Chrome tanning of leather with reduced waste of chromium
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United States of America Patent
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Jul 3, 1990
Grant Date -
N/A
app pub date -
Jul 6, 1989
filing date -
Jul 6, 1988
priority date (Note) -
Expired
status (Latency Note)
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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.
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