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[Chemical Knowledge]：Production process and preparation method of diphenyl carbonate-99%-(DPC)

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Diphenyl carbonate is an important organic compound, which is widely used in plastics, coatings, adhesives and other fields. This article will introduce the production process and preparation method of diphenyl carbonate, focusing on a high purity diphenyl carbonate (99%) preparation method.

1. diphenyl carbonate production process

diphenyl carbonate production process is mainly divided into two kinds: heavy diphenyl carbonate and benzoic acid method. Among them, the benzoic acid method is a more common production process at present. The main reaction of

benzoic acid method is the transesterification of benzoic acid and phenol. The reaction equation is as follows:

Ph-CO-OH + Ph-OH Ph-CO-O-Ph + H2O

The reaction needs to be carried out under high temperature and high pressure, and the commonly used catalyst is tin chloride or colorimetric catalyst. The products obtained after the reaction were diphenyl carbonate and water. The preparation method of

2. diphenyl carbonate-99%-(DPC)

diphenyl carbonate-99%-(DPC) refers to diphenyl carbonate with a purity of 99%, wherein DPC is an abbreviation of the compound.

preparation methods are as follows:

1. Material preparation

phenol, benzoic acid, suspending agent, catalyst, solvent, sodium bicarbonate.

2. reaction process

(1) phenol, benzoic acid, suspending agent, catalyst, solvent according to a certain proportion of mixing, will be added to the reaction kettle, and in the reaction kettle for constant temperature stirring.

(2) Sodium bicarbonate was added to the reaction kettle and stirred until completely dissolved.

(3) After the start of the reaction, the temperature is raised, the temperature is controlled between 150 and 180 ° C., and the reaction is continued for 8 to 10 hours.

(4) After completion of the reaction, the reaction vessel was cooled to room temperature, and the unreacted solid was filtered off to obtain a mixture. The mixture was recrystallized from tetrahydrofuran to give diphenyl carbonate (DPC) with a purity of 99%.

3. Summary

Diphenyl carbonate is an important organic compound with broad application prospects. This article introduces two production processes of diphenyl carbonate, and introduces the method of preparing high purity diphenyl carbonate in detail. This method can prepare 99% of diphenyl carbonate, which provides a wider range of possibilities for its application.