桑枝皮纤维脱胶废液中的可利用组分分离与回收  

Isolation and Recovery of Utilizable Components in Degumming Waste Liquid of Mulberry Bark Fibers

作　　者：储诚灿[1] 刘琳[1] 姚菊明[1] 

机构地区：[1]浙江理工大学材料与纺织学院,先进纺织材料与制备技术教育部重点实验室,杭州310018

出　　处：《蚕业科学》2011年第6期1067-1072,共6页ACTA SERICOLOGICA SINICA

基　　金：新世纪优秀人才支持计划项目(No.NCET070763)

摘　　要：桑枝皮纤维制备过程中会产生大量含半纤维素、果胶和木质素等有机成分的废水。以桑枝皮纤维脱胶废液为原料,研究从脱胶废液中高效分离回收半纤维素、果胶和木质素等可利用组分的工艺,并对回收样品的化学结构进行表征。结果表明,调节废液pH值为4.5、脱胶废液与95%乙醇的体积比为1∶2时,可使半纤维素和果胶组分沉淀析出,进一步加入50 g/LCaCl2溶液沉析使二者有效分离,2种组分的得率分别为15.90%和29.41%,同时脱胶废液分离上清中的木质素也得到最大程度回收,其得率为18.75%。傅里叶变换红外光谱(FTIR)分析表明,回收得到的半纤维素和木质素样品的主要成分分别为4-甲氧基葡萄糖醛酸聚木糖、愈创木基或紫丁香基木质素,而果胶样品为高纯度低酯果胶。3种组分分离回收后脱胶废液中总有机碳(TOC)、化学需氧量(COD)、悬浮物(SS)的去除率分别达到93.5%、93.5%和100%。研究结果显示,采用该回收工艺能使桑枝皮纤维脱胶废液中的各种可利用组分得到有效分离,可实现桑枝皮纤维的清洁化生产和资源高效利用。A large amount of wastewater containing organic components,including hemicellulose,pectin and lignin,is produced during the preparation of fibers from mulberry barks.In present study,the degumming waste liquid of mulberry bark fibers was used as the raw material to investigate the technology for efficiently isolating and recovering hemicellulose,pectin,lignin and other utilizable components and to characterize chemical structures of the recovered samples.The results showed that pH 4.5 of the waste liquid and volume ratio 1 ∶2 of degumming waste liquid to 95% ethanol could lead to the precipitation of hemicellulose and pectin.And further addition of 50 g/L CaCl2 led to effective separation of the two components,with recovery yield of 15.90% and 29.41% respectively.Meanwhile,lignin in the supernatant of degumming waste liquid was also recovered to the highest extent,with a recovery yield of 18.75%.Fourier transform infrared spectroscopy（FTIR） analyses revealed that the main components of recovered hemicellulose and lignin samples were 4-methoxy-glucuronic acid xylans,guajacyl lignin or syringyl lignin,while the obtained pectin sample was highly purified low-methoxy pectin.Moreover,the removal efficiency of total organic carbon（TOC）,chemical oxygen demand（COD） and suspended substance（SS） in the degumming waste liquid was 93.5%,93.5% and 100%,respectively.These results indicate that using this recovery technology can effectively separate various utilizable components in degumming waste liquid of mulberry bark fibers,making it realizable to have clean production of mulberry bark fibers and efficient use of resources.

关 键 词：桑枝皮纤维脱胶废液 半纤维素 果胶 木质素 回收工艺 

分 类 号：S888[农业科学—特种经济动物饲养]