CN113699544A - Method and device for promoting esterification reaction - Google Patents
Method and device for promoting esterification reaction Download PDFInfo
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- CN113699544A CN113699544A CN202111003446.6A CN202111003446A CN113699544A CN 113699544 A CN113699544 A CN 113699544A CN 202111003446 A CN202111003446 A CN 202111003446A CN 113699544 A CN113699544 A CN 113699544A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005886 esterification reaction Methods 0.000 title claims abstract description 27
- 230000001737 promoting effect Effects 0.000 title claims abstract description 16
- 150000001875 compounds Chemical class 0.000 claims abstract description 36
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 20
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 15
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 14
- 239000011259 mixed solution Substances 0.000 claims abstract description 14
- 238000005349 anion exchange Methods 0.000 claims abstract description 11
- -1 ester compound Chemical class 0.000 claims abstract description 11
- 230000032050 esterification Effects 0.000 claims abstract description 11
- 239000003054 catalyst Substances 0.000 claims abstract description 10
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 16
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 12
- 239000004310 lactic acid Substances 0.000 claims description 8
- 235000014655 lactic acid Nutrition 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 8
- 150000004706 metal oxides Chemical class 0.000 claims description 8
- 239000003011 anion exchange membrane Substances 0.000 claims description 7
- 239000003957 anion exchange resin Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 2
- 239000003729 cation exchange resin Substances 0.000 claims description 2
- 239000002105 nanoparticle Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 8
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 15
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- XXRCUYVCPSWGCC-UHFFFAOYSA-N Ethyl pyruvate Chemical compound CCOC(=O)C(C)=O XXRCUYVCPSWGCC-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229940116333 ethyl lactate Drugs 0.000 description 3
- 229940117360 ethyl pyruvate Drugs 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 2
- RJIBYWJFSNISEW-UHFFFAOYSA-N C(C1=CC=C(C(=O)O)C=C1)(=O)O.C(C(O)C)(=O)O Chemical compound C(C1=CC=C(C(=O)O)C=C1)(=O)O.C(C(O)C)(=O)O RJIBYWJFSNISEW-UHFFFAOYSA-N 0.000 description 2
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010701 ester synthesis reaction Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000728 polyester Chemical class 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229940107700 pyruvic acid Drugs 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/01—Products
- C25B3/07—Oxygen containing compounds
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/20—Processes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention particularly relates to a method and a device for promoting esterification reaction, belonging to the technical field of esterification reaction, wherein the method comprises the following steps: mixing a hydroxyl-containing compound and a carboxyl-containing compound to obtain a mixed solution; obtaining an electrolytic device comprising a cathode and an anode, the anode being provided with a compound having anion exchange capacity; electrolyzing the mixed solution by using the electrolysis device in the presence of an esterification catalyst to obtain an ester compound; the ester bond is synthesized by adopting an electrolysis mode, so that the ester bond synthesis can be carried out at normal temperature and normal pressure, the energy consumption for producing the ester compound is effectively reduced, and the method has remarkable economic benefit.
Description
Technical Field
The invention belongs to the technical field of esterification reaction, and particularly relates to a method and a device for promoting esterification reaction.
Background
Esters and polyester compounds are important chemical products and have wide application in production and life. However, in actual production, the synthesis reaction of ester bonds usually requires high-temperature and reduced-pressure conditions, and has certain requirements on the ratio of alcohols and carboxylic acid compounds as substrates, so that the cost of both economy and energy consumption is high.
Disclosure of Invention
The application aims to provide a method and a device for promoting esterification reaction, so as to solve the problem of high energy consumption caused by high-temperature and reduced-pressure conditions required by the conventional ester bond synthesis reaction.
The embodiment of the invention provides a method for promoting esterification reaction, which comprises the following steps:
mixing a hydroxyl-containing compound and a carboxyl-containing compound to obtain a mixed solution;
obtaining an electrolytic device comprising a cathode and an anode, the anode being provided with a compound having anion exchange capacity;
and electrolyzing the mixed solution by adopting the electrolysis device in the presence of a general chemical esterification catalyst to obtain the ester compound.
Optionally, the voltage of the electrolysis is 1.23V-4V.
Optionally, the voltage for effective electrolytic synthesis is 2V-4V.
It should be noted that the voltage is higher than the hydrolysis voltage, i.e. the hydrolysis can be carried out when the theoretical voltage is more than 1.23V, in order to increase the speed of electrolytic synthesis and overcome the polarization potential, the synthesis can be carried out at a higher speed when the voltage is more than 2V, and in order to avoid more substrate decomposition, the voltage is better at 4V; in practical production, the electrode distance can be changed according to the electrode distance and the reactor composition, the electrode distance can be adjusted according to specific production conditions, the smaller the distance is, the better the distance is, and the cathode and the anode are not in contact.
Optionally, the anode includes, but is not limited to: in one of the anion exchange membrane + electrode body, the anion exchange resin + electrode body, the graphite felt activated by hexadecyl trimethyl ammonium bromide, the electrode modified by micron-sized metal oxide or the electrode modified by nano-sized metal oxide, it should be noted that the above list of the compound with anion exchange capability is only used to illustrate that the method can be implemented and is not used to limit the present invention, and in other embodiments, the skilled person can select other compounds with anion exchange capability as required, and the compound can be a non-conductor or a semiconductor with anion exchange capability.
Alternatively, the hydroxyl-containing compounds include, but are not limited to: one of ethanol, ethylene glycol or lactic acid. In other embodiments, a person skilled in the art can select other hydroxyl-containing compounds having a hydroxyl functional group as needed.
Alternatively, the carboxyl-containing compounds include, but are not limited to: one of acetic acid, lactic acid or terephthalic acid. It should be noted that the above list of carboxyl-group-containing compounds is only used to illustrate that the method can be implemented, and is not meant to limit the present invention, and in other embodiments, one skilled in the art can select other carboxyl-group-containing compounds as needed, and the compounds may have any carboxyl functional group.
Alternatively, the catalyst includes, but is not limited to: cation exchange resin, sulfuric acid or sulfate.
Optionally, the hydroxyl-containing compound at least contains two hydroxyl groups, the carboxyl-containing compound at least contains two carboxyl groups, the mixed solution further includes an immiscible non-polar extractant, and the ester compound is an oligomer.
Optionally, the mixed solution further comprises an immiscible non-polar extractant.
Based on the same inventive concept, the embodiment of the invention also provides a device for promoting the esterification reaction, the device is an electrolysis device, and the anode of the electrolysis device is one of an anion exchange membrane + electrode body, an anion exchange resin + electrode body, a graphite felt activated by cetyl trimethyl ammonium bromide, a micron-sized metal oxide modified electrode or a nanometer-sized metal oxide modified electrode.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the method for promoting esterification provided by the embodiment of the invention comprises the following steps: mixing a hydroxyl-containing compound and a carboxyl-containing compound to obtain a mixed solution; obtaining an electrolytic device comprising a cathode and an anode, the anode being provided with a compound having anion exchange capacity; electrolyzing the mixed solution by using the electrolysis device in the presence of an esterification catalyst to obtain an ester compound; the ester bond is synthesized by adopting an electrolysis mode, so that the ester bond synthesis can be carried out at normal temperature and normal pressure, the energy consumption for producing the ester compound is effectively reduced, and the method has remarkable economic benefit.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flow chart of a method provided by an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a method of facilitating an esterification reaction, the method including:
s1, mixing a hydroxyl-containing compound and a carboxyl-containing compound to obtain a mixed solution;
s2, obtaining an electrolysis device, wherein the electrolysis device comprises a cathode and an anode, and the anode is provided with a compound with anion exchange capacity;
and S3, electrolyzing the mixed solution by using the electrolysis device under the condition of a catalyst to obtain the ester compound.
In actual operation, when the proportion of the compound with anion exchange capacity to the electrode, the voltage and the electrode distance are adjusted, the relative speed of esterification reaction and side reaction can be controlled, so that complete esterification reaction or synthesis of different products under different proportions of raw materials is realized.
For example, in example 1 described below, when the electrolysis voltage was increased to 4V, most of ethanol was converted to acetic acid, and a small amount of ethyl acetate was synthesized, and in example 3 described below, the yield of ethyl pyruvate increased and the yield of ethyl lactate decreased, specifically, when the voltage was increased to 3V or more, about 1/3 ester product was ethyl pyruvate, and when the voltage was increased to 4V or more, pyruvic acid was significantly generated.
In the presence of a nonpolar extractant which is insoluble in the reaction system, compounds containing a plurality of hydroxyl or carboxyl groups can be further polymerized into oligomers which enter the nonpolar phase after ester bonds are formed.
The method and apparatus for promoting esterification reaction of the present application will be described in detail with reference to examples, comparative examples and experimental data.
In the following specific examples, the voltage was 2.0V, the cathode was 5 × 3cm 304 stainless steel, the anode was 5 × 3cm graphite plate, the distance between the anode and the cathode was 1cm, the cathode surface of the anode was wound with 1m long 0.1mm phi titanium wire to fix 5 × 3cm AMI7001 anion exchange membrane, concentrated sulfuric acid was used as a chemical catalyst, the concentrated sulfuric acid loading was 2%, and the volume of the reaction system was 40ml, unless otherwise specified.
Example 1
Electrolyzing acetic acid and ethanol to synthesize ethyl acetate, which comprises the following steps:
mixing concentrated sulfuric acid with 95% ethanol, and mixing the concentrated sulfuric acid with chemically pure acetic acid according to the volume ratio of 3: 1 mixed electrolysis, basically complete reaction after 8 hours, and obtaining the yield of the ethyl acetate of more than 95 percent according to the calculation of the amount of the ethanol. The remaining small amount of ethanol is also converted into acetic acid basically, after half of the reaction solution is removed, the same volume of ethanol is added again, the reaction can be completed again within 12 hours, and the corresponding amount of ethyl acetate is obtained.
Example 2
The contents of this example and example 1 are the same, except that: cetyl trimethylammonium bromide activated graphite felt was used instead of the anion exchange membrane.
Example 3
The ethyl lactate is synthesized by electrolyzing acetic acid and lactic acid, which comprises the following specific steps:
mixing the concentrated sulfuric acid with 95% ethanol, and mixing the concentrated sulfuric acid with chemical pure lactic acid according to the volume ratio of 1: 3, mixed electrolysis, basically complete reaction after 12 hours, and obtaining the yield of the ethyl lactate of more than 95 percent according to the calculation of the ethanol amount, wherein the residual lactic acid is unchanged. If the voltage is 2.2V and above, part of the ethyl pyruvate is generated.
Example 4
The method for synthesizing the oligomeric ethylene terephthalate by electrolyzing the ethylene glycol and the terephthalic acid comprises the following steps:
after electrolyzing ethylene glycol of chemical purity 35mL and terephthalic acid of 1g for 4 hours at 200rpm, petroleum ether of 60-90 mL is added to the reaction solution, and after further reaction for 12 hours, oligomeric ethylene terephthalate of polymerization degree 40-100 of about 0.05g can be obtained in the petroleum ether phase.
Example 5
The lactic acid and terephthalic acid are electrolyzed to synthesize the terephthalic acid lactate as follows:
after chemically pure 45mL of ethylene glycol and 1g of terephthalic acid are electrolyzed at 200rpm for 12 hours, about 0.1g of lactic acid terephthalate can be obtained.
It should be noted that the above examples are only for illustrating the method to be implemented, and not for limiting the present invention, and in other examples, the implementation conditions include, but are not limited to, the above specific conditions, wherein the specific conditions of the anion exchange compound, the method of combining the anion exchange compound and the anode, the chemical catalyst, the electrode distance, the voltage, and the like can be changed, for example, in implementation example 1: replacing the anion exchange membrane with anion exchange resin, and inserting the anode plate into the anion exchange resin; or using sulfate as a chemical catalyst instead of sulfuric acid; or a titanium plate or a stainless steel plate is used as an anode plate, and the like, and the reaction progress degree is not influenced except the synthesis speed. In actual production, the reaction conditions can be specifically designed according to specific requirements.
Comparative example 1
Acetic acid and ethanol are electrolyzed to synthesize ethyl acetate by adopting the existing high-temperature reduced-pressure condition.
The energy consumption ratios for examples 1-5 and comparative example 1 are shown in the following table:
| energy consumption | Time consuming | |
| Example 1 | < 1 kilowatt-hour | 8 |
| Example 2 | < 1 kilowatt-hour | 8 |
| Example 3 | < 1 kilowatt-hour | 12 |
| Example 4 | < 1 kilowatt-hour | 16 |
| Example 5 | < 1 kilowatt-hour | 12 |
| Comparative example 1 | Greater than 7 kilowatt-hour | ＞12 |
From the above table, the method for producing the ester substance can effectively reduce the energy consumption in the production process and has obvious economic benefit.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) the method provided by the embodiment of the invention utilizes an electrolysis method to realize esterification reaction under the conditions of normal temperature and normal pressure, and solves the problems of high energy consumption and high equipment requirement of the common chemical method;
(2) the method provided by the embodiment of the invention utilizes an electrolysis method, can decompose water generated in the esterification reaction process to generate hydrogen and oxygen, and generates additional economic benefit while eliminating the pollution of waste water containing organic compounds;
(3) the method provided by the embodiment of the invention can realize further reaction of substrates and products of certain ester synthesis reaction by adjusting electrolysis conditions, thereby reducing the actual production requirement and producing other compounds with economic value;
(4) the method provided by the embodiment of the invention has low requirements on the electrolysis device, can realize continuous production and reduces the production difficulty.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of promoting esterification, the method comprising:
mixing a hydroxyl-containing compound and a carboxyl-containing compound to obtain a mixed solution;
obtaining an electrolytic device comprising a cathode and an anode, the anode being provided with a compound having anion exchange capacity;
and electrolyzing the mixed solution by adopting the electrolysis device in the presence of an esterification catalyst to obtain the ester compound.
2. The method of promoting esterification according to claim 1, wherein the voltage of the electrolysis is 1.23V to 4V.
3. The method of claim 2, wherein the voltage effective for electrolytic synthesis is 2V to 4V.
4. The method of promoting esterification according to claim 1, wherein the anode comprises: anion exchange membrane + electrode body, anion exchange resin + electrode body, graphite felt activated by hexadecyl trimethyl ammonium bromide, electrode modified by micron-sized metal oxide or electrode modified by nano-sized metal oxide.
5. The method of promoting esterification according to claim 1, wherein the hydroxyl containing compound comprises: one of ethanol, ethylene glycol or lactic acid.
6. The method of promoting esterification according to claim 1, wherein the carboxyl-containing compound comprises: one of acetic acid, lactic acid or terephthalic acid.
7. The method of promoting esterification according to claim 1, wherein the catalyst comprises: sulfuric acid, sulfate, or cation exchange resin.
8. The method of claim 1, wherein the hydroxyl-containing compound has at least two hydroxyl groups, the carboxyl-containing compound has at least two carboxyl groups, the mixed solution further comprises an immiscible non-polar extractant, and the ester compound is an oligomer.
9. The method of claim 8, wherein the mixed solution further comprises an immiscible non-polar extractant.
10. The device for promoting the esterification reaction is characterized in that the device is an electrolytic device, and an anode of the electrolytic device is one of an anion exchange membrane + electrode body, an anion exchange resin + electrode body, a graphite felt activated by hexadecyl trimethyl ammonium bromide, a micron-sized metal oxide modified electrode or a nanometer-sized metal oxide modified electrode.
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| CN101899673A (en) * | 2010-07-20 | 2010-12-01 | 华东师范大学 | A kind of synthetic method of 3-oxocyclohexane-1-carboxylate ethyl ester |
| US20200283918A1 (en) * | 2017-09-08 | 2020-09-10 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Method for producing lactic acid |
| CN113122870A (en) * | 2021-04-06 | 2021-07-16 | 万华化学集团股份有限公司 | Method for preparing vitamin A palmitate by electrochemical method |
| CN114000169A (en) * | 2021-11-30 | 2022-02-01 | 武汉大学 | Electrochemical preparation method of allicin compound |
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