Basf Aktiengesellschaft

Gerhard Sandrock

Franz Merger

Hans Peter Rath

Klaus Volkamer

Max Strohmeyer

Alfred Lindner

Erwin Brunner

Frans Van Deyck

Dieter Hahn

Eddy De Vree

Bart Vander Straeten

Ulrich Mueller

Gerhard Nestler

Klaus Bronstert

Hans-Henning Vogel

Ulrich Wagner

Heinz Hohenschutz

Werner Hefner

Waldhelm Hochstein

Klaus Diehl

Klaus Broellos

Heinrich Mohr

Eckart Schubert

Ralf Weiss

Lothar Sauvage

Ludwig Schroff

Polyisobutene is prepared by cationic polymerization of isobutene and/or isobutene-containing hydrocarbons in the liquid phase in the presence of a complex of BF and at least one cocatalyst which is preferably chosen from oxygen-containing compounds, the BF /cocatalyst complex being produced in situ by adding BF and cocatalyst to a reaction stream, wherein BF and oxygen-containing cocatalyst are added to the reaction stream via a common binary nozzle comprising an outlet for BF and an outlet for the oxygen-containing cocatalyst. The invention also describes a binary nozzle having a centrally arranged outlet for the catalyst.

Method for the production of highly reactive polyisobutenes

Method for producing highly reactive polyisobutenes

Acetaldehyde is removed from C.sub.3 -C.sub.15 hydrocarbons by contacting the hydrocarbon or a hydrocarbon mixture in liquid phase with a zeolite whose pores have a width which is greater than 0.3 nm and up to 0.75 nm.

Removal of acetaldehyde from hydrocarbons

Isobutylene polymers are prepared by polymerizing the monomers at from 0.2 to 20 bar and from -130.degree. and +60.degree. C. in the presence of from 0.01 to 20 mmol of a boron halide catalyst system which contains as cocatalyst a carboxylic anhydride or carbonyl halide, preferably an aliphatic or aromatic, unsubstituted or halogen-substituted C.sub.4 -C.sub.18 -carboxylic anhydride of C.sub.2 -C.sub.12 -carbonyl halide and where appropriate also a customary polymerization accelerant in customary amounts, in the presence or absence of an inert solvent with dissipation of the heat of reaction.

Catalyst systems for the cationic polymerization of isobutylene

A C.sub.4 -hydrocarbon mixture which essentially contains n-butenes and butanes is separated by a process in which

Separation of a C.sub.4 -hydrocarbon mixture essentially containing

A process for conjointly preparing methyl tert.-butyl ether and obtaining isobutene from an isobutene-containing C.sub.4 -hydrocarbon mixture. In the process the C.sub.4 -hydrocarbon mixture is reacted, in one or more etherification stages, with methanol and a primary C.sub.3 - or C.sub.4 -alcohol in the presence of an acid condensing agent, the resulting reaction mixture or mixtures are then separated into a fraction containing the unconverted hydrocarbons, the methyl tert.-butyl ether and a fraction containing the C.sub.3 - or C.sub.4 -alkyl tert.-butyl ether. Thereafter, the C.sub.3 - or C.sub.4 -alkyl tert.-butyl ether is decomposed at an elevated temperature, in the presence of an acid catalyst, into isobutene and primary C.sub.3 - or C.sub.4 -alcohol.

Process for conjointly preparing methyl tert.-butyl ether and obtaining

A process for obtaining isobutene from a C.sub.4 -hydrocarbon mixture containing isobutene, by reacting the mixture with a primary alcohol in the presence of an acid condensing agent and decomposing the resulting tertiary ether in the presence of an acid catalyst at an elevated temperature, wherein a primary C.sub.3 - or C.sub.4 -alcohol is used.

Process for obtaining isobutene from C.sub.4 -hydrocarbon mixtures

p-alkylphenols are manufactured by continuous reaction of phenol with olefins in the presence of a pulverulent polystyrenesulfonic acid ion exchanger which is suspended in the reaction mixture.

Manufacture of p-alkylphenols

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Frankenthal, Germany

Gerhard Sandrock