Salt-free Chromium Tanning: Practical Approaches

IF 0.6 4区 工程技术 Q4 CHEMISTRY, APPLIED Journal of The American Leather Chemists Association Pub Date : 2022-01-03 DOI:10.34314/jalca.v117i1.4690
M. Sathish, R. Aravindhan, J. Rao
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引用次数: 1

Abstract

Chromium tanning finds a prominant place in leather manufacturing for permanent stabilization of hide/skin matrix. Though, it has multiple advantages in terms of high thermal stability, easy process and low cost etc., the current practice is not environmentally sustainable. Poor chromium exhaustion and TDS load generation are the major environmental threats of conventional chromium tanning systems. On the other hand, salt-free chromium tanning is identified as one of the efficient alternative approaches for hide/skin matrix stabilization. However, it has not been commercially practiced due to the several practical difficulties. In this work attempts have been made to develop a practically viable high-performance salt-free chromium tanning system using deliming liquor as tanning float and changing the order of addition of masking salt. The developed methodologies completely avoid the use of salt/basification process and it is suitable for all kinds of raw materials and tannery houses. Besides, the process enjoys 71-77% reduction in TDS load and the uptake of chromium is around 90%. The physical strength characteristics are on par with conventional process and the leathers exhibit good grain tightness and roundness. The developed methodologies are simple and do not require any specialty chemicals.     
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无盐铬鞣制:实用方法
铬鞣制在皮革制造中占有重要地位,用于永久稳定皮革/皮肤基质。虽然它具有热稳定性高、工艺简单、成本低等优点,但目前的做法是不环保的。铬消耗差和TDS负荷产生是传统铬鞣系统的主要环境威胁。另一方面,无盐铬鞣制被认为是皮革/皮肤基质稳定的有效替代方法之一。然而,由于一些实际困难,它尚未商业化。本文尝试以定界液为鞣剂,改变掩蔽盐的添加顺序,开发一种实际可行的高性能无盐铬鞣体系。开发的方法完全避免了盐/碱化过程的使用,适用于各种原材料和制革厂。此外,该工艺的TDS负荷降低了71-77%,铬的吸收率在90%左右。物理强度特性与传统工艺相当,皮革具有良好的颗粒紧密性和圆度。开发的方法简单,不需要任何特殊化学品。
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来源期刊
Journal of The American Leather Chemists Association
Journal of The American Leather Chemists Association 工程技术-材料科学:纺织
CiteScore
1.30
自引率
33.30%
发文量
29
审稿时长
3 months
期刊介绍: The Journal of the American Leather Chemists Association publishes manuscripts on all aspects of leather science, engineering, technology, and economics, and will consider related subjects that address concerns of the industry. Examples: hide/skin quality or utilization, leather production methods/equipment, tanning materials/leather chemicals, new and improved leathers, collagen studies, leather by-products, impacts of changes in leather products industries, process efficiency, sustainability, regulatory, safety, environmental, tannery waste management and industry economics.
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