Effect of CaCO3 and/or Polyaluminium Chloride (PAC) Treatment on the Main Components in Prehydrolysis Liquor of Whangee Dissolving Pulp

Ruiping Tong, Chaojun Wu, Chuanshan Zhao, Dongmei Yu

Abstract


Lignin removal is essential for the value-added utilization of hemicelluloses in the prehydrolysis liquor (PHL) of a kraft-based Whangee (a genus of bamboo) dissolving pulp production. In this work, a novel process concept was proposed for a calcium carbonate (CaCO3) treatment of PHL. The results revealed that the optimum dosage of an individual system of CaCO3 and polyaluminium chloride (PAC) treatment was 1.7% and 16.0%, at which the total sugars retention was 95.7% and 94.4%, the acid-soluble lignin removal 6.09% and 9.29%, and the acid-soluble lignin selectivity 58.6% and 62.4%, respectively. Alternatively, CaCO3 and 16.0% PAC were employed in a dual system to remove the lignin. Dual vs. individual system results showed that the highest total sugars retention (97.3%) and acid-soluble lignin selectivity (77.5%) occurred at the optimum dosage (2.0%/16.0%) of a dual CaCO3/PAC system, and the highest mannose (84.2%) and glucose retention (96.5%) with a dual system of 1.0%/16.0% CaCO3/PAC. Additionally, in the dual system, the adding order of 1.0% CaCO3 and then 16.0% PAC showed that 1.0%/16.0% CaCO3/PAC was more effective than 16.0%/1.0% PAC/CaCO3.

Keywords


Prehydrolysis liquor; CaCO3 and/or PAC treatment; Whangee dissolving pulp; Lignin removal; Sugars retention

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