Covestro Deutschland Ag

Maria Carrascosa Mas

Michael Merkel

Martin Ehrig

Manfred Kobylka

Jan Morbach

Christian Morten Jens

The present invention relates to a method for producing purified phosgene vapor, comprising the following steps: 1) providing a gas flow obtainable from the reaction of chlorine with carbon monoxide and comprising phosgene and carbon monoxide; 2) one-stage or multi-stage condensation of the gas flow and separation of non-condensable residue gases; 3) one-stage or multi-stage evaporation of the liquid phosgene obtained in step 2) and optional overheating of the produced phosgene vapour, wherein there is an energy integration between one or more of the condensation steps of step 2) and one or more of the evaporation steps in step 3) and the pressure in the last condensation step is between &#x2265;0.2 and &#x2264;6.0 bar higher than in the first evaporation step.

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Cologne, Germany

Maria Carrascosa Mas