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Thelen; Gerhard
Nottuln, DE
No. of patents:

Patent Number Title Of Patent Date Issued
5773622 Continuous process for the preparation of 4-amino-2,2,6,6-tetramethylpiperidine June 30, 1998
A process for the continuous preparation of 4-amino-2,2,6,6-tetramethylpiperidine (TAD), comprising: passing triacetoneamine, ammonia and hydrogen over a catalyst of at least two layers in a reactor, wherein at least one catalyst layer comprises at least one element of the 4th, 5th,
5693817 Solvent-free process for preparing 4-amino-2,2,6,6-tetramethylpiperidine December 2, 1997
A process for preparing 4-amino 2,2,6,6-tetramethylpiperidine (TAD) from 2,2,6,6-tetramethylpiperidone (TAA), ammonia and hydrogen using a cobalt or nickel catalyst on a support which allows the omission of any added solvent, and provides substantially simplified work-up and increased
5578546 Catalyst for preparing bis-para-aminocyclohexylmethane containing a low proportion of trans/tran November 26, 1996
A catalyst for preparing bis-para-aminocyclohexylmethane by hydrogenation of methylenedianiline, comprising ruthenium or rhodium in an amount of from 0.05 to 8% by weight, applied in a layer thickness of from 5 to 150 .mu.m to a support comprising a calcined and surface-rehydrated transi
5391750 Process for the preparation of 4-hydroxy-2,2,6,6-tetramethylpiperidine February 21, 1995
The present invention relates to a process for the preparation of 4-hydroxy-2,2,6,6-tetramethylpiperidine by heterogeneous catalytic hydrogenation of 4-oxo-2,2,6,6-tetramethylpiperidine in a melt or solution at temperatures of C. to C. and hydrogen pressures of
5132270 Ultrasound method of reactivating deactivated hydrogenation catalyts July 21, 1992
Deactivated hydrogenation catalysts of ruthenium metal deposited on an aluminum oxide support are regenerated by treatment with ultrasound.
4960959 Process for the manufacture of alkynediols by reaction of ketones with acetylene October 2, 1990
A process for manufacturing an alkynediol is disclosed. In this process, a C.sub.3-12 ketone is reacted with acetylene in the presence of potassium hydroxide in an C.sub.1-4 alkyl-tert-butyl ether solvent. The potassium hydroxide is used in a molar ratio, relative to the amount of ketone
4912271 Process for the manufacture of vinyl chloride by reaction of acetylene with hydrogen chloride March 27, 1990
Vinyl chloride is prepared by reacting acetylene with hydrogen chloride in the presence of a palladium compound catalyst in a solvent of an aliphatic and/or cycloaliphatic carboxylic acid amide at temperatures higher than room temperature.

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