Patent ID: 11873536
Assignee: BEKEN ITALIA S.R.L.
Field: Chemical engineering (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A process for the tanning of hides which includes the steps of soaking, liming, deliming, maceration, preparation for tanning, and tanning, characterized in that in the step of preparation for the tanning the hides are treated with a liquid mixture consisting of
water in an amount between 40 and 60% by weight with respect to the weight of the hide;
between 0.5 and 2.5% by weight with respect to the weight of the hide of an emulsion containing between 45 and 60% by weight of water and between 40 and 55% by weight of an oil consisting of sulphonates of general formula R—SO3H, wherein R is a C4-C20 alkyl radical;
between 0.2 and 1.5% by weight with respect to the weight of the hide of a mixture of C4-C6 dicarboxylic acids containing between 10 and 30% by weight of succinic acid, between 40 and 60% by weight of glutaric acid and between 15 and 35% by weight of adipic acid;
a salt selected from sodium acetate and sodium formate in an amount between 1 and 2% by weight with respect to the weight of the hide: and optionally an antibacterial component.