Browsing by Subject "Leather industry and trade -- By-products"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Characterization of leather powder using inverse high performance liquid chromatography(Texas Tech University, 2001-12) Huang, HongjunLeather powder represents a waste leather material. which has been the focus of value-added product utilization studies for the past two decades. It is hereby studied with inverse high performance liquid chromatography. The surface chemistry of this material is detailed through chromatographic elution studies of a series of solute probes with mobile phases of different pH. Probe molecules, including acids, bases. and neutral markers, were used to study the amino and carboxyl functional groups. as well as hydrophobic sites on leather powder. Capacity factor. chromatographic efficiency, recovery and statistical moments were determined for selected probe molecules. A unique, flow-through method for leather powder characterization has been developcd.Item Extraction of post-tanning chemicals from leather wastes(Texas Tech University, 2000-12) Arcot, G. SenthilkumarThe disposal of leather scraps produced by the footwear industry is a difficult and expensive task due to their undesirable and adverse effects on the environment. It will be profitable for the shoe industry to convert this waste into value added products. This thesis investigated the feasibility of employing supercritical fluid extraction (SFE) technique in the pre treatment phase of gelatin extraction process (Taylors' Process). The current study had three experimental phases namely sample preparation, extraction of components from the sample and quantification of the extracted components. Three methods (one-step process, two-step process and modifier-assisted SFE process) were used in the extraction of components from leather samples. In the one-step process, the post-tanning chemicals were extracted using SFE. In the two-step process, Soxhlet extraction followed by SFE was employed in extracting the post-tanning chemicals. Preliminary SFE experiments were conducted to determine optimum extracting conditions for the extraction of post-tanning chemicals from leather scraps. The third method was similar to one-step process, except that instead of using carbon dioxide as extracting solvent modified carbon dioxide was used. The modifiers used were methanol and phenol. This research was able to introduce SFE as an option for extracting post-tanning chemicals from leather scraps by optimizing the extraction conditions and comparing the results with conventional Soxhlet extraction technique.