EXHAUSTED CHROME TANNING SOLUTION REGENERATION METHOD Russian patent published in 2004 - IPC

FIELD: leather industry.

SUBSTANCE: exhausted tanning solutions containing toxic chromium compounds, e.g. solution produced at leather and fur manufacture enterprises, are first settled and filtered to remove suspended and fat substances, after which solution is treated with oxidant on heating until dissolved organic impurities are destroyed. Organics-free exhausted solution is then mixed with fresh tanner and returned into process.

EFFECT: achieved reuse of tanner without losses in quality of product.

2 cl, 3 ex