Sulfuric Acid For Leather Tanning Prcessing
In the manufacture of one-bath chrome-tanned leather, a basic salt of chromium sulphate is the usual tanning agent. In the tanning process this salt is decomposed by the hide substance with the liberation
of free sulphuric acid. As the tanning progresses tIllS acid must be partially neutralized to complete the tannage and fix the chrome salt in the hide. Some physical properties of chrome leather are influenced
to a large extent by the ratio of chromium to acid in the finished product. When chrome leather is exposed to an atmosphere polluted with sulphur dioxide, its sulphuric-acid content increases. Frey and Beebe
showed that exposure to gas fumes may result in serious deteriorationof chrome-tanned leltthers, although the deterioration is not as great as for vegetable-tanned leathers under the same condition.
The purpose of the present investigation was to determine the effect of added sulphuric acid on the deterioration of chrome-tanned leather with age. The tensile strength of the leather was used as the criterion
of deterioration as in similar work 2 on vegetable-tanned leathers.
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