Título:
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Isolation of protein products from Chromium-containing leather waste using two consecutive enzymes and purification of final chromium product: Pilot Plant Sudies (1999)
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Autores:
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CABEZA, L. F., Autor ;
MARMER, E. M., Autor ;
BROWN, E. M., Autor ;
TAYLOR, M. M., Autor
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Tipo de documento:
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Article : texto impreso
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Dentro :
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JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS AND CHEMISTS (VOL 83 NRO 1, ene.-feb. 1999)
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Langues:
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Inglés
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Resumen:
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In this paper, the pilot plant trials of a process to treat chrome shavings to isolate protein products and purified chromium are presentes. The process uses two enzymes, pepsin and alkaline protease,in two consecutive extractions with the isolation of a high quality gelatin and a hydrolysate. Chrome shavings(10 kg) are pretreated with 0.1% pepsin at pH 3-3.5 and at room temperature for 8 hours and gelatin is then extracted at pH 8 and 70°C; hydrolysed protein is then isolated with 0.005% alkaline protease at pH 8 and 70°C for 3 hours. The remaining solid, called chrome cake, is chemically treated to prepare it for recycling in the tanning industry. The chemical and physical properties of the protein poducts and the chemical characteristics of the purified chromium are presented.
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