植物纤维素水解液脱除酚类化合物的研究

对植物纤维素水解液中抑制木糖醇发酵的酚类进行了脱除研究。研究表明，水解液采用Ca(OH)₂过中和可以脱除水解液中的一部分酚类化合物;对Ca(OH)₂过中和后的水解液分别采用有机溶剂萃取、活性炭和大孔吸附树脂吸附的方法进行深度脱除酚类化合物研究，结果表明S8大孔吸附树脂脱除植物纤维中酚类化合物的性能优于有机溶剂萃取法及活性炭吸附法。优化S8大孔吸附树脂脱除酚类化合物的操作条件，确定理想的脱毒操作条件为：温度35?℃，溶液pH值6.0，时间8?h，液固质量比5∶1。在该条件下植物纤维水解液通过Ca(OH)₂过中和及S8大孔吸附树脂脱毒，水解液中的多酚化合物的脱除率＞90%，单酚化合物的脱除率＞94%。

Study of the removal of phenolic compounds from lignocellulosic hydrolysate

The removal of phenolic compounds inhibiting the fermentation of hydrolysate in the production of xylitol has been studied. The results show that some phenolic compounds in the hydrolysate can be removed by overliming with calcium hydroxide. The hydrolysate obtained by overliming with calcium hydroxide is subsequantly treated with organic solvents, activated charcoal and macroporous adsorption resins.The results show that the detoxification effect of an S8 macroporous adsorption resin is better than that of organic solvents, activated charcoal or other macroporous adsorption resins. The optimized detoxification conditions for the S8 macroporous adsorption resin are temperature of 35℃, pH 6.0, reaction time 8h, and liquid to solid ratio(mass ratio) 5∶1. The extent of removal of polyphenolic and monphenolic compounds in the hydrolysate obtaines by overliming with calcium hydroxide followed by treatment with S8 macroporous adsorption resin is above 90% and 94% respectively.