Journal of South China University of Technology(Natural Science Edition) ›› 2004, Vol. 32 ›› Issue (2): 10-13,36.

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Effects of pH Valueon Resin Deposition with thePresence of Calcium Ion

Wang Xu1 Zhan Huai-yu1 Chen Gang1 Luo Ju-sheng2   

  1. 1．State Key Laboratory of Pulp and Paper Engineering‚South China Univ．of Tech．‚Guangzhou510640‚Guangdong‚China；
    2．Fujian Pulp and Paper Research Institute‚Fuzhou350005‚Fujian‚China）
  • Received:2003-06-27 Online:2004-02-20 Published:2015-09-07
  • Contact: Wang Xu （born in 1974）‚male‚Ph．D．‚mainly researches on pulping chemistry and wet end chemical control． E-mail:ppeskl＠scut.edu.cn
  • About author:Wang Xu （born in 1974）‚male‚Ph．D．‚mainly researches on pulping chemistry and wet end chemical control．
  • Supported by:
    Supported by Guangdong Provincial Natural Science Foundation （Research Term Project‚ 20003011） and Fujian Provincial Natural Science Foundation （014460）

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Abstract: The effects of pH value on resin deposition with the presence of Ca 2＋ were studied by using the device of “Rotating-mixer” and the method of GC-MS analysis．It is found that the decrease of pH value results in resin deposition and pH7∙0is the turning point．The deposits were analyzed by GC-MS after being separated into combined resins and free resins．Experimental results show that calcium soaps and free resins contribute together to deposits formation．The combined resins would change into free resins at low pH and high temperature．Acidic components play an important role in soaps formation and the soaps of fatty acids are more stable at low pH value．

Key words: pH value, resin deposition, calcium soap

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