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Method and device for preparing electronic grade ethylene glycol

A technology of ethylene glycol and electronic grade, which is applied in the field of preparation of electronic grade ethylene glycol, which can solve problems such as environmental pollution, pollution, and material loss, and achieve the effects of reducing production costs, reducing pollution, and avoiding material loss

Pending Publication Date: 2022-08-09
HUIZHOU CAPCHEM CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ethylene carbonate (abbreviated as EC) is an organic solvent and organic synthesis intermediate with excellent performance. It has the advantages of high boiling point, low toxicity and low corrosion. It is widely used in plastics, printing and dyeing, polymer synthesis, gas separation and electrochemical chemistry. In other fields, the earliest industrial preparation method of ethylene carbonate is the phosgene method, but this method has the disadvantages of long process flow, low yield, high production cost, high toxicity, and serious pollution; the production of EC by transesterification is limited to the laboratory stage , not suitable for large-scale industrial production
[0003] CN107915708B discloses a method for producing ethylene carbonate from ethylene oxide and carbon dioxide, by adopting ethylene oxide and carbon dioxide to produce ethylene carbonate under high-temperature catalytic conditions, which is a widely used method for preparing ethylene carbonate in industry (i.e. cycloaddition process), which uses ethylene oxide and carbon dioxide as raw materials, has the advantages of low production cost, high conversion rate and high selectivity, not only in line with the concept of "green chemistry" and "atom economy", but also Can reduce CO in industrial tail gas 2 The greenhouse effect caused by the emissions; however, when the cycloaddition process is used to prepare ethylene carbonate, it is often accompanied by the generation of by-products, such as polyethylene glycol, ether, etc., and the boiling point of these by-products is lower than that of carbonic acid The boiling point of vinyl ester; Therefore, before collecting product ethylene carbonate, described by-product can be extracted from the tower top reflux part of rectifying tower, if described by-product is directly discharged in the environment, can not only cause the pollution of environment , will also cause material loss

Method used

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  • Method and device for preparing electronic grade ethylene glycol
  • Method and device for preparing electronic grade ethylene glycol
  • Method and device for preparing electronic grade ethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] High temperature and normal pressure hydrolysis: The raw material containing 10g of ethylene carbonate, 10g of diethylene glycol and 10g of ethylene oxide is placed in a 100ml high temperature and normal pressure hydrolysis reaction kettle 1 containing 15g of water, 0.045g of potassium carbonate is added, and under the condition of 105 ° C reaction for 4 hours;

[0029] High temperature and high pressure hydrolysis: pass the primary product after the high temperature and normal pressure hydrolysis reaction into the high temperature and high pressure hydrolysis reactor 2 containing 15 g of water and 0.045 g of potassium hydroxide, and react 2 under 120 ° C and 1.3 Mpa pressure conditions. Hour;

[0030] Vacuum distillation: the secondary product after the high temperature and high pressure hydrolysis reaction is passed into the vacuum distillation column 3, the pressure at the top of the vacuum distillation column 3 is set to be -0.08Mpa, and the reflux ratio is 2 , the...

Embodiment 2

[0032] High temperature and normal pressure hydrolysis: The raw material containing 10g of ethylene carbonate, 10g of diethylene glycol and 10g of ethylene oxide is placed in a 100ml high temperature and normal pressure hydrolysis reactor 1 containing 15g of water, 0.045g of potassium carbonate is added, and under the condition of 120 ° C reaction for 6 hours;

[0033] High-temperature and high-pressure hydrolysis: pass the primary product after the high-temperature and normal-pressure hydrolysis reaction into the high-temperature and high-pressure hydrolysis reactor 2 containing 15 g of water and 0.045 g of potassium hydroxide, and react 4 at 110 ° C and 1.0 Mpa pressure conditions. Hour;

[0034] Vacuum distillation: the secondary product after the high temperature and high pressure hydrolysis reaction is passed into the vacuum distillation column 3, and the pressure at the top of the vacuum distillation column 3 is set to be -0.08Mpa, and the reflux ratio is 2.5 , the temp...

Embodiment 3

[0036] High-temperature and normal-pressure hydrolysis: The raw material containing 10g of ethylene carbonate, 10g of diethylene glycol and 10g of ethylene oxide was placed in a 100ml high-temperature and normal-pressure hydrolysis reactor 1 containing 15g of water, 0.045g of potassium carbonate was added, and 0.045g of potassium carbonate was added. reaction for 5 hours;

[0037] High temperature and high pressure hydrolysis: pass the primary product after the high temperature and normal pressure hydrolysis reaction into the high temperature and high pressure hydrolysis reactor 2 containing 15 g of water and 0.045 g of potassium hydroxide, and react 3 under 120 ° C and 1.5 Mpa pressure conditions. Hour;

[0038]Vacuum distillation: the secondary product after the high temperature and high pressure hydrolysis reaction is passed into the vacuum distillation column 3, the pressure at the top of the vacuum distillation column 3 is set to be -0.08Mpa, and the reflux ratio is 3 , ...

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Abstract

The invention relates to the technical field of chemical engineering, in particular to a method and a device for preparing electronic grade ethylene glycol, by-products obtained by preparing ethylene carbonate through a cycloaddition process and ethylene carbonate remaining in the by-products are jointly used as raw materials, and are sequentially subjected to high-temperature normal-pressure hydrolysis reaction and high-temperature high-pressure hydrolysis reaction to obtain the electronic grade ethylene glycol. And reacting to obtain the electronic grade ethylene glycol. The method for preparing the electronic grade ethylene glycol is simple, by-products generated when ethylene carbonate is prepared through a cycloaddition process are fully utilized, the production cost is greatly reduced, meanwhile, the influence of direct emission of the by-products on the environment is relieved, material loss is avoided, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method and a device for preparing electronic grade ethylene glycol. Background technique [0002] Ethylene carbonate (EC for short) is an organic solvent and organic synthesis intermediate with excellent performance. It has the advantages of high boiling point, low toxicity and low corrosiveness. It is widely used in plastics, printing and dyeing, polymer synthesis, gas separation and electrochemical chemistry. and other fields, the earliest industrial preparation method of ethylene carbonate is the phosgene method, but this method has shortcomings such as long process flow, low yield, high production cost, high toxicity and serious pollution; the production of EC by transesterification is limited to the laboratory stage. , not suitable for large-scale industrial production. [0003] CN107915708B discloses a method for producing ethylene carbonate with ethylene oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/09C07C29/80C07C31/20
CPCC07C29/095C07C29/80C07C31/202Y02P20/52
Inventor 叶梓浩汪斯斌何傲周选华
Owner HUIZHOU CAPCHEM CHEM CO LTD