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US 2017/0233833 A1Published application
Leather Production Using Waste Liquids
OwnerZhuangdou Zhanginventor
Life of this patent
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Abstract
A process for leather production from a raw animal hide includes the steps of pre-soaking, soaking, unhairing and liming, re-liming, deliming and bating, pickling and tanning, degreasing, re-tanning, neutralizing, dyeing and fatliquoring, and washing the processed hide. Waste liquid is collected from at least one of the foregoing steps is recycled to at least one of the foregoing steps. The collected waste liquid can be recycled to the same step, to a different step, or to two of more steps in the process.
Claims14
A process for the production of leather comprising at least one of the following steps:
- (a) pre-soaking a raw hide and collecting the pre-soaking waste liquid;
- (b) soaking the hide and collecting the soaking waste liquid;
- (c) unhairing and liming the hide and collecting the unhairing and liming waste liquid;
- (d) re-liming the hide and collecting the re-liming waste liquid;
- (e) deliming and bating the hide and collecting the deliming and bating waste liquid;
- (f) pickling and tanning the hide and collecting the pickling and tanning waste liquid;
- (g) degreasing the hide and collecting the degreasing waste liquid;
- (h) re-tanning the hide and collecting the re-tanning waste liquid;
- (i) neutralizing the hide and collecting the neutralizing waste liquid;
- (j) dyeing and fatliquoring the hide and collecting the dyeing and fatliquoring waste liquid;
- and
- (k) washing the hide with water and collecting the washing waste liquid,
- wherein the collected waste liquid from the at least one step is recycled to at least one step.
10 more elements
Dependencies are inferred from the claim text.