期刊
CHEMICAL ENGINEERING RESEARCH & DESIGN
卷 92, 期 8, 页码 1563-1570出版社
ELSEVIER
DOI: 10.1016/j.cherd.2014.03.010
关键词
Pre-hydrolysis liquor; Dissolving pulp; Adsorption; Evaporation; Plant design; UniSim
资金
- NSERC
The pre-hydrolysis liquor (PHL) of the kraft-based dissolving pulp production process is currently sent to the recovery boiler and incinerated. However, PHL contains about 5-8% lignocelluloses that can be utilized in the production of value-added chemicals. In this study, a process for producing xylitol from hemicelluloses in PHL is developed. This process involves several acidification, neutralization, adsorption (along with reactivation) and evaporation stages. The mass balance indicates that 533 kg/h xylitol (with 99% purity), 187 kg/h lignin, 806 kg/h basic ferric acetate, and 1600 kg/h gypsum can be produced from 41,670 kg/h PHL. The energy balance shows that the evaporators are the largest consumers of energy, while the reactivation kiln, acidification, neutralization, and precipitation processes generate some heat. Overall, 41% conversion of xylose to xylitol is achieved. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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