Chemische Werke Huels Aktiengesellschaft

Chemische Werke Huls Aktiengesellschaft

Manfred Schroeder

Gunther Maahs

Alfred Coenen

Wolfgang Zaar

Wolfgang Schaefer

Guenter Prominski

Copper(II) chloride is prepared from copper(II) oxychloride in a nonpolar solvent, preferably during oxychlorination. As the source of hydrogen chloride, the hydrochlorides of certain tertiary amines having 12-40 carbon atoms in total are utilized. The amine contains at most one N-methyl group and its dissociation constant K.sub.a of the equilibrium reaction

Process for the production of copper (II) chloride from copper (II)

A process for preparing a copolymer by copolymerizing ethylene and at least one other 1-monoolefin and, optionally, and unconjugated diene in the presence of a mixed catalyst of (1) a compound of a metal of main Groups I-III of the periodic table having at least one hydrogen atom or an alkyl or aryl group bound to the metal atom, and (2) a compound of a metal of Subgroups IV-VI of the periodic table, comprises performing the copolymerization in the presence of an amount effective as an activator of a 2, 3,4,4-tetrachloro-2-butenoic acid ester of the fromula

Preparation of copolymers of ethylene with at least one other

A process for the production of squaric acid, comprising reacting hexachlorocyclobutene with 70-96% by weight sulfuric acid at 80.degree.-150.degree. C.

Process for the production of squaric acid

A process for the production of pure diglycolic acid by oxidation of diethylene glycol with nitric acid, comprises the steps of: A. cooling the reaction mixture formed during the oxidation to a temperature of -10.degree. to +25.degree. C. and separating a first quantity of thus-crystallized diglycolic acid; B. concentrating the first mother liquor at 5 - 530 millibars to a concentration of 35-45% by weight of HNO.sub.3 and cooling to a temperature of -10.degree. to +25.degree. C.; c. separating a further quantity of thus-crystallized diglycolic acid; and D. recycling the remaining second mother liquor to the reactor for oxidizing diethylene glycol with nitric acid.

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Marl, Germany

Manfred Schroeder