Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Xiongchu Avenue 693, Wuhan 430073, China.
Bioresour Technol. 2013 Mar;131:349-56. doi: 10.1016/j.biortech.2012.12.145. Epub 2013 Jan 3.
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 °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.
本研究旨在探讨反渗透法同时分离和浓缩模型木质纤维素水解物中乙酸和糖的可行性和效率。通过使用合成的木糖-葡萄糖-乙酸模型溶液，考察了 pH 值、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 巴以上时，单糖几乎完全被截留，而乙酸的保留率随着 pH 值和压力的增加而增加，随着温度的升高而降低。在 pH 值为 2.93（模型木质纤维素水解物的初始 pH 值）、40°C 和 20 巴的最佳操作条件下，乙酸相对于木糖和葡萄糖的最高分离因子分别高达 211.5 和 228.4。此外，还采用了浓缩和透析过程。因此，通过反渗透法同时实现了高糖浓度和有益的低乙酸浓度。
