Preparation method for dimethyl succinylo succinate (DMSS)

A technology of dimethyl succinyl succinate and dimethyl succinate, which is applied in the field of preparation of dimethyl succinyl succinate, can solve the problems that the production technology cannot be adapted to production, and achieve a recycling rate High, low investment costs, high returns

Inactive Publication Date: 2012-07-18
ZHEJIANG EUCHEM CHEM
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] Dimethyl succinyl succinate is the main raw material of Pigment Red 122 (chemical name: 2,9-methyl-quinacridone) produced by our company. The annual demand is more than 400 tons, and there is a rising demand Trend, the original dimethyl succinate succinate production technology, equipment can not adapt to the current stage of production, therefore, in urgent need of optimization and improvement

Method used

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  • Preparation method for dimethyl succinylo succinate (DMSS)
  • Preparation method for dimethyl succinylo succinate (DMSS)
  • Preparation method for dimethyl succinylo succinate (DMSS)

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Experimental program
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Embodiment Construction

[0035] 1. Esterification of dimethyl succinate

[0036] 1) Experimental instruments and reagents:

[0037] Electric magnetic stirrer, three-necked glass reaction flask, constant pressure dropping funnel, condenser tube, succinic acid, methanol, and 732 macromolecular resin are all industrial grade.

[0038] 2) Reaction device:

[0039] On the three-necked (reaction) bottle equipped with electric heating and electric magnetic stirring, install a thermometer, pure methanol dropping constant pressure funnel and steaming tube (condensing tube and single-necked bottle for collecting and recovering methanol with water).

[0040] 3) Esterification operation process:

[0041] On the three-necked (reaction) bottle equipped with electric heating and electric magnetic stirring, install a thermometer, add pure methanol dropwise to a constant pressure funnel and steam out tube (condenser and collect and recover the single-necked methanol bottle with water), and then pour it into the thre...

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Abstract

The invention discloses a preparation method for dimethyl succinylo succinate (DMSS). The method comprises the following steps of: a), esterifying dimethyl succinate; b), synthesizing DMSS, namely after reaction, cooling materials in a water bath to below 60 DEG C, adding methanol, stirring to pulpifying the materials, transferring into a special film pressure device into which high pressure can be introduced, and separating dimethyl succinate liquid out of dimethyl succinylo succinate sodium salt under pressure of 1.0 to 1.2 MPa to obtain a dimethyl succinylo succinate sodium salt solid filter cake; transferring the acidized materials into a vacuum filter and filtering, suction-filtering a mother solution, completely washing the filter cake by using hot water, and drying in a drying box at the temperature of between 90 and 100 DEG C for 18 hours to obtain DMSS. The preparation method is low in investment, main raw materials can be obtained easily, the preparation method is environment-friendly, and the recycling rate is high.

Description

technical field [0001] The invention relates to a preparation method of dimethyl succinate. Background technique [0002] Dimethyl succinyl succinate (abbreviation: DMSS) is an important intermediate for the synthesis of quinacridone series pigments, 1,4-cyclohexanedione and photosensitive polymers. The process optimization and development of this product, nearly In the past ten years, it has been paid more and more attention by domestic and foreign enterprises. [0003] Dimethyl succinyl succinate is the main raw material of Pigment Red 122 (chemical name: 2,9-methyl-quinacridone) produced by our company. The annual demand is more than 400 tons, and there is a rising demand Trend, the original dimethyl succinate succinate production technology, equipment can not adapt to the current stage of production, therefore, in urgent need of optimization and improvement. [0004] Pigment Red 122 is a kind of high-performance organic pigment. The pigment has bright color, good heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/757C07C67/313
Inventor 俞永泉范建云范国庆
Owner ZHEJIANG EUCHEM CHEM
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