C - Chemistry – Metallurgy – 01 – C
Patent
C - Chemistry, Metallurgy
01
C
8/67, 23/85
C01C 1/242 (2006.01) C01G 1/10 (2006.01) C01G 23/00 (2006.01) C14C 3/02 (2006.01) C14C 3/04 (2006.01)
Patent
CA 1152284
Abstract of the Disclosure The present invention relates to methods for prepar- ing a titanium tanning agent from sulphuric-acid titanium- ferriferous solutions and use thereof for leather tanning. The method for preparing a titanium tanning agent from titanium-ferriferous sulphate solutions comprises introduc- tion, into said solution, of an oxidizing agent comprising a sulphuric-acid solution of a peroxy-titanium complex, fol- lows by the addition of ammonium sulphate and sulphuric acid to precipitate a double salt of titanyl and ammonium sulphate in the monohydrate form (NH4)2TiO(SO4)2.H2O. The precipita- tion of this salt is preferably effected prior to its forma- tion in an amount of 75-85% based on TiO2. The resulting salt is separated and washed; the filtrate and washings are com- bined and treated with ammonium sulphate to afterprecipitate the salt which is separated and recycled into the starting so- lution. The thus-prepared salt is used for tanning hides pre- treated with a tanning promotor: sodium salt of disulphodina- phthylmethane or phthalic anhydride, or aluminium alum, or a mixture of aluminium alum with urotropin; ammoniumtitanylsul- phate or phenol oligomers dispersed in lignosulphonic acids. Tanning of delimed, or delimed and pickled, or delimed pickled and chromed bides is effected using the titanium tann- ing agent in the presence of lactic acid, aluminium alum or products of condensation of synthetic fatty acids with tri- ethanolamine. The present invention is useful in the leather indust- ry
351291
Babkin Artur G.
Belokoskov Valentin I.
Gerasimova Lidia G.
Godneva Maria M.
Kolesnikova Nina I.
Institut Khimii I. Tekhnologii Redkikh Elementov I. Mineralnogo
Marks & Clerk
Tsentralny Nauchno-Issledovatelsky Institut Kozhevenno-Obuvnoi P
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