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A method for co-producing chemical products dimethyl benzyl alcohol and 1,2-pentanediol

A technology for dimethyl benzyl alcohol and chemical products, which is applied in the field of simultaneous synthesis of dimethyl benzyl alcohol and 1,2-pentanediol, can solve the problems of low product selectivity, complicated process and high cost, and achieves simplified reaction process, The effect of reducing pollution and improving efficiency

Active Publication Date: 2020-12-04
台州泰捷化工科技有限公司
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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] 0.9mol of 1-pentene and 0.3mol of 60% cumene hydroperoxide were added to 300ml of tetrahydrofuran solution, then 15mmol of 2-ethylhexanoate molybdenum and 3mmol of lithium chloride were added, heated to 60°C, and 100ml of water was added after 3 hours of reaction , and continue to stir the reaction for 2 hours. After the reaction is complete, the reaction solution is rectified to obtain 1,2-pentanediol and dimethylbenzyl alcohol, respectively. The conversion rate of the raw material cumene hydroperoxide was 99.1%, the selectivity of 1,2-pentanediol was 85.9%, and the selectivity of dimethylbenzyl alcohol was 91.4%.

Embodiment 2

[0028] Add 0.9mol 1-pentene and 0.3mol60% cumene hydroperoxide to 300ml tetrahydrofuran solution, then add 15mmol copper acetylacetonate and 3mmol lithium chloride, heat to 60°C, add 100ml water after reacting for 3 hours, continue The reaction was stirred for 2 hours. After the reaction was completed, the reaction solution was rectified to obtain 1,2-pentanediol and dimethylbenzyl alcohol, respectively. The conversion rate of the raw material cumene hydroperoxide is 90.8%, the selectivity of 1,2-pentanediol is 80.4%, and the selectivity of dimethylbenzyl alcohol is 86.2%.

Embodiment 3

[0030] Add 0.9mol 1-pentene and 0.3mol60% cumene hydroperoxide to 300ml tetrahydrofuran solution, then add 15mmol cobalt acetylacetonate and 3mmol lithium chloride, heat to 60°C, add 100ml water after reacting for 3 hours, continue The reaction was stirred for 2 hours. After the reaction was completed, the reaction solution was rectified to obtain 1,2-pentanediol and dimethylbenzyl alcohol, respectively. The conversion rate of the raw material cumene hydroperoxide is 96.4%, the selectivity of 1,2-pentanediol is 82.7%, and the selectivity of dimethylbenzyl alcohol is 92.3%.

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Abstract

The invention provides a method for co-production of chemical products of dimethyl benzyl alcohol and 1,2-pentanediol. The method comprises the following steps: reacting by taking 1-pentene and cumenehydroperoxide as reaction raw materials under the action of a main catalyst and an auxiliary catalyst to obtain the dimethyl benzyl alcohol and the 1,2-pentanediol, wherein the main catalyst is acetylacetonate salt or 2-ethyl caproate; the auxiliary catalyst is one or more of ferric trichloride, stannic chloride, tin trifluoromethanesulfonate, lithium chloride, lithium bromide and boron trifluoride. According to the method disclosed by the invention, the reaction is not required to be subjected to post-treatment; an open-loop reaction of the next step can be performed directly; the selectivity for simultaneously producing the products of the 1,2-pentanediol and the dimethyl benzyl alcohol can reach 96 percent and 98 percent or more respectively; a reaction process is greatly simplified and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of chemical product synthesis, in particular to a method for simultaneously synthesizing dimethylbenzyl alcohol and 1,2-pentanediol. Background technique [0002] 1,2-Pentanediol is a straight-chain diol and an important pharmaceutical and chemical raw material. Procyclomile is a systemic three-mile fungicide synthesized by a Belgian pharmaceutical company named Janssen in the late 1970s. It has a very broad application prospect. 1,2-Pentanediol is a key intermediate in the preparation of the fungicide Procyclol, and more than 80% of the world's 1,2-Pentanediol is used to produce Procyclol. 1,2-Pentanediol can also be used to produce polyesters and surfactants; 1,2-Pentanediol also has moisturizing ingredients, and it can be used as a cosmetic with a strong synergistic effect when used in combination with other moisturizing agents. Or a moisturizing ingredient for personal and care products; 1,2-pentanedio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/00C07C33/20C07C29/48C07C31/20B01J31/26B01J31/22
CPCB01J31/2208B01J31/26C07C29/00C07C29/48C07C33/20C07C31/20
Inventor 金泰
Owner 台州泰捷化工科技有限公司