Properties of Environment Friendly Nitrogen-Free Materials for Leather Deliming

Abstract:

The deliming experiment of limed pelt for leather-making was carried out by means of formic acid, sulfosalicylic acid, citrate acid, Nylon acid, gluconic acid and other nitrogen-free materials. The impacts of the pH of deliming liquid and the content of calcium ion in the deliming liquid on the deliming effect were investigated. In order to further improve the deliming effect of the material, the nitrogen-free organic acids above were subjected to composite research, wherein the results thereof showed that the deliming values of sulfosalicylic acid, formic acid and citrate acid were relatively high, the deliming abilities were relatively strong, but the buffer during the deliming process was not obvious; the deliming values of Nylon acid and gluconic acid were not relatively high, but the deliming process had a certain buffer; and the deliming effect of composite formic acid and gluconic acid was very good. Compared with the conventional deliming agent (NH₄)₂SO₄, the composite deliming agent not only could remove the pollution caused by ammonia nitrogen in the deliming wastewater and greatly reduce the S^2- in the wastewater, but also could effectively reduce COD_Cr and BOD₅ of the deliming effluent.

• Periodical: Advanced Materials Research (Volumes 532-533)
• Pages: 126-130
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.532-533.126
• Online since: June 2012
• Authors: Zhi Hui Sui, Lei Zhang, Jia Song
• Keywords: Deliming Properties, Leather-Making, Nitrogen-Free Deliming, Organic Acid

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