Method for continuous production of dimethyl succinylo succinate

A technology of dimethyl succinyl succinate and dimethyl succinate, which is applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of organic compounds, etc., can solve the problem of long time, high energy consumption, and production capacity Low-level problems, to achieve the effects of low cost, reduced energy consumption, and good technical effects

Inactive Publication Date: 2017-07-28
淄博鸿润新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the technical defect of prior art, provides a kind of method of continuous production dimethyl succinyl succinate, to solve the problem of batch production of dimethyl succinyl succinate in the prior art As a result, there are technical problems such as long time, high energy consumption, and low production capacity.

Method used

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  • Method for continuous production of dimethyl succinylo succinate

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Embodiment 1

[0019] A method for continuous production of dimethyl succinyl succinate, characterized in that it may further comprise the steps:

[0020] 1) Take dimethyl succinate, heat it to 105°C under the condition of nitrogen protection and stirring, keep it for 20min, and then use the ratio of dimethyl succinate to sodium methoxide as 16:5 (mL:g ) to the methanol solution of dimethyl succinate and sodium methoxide dropwise, continuously dropwise at 110°C;

[0021] 2) After the reactant is added dropwise to a certain liquid level, the material is continuously transferred to another reactor and kept warm to obtain a filter cake of dimethyl succinate sodium salt;

[0022] 3) adjust the pH to 2 with 17% mass fraction of dilute sulfuric acid solution, acidify, then filter the reactant, then wash the filter cake with water and dry to obtain dimethyl succinate.

[0023] On the basis of the above technical solutions, the following conditions are met:

[0024] The reaction site of step 1) is...

Embodiment 2

[0028] A method for continuous production of dimethyl succinyl succinate, characterized in that it may further comprise the steps:

[0029] 1) Take dimethyl succinate, heat it to 100°C under the condition of nitrogen protection and stirring, keep it for 20min, then use the ratio of dimethyl succinate to sodium methoxide as 16:5 (mL:g ) to the methanol solution of dimethyl succinate and sodium methoxide dropwise, continuously dropwise at 100°C;

[0030] 2) After the reactant is added dropwise to a certain liquid level, the material is continuously transferred to another reactor and kept warm to obtain a filter cake of dimethyl succinate sodium salt;

[0031] 3) adjust the pH to 2 with 15% by mass fraction of dilute sulfuric acid solution, acidify, then filter the reactant, then wash the filter cake with water and dry to obtain dimethyl succinate.

Embodiment 3

[0033] A method for continuous production of dimethyl succinyl succinate, characterized in that it may further comprise the steps:

[0034] 1) Take dimethyl succinate, heat it to 110°C under the condition of nitrogen protection and stirring, keep it for 20min, and then use the ratio of dimethyl succinate and sodium methoxide as 16:5 (mL:g ) to the methanol solution of dimethyl succinate and sodium methoxide dropwise, continuously dropwise at 120°C.

[0035] 2) After the reactant is added dropwise to a certain liquid level, the material is continuously transferred to another reactor and kept warm to obtain a filter cake of dimethyl succinate sodium salt;

[0036] 3) adjust the pH to 2 with 20% mass fraction of dilute sulfuric acid solution, acidify, then filter the reactant, then wash the filter cake with water and dry to obtain dimethyl succinate.

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Abstract

The invention provides a method for continuous production of dimethyl succinylo succinate. The technical scheme employs continuous drip adding to carry out Claisen condensation reaction on dimethyl succinate and sodium methoxide and Dieckmann condensation reaction, and can realize continuous discharge, after a certain product is collected, and then dilute sulfuric acid acidification is carried out to obtain dimethyl succinylo succinate. The method provided by the invention is designed based on classical experimental principles, and the operation mode is improved to form a brand-new technological process. The technical scheme shortens the reaction time, also reduces energy consumption, significantly improves the production efficiency, and at the same time overcomes the problem of large quality difference between different batches in batch production. The method provided by the invention takes innovative technological improvement and achieves good technical effect, simultaneously has the characteristics of low cost and easy realization, thus having good popularization prospect.

Description

technical field [0001] The invention relates to the technical field of chemical production, and further relates to a synthesis method of a fuel intermediate, in particular to a method for continuously producing dimethyl succinylsuccinate. Background technique [0002] Dimethyl succinyl succinate is the most representative key intermediate for the synthesis of quinacridone pigments, and dimethyl succinyl succinate used in the production of quinacridone pigments occupies the latter year More than 90% of the output. Therefore, with the increasing demand for quinacridone pigments in the market, dimethyl succinyl succinate has shown a huge market space and broad development prospects. [0003] The synthetic technique of dimethyl succinate succinate is a lot, mostly in the prior art in high-boiling inert organic solvent, with dimethyl succinate or diethyl succinate and sodium methylate or sodium ethylate effect Prepared by self-condensation. For a better reaction effect, some p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/757C07C67/313
CPCC07C67/313C07C67/343C07C69/757
Inventor 甄美静李丽高希会
Owner 淄博鸿润新材料有限公司
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