Basf Aktiengesellschaft

Martin Schmidt-Radde

Franz Merger

Herbert Helfert

Marc Heider

Bernd Eck

Albrecht Dams

Jochem Henkelmann

Michael Hesse

Peter Zehner

Tom Witzel

Matthias Irgang

Harald Rust

Thomas Ruhl

Detlef Kratz

Rudolf Erich Lorenz

Manfred Sauerwald

Martin Brudermueller

Michael Karcher

Gerhard Laqua

Arnold Wittwer

Stephan Scholl

Eckehard Danz

Christoph Übler

J&ouml;rg Heilek

Bernhard Maltry

Klaus Bittins

Ulrich Eiden

Hans-Peter Schildberg

Cristina Freire Erdbr&uuml;gger

Stefan Berg

Jochen Kellenbenz

Martin Bruderm&uuml;ller

Kurt Josef Wagner

Gunter Saladin

A process for working up residues from the preparation of pyrrolidone and/or N-vinylpyrrolidone comprises subjecting the residues to a thermolysis.

Method for processing pyrollidone and n-vinyl pyrollidone residues

The invention describes a process for the isolation of pure N-vinylpyrrolidone from N-vinylpyrrolidone-containing crude products, comprising a single-stage or multistage crystallization process, which comprises passing the mother liquor from the first crystallization stage either to a distillative and/or extractive purification, or returning it to an N-vinylpyrrolidone-containing product stream of the preparation process.

Method for obtaining pure n-vinyl pyrrolidone

Alcohols are prepared by the catalytic hydrogenation of the corresponding carbonyl compounds at elevated temperatures and at superatmospheric pressure in the liquid phase by a process in which the catalyst used contains copper on an SiO,-containing carrier in the presence or absence of one or more of the elements magnesium, barium, zinc and chromium.

Preparation of alcohols

A process for vinylation of an organic acidic-hydrogen compound, which entails reacting an organic acidic-hydrogen compound with acetylene or an acetylene-containing gas under elevated pressure and at elevated temperature in the presence of a base, wherein reactor regions initiating decomposition of acetylene are treated with an effective amount of a chemically inert oil of medium viscosity.

Prevention of spontaneous decomposition of gaseous acetylene

Process for carrying out gas/liquid reactions at from (-50.degree.) to 300.degree. C. and from 0.1 to 100 bar by carrying out the reaction in the absence of a continuous gas phase, and, as a special case, a process for the batchwise reaction of acetylene in the liquid phase at from 0.degree. to 300.degree. C. and from 2 to 30 bar, in which acetylene is introduced a) in the absence of a continuous gas phase and b) under isobaric conditions to a degree of saturation of from 5 to 100%.

Process for carrying out gas/liquid reactions under avoidance of a

The preparation of monovinyl ethers of the general formula I ##STR1## in which A stands for a chemical bond or for a methylene or ethylene group, the radicals R.sup.1 and R.sup.2 independently stand for hydrogen, alkyl, cycloalkyl, or aryl groups or R.sup.1 and R.sup.2 together form a C.sub.3 -C.sub.5 alkylene bridging member, by the reaction of a diol of the general formula II ##STR2## in which the variables have the above meanings, with acetylene in the presence of a base, in which the reaction is carried out at 150.degree.-250.degree. C. under an acetylene partial pressure of 5-25 bar until 40-80% of the diol has been converted, at which point the reaction is stopped and the monovinyl ether of the formula I is isolated.

Preparation of monovinyl ethers

In a process for purifying N-vinylpyrrolidone by crystallization in a crystallizer, those surfaces of the crystallizer from which crystals grow during the crystallization are covered with an N-vinylpyrrolidone seed layer before the crystallization.

Purification of N-vinylpyrrolidone by crystallization

Reaction mixtures obtained in addition reactions of OH-- or NH-- carrying compounds with acetylene or propyne in the presence of alkali metal alcoholates or alkali metal amides are worked up by distilling off the vaporizable components from the reaction mixture in a thin-film evaporator. Before removal of the vaporizable components from the reaction mixture, a particularly defined polyether is added thereto.

Working up reaction mixtures obtained in addition reactions with

N-Vinyllactams of the general formula I ##STR1## where n is from 1 to 3, are prepared by a process which comprises reaction of a lactam of the general formula II ##STR2## where n is from 1 to 3, with from 10 to 90 percent by weight of an aqueous alkali metal hydroxide solution with distillation at from 50.degree. to 250.degree. C. and from 1 to 100 mbar and with a residence time of from 0.1 to 5 hours and subsequent reaction with acetylene at from 60.degree. to 250.degree. C. and from 1 to 100 bar.

Preparation of n-vinyllactams

A process for preparing neopentyl glycol hydroxypivalate by base-catalyzed disproportionation of hydroxypivalaldehyde, wherein the reaction is carried out in the presence of a readily water-soluble alkaline earth metal salt and of an alkali metal hydroxide.

Preparation of neopentyl glycol hydroxypivalate

A process for preparing 3-(hydroxyphenyl)propionaldehydes of the formula I ##STR1## and, where appropriate, for preparing 3-(hydroxyphenyl)propanols of the formula II ##STR2## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.3 -C.sub.20 -cycloalkyl, C.sub.4 -C.sub.20 -alkylcycloalkyl, C.sub.4 -C.sub.20 -cycloalkylalkyl or C.sub.5 -C.sub.20 -alkylcycloalkylalkyl,

Preparation of 3-(hydroxyphenyl)propionaldehydes and their hydrogenation

A process for the preparation of 2,2-bis-hydroxymethyl-butanediol-(1,4) of formula I ##STR1## wherein 4-hydroxybutyraldehyde of formula II ##STR2## and/or 2-hydroxytetrahydrofuran of formula III ##STR3## is/are condensed with formaldehyde in the presence of a basic catalyst and the resulting reaction mixture is then catalytically hydrogenated, and 2,2-bis-hydroxymethyl-butanediol-(1,4) is isolated from the hydrogenation product.

Preparation of 2,2-bis-hydroxymethyl-butanediol-(1,4)

The invention provides a process for the preparation of a 4-halobenzyl alcohol of the formula ##STR1## where R.sup.1 is hydrogen, C.sub.1 - to C.sub.20 -alkyl, C.sub.2 - to C.sub.20 -alkoxyalkyl, C.sub.3 - to C.sub.20 -cycloalkyl, or C.sub.4 - to C.sub.30 -cycloalkylalkyl,

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Beindersheim, Germany

Martin Schmidt-Radde