Phosgene producing method and equipment

Abstract

In the production of phosgene by reacting chlorine and carbon monoxide in the presence of an activated charcoal catalyst in a tube aggregate reactor with several reaction tubes surrounded by a coolant chamber, (a) the reaction tubes are cooled externally by evaporation cooling with water in the coolant chamber and (b) the reaction tubes operate at a pressure higher than that in the coolant chamber. An independent claim is also included for the plant used.

Description

[0001] Related patent application cross-reference [0002] This patent application claims priority under 35 U.S.C. §119(a)-(d) to German Patent Application No. 10 2004 041 777.6 filed August 28, 2004. Background of the invention [0003] The present invention relates to a process for the production of phosgene by the reaction of carbon monoxide (CO) and chlorine over activated carbon in a shell-and-tube reactor, wherein the heat of reaction is dissipated by evaporative cooling of reduced-pressure water. The invention also relates to a plant for the manufacture of phosgene comprising a shell-and-tube reactor, a steam / water separator, a heat exchanger (condenser), a sealable vacuum line and at least one device capable of detecting phosgene leakage into the coolant cycle monitoring device. [0004] The production of phosgene from CO and chlorine in shell-and-tube reactors over activated carbon catalysts is known from the prior art. See, for example, Ullmann's Encyclopedia of In...

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Problems solved by technology

This reaction between water and phosgene forms hydrochloric acid which leads to further corrosion

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