METHOD FOR PRODUCTION OF TITANIUM TANNING AGENT FOR LEATHER Russian patent published in 1997 - IPC

FIELD: leather industry. SUBSTANCE: chlorine-containing titanium sulfate is dissolved in water, the process takes place till concentration of titanium, sulfate ion and chlorine ion is 80-140 g/l, 180-340 g/l and not more 65 g/l respectively. Thus prepared solution is mixed and cooled, then two-stepped salting out of ammonium sulfatotitanium is carried out. At the first step solid ammonium sulfate is added into solution, its quantity is 30-40 % of total value, rate of salting out is 0.22-0.27 kg/s. At the second step solid ammonium sulfate is added into solution, its quantity being 70-60 % of total value, rate of salting out is 0.6-0.07 kg/s. EFFECT: improved efficiency of the method. 2 tbl