Cleaner Chromium Tanning Method - Closed Pickle Tan Loop System
An Indian institute is offering technology of cleaner chromium tanning method, closed pickle tan loop system. The technology involves continuous recycling of spent liquors from a suitably standardized less-chrome, high exhaustion chrome tanning in pickling such that there is no discharge of exhaust liquors containing chrome tanning processes, preventing pollution due to these substances on the one hand and avoiding material loss on the other. Compared to conventional chrome tanning process, this new pickle-tan closed loop system ensures near zero discharge of potential pollutants such as chrome and neutral salts viz. sodium chloride and sodium sulfate. Since sulfate bearing streams viz. pickling and chrome tanning spent liquors are continuously recycled and not being allowed to mix with other sectional waste liquors, the anaerobic treatment of end of pipe treatment is improved. Sludge produced would be almost free chrome and hence, disposal becomes easier. CONTACT DETAILS: Dr. A. Subbarama Naidu - Deputy Director & Head (Business Development Cell), Dr. M. Mariappan - Scientist G & Head (Department of Environmental Technology) Central Leather Research Institute Adyar, Chennai 600 020, India. Tel: (91-44) 491 6351, 491 1386 or (91-44) 491 1589, 491 2150 or (91-44) 441 6889, 491 1386, 491 0946 E-mail: [email protected]
Sector: Leather
Country: India
Area of Application: Chemical industry, Tanning industry, Leather industry
Keywords: chromium, recycling, leather, chemical, industry
Advantages: Cleaner production: near zero discharge of chrome and neutral salts in pickle and chrome tanning processes thus preventing pollution due to these substances; Avoids material loss; Water consumption in pickle-tan stage is considerably minimized, ultimately leading to sludge containing less chrome and hence disposal becomes easy; Improved wet blue quality; Considerable saving in post-tanning chemicals.
Environmental aspects: Cleaner Production
Development Status: Fully Commercialized
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Technical specifications:  
Transfer Terms: Joint Venture , Technology Licensing , Equipment Supply , Turnkey
Target Countries: World Wide
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Contact Person: APCTT (UNESCAP)
Address: Asian and Pacific Centre for Transfer of Technology (APCTT) C-2, Qutab Institutional Area
City: New Delhi
Country: India
Zip/Pin Code: 110016

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