Lignin Recovery from the Black Liquor of Reed Pulping

Abstract:

Lignin is extracted from Reed black liquor of papermaking through the acid-precipitation method in this article. Single factor and orthogonal experimental design are applied to optimize research on the extraction of lignin from black liquor of papermaking process, the optimum extraction conditions are obtained: pH is 2, reaction temperatures is 60°C, coagulation time is 30min, flocculation temperature is 70°C. The results show that: the extraction effect of sulfuric acid is better than hydrochloric acid, and its flocculation effect of pH value on lignin production rate is the most, the following is by flocculation temperatures, flocculation, reaction temperature is with minimal impact. And the infrared spectroscopy is used to characterize the structure of extracting lignin.

• Periodical: Advanced Materials Research (Volumes 512-515)
• Pages: 2376-2380
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.512-515.2376
• Online since: May 2012
• Authors: Ke Ming Xu, Hai Yan Liu, Long Dong, Shuang Tong, Yong Jian Liu
• Keywords: Acid Precipitation, Black Liquor of Papermaking, Lignin

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