Evonik Degussa Gmbh

Evonik Roehm Gmbh

Evonik Operations Gmbh

Evonik Rohm Gmbh

Pfeifer & Langen Gmbh & Co. Kg

Olivier Zehnacker

Rolf Schneider

Benjamin Willy

Xinming Wang

Thomas Haas

Thomas Tacke

Achim Marx

Matthias Seiler

Christoph Kobler

Nicole Brausch

Marc Becker

Alexander Schraven

Marc-Christoph Schneider

Dieter Buss

Axel Ronneburg

Christoph Hiller

Eva Maria Wittmann

Katrin Grammann

Jan Wolter

Stefan Münzner

Matthias Bahlmann

Ulrich Bongers

Thomas Hüller

Karl Ludovici

Markus Lütkehaus

Jürgen Haberland

Werner Escher

Gerlind Grimberg

Eva-Maria Wittmann

Gerda Oswald

Manuel Holtkamp

Alexander Mohr

The invention relates to a process for dehumidifying a moist gas mixture. The invention further relates to an apparatus for dehumidifying a moist gas mixture and to the use of said apparatus in the process according to the invention.

Process for dehumidifying moist gas mixtures

Method for dehumidifying humid gas mixtures using ionic liquids

The invention relates to a process for purifying an ionic liquid comprising dialkylimidazolium ions by means of stripping, wherein water vapor is used at a particular temperature. The process according to the invention is characterized in that the decomposition of the ionic liquid is minimized during the procedure of the process.

Process for purifying an ionic liquid

The invention relates to a process for dehumidifying a moist gas mixture in which the moist gas mixtures are brought into contact with an absorbent comprising dialkylimidazolium salts and trialkyl phosphate. In addition, the invention also relates to an absorption heat pump comprising the absorbent according to the invention and to the absorbent according to the invention itself.

Process and absorbent for dehumidifying moist gas mixtures

The present invention encompasses a novel method for synthesizing highly pure salts of the general formula QA, wherein Qis: and wherein Ais 

Method of preparing a high purity imidazolium salt

The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.

Method for producing a free acid from the salt thereof

A process for the preparation of free carboxylic acids including: A) preparation of carboxylic acid by a biological cell located in an aqueous medium with addition of an amine of formula (I) where R, Rand R, independently of one another, are identical or different, branched or unbranched, optionally substituted hydrocarbon radicals or H; B) for cases where the added amine A) is water-soluble, addition of a water-insoluble amine of formula (I), where, in A) or B), a multiphase system is obtained and the corresponding ammonium carboxylate is formed from the water-insoluble amine and the carboxylic acid; C) removal of the water-insoluble phase; and D) heating of the water-insoluble phase with release of free carboxylic acid.

Method for the production of free carboxylic acids

The invention relates to an operating medium for an absorption refrigeration device, comprising 5 to 30 wt % water and 65 to 95 wt % of a sorption agent comprising lithium bromide and at least one ionic liquid and wherein the sorption agent comprises ionic liquid and lithium bromide in a weight ratio of 0.5:1 to 5:1, having a lower friction coefficient compared to an operating medium comprising water and lithium bromide.

Operating medium for an absorption refrigeration device

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Dortmund, Germany

Olivier Zehnacker