Preparation of benzyl acetate

Abstract

The invention discloses a method for producing jasmal, which mainly adopts dibenzyl ether which is a high boiling waste produced by benzoic alcohol, as a raw material. The dibenzyl ether reacts with acetic anhydride in the presence of solid acid catalysts to obtain a crude product, and then the crude product is refined and purified to obtain an end product. The technology has simple operation process, stability, high efficiency, less pollution of the three wastes and applicability to the industrialized production.

Description

technical field [0001] The present invention relates to the manufacture method of chemical product, particularly a kind of method for preparing benzyl acetate. Background technique [0002] Benzyl acetate is a mature and widely used spice, mainly used in the preparation of jasmine-flavored essence and soap essence; in addition, it is also a widely used fine organic chemical product, used as resin, dye, oil, Solvents for inks, etc. [0003] At present, the preparation of benzyl acetate is mainly prepared by the following three methods: ① take benzyl chloride as raw material and synthesize it with sodium acetate in the presence of a phase transfer catalyst. ② It is obtained by reacting benzyl alcohol with acetic acid under the catalysis of strong ester (such as sulfuric acid). ③ Obtained by reacting dibenzyl ether with acetic anhydride under the catalysis of a superacid catalyst. [0004] Among the above-mentioned methods, the first two methods have been studied the most, w...

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Problems solved by technology

[0005] Dibenzyl ether is the main by-product in benzyl alcohol production (benzyl chloride hydrolysis method), and its amount reaches 13% (mass ratio) of benzyl alcohol final output, and it has occupied a considerable part in benzyl alcohol production cost; Benzyl ether is mostly underutilized except for a small part as a solvent

[0008] 1. The preparation of the catalyst itself requires more equipment, even more equipment than the production of ethyl benzyl ester, and the equipment cost is relatively large

[0009] 2. There are many operation steps in catalyst preparation, and there are many uncertain factors in the production process, so the quality is not easy to control

[0010] 3. Because the catalyst material titanium metal is relatively expensive, it needs to be recycled and reused, and the activity effect of the catalyst after regeneration is not easy to maintain stability

[0011] 4. The most difficult thing is that after industrial scale production, the corresponding equipment required for the roasting and activation operation in the preparation of catalysts in batches (such as 50-100 kg) is currently difficult to obtain

[0012] The above points have greatly limited the industrial application of the synthetic benzyl acetate process route with dibenzyl ether as raw material

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