Chemical/Water-Free Deliming Process Using Supercritical Carbon Dioxide: A Step toward Greener Leather Manufacture,ACS Sustainable Chemistry & Engineering

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Chemical/Water-Free Deliming Process Using Supercritical Carbon Dioxide: A Step toward Greener Leather Manufacture
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-28 , DOI: 10.1021/acssuschemeng.0c03867
Naisini Ariram ₁ , Murali Sathish ₁ , Balaraman Madhan ₁

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Sustainable management plays a vital role in the emerging world, reproducing a pollution-free environment and leading to sustainable growth. In that aspect, leather industries are cornered toward greener leather processes to reduce chemical and water usage. On the same path, deliming is one of the significant steps in the pretanning process to drive into a greener process because the conventional deliming process requires 4% ammonium salts and 100% water, which leads to an enormous amount of ammonium salts in wastewater, leading to eutrophication which adds to the pollution load. To reduce the pollution load, in this work a chemical and water-free deliming process is performed using supercritical carbon dioxide (SCCO₂) as a medium as well as deliming agent to remove the lime content from goat skin at 75 bar pressure within 10 min. Also, the utilized CO₂ is collected and reused for the subsequent set of processes. The morphological analysis shows no grain damage on delimed pelts processed using SCCO₂, and leathers post-tanned from this system exhibit better organoleptic and mechanical strength properties. The developed process opens newer vistas for sustainable development in leather manufacture.

中文翻译：

使用超临界二氧化碳的化学/无水脱胶工艺：迈向绿色皮革制造的一步

可持续管理在新兴世界中扮演着至关重要的角色，它再现了无污染的环境并导致了可持续增长。在这方面，皮革工业被迫转向更环保的皮革工艺以减少化学药品和水的使用。在同一条路线上，脱灰是预鞣制过程中迈向绿色工艺的重要步骤之一，因为常规的脱灰过程需要4％的铵盐和100％的水，这会导致废水中大量的铵盐，富营养化会增加污染负荷。为了减少污染负荷，在这项工作中，使用超临界二氧化碳（SCCO ₂）作为介质和脱灰剂，可在10分钟内在75巴压力下从山羊皮中去除石灰含量。而且，收集利用的CO ₂并将其再用于随后的一组过程。形态分析表明，使用SCCO ₂处理的脱皮兽皮没有颗粒受损，并且从该系统后鞣制的皮革表现出更好的感官和机械强度性能。先进的工艺为皮革制造的可持续发展开辟了新的前景。

更新日期：2020-08-10

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