膜科学与技术

多效膜蒸馏法秸秆酸水解液脱毒及糖浓缩

作者：刘青¹，秦英杰¹，²，刘建军¹，张云¹，刘立强²，崔东胜²

单位： 1.天津大学化工学院，天津，300072；2.洁海瑞泉膜技术有限公司，天津，300300

关键词：多效膜蒸馏；秸秆酸水解液；挥发性组分；葡萄糖；脱毒；浓缩

出版年,卷(期):页码： 2015,35(6):87-92

摘要：

秸秆酸水解液含有有毒组分从而影响发酵效率。本文研究了多效膜蒸馏用于模拟秸秆酸水解液中抑制性挥发组分脱除和糖分浓缩，以膜通量J、造水比GOR和葡萄糖截留率Rg为性能指标，考察了冷料液进口温度T1、加热后料液进口温度T3、料液浓度Cf和料液流量Ff的影响。实验结果表明，T1升高时，J下降，而GOR随之升高；T3升高时，J和GOR均随之升高；Cf增加，J和GOR均随之降低；Ff增加，J增加，而GOR随之降低；Rg几乎不受操作条件的影响，始终在99.99%以上。实验过程中最高J可达6.17 L·m-2·h-1，最高GOR可达13.57。对模拟秸秆酸水解液中的甲酸、乙酸、乙酰丙酸、糠醛的脱除率分别达87.76%、90.62%、4.25%、76.52%以上，同时可将水解液中的葡萄糖浓缩14倍以上。该研究结果表明，多效膜蒸馏过程可有效脱除水解液中挥发性组分，同时对糖分进行浓缩。

The aqueous glucose solution obtained from hydrolyzing straws containsformic acid, acetic acid, levulinic acid and furfural which reduce the fermentation efficiency. In this study, multiple-effect membrane distillation (MEMD) process was used to remove these volatile organic species from the simulated hydrolysate and meanwhile enrich the sugar solution. The effects of cold feed-in temperature T1, heated feed-in temperature T3, feed-in concentration Cfand feed-in flow rate Ffwere tested on the performance of MEMD process indicated by permeation flux J, gained-output-ratio (GOR) and rejection rate of glucose Rg. The experimental results showed that J decreased with the increase of T1 while GOR increased; J and GOR both increased with the increase of T3; J and GOR both decreased with the increase of Cf; J increased with the increase of Ff while GOR decreased; Rg was hardly affected by these factors and kept above 99.99% during the whole process. The maximum J and GOR obtained were 6.17 L·m-2·h-1 and 13.57, respectively. The removal rates of formic acid, acetic acid, levulinic acid and furfural were87.76%, 90.62%, 4.25% and 76.52%, respectively, and meanwhile the glucose in the hydrolysate could be concentrated 14 times. This study showed that MEMD process could remove volatile organic species from the hydrolysateand meanwhile enrich the sugar solution effectively.

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