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生物质化学工程

生物质化学工程 ›› 2007, Vol. 41 ›› Issue (4): 1-5.

• 研究报告 •    下一篇

膜分离技术制备高纯单宁酸的研究

张太龙, 张宗和   

  1. 中国林业科学研究院 林产化学工业研究所;国家林业局 林产化学工程重点开放性实验室, 江苏 南京 210042
  • 收稿日期:2007-05-18 修回日期:1900-01-01 出版日期:2007-07-30 发布日期:2007-07-30
  • 通讯作者: 张宗和(1940- ),男,黑龙江绥化人,研究员,博士生导师,主要从事单宁化学的研究和开发。

Study on Preparation of High-purity Tannic Acid by Membrane Separation

ZHANG Tai-long, ZHANG Zong-he   

  1. Instiute of Chemical Industry of Forest Products, CAF;Key and Open Lab.on Forest Chemical Engineering, SFA, Nanjing 210042, China
  • Received:2007-05-18 Revised:1900-01-01 Online:2007-07-30 Published:2007-07-30

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摘要： 工业单宁酸经改性活性炭预处理后,用超滤和纳滤技术纯化的方法制备高纯度单宁酸。重点考察了料液质量分数、操作压力差、料液温度对膜分离效果的影响。确定的最佳工艺条件是:料液质量分数 15%、截留相对分子质量为 6000 的超滤膜和截留相对分子质量为600的纳滤膜的操作压力差分别为 0.10 MPa 和 0.08 MPa、料液温度 40℃。同时探讨了颗粒活性炭通过硝酸氧化改性增强其吸附性能的方法。分析结果表明,膜分离技术有效地实现了不同分子质量的物料分级和截留,精品单宁酸的含量为 97.3%,收率为 84.7%。

关键词: 高纯单宁酸, 膜分离, 改性活性炭

Abstract: High-purity tannic acid was prepared from industrial tannic acid by the methods of membrane separation and modified activated carbon pretreatment. Effects of factors such as solution concentration, operation pressure difference, solution temperature on result of membrane separation were studied. Optimum conditions are as follows: solution concentration 15%(mass fraction),operation pressure difference 0.1 MPa for ultrafiltration membrane (molecular mass cut-off 6000) and 0.08 MPa for nanofiltration membrane (MMCO 600), solution temperature 40℃.In order to enhance activated carbon absorption properties, modification of granular activated carbon with nitric acid was also explored. Experimental results showed that technology of membrane separation promoted the content and yield of tannic acid significantly, which reached 97.3% and 84.7% respectively.

Key words: high-purity tannic acid, membrane separation, modified activated carbon

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