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Featured researches published by Fritz Thiessen.


Archive | 1988

Preparation of methacrylic acid

Richard Dr. Krabetz; Gerd Duembgen; Franz Merger; Michael Jaeger; Fritz Thiessen; Herbert Vogal


Archive | 1978

Catalyst for the oxidation of acrolein and methacrolein to acrylic acid and methacrylic acid, respectively

Richard Dr. Krabetz; Walter Herrmann; Norbert Scholz; Heinz Dipl Chem Dr Engelbach; Gerd-Juergen Dipl Chem Engert; Carl-Heinz Willersinn; Gerd Duembgen; Fritz Thiessen


Archive | 1975

Acrylic acid prepn. by oxidn. of propylene - in a tubular reactor contg. two different catalysts utilising cooling media at different temps.

Heinz Dipl Chem Dr Engelbach; Richard Dr. Krabetz; Gerd Duembgen; Ulrich Dr Lebert; Fritz Thiessen; Horst Dipl Ing Schauer; Gerd-Juergen Dipl Chem Engert


Archive | 1972

Recovering anhydrous acrylic acid

Gerd Duembgen; Heinz Dipl Chem Dr Engelbach; Walter Dr Frey; Richard Dr. Krabetz; Ulrich Dr Lebert; Hermann Dipl Ing Spitzl; Fritz Thiessen; Carl-Heinz Willersinn


Archive | 1992

Compositions of the formula MO12 Pa Vb X1c X2d X3e Sbf Reg Sh On

Karl-Heinz Boehning; Gerd Duembgen; Ulrich Hammon; Richard Dr. Krabetz; Franz Merger; Matthias Dr. Schwarzmann; Fritz Thiessen; Herbert Vogel


Archive | 1976

Katalysator fuer die oxidation von (meth)acrolein zu (meth)acrylsaeure

Richard Dr. Krabetz; Walter Herrmann; Norbert Scholz; Heinz Dipl Chem Dr Engelbach; Gerd-Juergen Dipl Chem Engert; Carl-Heinz Dipl Che Willersinn; Gerd Duembgen; Fritz Thiessen


Archive | 1991

Masses with the general formula

Karl-Heinz Boehning; Gerd Duembgen; Ulrich Hammon; Richard Dr. Krabetz; Franz Dr. Merger; Mathias Dr. Schwarzmann; Fritz Thiessen; Herbert Vogel


Archive | 1975

Method of separating high-boiling or non-volatile materials

Heinz Dipl Chem Dr Engelbach; Richard Dr. Krabetz; Gerd Duembgen; Carl-Heinz Willersinn; Walter Dr Frey; Ulrich Dr Lebert; Fritz Thiessen


Archive | 1975

Manufacture of acrylic acid by oxidation of propylene with oxygen-containing gases in two separate catalyst stages

Heinz Dipl Chem Dr Engelbach; Richard Dr. Krabetz; Gerd Duembgen; Carl-Heinz Willersinn; Ulrich Dr Lebert; Fritz Thiessen


Archive | 1974

Verfahren zum abtrennen schwer- oder nichtfluechtiger nebenprodukte der propylen- und/oder acroleinoxidation von den fuer die absorbtion der acrylsaeure aus den reaktionsgasen verwendeten loesungsmitteln

Heinz Dipl Chem Dr Engelbach; Richard Dr. Krabetz; Gerd Duembgen; Carl-Heinz Dipl Che Willersinn; Walter Dr Frey; Ulrich Dr Lebert; Fritz Thiessen

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