Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Wolfgang Taugner

Stephan Rautenberg

Wolfgang Boeck

Harald Heinzel

Alexander Möller

Wolfgang Böck

Dietrich Arntz

Willi Hofen

Ralf Goedecke

Raymund Sonnenschein

Joerg Sauer

Hans-Joachim Hasselbach

Udo Gruber

Theo Zarfl

The invention relates to a process for separating acrolein from the process gas of a heterogeneously catalyzed oxidation of propene by means of atmospheric oxygen, wherein high boilers (including acrylic acid) are firstly separated off from the process gas by means of quenching and technical-grade acrolein having small proportions of low boilers is then obtained by means of absorption and subsequent distillation. Small amounts of a solvent by means of which, in particular, oligomers formed are separated off and the tendency for foam to be formed in the apparatuses or columns is reduced is added in the columns and heat exchangers in the work-up process. The solvent is, according to the invention, separated off and recycled in the form of an organic phase in-situ within the existing process.

Method for removing acrolein from the process gas of a heterogeneously catalysed oxidation of propene

The invention provides a process for the removal of polysulfanes from gas streams formed during HS synthesis.

Process for the conversion of polysulfanes

The invention relates to a method for the separation of methyl mercaptan from reaction gas mixtures obtained by means of the catalytic conversion of H2S with methanol, by means of converting the methyl mercaptan into MMP in the presence of the byproducts with acrolein, and separating the same.

Method for the separation of methyl mercaptan from reaction gas mixtures

A process for continuous production of methyl mercaptan by catalytic reaction of methanol and hydrogen sulfide. Significant improvements in the pretreatment of the feed gas mixture and in utilization of the heat of reaction and the heat content of the product gas mixture. The energy required to vaporize the methanol is derived partly from utilization of the heat of compression of the hydrogen sulfide gas and from the heat content of the product gas leaving the reactor. The heat of reaction is utilized to heat the feed gas mixture to the reaction temperature, with the help of an external gas heater.

Process for continuous production of methyl mercaptan

A process for separating the product gas mixture from the catalytic synthesis of methyl mercaptan. Because of improved separation of the product gas mixture into its components, less hydrogen sulfide and methyl mercaptan are lost in discharging the inert gases than in the known process. The inert gases can be burned without after-treatment of the exhaust gas. Likewise, the process water that is discharged is less contaminated with polysulfides.

Process for separating the product gas mixture from the catalytic

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Altenstadt, Germany

Wolfgang Taugner