醇-水预处理液中乙醇体积比对毛竹木聚糖溶出和降解规律的影响

Effect of Ethanol Volume Ratio in Alcohol-Water Pretreatment Solution on the Dissolution and Degradation of Xylan in Moso Bamboo

研究了醇-水预处理液中乙醇体积比对毛竹木聚糖溶出和降解规律的影响。结果表明,特定预处理温度和时间条件下,随着预处理液中乙醇体积比的增加,其预处理液初始p H值不断降低,最终固体基质得率则不断升高,木聚糖移除率和糠醛回收率不断降低。当预处理温度和时间分别为185℃和120min时,乙醇体积比为0%、20%、40%、60%、80%和98%的预处理液所产生木聚糖潜在溶出度分别为81.05%、67.30%、54.85%、36.00%、16.21%和6.04%,该潜在木聚糖溶出度与预处理液中乙醇体积比之间存在良好的线性关系。不同乙醇体积比的预处理介质所产生木聚糖移除率与其初始p H存在统一的指数函数关系,证明预处理液初始pH值是影响木聚糖移除率高低的决定性因素。

The effect of ethanol volume ratio in alcohol-water pretreatment solution on the dissolution and degradation of xylan in moso bamboo was studied. Under certain pretreatment temperature and time,the initial p H of the pretreatment solution decreased with the increase in ethanol volume ratio,and the solid substrate yield increased. The xylan removal and furfural recovery were decreased with the increase in ethanol volume ratio. At185℃ for 120 min,the potential dissolution degree of xylan were 81. 05%,67. 30%,54. 85%,36. 00%,16. 21% and 6. 04% when ethanol volume ratio in alcohol-water pretreatment solution were 0%,20%,40%,60%,80% and 98%,respectively. There is a good linear relationship between the potential dissolution degree of xylan and ethanol volume ratio. Besides,the xylan removal from the pretreatment medium with different ethanol volume ratio has a uniform exponential function relationship with their initial p H,proving that the initial p H value of the pretreatment solution is the decisive factor affecting the xylan removal.