CN105344211A - Method for efficiently removing impurities in methanol washed in low-temperature methanol washing system - Google Patents
Method for efficiently removing impurities in methanol washed in low-temperature methanol washing system Download PDFInfo
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- CN105344211A CN105344211A CN201510874505.5A CN201510874505A CN105344211A CN 105344211 A CN105344211 A CN 105344211A CN 201510874505 A CN201510874505 A CN 201510874505A CN 105344211 A CN105344211 A CN 105344211A
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Abstract
The invention discloses a method for efficiently removing impurities in methanol washed in a low-temperature methanol washing system. The method comprises the following steps: conveying unqualified methanol obtained after regeneration in the conventional low-temperature methanol washing system to a separator, and adding boiler water into the separator; performing extraction operation according to the principle that the solubility of methanol in water is considerably higher than those of other organic impurities in water, and then injecting nitrogen with the pressure of 0.3-0.4 MPaG into the separator; finishing gas stripping operation according to Henry's law; discharging exhaust containing the organic impurities into a flare system through a pressure regulating valve, returning a methanol aqueous solution at the bottom of the separator to the low-temperature methanol washing system for methanol dehydration operation, and regenerating methanol meeting the requirements for production, so as to realize methanol recycling. Through adoption of the method, the removing effect on fusel and other organic impurities in methanol can reach up to 66.98%, and methanol of which the organic matter impurities are removed can meet the recycling specification requirements.
Description
Technical field
The present invention relates to low-temperature rectisol technical field, particularly relate to the removal methods of impurity content exceeding index rear impurity in a kind of methanol device low-temperature rectisol washing methyl alcohol.
Background technology
Low-temp methanol washing process is a kind of acid gas purifying technique that German Linde Co and LURGI research and develop jointly, 1954, first LURGI of Germany has built up first set low temperature washing device for methanol in the world in synthetic fuel gas factory of South Africa sasol company, up to the present, there has been the low temperature washing device for methanol of cover up to a hundred in the whole world.Low-temperature rectisol is a kind of physical absorption process, and it is using methyl alcohol as the absorbing liquid of sour gas, utilizes methyl alcohol under the low temperature of-60 DEG C ~ about-50 DEG C to the great physical characteristic of sour gas solubility, optionally can absorb the H in unstripped gas
2s, CO
2and the impurity such as various organic sulfurs.At present, low-temp methanol washing process has been widely used in the industrial installations such as synthetic ammonia installation, methanol synthesizer, carbonylation synthesis device, industrial hydrogen production and selexol process very much.
With plant running, the impurity brought by front system can constantly accumulate in rectisol system, wherein H2S, the impurity such as CO2 can remove in low-temperature rectisol Mathanol regenerating system, but some organic matter class impurity are as the alcohols of sulfur-bearing, the impurity such as ethers cannot regenerate completely by Mathanol regenerating, if can directly cause low-temp methanol to decline to the assimilation effect of sour gas when this type of impurity content is too high in system methyl alcohol, and then cause rectisol system to export total sulfur content index exceeding standard in decontaminating syngas, sulfur-bearing synthesis gas enters methyl alcohol synthetic reactor and will directly cause methanol synthesis catalyst poisoning, cause the permanent inactivation of catalyst, thus the steady and continuous affecting methanol device is run.
Summary of the invention
In order to solve problems of the prior art, the invention provides the method for impurity in a kind of efficient removal rectisol system washing methyl alcohol, overcome rectisol system in prior art cannot be removed by existing apparatus impurity, in system, low-temp methanol can not meet the problem that regeneration recycling requires.
Technical scheme of the present invention is: a kind of method of impurity in efficient removal rectisol system washing methyl alcohol, underproof methyl alcohol after existing rectisol system regeneration is delivered to separator, boiler water is added in separator, the solubility of methyl alcohol in water is utilized to carry out extracting operation much larger than the principle of other organic impurities solubility in water, the nitrogen that pressure is 0.3 ~ 0.4MPag is passed into again in separator, Henry's law is utilized to complete air lift operation, the waste gas carrying organic impurities secretly enters flare system by pressure-regulating valve, the methanol aqueous solution of separator bottom is sent rectisol system back to and is carried out methanol dehydration operation, bear again the methyl alcohol that meets need of production for the production of, realize the recycling of methyl alcohol.
Described methanol solution mixes with the ratio of boiler water according to mass ratio 1:1.5.
Described methanol solution and boiler water leave standstill more than 1 hour in the separator, methyl alcohol and water have been dissolved each other extracting operation, then passes into low-pressure nitrogen and carry out air lift.
Described separator pressure maintains 0.03 ~ 0.05MPag.
Beneficial effect of the present invention is: the present invention with the principle of different material different solubility in same solvent and Henry's law for theoretical foundation, by extracting methyl alcohol impure in existing rectisol system and air lift operation, methyl alcohol completely cannot be regenerated by system itself to regenerate further, and make it to meet need of production.Can up to 66.98% to the removal effect of the organic impurities such as fusel in methyl alcohol by this method, remove the methyl alcohol after organic impurities and can meet and recycle index request.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Wherein, 1, first flow control valve; 2, second adjustable valve; 3, the 3rd flow control valve; 4, pressure-regulating valve; 5, Liquid level adjusting valve; 6, separator.
Detailed description of the invention
Described in detail below in conjunction with the embodiment of accompanying drawing to this method.
As shown in Figure 1, methanol solution from existing rectisol system enters separator 6 by first flow control valve 1, simultaneously for the boiler water that extracts by second adjustable valve 2, enter separator for the nitrogen of air lift by the 3rd flow control valve 3, the gas being entrained with impurity in methyl alcohol after air lift delivers to flare system as waste gas by pressure-regulating valve 4, and moisture methanol solution is sent existing rectisol system back to carry out dehydrating operations by Liquid level adjusting valve 5 is counter.
Concrete operation method is:
According to low temperature washing device for methanol actual production capacity, open first flow control valve 1, the insufficient methanol solution of regeneration is delivered to separator 6, open second adjustable valve 2 according to methanol solution actual flow simultaneously, control boiler water flow is 1.5 times of methanol solution flow, control separator 6 liquid level by Liquid level adjusting valve 5 and maintain methanol solution and the time of staying of boiler water in knockout drum more than 1 hour, then open the 3rd flow control valve 3 to introduce 0.4MPag nitrogen and carry out air lift operation, control separator pressure by pressure-regulating valve 4 and maintain 0.05MPag, and by pressure-regulating valve 4, the impure waste gas after air lift is entered flare system.
Although invention has been described by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make a lot of form, these all belong within protection scope of the present invention.
Claims (4)
1. the method for impurity in efficient removal rectisol system washing methyl alcohol, it is characterized in that, existing system is regenerated underproof methyl alcohol and deliver to separator, boiler water is added in separator, the solubility of methyl alcohol in water is utilized to carry out extracting operation much larger than the principle of other organic impurities solubility in water, the nitrogen that pressure is 0.3 ~ 0.4MPag is passed into again in separator, Henry's law is utilized to complete air lift operation, the waste gas carrying organic impurities secretly enters flare system by pressure-regulating valve, the methanol aqueous solution of separator bottom is sent rectisol system back to and is carried out methanol dehydration operation, bear again the methyl alcohol that meets need of production for the production of, realize the recycling of methyl alcohol.
2. efficient removal rectisol system according to claim 1 washs the method for impurity in methyl alcohol, and it is characterized in that, described methanol solution mixes with the ratio of boiler water according to mass ratio 1:1.5.
3. efficient removal rectisol system according to claim 1 washs the method for impurity in methyl alcohol, it is characterized in that, described methanol solution and boiler water leave standstill more than 1 hour in the separator, methyl alcohol and water have been dissolved each other extracting operation, and then passing into pressure is that the nitrogen of 0.3 ~ 0.4MPag carries out air lift.
4. efficient removal rectisol system according to claim 1 washs the method for impurity in methyl alcohol, and it is characterized in that, described separator pressure maintains 0.03 ~ 0.05MPag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510874505.5A CN105344211A (en) | 2015-12-02 | 2015-12-02 | Method for efficiently removing impurities in methanol washed in low-temperature methanol washing system |
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| CN201510874505.5A CN105344211A (en) | 2015-12-02 | 2015-12-02 | Method for efficiently removing impurities in methanol washed in low-temperature methanol washing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106047422A (en) * | 2016-07-06 | 2016-10-26 | 山西潞安煤基合成油有限公司 | Naphthalene removing process for low-temperature methanol cleaning on raw gas |
| CN111321017A (en) * | 2018-12-14 | 2020-06-23 | 乔治洛德方法研究和开发液化空气有限公司 | Method and apparatus for regenerating loaded scrubbing medium from gas scrubbing |
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| CN104208983A (en) * | 2014-09-09 | 2014-12-17 | 中科合成油技术有限公司 | Decarburization method of coal-based indirect liquefaction Fischer-Tropsch synthesis tail gas |
| CN104857817A (en) * | 2015-05-12 | 2015-08-26 | 湖北双环科技股份有限公司 | Low temperature methanol washing gas stripping regeneration methyl alcohol equipment and utilization method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040210090A1 (en) * | 2001-07-05 | 2004-10-21 | Catalytic Distillation Technologies | Process and apparatus for catalytic distillations |
| WO2010132551A3 (en) * | 2009-05-13 | 2011-02-03 | Greatpoint Energy, Inc. | Processes for hydromethanation of a carbonaceous feedstock |
| CN102078742A (en) * | 2010-11-26 | 2011-06-01 | 大连理工大学 | Low-temperature methanol washing method for low-pressure raw gas |
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| CN106047422A (en) * | 2016-07-06 | 2016-10-26 | 山西潞安煤基合成油有限公司 | Naphthalene removing process for low-temperature methanol cleaning on raw gas |
| CN111321017A (en) * | 2018-12-14 | 2020-06-23 | 乔治洛德方法研究和开发液化空气有限公司 | Method and apparatus for regenerating loaded scrubbing medium from gas scrubbing |
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