酸法水解秸秆条件的优化

Optimization of Hydrolysis Conditions of Corn Stalk by Acid Method

采用酸法水解秸秆,以水解液中还原糖含量为指标,设计单因素试验考察水解剂、酸浓度、料液比、水解温度和水解时间等因素对水解效果的影响,并在此基础上采用正交试验设计对水解条件进行优化。结果表明,以稀硫酸为水解剂水解效果好于乙酸和水。优化的水解条件为水解时间1.0 h、稀硫酸质量分数5%、料液比1∶15(m秸秆∶V稀硫酸,g/mL)、温度120℃,该条件下水解液中还原糖含量为23.47 g/L。活性炭和Ca(OH)2配合使用可以有效地对水解液进行脱色,脱色率达46%。

Corn stalk was hydrolyzed by acid method.Using the content of reducing sugar in hydrolysates as indicator,the effects of hydrolyzing solvent,concentration of acid,solid to liquid ratio,hydrolyzing temperature and time on hydrolyzing were studied by single factor tests,based on which orthogonal design was conducted to optimize the hydrolysis conditions.The result showed that sulfuric acid was better hydrolyzing solvent that water and acetic acid.The optimum hydrolyzing conditions were,hydrolyzing time,1.0 h;mass fraction of sulfuric acid,5%;solid to liquid ratio,1∶15(m∶V,g/mL);and hydrolyzing temperature,120 ℃.Under these conditions,the content of reducing sugar in hydrolysates could be 23.47 g/L.Activated carbon combining with Ca(OH)2 could decolorize the hydrolysates effectively as the decoloration rate reached up to 46%.