Device and method for synthesizing bi(trichloromethyl) carbonic ester

Abstract

The invention discloses a device for synthesizing bi(trichloromethyl) carbonic ester. The device comprises a liquid chlorine gasifier, a dimethyl carbonate gasifier, a heat exchanger, a tubular reactor, a gas storage tank, a stirring kettle, a flaker and the like. The invention further discloses a method for synthesizing the bi(trichloromethyl) carbonic ester. The method comprises the following steps: mixing chlorine with gasified dimethyl carbonate in a mole ratio of (5-7):1, performing heat exchange so as to obtain mixed gas phase, feeding the mixed gas phase into the tubular reactor filled with a solid catalyst, keeping reaction temperature to be 90-100 DEG C and the pressure to be 0.1-0.15Mpa, and performing reaction for 5-10 minutes; recycling unreacted chlorine for circulation use; performing flash evaporation, and performing flaking molding, so as to obtain the bi(trichloromethyl) carbonic ester. By adopting the method for synthesizing the bi(trichloromethyl) carbonic ester, the use amount of the chlorine can be reduced, the reaction time can be shortened, the equipment security can be improved, the reaction efficiency is high, continuous reaction can be achieved, the product yield can be greatly increased, and the dimethyl carbonate conversion rate can be greatly increased.

Description

technical field [0001] The invention relates to a synthesis device and method of bis(trichloromethyl)carbonate, which belongs to the technical field of chemical industry. Background technique [0002] The traditional synthetic method of bis(trichloromethyl)carbonate mainly contains two kinds of solvent method and bulk method, because the used solvent of solvent method is the CCL that has destructive effect to ozone layer 4 , has been phased out. Bulk method is exactly dimethyl carbonate / chlorine gas chlorination method, and this method is to be raw material with dimethyl carbonate and chlorine gas, under light, heat or initiator trigger, synthesize bis (trichloromethyl) carbonate by chlorination reaction, This chlorination reaction is carried out in a free radical chain reaction distribution. The whole process of the reaction is divided into three stages of low, medium and high temperature, and the obtained product is almost pure. The process is to add a certain amount of ...

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Problems solved by technology

However, the process of this method is backward, the amount of by-product hydrochloric acid is large, and the pressure of environmental pollution is great, which affects the development and growth of the industry, and specifically has the following disadvantages:

[0004] ②In addition to being absorbed by water to become hydrochloric acid, the multi-purpose chlorine gas is absorbed by sodium hydroxide to become sodium hypochlorite, which increases the production of hydrochloric acid and sodium hypochlorite, increases the consumption of sodium hydroxide and water, and increases environmental pollution pressure

[0005] ③Although hydrochloric acid and sodium hypochlorite are the most basic chemicals, the units of use are limited, and the storage and transportation pressure is very high. If the industry does not match, due to the pressure of hydrochloric acid inventory, it may lead to equipment reduction or even shutdown

[0006] ④The reaction time is long, and a reaction cycle takes at least 5 hours, generally 5 to 7 hours, and continuous production cannot be realized

[0007] ⑤ The chlorination reaction adopts fragile glass equipment, and the gasket adopts polytetrafluoroethylene mat, which is easy to leak

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