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Improvement of alkali efficiency for purification of dissolving pulp by a modified cold caustic extraction process
Liang He1, Qing-Qing Guan2, Lin-Cai Peng3
1Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, 510640, China.
Abstract:
In this study, a reutilization of caustic lye during cold caustic extraction (i.e., CCE) process to produce high-purity dissolving pulp and high-concentrated hemicellulose solution was proposed. The results showed that the lye can be reused about 12 times for producing high-purity dissolving pulps. With the number of CCE stages of 12, the hemicellulose in the lye can be auto-concentrated to about 37g/L. The alkali efficiency of the modified CCE process was about 6 (or 3) times better than the traditional CCE process with low- (or middle-) consistency of pulps. Therefore, the present process is feasible to be used for the purification of dissolving pulps with a cost-effective manner.
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