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Production method of ethylene glycol diacetate (EGDA)

A technology for the production of ethylene glycol diol, which is applied to the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, and can solve the problems of unsuitability for large-scale industrial production, high reaction temperature, equipment requirements, and high energy consumption. problems, achieve the effects of reducing solid pollutants and wastewater discharge, high activity, and improving production efficiency

Inactive Publication Date: 2013-12-11
JIANGSU HUALUN CHEM
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: high reaction temperature, high equipment requirements and high energy consumption, and the reaction is a discontinuous reaction, which is not suitable for large-scale industrial production

Method used

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Examples

Experimental program
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Embodiment Construction

[0011] 1. Preparation of catalyst:

[0012] 1. Please introduce the preparation method of the catalyst in detail:

[0013] Will 732 # After the ion exchange resin is washed with deionized water until clear water flows out, it is soaked in 4% NaOH for 8-12h, then washed with deionized water to neutrality, and then soaked in 5% hydrochloric acid for 8-12h to obtain H + Type resin. Take 0.1%~10% ZnCl of mass fraction 2 , FeCl 3 , AlCl 3 , NaCl, FeCl 2 Or a solution in KCl, perform ion exchange with ion exchange resin at a certain temperature, and finally wash with deionized water until there is no Cl - Exist, dry to constant weight in a vacuum oven, and obtain modified resin catalyst.

[0014] 2. Features of the catalyst:

[0015] It has the characteristics of metal ions, enhanced type, and macropores.

[0016] 2. Production of ethylene glycol diacetate (EGDA)

[0017] In a fixed bed reactor, ethylene glycol methyl ether and acetic acid are mixed at a molar ratio of 1:1.5-2, and preheated ...

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Abstract

The invention provides a production method of ethylene glycol diacetate (EGDA) and relates to a chemical synthesis technology. The production method of the EGDA comprises the following steps: in presence of a catalyst, carrying out an esterification reaction by taking ethylene glycol monomethyl ether and acetic acid as raw materials, and rectifying the obtained EGDA crude product to obtain an EGDA fine product, wherein the catalyst is metal-ion-modified styrene-divinyl benzene benzenesulfonic acid type acidic cation exchange resin with composite enhanced type macropores, the cation exchange resin is made by polymerizing styrene and divinyl benzene monomers and sulfonating on a benzene ring, and the metal ion is any one of Zn<2+>, Fe<3+>, Al<3+>, Na<+>, Fe<2+> or K<+>. By adopting the production method of the EGDA, the EGDA can be continuously produced, an operating mode is simple, raw material space velocity is high, production efficiency of the EGDA can be obviously improved, production cost of the EGDA can be reduced, and discharge of solid pollutants and waste water can be reduced; a reaction product does not need to be neutralized by adopting massive alkali, and service life of the catalyst is long.

Description

Technical field [0001] The invention relates to chemical synthesis technology, especially the production technology field of ethylene glycol diacetate. Background technique [0002] Ethylene glycol diacetate (EGDA) is an important industrial solvent. The solvent has a unique molecular structure. There are both non-polar and polar groups in the same molecule. Therefore, it is very resistant to both polar and non-polar The substances have good dissolving ability. It has the characteristics of high solubility, good thermal stability, small viscosity change and low corrosivity. It is widely used as a solvent in inks, paints, plastics, fragrances, medicines and other industries, such as a retardant solvent in automotive baking paints and a solvent for phenolic resin baking coatings. [0003] In the published paper "Development of Ester for Water Glass Sand Curing", acetic acid, acid anhydride and propylene oxide are used as raw materials and are carried out in an autoclave. The reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/16C07C67/24
Inventor 吴义彪陈忠平吴增才许飞李冬春潘学林
Owner JIANGSU HUALUN CHEM
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