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Method for preparing dimethyl succinate

A technology for dimethyl succinate and maleic anhydride, which is applied in the field of preparing dimethyl succinate, and can solve the problems of slow reaction speed of dimethyl succinate, difficulty in product separation and purification, and difficulty in performing thorough reaction, etc. problems, to achieve the effect of strong equipment applicability, flexible operation and fast response speed

Active Publication Date: 2011-12-07
RUNTAI CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] (2) The raw material succinic acid that prior art adopts is to obtain succinic acid by maleic anhydride through chemical or electrochemical hydrogenation reduction, the reaction rate of the succinic acid obtained and methyl alcohol reaction synthetic dimethyl succinate Slow, the reaction is difficult to carry out thoroughly, making the separation and purification of the product difficult;
The main disadvantage of this process route is that the reaction speed of synthesizing dimethyl succinate through the esterification reaction of succinic acid and methanol is slow, and the reaction is difficult to carry out thoroughly, which makes the separation and purification of the product difficult.

Method used

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  • Method for preparing dimethyl succinate
  • Method for preparing dimethyl succinate
  • Method for preparing dimethyl succinate

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Main process equipment The chemical reactor for monomethyl esterification reaction, diesterification reaction and re-esterification reaction is a tank-type stirred chemical reactor, the solid-liquid separation device is a sedimentation type solid-liquid separation device, and the oil-water separation device is The sedimentation type oil-water separator, the electrochemical reduction reactor is an ordinary flat-plate electrochemical reactor, the anode chamber and the cathode chamber of the electrochemical reduction reactor are separated by an isolation membrane, and the isolation membrane is preferably a cationic membrane.

[0063] As shown in the figure, a method for preparing dimethyl succinate is to prepare dimethyl butyrate with maleic anhydride and methanol as raw materials, and the method steps are as follows:

[0064] (1) Dehydration and impurity removal: methanol is added to the dehydration and impurity removal equipment, and alkaline earth metal oxides are added ...

Embodiment 2

[0081] Main process equipment The chemical reactor for monomethyl ester reaction, diesterification reaction and re-esterification reaction is a tubular chemical reactor, the solid-liquid separation device is a filter type solid-liquid separation device, and the oil-water separation device is a centrifugal type The oil-water separator, the electrochemical reduction reactor is a three-dimensional electrochemical reactor, the anode chamber and the cathode chamber of the electrochemical reduction reactor are separated by an isolation membrane, and the isolation membrane is preferably a cationic membrane.

[0082] As shown in the figure, a kind of method for preparing dimethyl succinate is to prepare dimethyl succinate with maleic anhydride and methanol as raw material, and the method steps are as follows:

[0083] (1) Dehydration and impurity removal: methanol is added to the dehydration and impurity removal equipment, and alkaline earth metal oxides are added to mix evenly for deh...

Embodiment 3

[0100] Main process equipment The chemical reactor for monomethyl esterification reaction, diesterification reaction and re-esterification reaction is a static mixer, the solid-liquid separation device is a centrifugal solid-liquid separation device, and the oil-water separation device is a high-efficiency oil-water The separator and the electrochemical reduction reactor are ordinary flat-plate electrochemical reactors, and the anode chamber and the cathode chamber of the electrochemical reduction reactor are separated by an isolation membrane, and the isolation membrane is preferably a cationic membrane.

[0101] As shown in the figure, a kind of method for preparing dimethyl succinate is to prepare dimethyl succinate with maleic anhydride and methanol as raw material, and the method steps are as follows:

[0102] (1) Dehydration and impurity removal: Add methanol to the dehydration and impurity removal equipment, add alkaline earth metal oxides and mix evenly to perform dehyd...

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Abstract

The invention relates to a method for preparing dimethyl succinate, which comprises the following steps that: (1) dehydration and decontamination: methanol and alkali-earth metal oxide are mixed, dehydrated and decontaminated; (2) separation of solid and liquid; (3) monoesterification reaction: maleic anhydride is added in the liquid-phase material which is obtained in the previous step; (4) vacuum distillation; (5) 2-esterification reaction; (6) evaporation; (7) mixing of oil and water; (8) separation of oil and water; (9) re-eesterification; (10) evaporation; (11) mixing of oil and water; (12)separation of oil and water; (13) electrochemical reduction: hydrogen is introduced to reduce dimethyl maleate to dimethyl succinate; (14) cooling and crystallization; (15) separation of solid and liquid: solid material enters the next step; (6) re-crystallization and separation: the product dimethyl succinate is obtained. The method is simple, and has reasonable process, low preparation cost, high product purity and good quality.

Description

technical field [0001] The invention relates to a method for preparing dimethyl succinate, in particular to a method for preparing dimethyl succinate by using maleic anhydride and methanol as raw materials, and belongs to the technical field of fine chemicals. Background technique [0002] Dimethyl Succinate, also known as Dimethyl Succinate. The CAS number is 106-65-0 and the molecular formula is C 4 h 10 o 4 , molecular weight 146.14, generally colorless crystal or liquid, melting point 19°C, boiling point 196.4°C, flash point 90°C, specific gravity 1.1198, refractive index 1.4197, easily soluble in organic solvents such as ether, methanol, ethanol and acetone, slightly soluble in water. Widely used in food, spices, daily chemicals, pharmaceuticals, coatings, rubber, plastics and other industries, used in the synthesis of light stabilizers, high-grade coatings, fungicides, pharmaceutical intermediates, is an important chemical intermediate, widely used in Raw material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/04C07C69/60C07C67/08C25B3/25
Inventor 许文林姚干兵王雅琼张淮浩张小兴施国茂
Owner RUNTAI CHEM CO LTD
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