Basf Aktiengesellschaft

Waldhelm Hochstein

Gerd Kaibel

Horst Hartmann

Franz-Josef Mueller

Hans Peter Rath

Klaus Bronstert

Hans-Henning Vogel

Gerhard Sandrock

Heinrich Mohr

Organic iodine compounds are separated from carbonylation products of methanol, methyl acetate and dimethyl ether and from mixtures of such carbonylation products by a process wherein the iodine compounds are removed by liquid phase extraction with a non-aromatic hydrocarbon.

Removal of organic iodine compounds from carbonylation products of

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

The processing properties of isobutene polymers when reacted with maleic anhydride are improved by a method in which these polymers are brought into contact, for an effective period,

Quality of isobutene polymers in reactions with maleic anhydride

A process for separating off organic iodine compounds from acetaldehyde-free carbonylation products of methanol, methyl acetate and dimethyl ether by removing the iodine compounds by azeotropic distillation with a hydrocarbon having a boiling point, under atmospheric pressure, of 25-55.degree. C.

Separating off organic iodine compounds from acetaldehyde-free

Liquid mixtures containing aliphatic alcohols are separated, by distillation, into a higher-boiling alcohol-containing fraction and a lower-boiling fraction containing the other liquids, by carrying out the fractionation in the presence of water and of an alkanal and, over about 3/4 of the column height, in the presence of a non-volatile or only slightly volatile acid.

Distillative separation of liquid mixtures containing aliphatic alcohols

A process for separating off organic iodine compounds from acetaldehyde by subjecting the acetaldehyde to azeotropic distillation with a hydrocarbon boiling at from 25.degree. to 55.degree. C. under atmospheric pressure.

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Freinsheim, Germany

Waldhelm Hochstein