Production process of benzyl propionate

Abstract

The invention relates to the technical field of perfume processing, in particular to a production process of benzyl propionate. The production process comprises the following operation steps: carryingout an esterification reaction, namely putting benzyl chloride and a phase transfer catalyst into a sodium propionate solution to carry out the esterification reaction and obtain first crude ester; carrying out primary water washing, namely washing the first crude ester to obtain first saline water and second crude ester; carrying out secondary water washing, namely washing the second crude esterfor a second time with water to obtain second saline water and third crude ester; carrying out vacuum distillation, namely carrying out vacuum distillation on the third crude ester, and carrying outfraction condensation, thereby obtaining a finished product benzyl propionate, wherein the phase transfer catalyst is a mixture of quaternary ammonium salt and quaternary phosphonium salt in a mass ratio of (1-1.6):(0.3-0.7). The green and environmentally-friendly phase transfer catalyst is adopted to replace an organic solvent which is large in toxicity and a catalyst which is intensive in corrosion in a conventional process, the product treatment process is simplified, the production process has the advantages of being green and environmentally-friendly, and the yield of benzyl propionate can be increased when being compared with that of a conventional process.

Description

technical field [0001] The invention relates to the technical field of spice processing, in particular to a production process of benzyl propionate. Background technique [0002] Benzyl propionate (Benzyl propionate), also known as benzyl propionate, is a colorless oily liquid with volatility and a sweet scent of flowers. It is widely used in the preparation of food, cigarettes, soaps, and daily cosmetic essences. Such as jasmine flavor, fruit flavor and so on. [0003] At present, there are two main industrial synthesis methods of benzyl propionate: one is the benzyl alcohol-propionic acid method, which is prepared by esterification, and the traditional catalyst is concentrated sulfuric acid or aluminum trichloride, iron trichloride, etc. Lewis acid, these catalysts have problems such as strong corrosiveness, many side reactions, troublesome product treatment, and environmental pollution from discharged waste liquid; It is prepared after dissolving a strong and toxic orga...

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Problems solved by technology

[0003] At present, there are two main industrial synthesis methods of benzyl propionate: one is the benzyl alcohol-propionic acid method, which is prepared by esterification, and the traditional catalyst is concentrated sulfuric acid or aluminum trichloride, iron trichloride, etc. Lewis acid, these catalysts have problems such as strong corrosiveness, many side reactions, troublesome product treatment, and environmental pollution from discharged waste liquid; Prepared after dissolving strong and toxic organic solvents, there are problems such as high toxicity and environmental pollution