Basf Aktiengesellschaft

Daimler Chrysler Ag

Universital Dortmund

David Agar

Hugo Fuchs

Gerald Neubauer

Rolf Hartmuth Fischer

Franz Merger

Tom Witzel

Josef Ritz

Otto Watzenberger

Uwe Vagt

Hans Volkmar Schwarz

Andreas Docter

Gerhard Laqua

Hans H Schuster

Paul-Michael Bever

Joerg Therre

Marc Sommer

Ursula Siebenhaar

Zhang Xiaohui

Martin Gosewinkel

Yudy Halim Tan

The present invention relates to a process for separating off COfrom a gas stream, wherein in a second step the COis removed from the CO-absorbing agent by means of phase separation.

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A fuel cell method and apparatus includes upstream reforming of hydrocarbons and/or alcohols, with water contained in the exhaust air stream of the fuel cell system being recovered. An absorption unit is connected into the exhaust air stream of the fuel cell, and water absorbed therein is released in a desorption unit, preferably by means of heated air to be supplied, and/or by heating the glycol solution. The moist air can subsequently be returned to the fuel cell system or the reforming unit. This makes it possible to recover all of the process water, and to operate the system at low pressure.

Fuel cell system with device for water recovery and method of operating such a system

Recuperative heat exchangers or regenerative heat exchangers are used for the thermal decomposition of N,O in N,O-containing gases. The process for the thermal decomposition of N,O in N,O-containing gases at from 800 to 1200&deg; C. comprises passing the N,O-containing gas through one or more recuperative heat exchangers or regenerative heat exchangers in such a way that when the gas to be reacted is passed through a charge of heat transfer material it is heated to a temperature in the range from 800 to 1200&deg; C. and the N,O present is decomposed thermally, and cooling the reacted gas by heat exchange so as to heat the charge of heat transfer material and the gas to be reacted.

Thermal decomposition of N2O

(Cyclo)aliphatic polyisocyanate compositions which have a long shelf life, are obtainable by phosgene-free methods, preferably by thermal cleavage of (cyclo)aliphatic polycarbamates, and, for stabilization, contain at least one primary stabilizer (2a), preferably a sterically hindered phenol and/or an aromatic amine, or at least one secondary stabilizer (2b), preferably an organic phosphite and/or a thioether, or at least one acidic stabilizer (2c), preferably a carboxylic acid, an acyl chloride, an inorganic acid, an inorganic acid chloride and/or a diester of phosphoric acid, or a stabilizer system comprising at least 2 of the stabilizers (2a) to (2c), a process for the preparation of the (cyclo)aliphatic polyisocyanate compositions and their preferred use for the preparation of isocyanurate-containing polyisocyanates.

Polyisocyanate compositions having a long shelf life and obtainable by

The invention relates to a method of reacting alkyl carboxylate chlorides and/or carboxylic dichlorides dissolved in corresponding diaikyl carboxylates with the corresponding alkanol at temperatures ranging from 60.degree. to 300.degree. C., in which the resultant hydrogen chloride remains in the reaction mixture.

Method of reacting carboxylic chlorides dissolved in carboxylates

The preparation of cyclohexene oxide, cyclohexanol and cyclohexanone involves

Cyclic preparation of cyclohexene oxide, cyclohexanol and cyclohexanone

Caprolactam is purified continuously by passing a 75-95% strength by weight aqueous caprolactam solution together with hydrogen at 50.degree.-95.degree. C. and 1.5-100 bar upward through a fixed-bed supported palladium or nickel catalyst in a tubular zone while maintaining a residence time of from 10 to 100 min.

Continuous purification of caprolactam

Hydroxylammonium salts are eliminated from wastewaters containing such salts by a process which comprises treating a wastewater containing such salts with not less than 0.5 mole of manganese (IV) oxides per mole of hydroxylamine in the form of hydroxylammonium salts at a pH of from 1 to 4 and at from 10.degree. to 100.degree. C.

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Dortmund, Germany

David Agar