CN113528236A - Method for removing colloid in hogwash oil - Google Patents
Method for removing colloid in hogwash oil Download PDFInfo
- Publication number
- CN113528236A CN113528236A CN202110729809.8A CN202110729809A CN113528236A CN 113528236 A CN113528236 A CN 113528236A CN 202110729809 A CN202110729809 A CN 202110729809A CN 113528236 A CN113528236 A CN 113528236A
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- Prior art keywords
- colloid
- hogwash oil
- hogwash
- oil
- grease
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Classifications
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/001—Refining fats or fatty oils by a combination of two or more of the means hereafter
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/02—Refining fats or fatty oils by chemical reaction
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/10—Refining fats or fatty oils by adsorption
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/16—Refining fats or fatty oils by mechanical means
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Microbiology (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to the technical field of biodiesel production, in particular to a method for removing colloid in hogwash oil. Compared with the prior art, the invention uses the low-concentration inorganic compound aqueous solution prepared by aluminum sulfate, ferrous sulfate, ferric chloride, aluminum chloride, sodium hydroxide and the like to increase the degree of colloid flocculation, can remove most of the colloid in the hogwash oil, ensures that the coking rate of the treated hogwash oil is very low, is suitable for subsequent processing and use, prolongs the service life of the hydrogenation catalyst to a great extent, and saves the operation cost of enterprises; the flocculant has low material consumption and low cost, the components have good solubility in water, and are easy to remove in the water washing process, so that the secondary pollution of grease is avoided; can be continuously used in industrial devices and has large processing capacity.
Description
Technical Field
The invention relates to the technical field of biodiesel production, in particular to a method for removing colloid in hogwash oil.
Background
The hogwash oil is waste oil collected by an oil separator in a sewer of the catering industry and then treated by the procedures of manual oil-water separation, filtration, deodorization and the like. The oil is heated at high temperature and slowly rancid after long-term storage, and various impurities caused by food materials and seasonings are mixed in the cooking process, wherein the impurities comprise mechanical impurities, inorganic salt, colloid, pigment, saponifiable matter, water and the like. The hogwash oil contains toxic and harmful substances, can not be eaten, but can be processed into organic fuel oil, and is an ideal raw material for producing biodiesel.
The first-generation biodiesel refers to fatty acid methyl ester obtained by performing ester exchange on waste animal and vegetable oil and methanol under the catalysis of acid or alkali, and the second-generation biodiesel refers to saturated alkane obtained by reacting the waste animal and vegetable oil with hydrogen under the actions of hydrofining and a hydroisomerization catalyst. Compared with the first-generation biodiesel, the second-generation biodiesel has the advantages of good oxidation stability, long storage period, high cetane number, high combustion heat value, low condensation point, capability of being blended into petroleum diesel in any proportion and the like. However, the hydrorefining and hydroisomerization catalysts have high requirements on the quality of raw oil, and if the waste animal and vegetable oil which is not subjected to refining treatment directly contacts the catalysts at high temperature, the catalysts are easily coked and poisoned by metals, so that the catalysts are quickly deactivated, and the long-period operation of industrial devices is influenced.
The hogwash oil contains a large amount of impurities, especially colloids, which easily cause catalyst deactivation, and the hogwash oil is easily coked at high temperature to cause rapid catalyst deactivation. The colloid in the hogwash oil mainly comprises phospholipid, protein, saccharide, mucilage and the like, wherein the content of the phospholipid accounts for the largest proportion, the colloid is usually removed and is also called as phospholipid removal, and the protein and the saccharide are often removed together in the phospholipid removal process. In a grease factory, colloids in crude oil are usually removed by using methods such as hydration, acidification, centrifugal separation, filtration and the like, but when hogwash oil is treated, the colloids are difficult to remove by using conventional methods such as hydration, acidification and the like due to complex physical and chemical changes in cooking and storage processes, and the degumming methods mainly have the following problems: (1) the hogwash oil after long-term storage and deterioration has more complex impurities and general degumming effect by adopting methods such as hydration, acidification and the like; (2) the degumming agent such as phosphoric acid, citric acid and the like is used, the addition amount is larger, even secondary pollution of grease is caused, and the production and operation cost is higher; (3) the wastewater generated in the process has high treatment difficulty and poor selectivity to impurities. Therefore, a new method needs to be found, and the invention is a method specially aiming at the degumming of the hogwash oil.
Disclosure of Invention
Aiming at the defects of the background technology, the invention provides a method for removing colloid in hogwash oil.
The technical scheme adopted by the invention is as follows: the method for removing the colloid in the hogwash oil is characterized by comprising the following steps:
s1, adding a flocculant solution with the mass concentration of 1-20% into hogwash oil, fully and uniformly mixing, keeping the temperature at 40-60 ℃ for 2-40 min, washing the mixture, taking an upper oil sample, centrifugally separating the upper oil sample to remove impurities, and separating to obtain grease;
s2, dehydrating the separated grease at the constant temperature of 100-110 ℃ for 0.5-2 h;
s3, adsorbing the dehydrated grease in an adsorption device at the adsorption temperature of 110-120 ℃.
Preferably, the addition amount of the flocculant solution in the S1 is 0.05-5.0% of the weight of the hogwash oil.
Preferably, the S1 is washed by desalted water for 2-3 times, and the addition amount of the desalted water is 2-20% of the weight of the hogwash oil.
Preferably, the centrifugal separation conditions in S1 are that the rotating speed is 500-.
Preferably, the flocculant solution is an inorganic salt water solution.
Preferably, the inorganic salt water solution comprises one or more inorganic salts of aluminum sulfate, ferrous sulfate, ferric chloride, aluminum chloride and sodium hydroxide.
Preferably, the adsorption apparatus in S3 is an adsorption column packed with an adsorbent.
Preferably, the adsorbent is one or a mixture of more of activated clay, activated carbon, attapulgite, silica gel and silicate.
Preferably, the particle size of the adsorbent is 20-60 meshes.
Compared with the prior art, the method and the process for removing the colloid in the hogwash oil have the beneficial effects that:
1. the low-concentration flocculating agent prepared from inorganic compounds such as aluminum sulfate, ferrous sulfate, ferric chloride, aluminum chloride, sodium hydroxide and the like is used, the colloid flocculation degree is increased, most of colloid in the hogwash oil can be removed, the coking rate of the treated hogwash oil is very low, the treated hogwash oil is suitable for subsequent processing and use, the service life of a hydrogenation catalyst is prolonged to a great extent, and the operation cost of an enterprise is saved;
2. the flocculant has low material consumption and low cost, the components have good solubility in water, and are easy to remove in the water washing process, so that the secondary pollution of grease is avoided;
3. can be continuously used in industrial devices and has large processing capacity.
Detailed Description
The present invention will be described in detail with reference to specific embodiments in order to make those skilled in the art better understand the technical solutions of the present invention.
Example 1
Putting 200g of hogwash oil into a reactor, adding a sodium hydroxide solution with the mass concentration of 5%, wherein the adding amount of the sodium hydroxide solution is 0.4% of the weight of the grease, fully and uniformly stirring, keeping the temperature in a water bath at 60 ℃ for 10min, then adding deionized water for washing twice, wherein the single adding amount of the deionized water is 0.05% of the weight of the hogwash oil, taking out an upper oil sample, putting the oil sample into a centrifuge with the rotating speed of 2000r/min for centrifugal separation for 5min, taking out the upper oil sample, and putting the upper oil sample into a drying oven with the temperature of 103 ℃ for dehydration for 1h for later use; filling a proper amount of absorbent cotton in a narrow outlet at the middle lower part of the spherical pipe, filling 15g of purchased 60-mesh activated clay, and putting the whole body into a 110 ℃ oven for standby at constant temperature; and taking out the dehydrated grease and the filtering device from the thermostat, filtering while the grease is hot, and cooling the filtered grease to room temperature to obtain clear, transparent and light yellow refined hogwash oil.
Example 2
Putting 200g of hogwash oil into a reactor, adding an aluminum sulfate solution with the mass concentration of 1%, wherein the adding amount of the aluminum sulfate solution is 5% of the weight of grease, fully and uniformly stirring, keeping the temperature in a water bath at 40 ℃ for 10min, then adding deionized water for washing twice, wherein the single adding amount of the deionized water is 5% of the weight of the hogwash oil, taking out an upper oil sample, putting the oil sample into a centrifuge with the rotation speed of 500r/min for centrifugal separation for 10min, taking out the upper oil sample, and putting the upper oil sample into a 100 ℃ oven for dehydration for 0.5h for later use; filling a proper amount of absorbent cotton in a narrow outlet at the middle lower part of the spherical pipe, filling 15g of purchased 60-mesh activated clay, and putting the whole body into a 120 ℃ oven for standby at constant temperature; and taking out the dehydrated grease and the filtering device from the thermostat, filtering while the grease is hot, and cooling the filtered grease to room temperature to obtain clear, transparent and light yellow refined hogwash oil.
Example 3
Putting 200g of hogwash oil into a reactor, adding 10% by mass of ferric chloride solution, wherein the addition amount of the ferric chloride solution is 0.05% of the weight of the grease, fully and uniformly stirring, keeping the temperature in a 50 ℃ water bath for 10min, then adding deionized water for washing for three times, wherein the single addition amount of the deionized water is 15% of the weight of the hogwash oil, taking out an upper oil sample, putting the oil sample into a centrifugal machine with the rotation speed of 4000r/min for centrifugal separation for 5min, taking out the upper oil sample, and putting the upper oil sample into a 110 ℃ drying oven for dehydration for 2h for later use; filling a proper amount of absorbent cotton in a narrow outlet at the middle lower part of the spherical pipe, filling 15g of purchased 60-mesh activated clay, and putting the whole body into a 110 ℃ oven for standby at constant temperature; and taking out the dehydrated grease and the filtering device from the thermostat, filtering while the grease is hot, and cooling the filtered grease to room temperature to obtain clear, transparent and light yellow refined hogwash oil.
Example 4
Putting 200g of hogwash oil into a reactor, adding 20% of aluminum chloride solution by mass concentration, wherein the adding amount of the aluminum chloride solution is 5% of the weight of the grease, fully and uniformly stirring, keeping the temperature in a 60 ℃ water bath for 40min, then adding deionized water for washing for three times, wherein the single adding amount of the deionized water is 25% of the weight of the hogwash oil, taking out an upper oil sample, putting the oil sample into a centrifuge with the rotating speed of 3000r/min for centrifugal separation for 10min, taking out the upper oil sample, and putting the upper oil sample into a 110 ℃ drying oven for dehydration for 2h for later use; filling a proper amount of absorbent cotton in a narrow outlet at the middle lower part of the spherical pipe, filling 15g of purchased 60-mesh activated clay, and putting the whole body into a 110 ℃ oven for standby at constant temperature; and taking out the dehydrated grease and the filtering device from the thermostat, filtering while the grease is hot, and cooling the filtered grease to room temperature to obtain clear, transparent and light yellow refined hogwash oil.
Comparative example 1
The same as example 1, except that a citric acid solution with a mass concentration of 5% is added to the hogwash oil.
The refined oils and fats obtained in examples 1 to 4 and comparative example 1 were subjected to an oil index evaluation test, and the test results are shown in the following table:
and (3) measuring the content of phospholipid: the method is carried out according to a molybdenum blue colorimetric method shown in GB/T5537-2008 'determination of phospholipid content in grain and oil'.
High-temperature coking evaluation experiment: accurately weighing 100-200 g of grease in a three-necked flask, inserting a thermometer, an electric stirrer and a water condensation tube into the mouth of the flask, heating the round-bottomed flask by using an electric heating furnace, slowly heating to 250-320 ℃ at a fixed stirring speed, keeping the temperature for 0.5-2h, standing and cooling to 50-60 ℃ after the constant temperature is finished, carrying out suction filtration on an oil sample by using medium-speed filter paper (with the aperture of 30-50 microns), drying the filter paper and the cokes in a 110-120 ℃ drying oven for 0.5-2h, cooling to room temperature, weighing, and calculating the mass fraction of the cokes according to the weight of the cokes on the filter paper and the total weight of the grease.
As can be seen from the above table, most of the coked substances in the hogwash oil can be completely removed, the obtained hogwash oil is light in color and suitable for subsequent processing, and compared with the method adopting citric acid for treatment in comparative example 1, the content of phospholipid in the oil is obviously reduced.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (9)
1. A method for removing colloid in hogwash oil is characterized by comprising the following steps:
s1, adding a flocculant solution with the mass concentration of 1-20% into hogwash oil, fully and uniformly mixing, keeping the temperature at 40-60 ℃ for 2-40 min, washing the mixture, taking an upper oil sample, centrifugally separating the upper oil sample to remove impurities, and separating to obtain grease;
s2, dehydrating the separated grease at the constant temperature of 100-110 ℃ for 0.5-2 h;
s3, adsorbing the dehydrated grease in an adsorption device at the adsorption temperature of 110-120 ℃.
2. The method for removing the colloid from the hogwash oil according to claim 1, wherein the amount of the flocculant solution added in the S1 is 0.05-5.0% by weight of the hogwash oil.
3. The method according to claim 1, wherein the S1 is washed with desalted water for 2-3 times, and the amount of desalted water added is 2-20% of the weight of the hogwash oil.
4. The method according to claim 1, wherein the centrifugation in S1 is performed at 500-4000r/min for 5-10 min.
5. The method for removing the colloid from the hogwash oil according to any one of claims 1-4, wherein: the flocculant solution is an inorganic salt water solution.
6. The method for removing the colloid from the hogwash oil according to claim 5, wherein the method comprises the following steps: the inorganic salt water solution comprises one or more inorganic salts of aluminum sulfate, ferrous sulfate, ferric chloride, aluminum chloride and sodium hydroxide.
7. The method for removing the colloid from the hogwash oil according to claim 1, wherein the method comprises the following steps: the adsorption device in S3 is an adsorption tower filled with an adsorbent.
8. The method for removing the colloid from the hogwash oil according to claim 6, wherein the method comprises the following steps: the adsorbent is one or a mixture of more of activated clay, activated carbon, attapulgite, silica gel and silicate.
9. The method for removing the colloid from the hogwash oil according to claim 6, wherein the method comprises the following steps: the particle size of the adsorbent is 20-60 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110729809.8A CN113528236A (en) | 2021-06-29 | 2021-06-29 | Method for removing colloid in hogwash oil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110729809.8A CN113528236A (en) | 2021-06-29 | 2021-06-29 | Method for removing colloid in hogwash oil |
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| CN202110729809.8A Pending CN113528236A (en) | 2021-06-29 | 2021-06-29 | Method for removing colloid in hogwash oil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115161109A (en) * | 2022-07-18 | 2022-10-11 | 湖北碧美新能源科技有限公司 | Preparation method of industrial-grade mixed oil |
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