Method for preparing ethylene glycol diacetate

A technology of ethylene glycol diacetate, applied in the field of preparation of ethylene glycol diacetate, can solve the problems of producing a large amount of solid waste and waste water, low product selectivity, low production efficiency, etc., and achieve good Economic and environmental benefits, simple operation, and reduced production costs

Inactive Publication Date: 2014-09-17
江苏天音化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of ethylene glycol diacetate, which can overcome the need for neutralization treatment, low production efficiency, and the generation of a large amount of solid waste and waste water in the existing batch production process and other shor

Method used

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  • Method for preparing ethylene glycol diacetate

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Embodiment 1

[0021] process such as figure 1 As shown, the raw materials ethylene glycol and acetic acid preheated to 105°C are fed in a molar ratio of 1:3.5 at a flow rate of 15 L / h continuously into a 5 L composite reinforced macroporous polystyrene sulfonic acid type strongly acidic cation exchange resin. The first-stage fixed-bed reactor 1 with solid acid catalyst, the esterification reaction temperature is 105°C, and the space velocity is 3 h -1 . The material reacted in the first fixed-bed reactor 1 enters the distillation tower 3. In the distillation tower 3, the water generated by the esterification reaction forms an azeotrope at 68-71 °C in the presence of water-carrying agent benzene and is continuously absorbed separate. The material that is dehydrated is extracted continuously with 30 L / h flow rate in the stripping section of distillation tower 3 and is transported to the second stage fixed-bed reactor 2 that 5 L of above-mentioned solid acid catalysts are housed to continue ...

Embodiment 2

[0023] process such as figure 1 As shown, the raw materials ethylene glycol and acetic acid preheated to 110°C with a molar ratio of 1:4.5 were continuously input at a flow rate of 20 L / h into a 5 L composite reinforced macroporous polystyrene sulfonic acid type strongly acidic cation exchange resin. The first-stage fixed-bed reactor 1 with solid acid catalyst, the esterification reaction temperature is 110°C, and the space velocity is 4 h -1 . The materials reacted in the first fixed-bed reactor 1 enter the distillation tower 3, and in the distillation tower 3, the water generated by the esterification reaction forms an azeotrope at 69-71 °C in the presence of cyclohexane water-carrying agent and continuously was separated. The esterification reaction material that removes moisture is extracted continuously with 40 L / h flow rate in the stripping section of distillation tower 3 and is transported to the second section fixed-bed reactor 2 that 5 L of above-mentioned solid aci...

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Abstract

The invention discloses a method for preparing ethylene glycol diacetate. The method adopts ethanediol and acetic acid as raw materials, and is characterized by comprising the following steps: performing continuous fixed bed esterification reaction by adopting a solid acid catalyst at 70-150 DEG C, and performing azeotropic distillation on water generated in the esterification reaction to remove the water; rectifying an esterification reaction product, and removing and recovering unreacted acetic acid to obtain ethylene glycol diacetate. According to the method, continuous production of ethylene glycol diacetate is realized, the operation mode is simple, the production efficiency of ethylene glycol diacetate is remarkably improved, the production cost of ethylene glycol diacetate is reduced, solid pollutants and wastewater emission can be reduced, and excellent large-scale industrialized application values are achieved.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol diacetate, in particular to a method for preparing ethylene glycol diacetate through continuous esterification. Background technique [0002] Ethylene glycol diacetate is the abbreviation of 1,2-ethylene glycol diacetate (also known as ethylene glycol diacetate). paint, etc. It can also be used as a plasticizer for cellulose acetate filter rods instead of expensive glycerol triacetate, and high-purity ethylene glycol diacetate is an important additive for cast steel. [0003] Industrially, ethylene glycol diacetate is prepared from ethylene glycol and acetic acid through esterification. Although it is a general technical route, the method generally used in industry is sulfuric acid as a catalyst, batch type esterification and dehydration reaction process, and sulfuric acid as a catalyst. It has ideal catalytic activity and low price, but it is highly corrosive and easily causes side ...

Claims

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Application Information

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IPC IPC(8): C07C69/16C07C67/08C07C67/54
CPCC07C67/08C07C69/16
Inventor 秦怡生陈荣福秦小琪杨建国王伟蒋忠良张学君孙加龙
Owner 江苏天音化工有限公司
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