OPTIMIZATION OF THE LIMING PROCESS OF HIDES/SKINS AND ITS IMPLICATIONS FOR VEGETABLE TANNING

I. Akawu, V.O Ajibola, C.E Gimba, E.D Paul, E.N. Oparah, CC Maju, Y.M. Bammai

Abstract


Liming is the use of calcium hydroxide (slake lime) to treat pelts with the aim of modifying the collagen fibre. Box Behnken design was used to determine the effects of three independent process variables in terms of concentrations, time and floats (water) on a goat skin and the optimal reactions conditions for liming were evaluated. A quadratic polynomial model was used to characterize the liming process. The plots showed that these independent process variables influenced the liming conditions. The best condition for the liming process was found to be: 1.5 %, lime concentration, 20 hr and 300 % water. Tanning the pelt with extracts from Caesalpinia coriaria (DD) gave a leather with shrinkage temperature (Ts) of 72 oC and 81 oC after fatliquoring. Based on this finding, vegetable tanning could eventually replace chrome or chrome-vegetable composites in leather industries. 

Keywords: liming, fatliquoring, Box-behnken design, Caesalpinia coriaria (DD) and Tanning


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Chemical Society of Nigeria