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Production process of benzyl alcohol

A production process and technology of benzyl alcohol, applied in the field of production technology of benzyl alcohol, can solve the problems such as inability of products or intermediate products to be integrated into a cyclic chain, subsidiary products cannot be recycled, influence on the purity and yield of benzyl alcohol, and the like. Good phase transfer catalytic effect, improved raw material utilization, high catalytic activity and stability

Active Publication Date: 2020-03-24
天津大加化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the method for industrially preparing benzyl alcohol mainly contains two kinds of approaches: 1, benzyl chloride hydrolysis method, take benzyl chloride as raw material, obtain under the catalysis of alkali by heating and hydrolyzing; But pressurization, high temperature, Increasing or reducing the concentration is beneficial to the production of by-product benzyl ether, which affects the purity and yield of benzyl alcohol
2. Toluene oxidation method, under the action of alkaline catalyst, toluene is oxidized to prepare benzyl alcohol, but by-products include acetic acid and benzyl acetate, it is difficult to obtain high-purity benzyl alcohol
However, most of this method is currently suitable for small batch production or principle research operations in the laboratory. Because the raw material benzyl ester in the benzyl ester hydrolysis method is itself a component of spices, it has great application value. If it is purely for the production of benzyl alcohol However, benzyl esters are used as raw materials to prepare, and the obtained subsidiary products cannot be recycled in the production and processing of other products, and the raw materials, products or intermediate products cannot be integrated into a circular chain, which increases the production cost. is not desirable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A kind of production technology of benzyl acetate, specifically comprises following operation steps:

[0045] (1) Esterification reaction: Add 40 parts of sodium acetate solution (52%) into the reaction kettle, pump 90 parts of benzyl chloride into the metering tank through vacuum, then put it into the reaction kettle, and add 10 parts of The raw material liquid 1 of the phase transfer catalyst was continuously stirred, and the steam valve was opened to raise the temperature to 120° C., so that the temperature of the reaction liquid in the kettle was 100° C., and the esterification reaction was carried out for 15 hours to obtain the first crude ester.

[0046] (2) One-time water washing: put the first crude ester into the water washing tank, add cleaning water (distilled water + first water layer and second water layer) to wash the first crude ester, wash out the salt generated during the reaction, and obtain The first brine and the second crude ester; at this time, the...

Embodiment 2

[0051] The difference between embodiment 2 and embodiment 1 is:

[0052] (1) In the esterification reaction, the raw materials are 70 parts of sodium acetate solution 2 (55%), 150 parts of benzyl chloride, 20 parts of phase transfer catalyst raw material solution 2, and the temperature of the reaction solution in the kettle is 125°C. The esterification reaction is 18 hours; the first oil layer is added to the esterification reaction raw material, and the esterification reaction is continued for 4 hours; the second oil layer is added to the esterification reaction raw material, and the esterification reaction is continued for 3 hours. The purity of benzyl acetate in the product finally obtained is 99.94%, and the yield is 98.1%.

[0053] (5) Add 35wt% sodium hydroxide solution to the closed hydrolysis tank at one time, adjust the pH of the hydrolyzate to 13, and the temperature of the hydrolysis reaction to be 200°C; after hydrolysis, cool the reaction mixture to 100°C, separat...

Embodiment 3

[0055] The difference between embodiment 3 and embodiment 1 is:

[0056] (1) In the esterification reaction, the raw materials are 40 parts of sodium acetate solution 3 (58%), 90 parts of benzyl chloride, 20 parts of phase transfer catalyst raw material solution 3, and the temperature of the reaction solution in the kettle is 110°C. Esterification reaction for 20 hours; the first oil layer was added to the esterification reaction raw material, and the esterification reaction was continued for 3 hours; the second oil layer was added to the esterification reaction raw material, and the esterification reaction was continued for 2 hours. The purity of benzyl acetate in the product finally obtained is 99.95%, and the yield is 97.8%.

[0057] (5) Add 35wt% sodium hydroxide solution to the closed hydrolysis tank at one time, adjust the pH of the hydrolyzate to 13, and the temperature of the hydrolysis reaction to be 242°C; after hydrolysis, cool the reaction mixture to 150°C, separat...

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Abstract

The invention relates to the technical field of spice processing, particularly to a production process of benzyl alcohol. The production process comprises the following operation steps: esterificationreaction: adding benzyl chloride and a phase transfer catalyst raw material solution into a sodium acetate solution, and carrying out an esterification reaction to obtain first crude ester; primary water washing: washing the first crude ester with water to obtain first salt water and a second crude ester; secondary water washing: washing the second crude ester with water to obtain second salt water and a third crude ester; pressure reducing rectification: carrying out pressure reducing distillation on the third crude ester, and condensing the distillate to obtain a finished product benzyl acetate; and hydrolysis reaction: hydrolyzing the benzyl acetate under an alkaline condition to obtain benzyl alcohol. According to the invention, raw materials and products are integrated into a circulating chain, and the method is suitable for industrial mass production.

Description

technical field [0001] The invention relates to the technical field of spice processing, in particular to a production process of benzyl alcohol. Background technique [0002] Benzyl alcohol is a very useful fixative and an indispensable spice in the preparation of jasmine, moonshine, ylang-ylang and other flavors. It is mainly used to prepare berry and nut flavors. It can also be used to prepare soap and daily cosmetic essence. Benzyl alcohol also has a wide range of uses in the production of industrial chemicals, such as paint solvents, photographic developers, polyvinyl chloride stabilizers, medicines, synthetic resin solvents, solvents for vitamin B injections, preservatives for ointments or liquid medicines, It can also be used as a desiccant for nylon filaments, fibers and plastic films, and a solvent for dyes, cellulose esters, and casein. At the same time, it is widely used in pen making (ballpoint pen oil), paint solvent, etc. [0003] In the prior art, the metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/02C07C33/22
CPCC07C29/095C07C67/11C07C33/22C07C69/157Y02P20/584
Inventor 游云深田振江
Owner 天津大加化工有限公司
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