Abstract

Floats containing chemical constituents which are to a varying extent harmful to the environment are produced from every stage of the aqueous phase in leather and hide processing. There are purification processes which reduce the noxious effect but these create a quantity of sludge which is, nowadays increasingly difficult to use or dispose of. Consequently, it seems useful to seek solutions in which floats are free from chromium, fats and dyestuffs, to allow recycling during manufacture. In a previous paper, we described a new leather chrome-tanning process, the CrAB, tanning process, using seif-basifying and masking agents, which gives the high exhaustion of chrome-tanning liquors. In this work, research has been done to study dyeing in the CrAB. process. We took into account dye exhaustion; chromium released; factors that influence dyeing behavior and the quality of the dyed leathers.