METHOD OF LEATHER PROCESSING Russian patent published in 2012 - IPC C14C3/00 

FIELD: process engineering.

SUBSTANCE: invention relates to leather processing industry. Proposed method comprises pickling leather, tanning by titanium-bearing tanning agent in the presence of cationic fat, alkalising processing solution by neutralising agent in the presence of amino compound, squeezing, planning and retaning. Note here that pickling and retaning are carried out at a time in the presence of nonionic surface active agent and acid protein-degrading enzyme at their amount of 0.1-0.2 wt % and 0.3-0.5 wt % of pelt. Note also that complex titanium aluminium tanning agent is used as titanium-bearing tanning agent at weight ratio of titanium dioxide and aluminium oxide of 1:(0.1-0.3) in amount of 1.6-1.8% of pelt. Note that in alkalising of processing solution, magnesium oxide is used as neutralising agent while ethanolamine borate is used as amino compound in amount of 0.3-0.5% and 0.1-0.2% of pelt weight. In retaning, chromium tanning agent is used in the presence of cationic fat in amount of 1.5-1.7% per chromium oxide and 0.5-0.6 % of planed semi-finished product with additional alkalisation.

EFFECT: intensified process, higher quality of leather.

4 cl, 2 tbl