Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Eric Jakobs

Peter Lehner

Alfred Soppe

Friedhelm Steffens

Jürgen Kintrup

Knud Werner

Andre Rittermeier

Luyan Wu

Henrike Fink

Rainer Hellmich

Micky Qian

Jürgen Bittner

The present invention relates to a method and a system for separating and treating impurities from a hydrogen chloride liquid mixture from the process for preparing isocyanate with phosgenation including sending hydrogen chloride liquid mixture into a gas-liquid separation column for separation to yield a liquid phase flow with impurities at the bottom of the gas-liquid separation column, neutralizing the liquid phase flow comprising impurities with an alkaline liquid in the neutralization tank to yield a neutralized solution, and sending the neutralized solution into a waste liquid treatment device from said neutralization tank for treatment.

Method and a system for separating and treating impurities from a hydrogen chloride liquid mixture

The invention relates to a process for the preparation of isocyanates in a system network comprising an isocyanate production plant, a chlorine production plant and a phosgene production plant, in which carbon dioxide formed as a by-product is partially to completely condensed out with the gaseous chlorine formed in the chlorine production plant and enters into the phosgene preparation process and, after the preparation of phosgene, the predominant part of the carbon dioxide formed is thereby sluiced out of the system network in gaseous form.

Process for the preparation of isocyanates

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Krefeld, Germany

Eric Jakobs