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Friedhelm Steffens

Bayer

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Publication

Featured researches published by Friedhelm Steffens.

Archive | 2002

Process for purification of anhydrous hydrogen chloride gas

Bill Brady; Guenther Dipl Phys Dr Weymans; Berthold Keggenhoff; Friedhelm Steffens

Archive | 2003

Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column

Bill Brady; Friedhelm Steffens; Berthold Keggenhoff; Kai Verkerk; Gerhard Ruffert

Archive | 2007

Method for manufacturing isocyanates in the gaseous phase

Fritz Dr. Pohl; Klaus Dr. Biskup; Rainer Bruns; Friedhelm Steffens; Herbert Dr. Stutz

Archive | 2003

Method for refining mixture of toluene diisocyanate by using distillation column having partitioned wall

Bill Brady; Berthold Keggenhoff; Gerhard Ruffert; Friedhelm Steffens; Kai Verkerk; カイ フェアケルク; ゲルハルト・ルッフェルト; ビル・ブレイディ; フリードヘルム・シュテッフェンス; ベルトルト・ケッゲンホーフ

Archive | 2010

Process for the preparation of toluene-diisocyanate

Wolfgang Lorenz; Lars Dr. Padeken; Bernd Pennemann; Friedhelm Steffens; Lothar Weismantel

Archive | 1986

Method of liquid-liquid extraction using material exchange columns

Hans-Walter Brandt; Friedhelm Steffens; Johannes-Peter Schäfer; Jürgen Schröter

Archive | 2005

Process for the distillative separation of aqueous amine solutions

Friedhelm Steffens; Rainer Dr. Buse; Bill Brady

Archive | 2005

Process for separation of aqueous amine solutions by distillation

Bill Brady; Rainer Dr. Buse; Friedhelm Steffens

Archive | 2008

Method for manufacturing aromatic diisocyanates in the gaseous phase

Klaus Dr. Biskup; Rainer Bruns; Lars Dr. Padeken; Fritz Dr. Pohl; Friedhelm Steffens

Archive | 2007

Process for the production of the toluene diisocyanate

Joachim Zechlin; Bernd Pennemann; Friedhelm Steffens; Ji Wenbin

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Berthold Keggenhoff

Bayer

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Lars Dr. Padeken

Bayer

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Wolfgang Lorenz

Bayer

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Fritz Dr. Pohl

Bayer

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Bernd Pennemann

Bayer

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Rainer Bruns

Bayer

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Rainer Dr. Buse

Bayer

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Klaus Dr. Biskup

Bayer

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Gerhard Ruffert

Bayer

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Andreas Hecking

Bayer

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