Chrome tanning of leather with reduced waste of chromium

Details Chrome tanning of leather with reduced waste of chromium Chrome tanning of leather with reduced waste of chromium

1989-07-06

1990-07-03

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9419R, C14C 306

Patent

active

049387790

ABSTRACT:
The efficiency of chromium utilization in chrome tanning of hides to make leather is greatly improved by performing the preliminary neutralization of the acid tanning liquor in the presence of an aldehydo or keto acid, before conventional subsequent neutralization with an alkali aluminum silicate. Most preferably, a combination of glyoxylic acid and magnesium oxide is used for the preliminary neutralization.

REFERENCES:
patent: 4272242 (1981-06-01), Plapper et al.
patent: 4715861 (1987-12-01), Lotz et al.
Das Leder, 26, 21-31 (1975); Das Leder, 34, 89-93 (1983).

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