bottom of the stirring shaft (8) is fixedly provided with a stirring blade (801), and the stirring blade (801) is positioned in the rectifying tower condenser (7); the top end of the stirring shaft (8) is fixedly provided with an impeller (802), and the impeller (802) is positioned in the eccentric bin (6); the device comprises a rectifying tower condensation pipe (9), wherein the rectifying tower condensation pipe (9) is fixedly arranged in a rectifying tower condenser (7), the bottom of the rectifying tower condensation pipe (9) penetrates through the rectifying tower condenser (7) to be connected with a rectifying tower condensate intermediate tank (12), and the bottom of the rectifying tower condensate intermediate tank (12) is connected with a conveying pump B (10); the top end of the rectifying tower condensing tube (9) is communicated with the other end of the eccentric bin (6) through a pipeline; the middle of the outer side of the condensate layering tower (11) is provided with a pipeline which is communicated with a delivery pump B (10); the middle of the bottom of the condensate layering tower (11) is connected with a waste water outlet (1101); the top of the condensate liquid layering tower (11) is communicated with the top of the maleic anhydride solvent kettle (1) through a pipeline; the bottom of the condensate layering tower (11) is connected with a wastewater outlet (1101), and the top of the condensate layering tower (11) is directly connected with the top of the maleic anhydride solvent kettle (1) through a pipeline.
2. The apparatus for continuously producing diethyl maleate according to claim 1, wherein four sets of through holes are formed outside the rectifying tower body (2), and a rectifying tower view cup window (201) is arranged in the through holes in a sealing manner by matching with heat-resistant glue.
3. The apparatus for continuously producing diethyl maleate according to claim 1, wherein a rectifying tower thermometric couple (3) is fixedly arranged at one side of the rectifying tower body (2).
4. The apparatus for continuously producing diethyl maleate according to claim 1, wherein a reboiler steam condenser (401) is disposed inside the rectifying tower reboiler (4), and both ends of the reboiler steam condenser (401) are located outside the rectifying tower reboiler (4); a discharge hole (402) is arranged at the bottom of one side of the rectifying tower reboiler (4).
5. The apparatus for continuously producing diethyl maleate according to claim 1, wherein a reboiler thermocouple (5) is fixedly arranged at the top of the rectifier reboiler (4), and the reboiler thermocouple (5) is staggered with the reboiler steam condenser (401).
6. A method for continuously producing diethyl maleate, using the apparatus of claim 1, comprising the steps of:
1) heating light components in the reaction materials of the equipment into steam by a rectifying tower reboiler (4), reacting the steam with the materials in a rectifying tower body (2) to obtain a product, uniformly distributing the liquid materials through a separation net to better participate in the reaction, observing the distribution state of the materials by a rectifying tower sight cup window (201), and monitoring the temperature of each point by a rectifying tower temperature measuring couple (3);
2) The materials according to the proportion are dissolved in a maleic anhydride solvent kettle (1), the materials are conveyed to feed inlets at different positions from bottom to top of a rectifying tower body (2) through a conveying pump A (102), maleic anhydride solution or one material is respectively fed from each feed inlet, the materials in a rectifying tower reboiler (4) are heated through steam, and a reboiler thermocouple (5) displays the temperature of the materials in the reboiler in real time; steam in the rectifying tower body (2) passes through the eccentric bin (6) and the rectifying tower condenser pipe (9), and enters a rectifying tower condensate intermediate tank (12) after being cooled, and the condensate is conveyed to a condensate layering tower (11) through a conveying pump B (10) for dynamic layering;
3) And the condensate waste water layer is conveyed to an environment-friendly station through a waste water outlet (1101) for harmless treatment, and the condensate organic layer is conveyed to the maleic anhydride solvent kettle (1) through a top pipeline of a condensate layering tower (11) for recycling.
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| CN202210208069.8A CN114570052B (en) | 2022-03-04 | 2022-03-04 | Method and device for continuously producing diethyl maleate |
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| CN202210208069.8A CN114570052B (en) | 2022-03-04 | 2022-03-04 | Method and device for continuously producing diethyl maleate |
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| CN107827778A (en) * | 2017-10-30 | 2018-03-23 | 烟台国邦化工机械科技有限公司 | A kind of continuous rectification refines cyanoacetate compound device and its technique |
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| US5203970A (en) * | 1990-02-28 | 1993-04-20 | Ellis Jr John C | Method for water degasification and distillation |
| CN104262140B (en) * | 2014-09-22 | 2015-11-18 | 江苏九天高科技股份有限公司 | Method and the device of ethyl maleate are produced in a kind of rectifying-water vapour penetration coupling |
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