A method for preparing benzyl alcohol by directional decomposition of benzyl peroxide

A technology of benzyl peroxide and benzyl alcohol, which is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, the separation/purification of hydroxyl compounds, etc., and can solve the problems of chlorine in products

Active Publication Date: 2020-10-30
湖北科林博伦新材料有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, the core method of producing benzyl alcohol at home and abroad is the benzyl chloride hydrolysis method. Since this method inevitably leads to the chlorine content of the product, there is a contradiction with the green chlorine-free requirements of the downstream pharmaceutical, fragrance and cosmetics industries.

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  • A method for preparing benzyl alcohol by directional decomposition of benzyl peroxide

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Embodiment 1

[0026] Embodiment 1 A method for preparing benzyl alcohol by directional decomposition of benzyl peroxide comprises the following steps:

[0027] (1) First order decomposition reaction

[0028] The benzyl peroxide solution that the concentration that catalyzer triphenylphosphine, toluene liquid phase air oxidation reaction generate is 23% (wt) is sent in the primary decomposition reactor 1 continuously, in the decomposition reaction process, add The pH regulator sodium hydroxide adjusts the pH value of the reaction solution to 7.5, while controlling the temperature to 90°C, the pressure to 1.3MPa(G), and the residence time of the reaction solution to 30min. Under the action of the catalyst, the benzyl peroxidation in the reaction solution The directional decomposition of the substance is benzyl alcohol, and the conversion rate of benzyl peroxide in the primary decomposition reactor is 88% (wt). A small amount of non-condensable gas, and some acidic substances are neutralized ...

Embodiment 2

[0035] Embodiment 2 A method for preparing benzyl alcohol by directional decomposition of benzyl peroxide comprises the following steps:

[0036] (1) First order decomposition reaction

[0037] The benzyl peroxide solution of 25% (wt) that the concentration that catalyst tert-butyl chromate, toluene oxidation reaction generate is sent in the primary decomposition reactor 1 continuously, in the decomposition reaction process, add pH value Regulator potassium carbonate adjusts the pH value of the reaction solution to 8, while controlling the temperature to 100°C, the pressure to 1.5MPa(G), and the residence time of the reaction solution for 35 minutes. Under the action of the catalyst, the benzyl peroxide in the reaction solution decomposes directionally It is benzyl alcohol, and the conversion rate of benzyl peroxide in the primary decomposition reactor is 90% (wt). At the same time, in the primary decomposition reactor, the benzyl peroxide solution with higher pressure contain...

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Abstract

The invention discloses a method for preparing benzyl alcohol by utilizing directional decomposition of benzyl peroxide. Under a synergic effect of a catalyst and a pH regulator, the benzyl peroxide which is generated by the air oxidation of methylbenzene liquid phase is directionally decomposed into benzyl alcohol, so that a decomposing solution with the content of benzyl alcohol more than or equal to 50% is acquired. In the invention, the conversion rate of benzyl peroxide is 100%, the key link of converting benzyl peroxide into benzyl alcohol is realized and the purpose of efficiently producing benzyl alcohol through a methylbenzene air oxidation process is achieved. No chloride is introduced in the whole process of the method, so that the method is an environment-friendly green production technology.

Description

technical field [0001] The invention relates to a method for preparing organic compounds, in particular to a method for preparing benzyl alcohol by directional decomposition of benzyl peroxide, which belongs to the technical field of organic chemical production. Background technique [0002] Benzyl alcohol is an important chemical organic intermediate, widely used in textile auxiliaries, photosensitive materials, medicine, perfume and dye industries. In 2015, the total global production capacity of benzyl alcohol was about 331,200 tons. China is the world's largest producer of benzyl alcohol, accounting for 39.61% of the global total production capacity. At present, the core method of producing benzyl alcohol at home and abroad is the benzyl chloride hydrolysis method. Since this method inevitably leads to chlorine-containing products, there is a contradiction with the green chlorine-free requirements of the downstream pharmaceutical, fragrance and cosmetics industries. Wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C33/22C07C29/00C07C29/74C07C29/80
CPCC07C29/00C07C29/74C07C29/80C07C33/22
Inventor 宛捍东潘中华
Owner 湖北科林博伦新材料有限公司
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