Huels Aktiengesellschaft

Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Guenther Koehler

Manfred Neumann

Josef Metz

Wolfgang Kleemiss

Marcel Feld

Frank Bauer

Ulrich Simon

Clemens Osterholt

Marianne Omeis

Michael Korell

Johannes Ruwwe

Thomas Kuebelbaeck

Karl-Heinz Bruehl

Juergen Chlench

Wilfried Uhlenbrock

A continuous process for decarboxylating carboxylic acids proceeds by I.) initially charging a carbonyl compound as a catalyst in a solvent at reaction temperature, to obtain a catalyst solution; II.) metering a carboxylic acid into the catalyst solution as an aqueous solution, aqueous suspension or as a water-comprising solid, to obtain a reaction mixture; and III.) continuously removing a mixture of CO, solvent, water and a reaction product or mixture of reaction products from the reaction mixture as a vapor.

Continuous process for decarboxylating carboxylic acids

A microencapsulated adhesive component, comprising a cross-linking constituent microencapsulated with a silanized polybutadiene, wherein the reactive constituent has been first reacted in the melt with cross-linking, thereby resulting in a cross-linkable hot-melt adhesive component for coating and/or laminating surface formations.

Crosslinking base layer for fixing interlinings according to double dot and paste process

Preparation of 2-chloro-1,1,1-trialkoxyethane

Process for preparing amino derivatives of C-H-acid compounds

Process for preparing hydroxybenzoic esters of oxo alcohols

A process for the preparation of macrocyclic esters or lactones in a two-stage reaction, which entails effecting linear oligomerization of monomers having a number of carbon atoms corresponding to the macrocycle and effecting cyclizing deoligomerization, wherein both steps are conducted in the presence of a complex compound of trivalent iron.

Process for the preparation of macrocyclic esters or lactones

A process for the preparation of cyclic esters of the general formula: ##STR1## in which m is an integer from 6-14 and n is an integer from 2-6, which comprises heating a dicarboxylic acid bis(glycol) ester of the general formula:

Process for the preparation of cyclic esters

A process for preparing high-purity cyclopropyl methyl ketone from compositions which contain cyclopropyl methyl ketone, 4,5-dihydro-2-methylfuran, addition products of 4,5-dihydro-2-methylfuran by a continuous rectification process in which at least a portion of the composition to be purified is introduced into a rectification apparatus via a side feed located above the bottom portion of the apparatus.

Process for preparing high-purity cyclopropyl methyl ketone

A method is provided for the preparation of 2-acetyl-.gamma.-butyrolactone by condensing .gamma.-butyrolactone with an acetic acid ester in the presence of a strongly basic condensation agent, followed by protonation of the initially formed enolate, wherein the .gamma.-butyrolactone, the acetic acid ester and the condensation agent are fed continuously into the reaction zone in a ratio of from 1.0 to 6.0 parts by mols of acetic acid ester and from 0.9 to 1.6 parts by mols of the strongly basic substance per part by mols of .gamma.-butyrolactone, and wherein the reaction mixture formed by condensation is withdrawn from the reaction zone, either batchwise or continuously, and protonated.

Method for preparing 2-acetyl-.gamma.-butyrolactone

A process is provided for preparing diesters of higher .alpha.,.omega.-dicarboxylic acids from cycloaliphatic ketones and carbonic diesters in the presence of a strongly basic agent, which involves continuously feeding a cycloaliphatic ketone having 8 to 20 ring members, at least an equimolar amount of a carbonic diester and a catalytic amount of a strongly basic agent to a reaction zone in which condensation occurs between the cycloaliphatic ketone and the carbonic diester to give the corresponding cyclic .beta.-keto acid ester enolate, which is then ring-opened by the released alcohol to give the .alpha.,.omega.-dicarboxylic diester and from which reaction mixture is continuously taken off.

Process for preparing diesters of higher .alpha.,.omega.-dicarboxylic

Process for the preparation of macrocyclic compounds by condensation of at least difunctional compounds and subsequent thermal depolymerization in the presence of catalysts, wherein thermal depolarization is carried out in solvent of the formula ##STR1## where R.sup.1 and R.sup.2 represent identical or different aliphatic C.sub.1-6 hydrocarbon radicals with or without functional groups and having number average molecular weights (Mn) from 500 to 3,000, from which the value of n inevitably follows, at a pressure of less than 50 hPa and at a temperature of 200 to 300.degree. C., 5 to 1,000 parts by weight of solvent being used per part by weight of macrocyclic compound.

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Marl, Germany

Guenther Koehler