Covestro Deutschland Ag

Bayer Materialscience Ag

Lanxess Deutschland Gmbh

Covestro Intellectual Property Gmbh & Co. Kg

Frank Gerhartz

Tim Loddenkemper

Timm Schmidt

Walther Müller

Michael Merkel

Boris Bosch

Andre Rittermeier

Michael Venz

Stefan Hirschfeld

Thomas Burbach

The invention relates to a method for preparing a suspension of a hydrochloride of an organic amine, comprising the following steps of (i) initially charging at least one organic solvent in a reaction vessel to form a liquid level, (ii) adding hydrogen chloride, (iii) adding the organic amine, wherein the organic amine is added below the liquid level present in the reaction vessel and steps (ii) and (iii) are at least partly carried out simultaneously. Furthermore, the present invention also relates to a method wherein the suspension obtained after step (iii) is reacted in a step (iv) with phosgene to obtain the organic isocyanate corresponding to the organic amine used, to the corresponding organic isocyanate and to the use of the organic isocyanate for producing polyisocyanates.

Method for preparing an amine hydrochloride suspension

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

Processes comprising: providing a catalyst comprising a catalytic component selected from the group consisting of ruthenium, ruthenium compounds, and combinations thereof, wherein the catalyst is sulfur-poisoned with one or more sulfur compounds; and treating the catalyst with a gas stream comprising a hydrogen halide under nonoxidative conditions such that the catalyst is regenerated.

Processes for regenerating sulfur-poisoned, ruthenium and/or ruthenium compound-containing catalysts

The present invention relates to a process for preparing mono-N-sulphonylated diamines by reacting diamines with sulphonyl halides in the presence of water, base and organic solvents.

Preparation of mono-N-sulphonylated diamines

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Leverkusen, Germany

Frank Gerhartz