Method used for combined production of dimethyl-benzyl carbinol and 1,2-pentanediol

A technology of dimethyl benzyl alcohol and pentanediol, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems affecting product concentration, difficulty in treating waste water, poor atomic economic benefits, etc., and achieves The effect of simple process and low synthesis cost

Active Publication Date: 2017-12-08
昌德新材科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in industry, dimethyl benzyl alcohol is mainly produced by the reduction reaction of cumene hydroperoxide and sodium sulfite. During the crystallization process of benzyl alcohol, it affects its product concentration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] At 90°C, a cumene solution of 1-pentene and 60% cumene hydroperoxide (the molar ratio of 1-pentene to cumene hydroperoxide is 2:1) in 2-ethylhexanoic acid The epoxidation reaction is carried out under the action of the molybdenum salt to obtain a reaction liquid containing 1,2-epoxypentane and dimethyl benzyl alcohol. The reaction solution was rectified to obtain 1,2-epoxypentane and dimethyl benzyl alcohol respectively.

[0048] At -10°C, 1,2-pentanediol with a molar ratio of 1:10 is hydrolyzed with water under the action of boron trifluoride, and rectified to obtain 1,2-pentanediol.

[0049] After calculation, the conversion rate of cumene hydroperoxide is 99.0%, the selectivity of 1,2-pentanediol is 86.3%, and the selectivity of dimethyl benzyl alcohol is 90.6%.

Embodiment 2

[0051] At 110°C, a cumene solution of 1-pentene and 60% cumene hydroperoxide (the molar ratio of 1-pentene to cumene hydroperoxide is 6:1) in 2-ethylhexanoic acid The epoxidation reaction is carried out under the action of the tungsten salt to obtain a reaction liquid containing 1,2-epoxypentane and dimethyl benzyl alcohol. The reaction solution was rectified to obtain 1,2-epoxypentane and dimethyl benzyl alcohol respectively.

[0052] At 30°C, 1,2-pentanediol with a molar ratio of 1:5 was hydrolyzed with water under the action of boron trifluoride, and rectified to obtain 1,2-pentanediol.

[0053] After calculation, the conversion rate of cumene hydroperoxide is 99.5%, the selectivity of 1,2-pentanediol is 83.3%, and the selectivity of dimethyl benzyl alcohol is 94.3%.

Embodiment 3

[0055]At 130 ° C, the cumene solution of 1-pentene and 50% cumene hydroperoxide (the molar ratio of 1-pentene to cumene hydroperoxide is 10:1) in the action of molybdenum acetylacetonate The epoxidation reaction was carried out under the following conditions to obtain a reaction liquid containing 1,2-epoxypentane and dimethyl benzyl alcohol. The reaction solution was rectified to obtain 1,2-epoxypentane and dimethyl benzyl alcohol respectively.

[0056] At 100°C, 1,2-pentanediol with a molar ratio of 1:20 is hydrolyzed with water under the action of fluoboric acid, and rectified to obtain 1,2-pentanediol.

[0057] After calculation, the conversion rate of cumene hydroperoxide is 99.9%, the selectivity of 1,2-pentanediol is 89.5%, and the selectivity of dimethyl benzyl alcohol is 97.8%.

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Abstract

The invention provides a method used for combined production of dimethyl-benzyl carbinol and 1,2-pentanediol. The method comprises following steps: 1-pentene and isopropyl benzene hydroperoxide are subjected to epoxidation reaction under the action of an epoxidation catalyst so as to obtain a reaction solution containing 1,2-cyclopentene oxide and dimethyl-benzyl carbinol; the reaction solution is subjected to separation so as to obtain 1,2-cyclopentene oxide and dimethyl-benzyl carbinol; 1,2-cyclopentene oxide and water are subjected to hydrolysis reaction under the action of a hydrolysis catalyst, and rectification is carried out so as to obtain 1,2-pentanediol. According to the method, 1-pentene and isopropyl benzene hydroperoxide are taken as the raw materials in combined production of dimethyl-benzyl carbinol and 1,2-pentanediol, operation is simple, synthesis cost is low, no waste water is generated in synthesis process, dimethyl-benzyl carbinol selectivity is 90% or higher, and 1,2-pentanediol selectivity is 80% or higher.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for co-producing dimethyl benzyl alcohol and 1,2-pentanediol. Background technique [0002] 1,2-pentanediol is an important fine chemical product with a wide range of uses. More than 80% of the world's 1,2-pentanediol is used in the production of propiconazole, and more than 90% of the domestic 1,2-pentanediol is used in the production of propiconazole. In addition, 1,2-pentanediol, as an excellent humectant, antibacterial agent and solubilizer, can effectively improve the hydrolysis resistance of sunscreen products. Studies have found that 1,2-pentanediol can reduce the particle size of the emulsion, which is beneficial to the stability of the emulsion. At the same time, it can reduce the sticky feeling caused by the addition of polymers in the formula, which helps to form a more detailed formula. Therefore, suitable for many cosmetics. In addition, due to the use of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/10C07C31/20C07D301/19C07D303/04C07C29/00C07C33/20
CPCC07C29/00C07C29/106C07D301/19C07D303/04C07C31/20C07C33/20
Inventor 罗小沅王乃良张智蒋卫和刘立成
Owner 昌德新材科技股份有限公司
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