University of Khartoum

In Partial Fulfillment Of The Requirments For The Dgeree Of M. Sc. (Leather Production) Department Of Meat Production Faculty Of Animal Production April 2003

In Partial Fulfillment Of The Requirments For The Dgeree Of M. Sc. (Leather Production) Department Of Meat Production Faculty Of Animal Production April 2003

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Title: In Partial Fulfillment Of The Requirments For The Dgeree Of M. Sc. (Leather Production) Department Of Meat Production Faculty Of Animal Production April 2003
Author: ABU ELFATAH, KAMAL ELDIN
Abstract: This work has been undertaken to utilize the used sulphide-lime unhairing liquor in order to reduce these caustic chemicals in the effluent, save the fresh water and minimize the cost of the liming processes. The chemical analyses of the used liquor indicated that a considerable amount of sulphide of 2100 mg/l was present. And as the lime has a limited solublitiy of 0.125%, undissolved lime always remains in solution; this undissolved lime will dissolve when its equilibrium solubility is disturbed by recycling. It has been observed that the unhairing power of the old lime liquor was more effective than the fresh liquor; this is due to the fact that the disulphide link of the hair is broken and dissolved during the liming process and consequently the sulphide content will build-up through recycling. Wet salted sheepskins were processed with the normal recipe and the once-used lime solution was analyzed for lime and sulphide content, its composition was leveled by a make-up fresh lime-sulphide liquor and recycled. The same was repeated for seven cycles, each time the recycling flow rate was leveled with a fresh make-up. The average savings were 65% sodium sulphide, 33% lime and 90 % water. The limed-unhaired pelts from each cycle were further processed through tannage, retannage, drying, and finishing. The physical and chemical properties were satisfactory. The leather produced is normal, soft, of good tensile strength, full and of good quality. This process is recommended to be applyed in all tanneries. Its application is simple. It requires a collection pit, a filter, a pump and a pipe line to and from the drums.
Description: 83page
URI: http://hdl.handle.net/123456789/7914
Date: 2015-04-01


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