CONTINUOUS PRODUCTION OF DIAMINODICYCLOHEXYLALKANES

摘要

1,218,426. Diaminodicyclohexyl alkanes. BADISCHE ANILIN- & SODA FABRIK A.G. 7 June, 1968 [10 June, 1967], No. 27220/68. Heading C2C. Diaminodicyclohexyl alkanes are made by the continuous hydrogenation of diaminodiphenyl alkanes at above 180‹ C. and a pressure above 50 atm. in the presence of a catalyst containing cobalt, the catalyst containing less than 0À5% by weight of copper and the reaction mixture containing less than 0À4% of water. A solvent may be present. The preferred starting materials have the formula in which R1 denotes an alkylene or alkylidene radical of 1-4 carbon atoms and R2, R3 and R4 denote hydrogen atoms or alkyl radicals of 1-4 carbon atoms. The catalyst may contain activators, e.g. manganese or chromium, and may also contain alkali-metal salts having an alkaline reaction in aqueous solution; it may be unsupported or used on a carrier. Examples are given of the manufacture of diaminodimethyldicyclohexyl methanes from diaminoditolylmethanes. Other specified starting materials include 4,41- diaminodiphenylpropane - (2,2), N,N1 - dibutyl- 4,41 - diaminodiphenylmethane and 2,21- diaminodiphenylmethane.