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

Claim 7:
8. The process according to claim 1, wherein the deliming step is carried out at a temperature between 30 and 38° C. in two successive phases, each carried out with an amount of water equal to the weight of hide to be treated, by draining the water between one phase and the next, and in which the second phase is carried out at a higher temperature than the first one, in an overall time between 3 and 4 hours, further comprising in at least one of the two phases:
between 0.8 and 1.5% with respect to the weight of the hide in the case of split hides, and between 1.5 and 3% with respect to the weight of the hide in the case of non-split hides, of a mixture containing between 40 and 45% of ammonium chloride (NH4Cl), between 20 and 30% of one or more C4-C6 dicarboxylic acids, and between 0.5 and 1.5% of sulfamic acid (H2NSO3H), with the balance to 100% consisting of ammonium sulphate (NH4SO4H);
between 0.4 and 1.0% with respect to the weight of the hide of ammonium sulphate; and
between 0.3 and 1.5% with respect to the weight of the hide of a degreaser.