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Production process of benzyl acetate

A technology of benzyl acetate and production process, which is applied in the field of production process of benzyl acetate, can solve the problems of large impact on equipment and environment, large impact on results, high production cost, etc., and achieve high catalytic activity, stability, and high activity Catalytic action, effect of improving yield and purity

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] At present, the preparation of benzyl acetate generally has three ways in the industry: the first is prepared from benzyl alcohol and acetic acid or acetic anhydride. The impact on equipment and the environment is relatively large, and the production cost is also high
The second is to adopt the by-product benzyl ether and acetic anhydride of benzyl alcohol to prepare benzyl acetate. The product obtained by this method has a mellow fragrance and is a high-quality product, but there is still the problem that the production cost is too high
[0004] However, in the prior art, the third method uses a single catalyst to catalyze the esterification reaction, and the phase transfer catalyst has a great influence on the result of the esterification reaction, which is not conducive to the control of the reaction in industrial production, and improper control will lead to esterification. The raw materials of the reaction cannot be timely and timely transferred to the same phase for the esterification reaction, which affects the yield of benzyl acetate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of production technology of benzyl acetate, specifically comprises following operation steps:

[0043] (1) Esterification reaction: Add 50 parts of sodium acetate solution (50%) into the reaction kettle, pump 100 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.

[0044](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

[0049] The difference between embodiment 2 and embodiment 1 is:

[0050] In the esterification reaction, the raw materials are 70 parts of sodium acetate solution 2 (55%), 150 parts of benzyl chloride, 25 parts of phase transfer catalyst raw material solution 2, and the temperature of the reaction liquid in the kettle is 125°C for the esterification reaction 18h; the first oil layer was added to the esterification reaction raw material, and the esterification reaction was continued for 4h; the second oil layer was added to the esterification reaction raw material, and the esterification reaction was continued for 3h. The purity of benzyl acetate in the product finally obtained is 99.96%, and the yield is 97.5%.

Embodiment 3

[0052] The difference between embodiment 3 and embodiment 1 is:

[0053] In the esterification reaction, the raw materials are 60 parts of sodium acetate solution 3 (65%), 130 parts of benzyl chloride, 15 parts of phase transfer catalyst raw material solution 3, and the temperature of the reaction liquid in the kettle is 110°C for esterification reaction 20h; the first oil layer is added to the esterification reaction raw material, and the esterification reaction is continued for 3h; the second oil layer is added to the esterification reaction raw material, and the esterification reaction is continued for 2h. The purity of benzyl acetate in the product finally obtained is 99.96%, and the yield is 96.3%.

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Abstract

The invention relates to the technical field of spice processing, particularly to a production process of benzyl acetate. The method comprises the following operation steps: an esterification reaction: adding benzyl chloride and a phase transfer catalyst raw material solution into a sodium acetate solution, and carrying out an esterification reaction to obtain a 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 anda third crude ester; and reduced pressure rectification: carrying out reduced pressure distillation on the third crude ester, and condensing the distillate to obtain the finished product benzyl acetate. With the process of the invention, the esterification reaction for industrially producing benzyl acetate is easy to control, and the yield of benzyl acetate is increased.

Description

technical field [0001] The invention relates to the technical field of spice processing, in particular to a production process of benzyl acetate. Background technique [0002] Benzyl acetate, also known as benzyl acetate, is a colorless oily liquid that is volatile. Benzyl Acetate is an ester fragrance with a strong jasmine and fruit aroma and a sweet smell. In the fragrance industry, it is often used to prepare food flavors such as apple, raw pear, banana, jasmine, cherry, pineapple, papaya, cream, etc. It can be used in medicine, food and cosmetics as an aromatic flavoring agent or fragrance. [0003] At present, the preparation of benzyl acetate generally has three ways in the industry: the first is prepared from benzyl alcohol and acetic acid or acetic anhydride. The equipment and the environment have a greater impact, and the production cost is also higher. The second is to prepare benzyl acetate by the by-product benzyl ether and acetic anhydride of benzyl alcohol. ...

Claims

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Application Information

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IPC IPC(8): C07C69/157C07C67/11C07C67/58C07C67/54B01J31/02
CPCC07C67/11C07C67/58C07C67/54B01J31/0239C07C69/157
Inventor 游云深田振江
Owner 天津大加化工有限公司
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