METHOD OF TREATMENT OF COLLAGEN-CONTAINING RAW MATERIAL Russian patent published in 2008 - IPC C14C13/00 C14C1/00 C08H1/06 

FIELD: leather industry; treatment of collagen-containing raw material of fish skin formed in the course of dressing.

SUBSTANCE: waste of fish skin treatment process in leather and fishing industries is frozen, ground in pieces of 20x20 mm, defrosted by washing with tap water which is changed for two or three times; washing is continued for 2 hours at temperature of 18-20 C. Then pieces of waste are treated with solution containing 2-4-% CH₃OOO at volume ratio equal to 5 and are kept in solution at regular mixing for 12 hours at temperature of 18-20 C. After treatment, solution is drained. Collagen thus obtained is washed with running water for 30 minutes at temperature of 18-20 C. After washing, collagen is dissolved in alkaline salt bath for 4 hours: 2-3-% NaOH and 6-7-% Na₂SO₄ at volume ratio equal to 5 and temperature of 18-20 C. Then homogenization is carried out through capron cloth. In the course of homogenization, undissolved scale is removed from capron cloth.

EFFECT: enhanced dissolving of collagen; reduced duration of technological cycles; reduced consumption of reagents; low contamination of waste water.

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