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Solid catalyst for preparing diol by hydrating epoxy compound as well as preparation and application thereof

A solid catalyst and ligand technology, which can be used in the preparation of organic compounds, organic compounds/hydrides/coordination complex catalysts, preparation of hydroxyl compounds, etc., and can solve the problems of complicated preparation steps, high cost, poor stability of solid catalysts, etc. , to achieve the effect of good selectivity, easy separation and good tunability

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the prior art has problems such as poor stability of the solid catalyst for preparing diol by hydration of epoxy compounds, cumbersome preparation steps, and high cost.

Method used

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  • Solid catalyst for preparing diol by hydrating epoxy compound as well as preparation and application thereof
  • Solid catalyst for preparing diol by hydrating epoxy compound as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation of the catalyst is as follows: Dissolve 3.3 g of cobalt nitrate in 30 ml of absolute ethanol, mix and stir for 30 min, add 20 ml of ethanol containing 9.85 g of 2-methylimidazole, mix and stir for 30 min, add dropwise 10 ml of ethanol solution containing 3.3 g of zinc nitrate, After mixing, stir for 30 minutes, add dropwise 1ml of formic acid solution, add 4mmol of salicylaldehyde, stir, add 3mmol of o-diphenylamine, reflux for 12h, cool, separate the solid, wash and dry to obtain catalyst A.

Embodiment 2

[0023] The preparation of the catalyst is as follows: Dissolve 3.3 g of cobalt nitrate in 30 ml of absolute ethanol, mix and stir for 30 min, add 20 ml of ethanol containing 9.85 g of 2-methylimidazole, mix and stir for 30 min, add dropwise 10 ml of ethanol solution containing 3.3 g of zinc nitrate, After mixing, stir for 30 minutes, add 1ml of formic acid solution dropwise, add 8mmol of salicylaldehyde, stir, add 5mmol of o-diphenylamine, reflux for 12h, cool, separate the solid, wash and dry to obtain catalyst B.

Embodiment 3

[0025] The preparation of the catalyst is as follows: Dissolve 3.3 g of cobalt nitrate in 30 ml of absolute ethanol, mix and stir for 30 min, add 20 ml of ethanol containing 9.85 g of 2-methylimidazole, mix and stir for 30 min, add dropwise 10 ml of ethanol solution containing 3.3 g of zinc nitrate, After mixing, stir for 30 minutes, add dropwise 1ml of formic acid solution, add 16mmol of salicylaldehyde, stir, add 9mmol of o-diphenylamine, reflux for 12h, cool, separate the solid, wash and dry to obtain catalyst C.

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Abstract

The invention discloses a preparation method of a solid catalyst and application of the solid catalyst in preparation of a diol by hydration of an epoxy compound. The preparation method comprises thefollowing steps: 1) mixing and stirring an active metal M precursor, a ligand and a solvent; 2) adding a second metal precursor solution into a product obtained in the step 1), stirring, adding an acid solution and stirring, and 3) adding a diamine solution and an aldehyde solution and refluxing. The preparation method is good in operation convenience and repeatability, the prepared catalyst showsgood catalytic performance in the reaction, is easy to recycle and can be used for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a confined composite heterogeneous catalyst and its application in the reaction of epoxy compound hydration to diol. Background technique [0002] Ethylene glycol is a very important organic chemical raw material, mainly used in the production of polyester (resin, fiber and plastic) and as antifreeze and coolant. The direct hydration of ethylene oxide to ethylene glycol is the main technology for ethylene glycol production today. This technology requires the reaction to be carried out at 190-200°C, greater than 1.9MPa, and the molar ratio of water and ethylene oxide feed is 22-25:1. Its biggest disadvantage is the high energy consumption of subsequent water separation, and the energy consumption of producing 1 ton of ethylene glycol is as high as 6.1×10 9 Joule, the reaction efficiency is low, the residence time is longer than 25min, and the selectivity of ethylene glycol is only 88-91%. Introducing t...

Claims

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Application Information

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IPC IPC(8): B01J31/22C07C31/20C07C29/10
CPCB01J31/2282B01J31/1691C07C29/106B01J2531/845B01J2531/26B01J2531/0241B01J2531/0252B01J2231/487C07C31/202C07C31/205
Inventor 戈军伟何文军陶桂菊
Owner CHINA PETROLEUM & CHEM CORP