Simultaneous acetic acid separation and monosaccharide concentration by reverse osmosis
Simultaneous acetic acid separation and monosaccharide concentration by reverse osmosis
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通过反渗透同时分离乙酸和浓缩单糖
DOI：
10.1016/j.biortech.2012.12.145
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发表时间：
2013-03-01
影响因子：
11.4
通讯作者：
Wei, Jiang
中科院分区：
文献类型：
--
作者：
Zhou, Fanglei;Wang, Cunwen;Wei, Jiang
研究了反渗透法同时分离木质纤维素水解液中乙酸和糖的可行性和有效性。以木糖-葡萄糖-乙酸为模型溶液，考察了pH、温度、压力和进料浓度等操作参数对溶质保留率的影响。结果表明，在20 bar以上的压力下，单糖几乎被完全截留，乙酸截留率随pH值和压力的升高而升高，随温度的升高而降低。在pH 2.93（木质纤维素水解液的初始pH）、40 ℃和20 bar条件下，乙酸对木糖和葡萄糖的最大分离因子分别达到211.5和228.4。在此基础上，对浓缩和渗滤工艺进行了优化。因此，通过反渗透同时实现了高糖浓度和有利地较低的乙酸浓度。(C)2012爱思唯尔有限公司保留所有权利。
This study aimed to investigate the feasibility and efficiency of simultaneous acetic acid separation and sugar concentration in model lignocellulosic hydrolyzates by reverse osmosis. The effects of operation parameters such as pH, temperature, pressure and feed concentration on the solute retentions were examined with a synthetic xylose-glucose-acetic acid model solution. Results showed that the monosaccharides were almost completely rejected at above 20 bar, while the acetic acid retention increased with the increase in pH and pressure, and decreased with the temperature increase. The maximum separation factors of acetic acid over xylose and glucose reached as high as 211.5 and 228.4 at pH 2.93 (the initial pH of model lignocellulosic hydrolyzates), 40 degrees C and 20 bar. Furthermore, the concentration and diafiltration process were employed at optimal operation conditions. Consequently, a high sugar concentration and a beneficially lower acetic acid concentration were simultaneously achieved by reverse osmosis. (C) 2012 Elsevier Ltd. All rights reserved.