Metallic salts which are difficult to dissolve in water, a...

Details Metallic salts which are difficult to dissolve in water, a... Metallic salts which are difficult to dissolve in water, a...

C - Chemistry, Metallurgy

07

C

C07C 327/18 (2006.01) C25D 3/46 (2006.01)

Patent

CA 2249533

The invention concerns metallic salts of formula (I) which are difficult to dissolve in water, R1 and R2, which are identical or different, designating hydrogen or a lower alkyl group with between 1 and 3 carbon atoms, M being the cation of a metal which forms sulphides which are difficult to dissolve in water, and n meaning 1 or 2. The invention also concerns mixtures of these metallic salts. The metallic salts and their mixtures are produced by reacting carbon disulphide with ketones of formula (II), optionally with the addition of non-aqueous inert solvents and strong alkali, preferably potassium hydroxide, whereupon, by adding aqueous solutions of metallic salts of the metals M, the metallic salts of formula (I) which are difficult to dissolve in water are precipitated out. These salts are used as brighteners for electrolytic baths.

L'invention concerne des sels métalliques solubles dans l'eau de la formule (I) dans laquelle R¿1? et R¿2? sont identiques ou différents et désignent hydrogène ou un groupe alkyle ayant entre 1 et 3 atomes de carbone, M désigne le cation d'un métal qui forme des sulfures difficilement solubles dans l'eau et n vaut 1 ou 2. L'invention concerne également des mélanges desdits sels métalliques, obtenus par réaction de sulfure de carbone avec des cétones de la formule (II), éventuellement sous apport de solvants inertes non aqueux et d'alcali fort, de préférence d'hydroxyde de potassium, à la suite de quoi les sels métalliques difficilement solubles dans l'eau de la formule (I) sont précipités, sous apport de solutions aqueuses de sels métalliques des métaux M. Ces sels métalliques s'utilisent comme brillanteurs ajoutés aux bains électrolytiques.

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