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›› 2001, Vol. 1 ›› Issue (1): 0-0.

• 1 •    

超细二氧化钛粉末在水溶液中的分散

崔爱莉, 王亭杰, 何红, 金涌   

  1. (清华大学化学工程系， 北京 100084
  • 出版日期:2001-02-20 发布日期:2001-02-20

Comparison of Several Extraction Techniques for Recovery of Glycyrrhizic Acid from G. uralensis Fisch

PAN Xue-jun, LIU Hui-zhou, JIA Guang-he, CHEN Jia-yong   

  1. Youth. Lab. Sep. Sci. and Eng., Inst. Chem. Metall., Chinese Academy of Sciences, Beijing100080, China
  • Online:2001-02-20 Published:2001-02-20

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摘要： 实验研究了不同分散剂对超细二氧化钛粉末在水溶液中分散的影响，采用分散相的沉降高度和分散后颗粒的粒度分布评价分散效果，得出六偏磷酸钠、硅酸钠、乙醇是超细二氧化钛粉末的良好分散剂. 通过测定分散相在分散介质中的z电位，分析了分散剂的分散机制，六偏磷酸钠和硅酸钠可显著提高水溶液中二氧化钛颗粒表面z电位的绝对值，乙醇在二氧化钛颗粒表面形成良好的溶剂化层，使超细二氧化钛颗粒在水溶液中获得良好稳定的分散.

关键词: 超细粉, 分散, 二氧化钛, 团聚, 双电层作用

Abstract: Comparison of extraction methods for isolation of glycyrrhizic acid from G. uralensis Fisch is presented. The experiments show that microwave-assisted extraction (MAE) was more effective than the conventional techniques such as heat reflux extraction, Soxhlet extraction and extraction at room temperature. Due to the short extraction time and low consumption of solvent and energy, MAE technique is suitable for fast extraction of a variety of licorice-containing products.

Key words: G. uralensis Fisch, glycyrrhizic acid, solvent extraction, microwave

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