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Research on the concentration of hemicellulosic hydrolysate by vacuum membrane distillation
Author(s): 
Pages: 57-61,69
Year: Issue:  4
Journal: Rural Energy

Keyword:  真空膜蒸馏 半纤维素水解液 浓缩;
Abstract: 采用真空膜蒸馏技术浓缩半纤维素水解液,考察了料液的流速、温度、浓度等对膜通量和挥发性发酵抑制物的影响,并进行浓缩试验。结果表明,膜蒸馏对木糖的截留率在99.99%。随着进料流速、进料温度、抑制物浓度和真空度的增加,膜通量增大;糠醛的分离因子随料液温度、真空度、抑制物浓度增加而减少,随流速的增加呈先增大后减小的趋势,而这些操作参数对甲酸、乙酸的分离因子影响不大。在进料温度65℃,料液流速1.5 L/min,真空度0.095 MPa的条件下进行连续浓缩试验,初始膜通量为11.9 kg/(m2.h),随着浓缩的进行,8 h后,膜通量仍维持在9.5 kg/(m2.h),糠醛浓度从0.46 g/L降低到0.23 g/L。
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