Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Andre Rittermeier

Friedhelm Steffens

Tim Loddenkemper

Peter Lehner

Alfred Soppe

Frank Gerhartz

Walther Müller

Timm Schmidt

Eric Jakobs

Thomas Burbach

Luyan Wu

Michael Venz

Micky Qian

Jürgen Bittner

Henrike Fink

Rainer Hellmich

Stefanie Eiden

A process for regenerating a catalyst containing ruthenium or ruthenium compounds, which includes, optionally at elevated temperature, subjecting the catalyst to a hydrogen halide treatment, particularly a gas stream comprising hydrogen chloride, under non-oxidative conditions and, optionally at reduced temperature, to at least a two-stage oxidative post-treatment. The catalyst may have been poisoned by sulfur compounds. After the removal of sulfur, the catalyst is subjected to an oxidative post-treatment.

Method for regenerating a toxified catalyst containing ruthenium or ruthenium compounds

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

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Bochum, Germany

Andre Rittermeier