Low-consumption environment-friendly efficient phosgene synthesis technology

Abstract

The invention provides a series technology for producing phosgene in industry. Different from the traditional phosgene production technology in which one protection reactor is connected to the rear part of one main phosgene reactor, the technology provided by the invention adopts the scheme that one protection reactor is connected to the rear parts of two main reactors; the catalyst loading capacity of each main reactor is halved; the feeding of chlorine gas as a feed gas is divided into two parts, namely, one part of the chlorine gas enters the first main reactor, and the other part of the chlorine gas enters the second main reactor; when catalysts are replaced, a catalyst in the rear reactor is put into the front reactor, and a new catalyst is put into the rear reactor. Through the adoption of the technology, catalysts can be saved; besides, by virtue of the separate feeding of chlorine gas, the total matching ratio of the feed gas and carbon monoxide can be reduced, so that the consumption amount of carbon monoxide is reduced.

Description

technical field [0001] The invention relates to a method for industrially synthesizing phosgene by reacting carbon monoxide and chlorine. The method adopts a two-stage synthesis process to achieve the purpose of saving catalyst and carbon monoxide consumption; at the same time, by recovering the reaction heat of the previous stage of phosgene synthesis and reducing the subsequent stage of synthesis The amount of circulating water outside the device is used to reduce energy consumption. Background technique [0002] There are many methods for preparing phosgene, such as: carbon monoxide and chlorine mixed light method, carbon monoxide and chlorine gas are synthesized with chlorophosphine catalyst, carbon monoxide is reacted in metal chloride at high temperature, fuming sulfuric acid and carbon tetrachloride are reacted, and chromic acid is used to synthesize phosgene. Oxidation of aliphatic chlorides and thermal decomposition of trichloromethyl chloroformate and perchlorometh...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the absolute pressure of the coolant space is lower than the atmospheric pressure, so the coolant system must not only be a closed system, but also need corresponding vacuum equipment, and the vapor generated by evaporation is not recycled.

[0009] The high temperature in the known phosgene synthesis reaction tube will cause the deactivation of the activated carbon catalyst, so in order to ensure the continuous and stable phosgene synthesis, the catalyst needs to be replaced regularly, which brings about the consumption of the catalyst and the disposal of the replaced deactivated catalyst environmental issues

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