FIELD: leather industry.
SUBSTANCE: according to first embodiment of invention, method envisages acid hydrolysis by means of organic acids at temperature higher than room temperature and up to 100°C, extraction of crude gelatin after hydrolysis by way of filtration, and separation of low-grade gelatin and salts through desalting operation. Second embodiment is the same as above except that separation of gelatin and chromium salts is effected using dialysis. Further, ion exchangers are subjected to exhaustive regeneration to ensure complete recovery of chromium and isolation of chromium salts via diafiltration after dialysis with additional isolation and reuse of hydrolysis reagent.
EFFECT: increased yield of gelatin simultaneously with recovery of chromium salts under friendly environmental conditions.
34 cl, 4 dwg, 10 ex
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