Bayer Aktiengesellschaft

Dorde Jovcic

Paul Wagner

Hans-Joachim Traenckner

Winfried Joentgen

Torsten Groth

Klaus Schubert

Herbert Emde

Harald Gleinig

Klaus Geisler

Friedrich Durholz

Dietmar Mayer

Jurgen Lahrs

Bernd Krumbach

Claus Gosling

Reiner Skerhut

Roland Busse

Heinz Heumuller

In a process for the continuous preparation of polymers with repeating succinyl units, maleic anhydride or a derivative thereof as educt A is mixed with ammonia or an ammonia-producing compound or amides of carbonic acid as educt B and in a first reaction stage these are reacted to give an N-containing low molecular derivative of maleic acid. This derivative is then polymerized in a subsequent second reaction stage. Reaction of the educts (A,B) takes place largely adiabatically in the first reaction stage. The heat of reaction thereby released is used to take the reaction mixture to the polymerization temperature and in the second reaction stage at least partially to polymerize the N-containing low molecular derivative to obtain a polymer with repeating succinyl units.

Process for preparing polymers which contain aspartic acid

The invention relates to an improved process for the preparation of polysuccinimide from maleic anhydride and ammonia, characterized in that the starting compounds are brought to reaction in liquid form in a tubular reactor with feed nozzle at temperatures of preferably 50.degree. C. to 500.degree. C. and residence times of preferably 0.1 to 600 seconds and the resulting reaction mixture is possibly further polymerized thermally in a high-viscosity reactor preferably continuously operated at 120.degree. C. to 300.degree. C.

Process for the preparation of polysuccinimide

A process for preventing the caking of particles of ammonium bifluoride and/or ammonium fluoride salt mixtures or salts subjected to the action of temperature, pressure and/or moisture, the process comprising spraying on said particles a solution comprising a primary, secondary or tertiary amine carrying an alkyl group with 8 to 25 carbon atoms.

Process for preventing caking of ammonium bifluoride and/or fluoride

Reactions of liquid starting substances to give chemical compounds in which these chemical compounds are obtained as solids can be carried out by spraying the liquid starting substances from separate nozzles such that the liquid starting substances are mixed in the spray cones, which penetrate one another, and thereby react.

Process for the preparation of chemical compounds obtained as solids

Pulverulent preparations with a low dust content, in particular dyestuff powders, are obtained when the customary dustproofing agents are not added before the drying process and also are not sprayed directly onto the product to be dustproofed, but are allowed to act on the pulverulent product in the form of an aerosol. The average particle size of the aerosol is less than 10.mu..

Process for the manufacture of preparations with a low dust content

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Burscheid, Germany

Dorde Jovcic