CN111214852B - Biodegradable defoaming agent and preparation method thereof - Google Patents
Biodegradable defoaming agent and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0495—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance containing hetero rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H1/00—Processes for the preparation of sugar derivatives
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H15/00—Compounds containing hydrocarbon or substituted hydrocarbon radicals directly attached to hetero atoms of saccharide radicals
- C07H15/02—Acyclic radicals, not substituted by cyclic structures
- C07H15/04—Acyclic radicals, not substituted by cyclic structures attached to an oxygen atom of the saccharide radical
- C07H15/08—Polyoxyalkylene derivatives
Abstract
The invention relates to a biodegradable defoaming agent and a preparation method thereof, and solves the technical problems that the defoaming agent in the prior art is low and unstable in defoaming efficiency, cannot be biodegraded, is easy to produce salt scale pollution and is narrow in use field. The invention provides a biodegradable defoaming agent, which is sophorolipid polyoxyethylene ether and has a molecular formula of RO (CH)2CH2O)nH, wherein n is more than or equal to 6 and less than or equal to 8, and R is lactone sophorolipid or/and acid sophorolipid; also provides a preparation method thereof. The invention is widely applied to the technical field of research and development and application of the defoaming agent.
Description
Technical Field
The invention relates to the technical field of research and development and application of defoaming agents, in particular to a biodegradable defoaming agent and a preparation method thereof.
Background
The defoaming agent is an additive for eliminating foam. In the production and application processes of the fields of coating, textile, medicine, fermentation, papermaking, water treatment, petrochemical industry and the like, a large amount of foam can be generated, and the product quality and the production process are further influenced. Based on the inhibition and elimination of foam, a specific amount of an antifoaming agent is usually added to the foam during production.
According to the development history of the antifoaming agent, the antifoaming agent can be classified into the following categories: 1. mineral oils, amides, lower alcohols, fatty acids and fatty acid esters, phosphate esters antifoams: the raw materials are easy to obtain, but the defoaming efficiency is low, the raw materials cannot be biodegraded, the specificity is strong, and the use conditions are harsh; 2. polyether defoaming agent: the foam inhibition capability is strong, but the defoaming capability is poor, the application field is narrow, the foam breaking efficiency is low, and the degradation period is long; 3. silicone defoaming agent: the defoaming spectrum is strong, but silicon spots and shrinkage cavities are easy to generate by using an organic silicon defoamer, for example, in an evaporator system, the evaporator system is easy to cause silicon oil pollution or silicate scale pollution; the different classes of antifoam agents mentioned above all have the advantage of being irreplaceable per se, but also have the disadvantage of being unmortisable. Now with the enhancement of enterprise safety and environmental protection consciousness, a biodegradable is researched and developed, and meanwhile, a defoaming agent with strong defoaming and foam inhibiting capabilities is very important, so that the biodegradable foam-inhibiting defoaming agent also has a great market prospect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a biodegradable defoamer which has good biodegradability, obviously improved defoaming and foam inhibiting performance, high yield, environmental protection, energy conservation, no environmental pollution, difficult dirt generation and wide application range and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problem is as follows: the invention provides a biodegradable defoaming agent, which is sophorolipid polyoxyethylene ether with a molecular formula of RO (CH)2CH2O)nH, wherein n is more than or equal to 6 and less than or equal to 8, and R is sophorolipid.
Preferably, R is lactone type sophorolipid or/and acid type sophorolipid.
The preparation method of the biodegradable defoaming agent comprises the following steps:
adding sophorolipid, water and ethylene oxide into an autoclave under the condition of an alkaline catalyst, and pressurizing at 140-160 ℃ to perform ring-opening polymerization reaction to generate sophorolipid polyoxyethylene ether, wherein the reaction equation is as follows:
ROH+nC2H4O→RO(CH2CH2O)nh, wherein n is more than or equal to 6 and less than or equal to 8, and R is sophorolipid.
Preferably, the specific reaction operation steps are as follows: adding water, an alkaline catalyst and sophorolipid into a high-pressure kettle, charging a certain amount of ethylene oxide, pressurizing, sealing, stirring at 140-160 ℃ for reaction, carrying out ring-opening polymerization reaction, and neutralizing the residual alkaline catalyst after the reaction is finished to obtain a light yellow viscous flowing product sophorolipid polyoxyethylene ether.
Preferably, the alkaline catalyst is sodium hydroxide or potassium hydroxide, and the mass ratio of the alkaline catalyst to the sophorolipid is 0.2-0.3: 100.
Preferably, the mass ratio of the added water to the added sophorolipid is 24-31: 50.
Preferably, the mole ratio of the added sophorolipid to the added ethylene oxide is 1: n, and n is more than or equal to 6 and less than or equal to 8.
Preferably, the specific steps of neutralizing the remaining basic catalyst are: and (3) cooling the reaction product in the autoclave to 25-35 ℃, and then adding hydrochloric acid to neutralize the residual alkaline catalyst.
Preferably, the ethylene oxide is introduced as follows: firstly, introducing nitrogen into an autoclave, completely replacing air in the autoclave, then introducing a certain amount of ethylene oxide, and then introducing nitrogen until the pressure in the autoclave is 0.4-0.6 MPa.
Preferably, the reaction time is 2-5 h under sealed stirring.
The invention has the beneficial effects that:
(1) according to the biodegradable defoaming agent and the preparation method thereof, the sophorolipid is subjected to ring-opening epoxidation reaction by adopting ethylene oxide, so that the product defoaming agent has the characteristics of sophorolipid biodegradability, good emulsification and dispersion, surface tension reduction, temperature resistance and high salt resistance, and also has the characteristic of high foam inhibition capability of polyether defoaming agents.
In addition, the main body of the biodegradable antifoaming agent adopts sophorolipid, which is a glycolipid biosurfactant and is a microbial secondary metabolite produced by candida by a fermentation process under certain conditions by taking sugar, vegetable oil and the like as carbon sources. The surfactant has the general performances of solubilization, emulsification, wetting, foaming, dispersion, surface tension reduction and the like of the conventional surfactant, and also has the characteristics of no toxicity, 100% biodegradability, temperature resistance, high salt resistance, wide pH range adaptation, environmental friendliness and the like.
Moreover, after modification, the biodegradability, defoaming performance and foam inhibition performance of the biodegradable defoaming agent are obviously higher than those of unmodified sophorolipid and the defoaming performance and foam inhibition performance of the existing defoaming agent; the defoaming and foam inhibiting performance of the defoaming agent can be known according to the analysis of the chemical structure characteristics of the defoaming agent, salt scale and other pollutants of a reaction device can not be generated, and the defoaming agent is a universal defoaming agent and has a wide application range.
(2) The biodegradable defoaming agent and the preparation method thereof have the advantages of low manufacturing cost, high yield and no loss, the generated product can be directly used without post-treatment, the environmental protection and energy saving are realized, the environment is not polluted, the biodegradation performance, the defoaming performance and the foam inhibiting performance are obviously improved, and the environment-friendly and energy-saving concept pursued at present is met.
Detailed Description
The present invention will be further described with reference to specific examples to assist understanding of the invention. The method used in the invention is a conventional production method if no special provisions are made; the starting materials used are, unless otherwise specified, conventional commercial products.
A biodegradable defoaming agent is sophorolipid polyoxyethylene ether with a molecular formula of RO (CH)2CH2O)nH, wherein n is more than or equal to 6 and less than or equal to 8, and R is lactone sophorolipid or/and acid sophorolipid.
Example 1
A method of preparing a biodegradable defoamer comprising the steps of:
(1) feeding: adding water, an alkaline catalyst sodium hydroxide and sophorolipid into a high-pressure autoclave, wherein the mass ratio of the added water to the added sophorolipid is 24:50, and the mass ratio of the added alkaline catalyst sodium hydroxide to the added sophorolipid is 0.2: 100; introducing nitrogen into a high-pressure kettle, replacing air in the high-pressure kettle, repeating the replacement operation for 3 times until the air is completely replaced, introducing a certain amount of ethylene oxide, wherein the molar ratio of the ethylene oxide to the sophorolipid is 6:1, introducing nitrogen until the pressure in the kettle is 0.4MPa, and sealing the high-pressure kettle;
(2) heating and reacting: stirring and reacting in an autoclave at 140 ℃ for 2 hours, carrying out ring-opening polymerization reaction between sophorolipid and ethylene oxide, and neutralizing residual alkaline catalyst sodium hydroxide after the reaction is finished: cooling the reaction product in the autoclave to 25 ℃, adding hydrochloric acid to neutralize the residual alkaline catalyst to obtain a light yellow viscous flow product sophorolipid polyoxyethylene ether;
the specific reaction equation is as follows:
ROH+6C2H4O→RO(CH2CH2O)6h and R are lactone sophorolipid or/and acid sophorolipid.
Example 2
A method of preparing a biodegradable defoamer comprising the steps of:
(1) feeding: adding water, an alkaline catalyst potassium hydroxide and sophorolipid into a high-pressure autoclave, wherein the mass ratio of the added alkaline catalyst potassium hydroxide to the added sophorolipid is 0.3:100, and the mass ratio of the added water to the added sophorolipid is 31: 50; introducing nitrogen into a high-pressure kettle, replacing air in the high-pressure kettle, repeating the replacement operation for 3 times until the air is completely replaced, introducing a certain amount of ethylene oxide, wherein the molar ratio of the ethylene oxide to the sophorolipid is 8:1, introducing nitrogen until the pressure in the kettle is 0.6MPa, and sealing the high-pressure kettle;
(2) heating and reacting: stirring and reacting in an autoclave at 160 ℃ for 5 hours, carrying out ring-opening polymerization reaction between sophorolipid and ethylene oxide, and neutralizing residual alkaline catalyst potassium hydroxide after the reaction is finished: cooling the reaction product in the high-pressure kettle to 35 ℃, adding hydrochloric acid to neutralize the residual alkaline catalyst to obtain a light yellow viscous flow product sophorolipid polyoxyethylene ether;
the specific reaction equation is as follows:
ROH+8C2H4O→RO(CH2CH2O)8h and R are lactone sophorolipid or/and acid sophorolipid.
Example 3
A method of preparing a biodegradable defoamer comprising the steps of:
(1) feeding: adding water, an alkaline catalyst sodium hydroxide and sophorolipid into an autoclave, wherein the mass ratio of the alkaline catalyst sodium hydroxide to the sophorolipid is 0.25:100, and the mass ratio of the water to the sophorolipid is 27: 50; introducing nitrogen into a high-pressure kettle, replacing air in the high-pressure kettle, repeating the replacement operation for 3 times until the air is completely replaced, introducing a certain amount of ethylene oxide, wherein the molar ratio of the ethylene oxide to the sophorolipid is 7:1, introducing nitrogen until the pressure in the kettle is 0.5MPa, and sealing the high-pressure kettle;
(2) heating and reacting: stirring and reacting in an autoclave at the temperature of 150 ℃ for 3h, carrying out ring-opening polymerization reaction between sophorolipid and ethylene oxide, and neutralizing the residual alkaline catalyst sodium hydroxide after the reaction is finished: cooling the reaction product in the high-pressure kettle to 30 ℃, adding hydrochloric acid to neutralize the residual alkaline catalyst sodium hydroxide to obtain a light yellow viscous flow product sophorolipid polyoxyethylene ether;
the specific reaction equation is as follows:
ROH+7C2H4O→RO(CH2CH2O)7h and R are lactone type sophorolipid or/and acid type sophorolipid.
Example 4
A method of preparing a biodegradable defoamer comprising the steps of:
(1) feeding: adding water, alkaline catalyst sodium hydroxide and sophorolipid into a high-pressure autoclave, wherein the mass ratio of the added water to the added sophorolipid is 25:50, and the mass ratio of the added alkaline catalyst sodium hydroxide to the added sophorolipid is 0.25: 100; introducing nitrogen into an autoclave, replacing air in the autoclave, repeating the replacement operation for 3 times until the air is completely replaced, introducing a certain amount of ethylene oxide, wherein the molar ratio of the addition amount of the ethylene oxide to the addition amount of the sophorolipid is 7:1, introducing nitrogen until the pressure in the autoclave is 0.5MPa, and sealing the autoclave;
(2) heating and reacting: stirring and reacting in an autoclave at 160 ℃ for 5h, carrying out ring-opening polymerization reaction between sophorolipid and ethylene oxide, and neutralizing the residual alkaline catalyst sodium hydroxide after the reaction is finished: cooling the reaction product in the high-pressure kettle to 35 ℃, adding hydrochloric acid to neutralize the residual alkaline catalyst to obtain a light yellow viscous flow product sophorolipid polyoxyethylene ether;
the specific reaction equation is as follows:
ROH+7C2H4O→RO(CH2CH2O)8h and R are lactone sophorolipid or/and acid sophorolipid.
Example 5
A method of preparing a biodegradable defoamer comprising the steps of:
(1) feeding: adding water, an alkaline catalyst potassium hydroxide and sophorolipid into a high-pressure kettle, wherein the mass ratio of the alkaline catalyst potassium hydroxide to the sophorolipid is 0.25: 100; the mass ratio of the added water to the added sophorolipid is 29: 50; introducing nitrogen into an autoclave, replacing air in the autoclave, repeating the replacement operation for 3 times until the air is completely replaced, and introducing a certain amount of ethylene oxide, wherein the molar ratio of the added amount of the ethylene oxide to the added amount of the sophorolipid is 6: 1; then nitrogen is filled until the pressure in the autoclave is 0.55MPa, and the autoclave is sealed;
(2) heating and reacting: stirring and reacting in an autoclave at 150 ℃ for 4 hours, carrying out ring-opening polymerization reaction between sophorolipid and ethylene oxide, and neutralizing residual alkaline catalyst potassium hydroxide after the reaction is finished: cooling the reaction product in the high-pressure kettle to 30 ℃, adding hydrochloric acid to neutralize the residual alkaline catalyst to obtain a light yellow viscous flow product sophorolipid polyoxyethylene ether;
the specific reaction equation is as follows:
ROH+6C2H4O→RO(CH2CH2O)6h and R are lactone type sophorolipid or/and acid type sophorolipid.
Example 6
A method of preparing a biodegradable defoamer comprising the steps of:
(1) feeding: adding water, alkaline catalyst sodium hydroxide and sophorolipid into a high-pressure autoclave, wherein the mass ratio of the alkaline catalyst sodium hydroxide to the sophorolipid is 0.25:100, and the mass ratio of the water to the sophorolipid is 27: 50; introducing nitrogen into a high-pressure kettle, replacing air in the high-pressure kettle, repeating the replacement operation for 3 times until the air is completely replaced, introducing a certain amount of ethylene oxide, wherein the molar ratio of the ethylene oxide to the sophorolipid is 1:1, introducing nitrogen until the pressure in the kettle is 0.5MPa, and sealing the high-pressure kettle;
(2) heating and reacting: stirring and reacting in an autoclave at 150 ℃ for 3 hours, carrying out ring-opening polymerization reaction between sophorolipid and ethylene oxide, and neutralizing residual alkaline catalyst sodium hydroxide after the reaction is finished: cooling the reaction product in the high-pressure kettle to 30 ℃, adding hydrochloric acid to neutralize the residual alkaline catalyst, and obtaining a light yellow liquid product, namely sophorolipid polyoxyethylene ether;
the specific reaction equation is as follows:
ROH+C2H4O→RO(CH2CH2o) H, R is lactone sophorolipid or/and acid sophorolipid.
Example 7
A method of preparing a biodegradable defoamer comprising the steps of:
(1) feeding: adding water, alkaline catalyst sodium hydroxide and sophorolipid into a high-pressure autoclave, wherein the mass ratio of the alkaline catalyst sodium hydroxide to the sophorolipid is 0.25:100, and the mass ratio of the water to the sophorolipid is 27: 50; introducing nitrogen into an autoclave, replacing air in the autoclave, repeating the replacement operation for 3 times until the air is completely replaced, introducing a certain amount of ethylene oxide, wherein the molar ratio of the addition amount of the ethylene oxide to the addition amount of the sophorolipid is 3:1, introducing nitrogen until the pressure in the autoclave is 0.5MPa, and sealing the autoclave;
(2) heating and reacting: stirring and reacting in an autoclave at 150 ℃ for 3 hours, carrying out ring-opening polymerization reaction between sophorolipid and ethylene oxide, and neutralizing residual alkaline catalyst sodium hydroxide after the reaction is finished: cooling the reaction product in the autoclave to 30 ℃, adding hydrochloric acid to neutralize the residual alkaline catalyst to obtain a light yellow liquid product, namely sophorolipid polyoxyethylene ether;
the specific reaction equation is as follows:
ROH+3C2H4O→RO(CH2CH2O)3h and R are lactone sophorolipid or/and acid sophorolipid.
The performance of the biodegradable antifoaming agent of the present invention is further illustrated by the following report of experimental results.
(1) Detecting items:
the biodegradable defoamer prepared by the invention is tested for biodegradability and defoaming and foam inhibiting performance.
(2) And (3) testing a sample:
the biodegradability test results of the sophorolipid polyoxyethylene ether, sophorolipid, polyether defoamer, silicone defoamer and polyether modified siloxane defoamer prepared in examples 1 to 7 are shown in table 1, and the defoaming and foam suppressing performance test results are shown in table 2.
1. Biodegradability test
1.1 Experimental methods
Experimental agents: the biodegradable antifoaming agents prepared in examples 1 to 7, i.e., sophorolipid polyoxyethylene ether, sophorolipid, polyether antifoaming agents, silicone antifoaming agents, and polyether modified silicone antifoaming agents, were prepared as antifoaming agent samples;
the instrument comprises the following steps: freezing the shaking table at constant temperature; an ultraviolet courseware spectrophotometer;
the method comprises the following steps: reference is made to GB/T15818-2006 Shake flask test method;
the experiment adopts biological mud of a Weihai leather factory, and active sludge with certain mass concentration is prepared by filtering and aerating and is used as a biodegradable microorganism source for researching the biodegradation degree of the defoaming agent.
The specific operation process is as follows:
(1.1.1) preparation of culture solution: and (3) putting 500ml of nutrient solution into a 1L triangular flask, adding 15ml of 1g/L defoaming agent test solution, adding 5ml of 15g/L activated sludge solution, shaking uniformly, covering a cotton plug, and shaking in a constant-temperature shaking table at the specified temperature of 25 ℃ and at the speed of 200r/min for 72 hours.
(1.1.2) preparation of acclimatization solution: taking 500ml of nutrient solution, adding 15ml of defoaming agent solution in a 1L triangular flask, adding 5ml of culture solution prepared in the step (1.1.1), shaking uniformly, covering a cotton plug, and shaking in a constant-temperature shaking table at the specified temperature of 25 ℃ and at the constant temperature of 200r/min for 72h under the same condition.
(1.1.3) biodegradability test: and (3) putting 500ml of nutrient solution into a 1L triangular flask, adding 15ml of 1g/L test solution (the actual mass concentration is 30mg/L), adding 5ml of the domestication solution prepared in the step (1.1.2), placing in a shaking table, shaking for 5min, and detecting the concentration of the defoaming agent by adopting a national standard method, thereby obtaining the degradation degree.
1.2 results of the experiment
As shown in table 1:
TABLE 1 biodegradability test results of biodegradable antifoaming agent
From the results of the biodegradability test of the biodegradable antifoaming agent in table 1 above, it is seen that the sophorolipid polyoxyethylene ether prepared in experimental examples 1-5 of the present invention has good biodegradability, which is significantly better than the degradability of the antifoaming agents such as sophorolipid polyoxyethylene ether, polyether antifoaming agent, silicone antifoaming agent, polyether modified siloxane antifoaming agent, etc. prepared in experimental examples 6-7, and is slightly lower than the biodegradability of sophorolipid itself. Especially, compared with the biodegradation performance of the sophorolipid and the ethylene oxide in the reactions of the experimental examples 6 to 7, wherein the molar ratio of the sophorolipid to the ethylene oxide is 1:1 and 1:3, the sophorolipid polyoxyethylene ether prepared in the examples 1 to 5 has the optimal reaction parameters in the preparation process, when the molar ratio of the sophorolipid to the ethylene oxide in the reactions is 1: n, and n is more than or equal to 6 and less than or equal to 8, the prepared sophorolipid polyoxyethylene ether has the advantages of obviously improved biodegradability and optimal performance, and the biodegradation of the sophorolipid polyoxyethylene ether can be completely degraded in one month by using a microorganism source prepared from biological mud of a leather factory, so the biodegradable defoamer prepared by the invention can be widely used in a biochemical treatment process in an actual production process. In addition, in the results of the biodegradability test of the biodegradable antifoaming agent, the biodegradability of the sophorolipid polyoxyethylene ether prepared in experimental examples 1-5 of the present invention is similar to the biodegradability of sophorolipid which is not modified, and it is fully proved that the biodegradable antifoaming agent prepared in the present invention fully combines the excellent performances of water-soluble polyether and sophorolipid, and the biodegradability is significantly improved.
2. Defoaming and foam inhibiting performance experiment
2.1 Experimental methods
The method comprises the following steps: reference is made to GB/T26527-.
Experimental agents: the biodegradable defoaming agents, sophorolipid, polyether defoaming agents, silicone defoaming agents, and polyether modified siloxane defoaming agents prepared in examples 1 to 7 were prepared as defoaming agent samples;
2.2 results of the experiment
As shown in table 2:
TABLE 2 defoaming and foam suppressing performance test results of biodegradable defoamer
From the results of the defoaming and foam inhibiting performance experiments of the biodegradable defoamer in table 2 above, the defoaming and foam inhibiting effects of the sophorolipid polyoxyethylene ether products prepared in the experimental examples 1 to 5 are remarkably better than those of defoamers such as sophorolipid, polyether defoamers, silicone defoamers, polyether modified siloxane defoamers and the like, the foam inhibiting time is more than 100s, and the defoaming time is 1 to 3 s. Especially, compared with the biodegradation performance of the sophorolipid and the ethylene oxide in the reaction of experimental examples 6 to 7, wherein the molar ratio of the sophorolipid to the ethylene oxide is 1:1 and 1:3, the sophorolipid polyoxyethylene ether prepared in the experimental examples 1 to 5 has the advantages that the reaction parameters are optimal in the preparation process, and the foam inhibition time is more than 100s, namely when the molar ratio of the sophorolipid to the ethylene oxide is 1: n and n is more than or equal to 6 and less than or equal to 8, the prepared sophorolipid polyoxyethylene ether has the advantages of obviously improved foam inhibition and defoaming performance, and the performance is optimal, and the defoaming time reaches 1 to 3s, which is obviously superior to that of sophorolipid without modification.
The above are only examples of the present invention, for example, sophorolipid polyoxyethylene ether, which has the formula RO (CH)2CH2O)nH, wherein n is more than or equal to 6 and less than or equal to 8, and R is lactone type sophorolipid or/and acid type sophorolipid, can be used for realizing the biodegradable defoamer.
In conclusion, the biodegradable defoaming agent and the preparation method thereof have the advantages of low manufacturing cost, high yield and no loss, the generated product can be directly used without post-treatment, the environmental protection and energy conservation can be realized, the environment can not be polluted, and the biodegradation performance, the defoaming performance and the foam inhibiting performance are obviously improved. The preparation method adopts the ethylene oxide to carry out ring-opening epoxidation reaction on the sophorolipid, so that the product defoamer has the characteristics of sophorolipid biodegradability, good emulsification, dispersion, surface tension reduction, temperature resistance and high salt resistance, and also has the characteristic of strong foam inhibition capability of polyether defoamer, and meanwhile, the biodegradability, defoaming and foam inhibition performance of the defoamer is obviously higher than that of unmodified sophorolipid and the defoaming and foam inhibition performance of the existing defoamer; the defoaming and foam inhibiting performance of the defoaming agent can be known according to the analysis of the chemical structure characteristics of the defoaming agent, salt scale and other pollutants of a reaction device can not be generated, and the defoaming agent is a universal defoaming agent and has a wide application range.
However, the above description is only an example of the present invention, and the scope of the present invention should not be limited thereto, and all equivalent changes and modifications made according to the claims should be included in the scope of the present invention.
Claims (1)
1. A method for preparing biodegradable defoaming agent containing sophorolipid polyoxyethylene ether with molecular formula of RO (CH)2CH2O)7H and R are sophorolipid, and the method is characterized by comprising the following steps:
step (1): feeding, namely feeding water, an alkaline catalyst sodium hydroxide and sophorolipid into a high-pressure kettle, wherein the mass ratio of the alkaline catalyst sodium hydroxide to the sophorolipid is 0.25:100, and the mass ratio of the water to the sophorolipid is 27: 50; introducing nitrogen into an autoclave, replacing air in the autoclave, repeating the replacement operation for 3 times until the air is completely replaced, introducing ethylene oxide, wherein the molar ratio of the added ethylene oxide to the added sophorolipid is 7:1, introducing nitrogen until the pressure in the autoclave is 0.5MPa, and sealing the autoclave;
step (2): heating for reaction, stirring and reacting in a high-pressure kettle at 150 ℃ for 3h to generate ring-opening polymerization reaction between sophorolipid and ethylene oxide, and neutralizing residual alkaline catalyst sodium hydroxide after the reaction is finished: cooling the reaction product in the high-pressure kettle to 30 ℃, adding hydrochloric acid to neutralize the residual alkaline catalyst sodium hydroxide to obtain a light yellow viscous flow product sophorolipid polyoxyethylene ether; the specific reaction equation is as follows:
ROH+7C2H4O→RO(CH2CH2O)7H。
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| CN114958415B (en) * | 2021-02-22 | 2023-09-05 | 中国石油化工股份有限公司 | Application of sophorolipid ether, demetallizing agent composition, application of demetallizing agent composition and method for demetallizing clean tank oil |
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