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首页> 外文期刊>Separation and Purification Technology >Recovery of chromium(III) from wastes of uncolored chromium leathers. Part II. Solvent extraction of chromium(III) from alkaline protein hydrolyzate
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Recovery of chromium(III) from wastes of uncolored chromium leathers. Part II. Solvent extraction of chromium(III) from alkaline protein hydrolyzate

机译：从无色铬皮废料中回收铬（III）。第二部分从碱性蛋白质水解物中溶剂萃取铬（III）

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摘要

Experimental studies were made on the solvent extraction of chromium(III) with Aliquat 336 from the protein hydrolyzate obtained by the alkaline hydrolysis of wastes of uncolored chromium-tanned leathers. The effects of NaOH concentration in the protein hydrolyzate, contact time of the organic and aqueous phases, the aqueous/organic phase volume ratio, and temperature on the extraction of chromium(III) and collagen proteins/peptides were examined. Stripping of chromium(III) from the loaded organic phase is also presented. Chromium(III) can be efficiently removed (99%) from the alkaline hydrolyzate by the solvent extraction with Aliquat 336 after 60-90 min at temperature 50 °C and at the aqueous/organic phase volume ratio equal to 5/1. Moreover, it was found that during one cycle of the alkaline hydrolysis followed by the extraction and stripping operations, chromium(III) can be separated from the source leather wastes with the total yield over 90%. The final products are: the protein hydrolyzates contaminated with traces of Cr(III) (less than 5 ppm) and the solutions of chromium(III) sulfate containing small quantities of protein substances.
机译：实验研究了用Aliquat 336从无色铬鞣革废料的碱水解中获得的蛋白质水解物中萃取铬（III）的方法。研究了蛋白质水解物中NaOH浓度，有机相和水相的接触时间，水/有机相体积比和温度对铬（III）和胶原蛋白/肽的提取的影响。还提出了从负载的有机相中去除铬（III）的方法。在温度为50°C且水/有机相体积比为5/1的条件下放置60-90分钟后，通过用Aliquat 336进行溶剂萃取，可以有效地从碱性水解物中去除铬（III）（99％）。而且，发现在碱水解的一个循环中，接着是萃取和汽提操作，可以从原料皮革废料中分离铬（Ⅲ），总产率超过90％。最终产品为：被痕量的Cr（III）（小于5 ppm）污染的蛋白水解物，以及含有少量蛋白物质的硫酸铬（III）溶液。

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