METHOD OF PROCESSING SHEEPSKIN Russian patent published in 2013 - IPC C14C1/08 

FIELD: chemistry.

SUBSTANCE: method involves soaking, first and second defatting in aqueous solution of an anionic surfactant and a preparation containing an oxyethylated compound, polyvinyl alcohol and a saturated monoatomic C₁-C₃ alcohol in ratio of 60:20:20, respectively; pickling in the presence of the preparation in amount of 2.0-3.0 g/l; tanning-oiling is carried out in a treatment solution containing sodium chloride; the oiling agent and chrome tanning agent are used in amount of 1.0-1.4 g/l per content of chromium oxide, in which before adding the chrome tanning agent, aluminium hydroxochloride and sodium formate are further added in amount of 10.0-14.0 g/l and 2.0-3.0 g/l, respectively. First defatting is carried out with amount of the anionic surfactant and the preparation of 2.0-3.0 g/l each; second defatting is carried out with amount of the anionic surfactant and the preparation of 3.0-4.5 g/l and 1.0-1.5 g/l, respectively; aluminium hydroxochloride is added in two equal portions with an interval of 50-60 min; the chrome tanning agent is added 4.0-5.0 hours after adding sodium formate.

EFFECT: improved quality of a half-finished product made from sheepskin owing to high strength thereof, reduced contamination of factory sewage with chromium compounds and high environmental safety of fur production.

5 cl, 1 tbl, 5 ex