Basf Aktiengesellschaft

Basf Se Corporation

Hagen Weigl

Andreas Kramer

Manfred Winter

Klaus Ebel

Steffen Maas

Hans-Joachim Haehnle

Michael Koch

Gerhard Schulz

Matthias Dernbach

Hans-Joachim Hähnle

Alexander Wartini

Gisela Hieber

Process for the preparation of N-vinylcarboxamides by pyrolysis of a compound of the formulaCH&#x2014;CH(CN)&#x2014;N(R)&#x2014;CO&#x2014;R&#x2003;&#x2003;(I),

Process for the preparation of N-vinylcarboxamides

A process for the hydrolysis of polymers comprising vinylcarboxamide units by heating polymers comprising vinylcarboxamide units in an aqueous medium in the presence of acids or bases, wherein an aqueous solution or dispersion of a polymer comprising vinylcarboxamide units and an aqueous solution or a base or acid are fed continuously to a tubular reactor at elevated pressure, from 0.05 to less than one equivalent of a base or acid being used per vinylcarboxamide equivalent and the mixture being passed through the tubular reactor at a temperature of &#x3e;100&#xb0; C. to 250&#xb0; C., depressurized and cooled.

Process for hydrolyzing polymers containing vinylcarboxamide units

A process for removing carbonaceous deposits on surfaces of catalysts and plant parts by treating the deposits with a superheated stream of steam admixed at least temporarily with an oxygenous gas is provided, which involves, in each case monitoring the offgas COcontent after condensation of the steam, at a temperature of at least 300&#xb0; C.: (a) treating the carbonaceous deposits with superheated steam at a temperature of at least 300&#xb0; C. until the COcontent of the offgas has exceeded a maximum; (b) then, with further supply of superheated steam, commencing oxygen supply, the amount of oxygen supplied being adjusted such that the COcontent in the offgas decreases further until it has fallen to a value of &#x3c;1% by volume; and then (c) ending the supply of superheated steam and passing an oxygenous gas over remaining amounts of carbonaceous deposits until the deposits have been virtually removed.

Process for removing carbonaceous deposits on surfaces of catalysts and plant parts

The invention relates to a method for producing macrocyclic ketones of general formula (I) by direct cyclisation of compounds of general formula (II) in the gas phase on a heterogeneous catalyst. In general formula (I), X represents a monounsaturated or polyunsaturated or saturated C&#x2013;Calkyl radical which can be optionally substituted by a C&#x2013;Calkyl radical, and in general formula (II), R, Rcan respectively be the same or different and represent hydrogen or C&#x2013;Calkyl, and has the above-mentioned designation. 

Method for producing macrocyclic ketones by means of dieckmann codensation in the gas phase

A process for the preparation of imidazo[1,2-a]-5,6,7,8-tetra hydropyridin-8-ones by reaction of &#x3b3;-butyrolactones with imidazols, novel imidazo[1,2-a]-5,6,7,8-tetrahydropyridin-8-ones, and their use for the preparation of imidazo[1,2-a]pyridines are described.

Substituted imidazo[1, 2-a]-5,6,7,8-tetrahydropyridine-8-ones, method for their production and the use thereof for producing imidazo[1,2-a]pyridines

In a process for the catalytic hydrogenation of a polymethylolalkanal or a monomethylolalkanal of the formula (I) where R may be identical or different and are each a substituted or unsubstituted aliphatic hydrocarbon having from 1 to 22 carbon atoms, an aryl or arylalkyl group having from 6 to 22 carbon atoms or a methylol group, in the presence of a copper-containing catalyst, the hydrogenation feed comprising the polymethylolalkanal or monomethylolalkanal has a total content of metal ions of groups 3 to 14 of the Periodic Table of the Element of up to 5 ppm.

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Ladenburg, Germany

Hagen Weigl