Method for preparing dibenzyl disulfide

Abstract

The invention relates to a method for preparing dibenzyl disulfide. The innovation points of the invention are that: water is taken as a reaction solvent; Na2S2, benzyl chloride and a catalyst are mixed and then react; the reaction temperature is between 30 and 50 DEG; the reaction time is between 10 and 40 minutes; the temperature of a reaction liquid is cooled to 20 DEG C after the reaction is finished; the pH value is adjusted to 7; and a separated organic phase is washed, dried and purified to obtain the dibenzyl disulfide. The method uses trioctylmethylammonium chloride as the catalyst to perform a catalytic reaction on the mixed Na2S2 and benzyl chloride, and has high yield of finished products which is improved by 15 to 20 percent compared with the prior synthetic method; and the method greatly reduces reaction time and reaction temperature, is easy to control reaction process, has few byproducts, and reduces the consumption of energy sources.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a preparation method of dibenzyl disulfide. Background technique [0002] Disulfide organic compound is an important organic intermediate, which has an important application in organic synthesis, especially in the synthesis of physiologically active compounds, and disulfide organic compound is also an important edible flavor monomer, which can be used in Flavoring flavors for prepared foods, which are widely used as flavor enhancers for convenience foods, among which symmetrical disulfide organic compounds, such as dimethyl disulfide, have a strong onion smell and are widely used in meat In the seasoning of , barbecue and soup, for example, difurfuryl disulfide has the smell of barbecue, roasting and caramel, and is mainly used for coffee and meat seasoning, while dibenzyl disulfide has caramel flavor , roasted aroma, mainly used for flavoring coffee, cocoa, sweet sauce and caramel...

AI Technical Summary

Problems solved by technology

[0009] 1. The reaction is carried out under ethanol reflux (about 80°C). The reaction time is relatively long, generally 3 to 4 hours, and the solvent ethanol must be recovered after the reaction is completed. The operation cycle is long and consumes more energy;

[0010] 2. Due to the long-term heating in the reaction, part of the disulfide will be decomposed into sulfide (R-S-R). If the chlorinated alkanes or chlorinated aromatics are sensitive to temperature, more by-products will be formed, which will bring pressure to the purity control. come difficult;

[0011] 3. The yield of the finished product after the reaction is low, generally less than or equal to 70%, resulting in waste of raw materials;

[0012] 4. For some chlorinated alkanes and chlorinated aromatics with low reactivity, the yield of disulfide organic compounds will be lower, even less than 50%.

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