Solid catalyst for hydration of epoxy compound to prepare diol and its application

Abstract

The invention particularly relates to a solid catalyst formed by assembling a racemic Co (salen) metal complex in a nano-reactor and used for the hydration reaction of an epoxy compound to prepare diol. The expression formula of the catalyst is: Co (salen) n / R, wherein R is a nano-reactor with a cage-type pore structure and Co (salen) is a racemic metal complex. A general molecular formula is shown as the following. And n represents the mass percent content of Co in the solid catalyst and ranges from 0. 1% to 1%. The catalyst can be used for a reaction of efficient catalysis of the hydration of an epoxy compound to prepare diol. The catalyst of the invention is characterized by simple preparation method, good reproducibility and easy recycling, thus being able to be used for industrial production.

Description

[0001] technical field [0002] The invention relates to hydration of epoxy compounds to prepare ethylene glycol, 1,2-propanediol and other diols, in particular to a catalyst for hydration of epoxy compounds and its application. Background technique [0003] Ethylene glycol (EG) is an important chemical raw material, which is widely used in the production of polyester fiber, automobile antifreeze, thawing fluid, etc. At present, the production of EG at home and abroad adopts the process route of direct hydration of ethylene oxide (EO). However, there are many problems in the process route as follows: 1. Long process flow; 2. High equipment investment; 3. Large energy consumption; 4. High molar ratio of water to EO (hereinafter referred to as water ratio, usually 20-25); 5. High production cost; 6, EG selectivity is poor. In order to solve the above problems, the catalytic hydration of EO has attracted attention. Although different catalyst systems have been developed,...

AI Technical Summary

Problems solved by technology

However, there are many problems in the process route as follows: 1. Long process flow; 2. High equipment investment; 3. Large energy consumption; 4. High molar ratio of water to EO (hereinafter referred to as water ratio, usually 20-25); 5. High production cost; 6. Poor EG selectivity

Although a lot of work has been done on the catalytic hydration of epoxy compounds, there are some problems in the efficiency of the catalyst, the method of catalyst preparation and the stability of the catalyst.

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