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Catalyst and method for preparing chemical product 1,2-pentanediol by catalysis

A chemical product, pentanediol technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of low product selectivity, complicated process, high cost, etc., to simplify the reaction process and reduce pollution , the effect of improving efficiency

Inactive Publication Date: 2019-12-24
南京黛丽雅科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can co-produce dimethyl benzyl alcohol and 1,2-pentanediol at the same time, the method needs epoxidation reaction and hydrolysis reaction respectively, and rectification treatment needs to be carried out between the two-step reactions, and the reaction process is too complicated. Complicated, large energy consumption, high cost, at the same time, the selectivity of the preparation method dimethyl benzyl alcohol can only reach more than 90%, 1,2-pentanediol can only reach more than 80%, the selectivity of the product still lower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 0.9mol 1-pentene and 0.3mol60% cumene hydroperoxide to 300ml tetrahydrofuran solution, then add 15mmol molybdenum 2-ethylhexanoate and 3mmol lithium chloride, heat to 60°C, add 100ml water after 3 hours of reaction , continue to stir and react for 2 hours. After the reaction is complete, the reaction solution is rectified to obtain 1,2-pentanediol and dimethyl benzyl alcohol respectively. Among them, the conversion rate of raw material cumene hydroperoxide is 99.1%, the selectivity of 1,2-pentanediol is 85.9%, and the selectivity of dimethyl benzyl alcohol is 91.4%.

Embodiment 2

[0028] Add 0.9mol of 1-pentene and 0.3mol of 60% cumene hydroperoxide to 300ml of tetrahydrofuran solution, then add 15mmol of copper acetylacetonate and 3mmol of lithium chloride, heat to 60°C, add 100ml of water after 3 hours of reaction, and continue The reaction was stirred for 2 hours. After the reaction was complete, the reaction solution was rectified to obtain 1,2-pentanediol and dimethyl benzyl alcohol respectively. Among them, the conversion rate of raw material cumene hydroperoxide is 90.8%, the selectivity of 1,2-pentanediol is 80.4%, and the selectivity of dimethyl benzyl alcohol is 86.2%.

Embodiment 3

[0030] Add 0.9mol of 1-pentene and 0.3mol of 60% cumene hydroperoxide to 300ml of tetrahydrofuran solution, then add 15mmol of cobalt acetylacetonate and 3mmol of lithium chloride, heat to 60°C, add 100ml of water after 3 hours of reaction, and continue The reaction was stirred for 2 hours. After the reaction was complete, the reaction solution was rectified to obtain 1,2-pentanediol and dimethyl benzyl alcohol respectively. Among them, the conversion rate of raw material cumene hydroperoxide is 96.4%, the selectivity of 1,2-pentanediol is 82.7%, and the selectivity of dimethyl benzyl alcohol is 92.3%.

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Abstract

The invention relates to a catalyst and a method for catalytic preparation ofthereof in preparing a chemical product 1,2-pentanediol in a catalytic modeusing same. The catalyst comprises a primary catalyst and a secondary catalyst, and is characterized in that the primary catalyst is salt of acetylacetonate salt or 2-ethylhexanoic acid salt 2-ethyl caproate, the secondary catalyst is lewis acid, and lewis acid is one or more of ferric trichloride, stannic chloride, tin trifluoromethanesulfonate, lithium chloride, lithium bromide or boron trifluoride. A process of preparing 1,2-pentanediol canbe simplified through catalysis of the catalyst, and 1,2-pentanediol and dimethyl-benzyl carbinol can be co-produced, and selectivity of the products 1,2-pentanediol and dimethyl-benzyl carbinol can be as high as 96% and 98% or more separately.

Description

technical field [0001] The invention relates to the technical field of chemical product synthesis, in particular to a method for simultaneously synthesizing dimethyl benzyl alcohol and 1,2-pentanediol. Background technique [0002] 1,2-Pentanediol is a straight-chain diol and is an important pharmaceutical and chemical raw material. Propylcycline is a systemic three-mile fungicide synthesized by a Belgian pharmaceutical company named Janssen in the late 1970s. It is a high-efficiency, low-toxicity, active-spectrum fungicide with dual functions of protection and treatment. It has a very broad application prospect. 1,2-Pentanediol is the key intermediate for the preparation of fungicide Propylene Glycol. More than 80% of the world's 1,2-Pentanediol is used to produce Propylene Glycol. 1,2-pentanediol can also be used to produce polyester and surfactants; 1,2-pentanediol also has moisturizing effects, and it can be used in combination with other moisturizers to produce a stron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/00C07C33/20C07C31/20B01J31/26
CPCB01J31/26C07C29/00C07C33/20C07C31/20
Inventor 金泰
Owner 南京黛丽雅科技有限公司
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