浓硫酸水解废弃木糖渣的工艺研究
2012-09-11付俊华邵志涛李月番
付俊华,邵志涛,李月番
(1.濮阳市中原石化工程有限公司,河南濮阳457000;2.郑州拓洋实业有限公司,河南郑州450007)
浓硫酸水解废弃木糖渣的工艺研究
付俊华1,邵志涛1,李月番2
(1.濮阳市中原石化工程有限公司,河南濮阳457000;2.郑州拓洋实业有限公司,河南郑州450007)
采用单因素试验法探讨浓H2SO4水解木糖渣制还原糖的影响因素。木糖渣在浓H2SO4作用于水浴温度下进行水解,其较佳的工艺条件为:酸固比(质量比)5∶1,浸泡时间2.5 h,浸泡温度35℃,水解酸浓度45%,水解时间60 min,水解温度90℃,还原糖产率为90.1%。得到还原糖产率高于稀酸水解还原糖产率,且条件温和。为木糖渣的再利用提供了一条环保的生产途径。
木糖渣;浓酸;水解;还原糖
Abstract:The research aimed to discuss the effect factors of the reducing sugar production with concentrated sulfuric acid hydrolysis of xylose residue by the monothetic experimental design method.Xylose residue is hydrolysis with concentrated acid unding the condition of water heating.So the result shows that the optimum hydrolysis conditions for xylose residue with concentrated sulfuric acid are as follows:the weight ratio of pure acid to dry wood is 5∶1,the soak time is 2.5 h,the soak temperature is 35℃,the mass fraction of sulfuric acid is 45%,the hydrolyzing temperature is 90℃,the hydrolyzing time is 60 min.The yield of reducing sugae is found to be 90.1%.The reducing sugar yield is obviously higher than those by diluted sulfuric acid,and the reaction conditions is facile.So it is significative to provide important and environmentally friendly systhetizing method for reusing of the xylose residue.
Key words:xylose residue;concentrated acid;hydrolysis;reducing sugar
木糖渣是木糖生产中产生的废渣,木糖的生产过程中伴有大量的木糖废渣产生,它是一种优质的木质纤维素资源。木质纤维素是地球上最具潜力的可再生能源之一。如何合理的利用开发这种资源,在国际上受到了极大的关注。世界上多个国家投入了大量的资金进行研究。近年来,围绕生物质利用的研究多集中于玉米秸秆、水稻秸秆和松木屑等材料,而对制糖残渣木质纤维素材料研究较少。木糖渣在制木糖过程中已经经过酸水解预处理,因此它更易利用。一般情况下,生产1 t结晶木糖排放含水70%~80%的废渣13~26 t,按我国企业的年生产能力1万t计算,每年有13~26万t木糖废渣排放。废渣的露天堆放不仅占用了大量的耕地,而且对周边环境造成了严重污染。大风吹起废渣,造成大气污染;雨水冲刷废渣流入农田,造成土壤的污染;渗入地下,造成水体污染。……
