Kinetics of replacement reaction between potassium chloride and sodium pentaborate for preparing potassium pentaborate

Jin Ping Zhang, Yong Sun, Gang Yang, Zuo Hu Li

Research output: Journal PublicationArticlepeer-review

Abstract

The preparation method of potassium pentaborate (KB5O8) was studied with the replacement reaction between potassium chloride and sodium pentaborate solution. The effects of sodium pentaborate concentration, reaction temperature and reactant mole ratio (KCl:NaB5O8) on the crystallization rate of KB5O8 were investigated. The results show that sodium pentaborate concentration is the most influential factor for affecting the reaction, while reaction temperature and reactant mole ratio (KCl:NaB5O8) are secondary factors. The reaction kinetics was studied by selecting control-step method as well as modified Debye-Hückel activity coefficient model and Bromley osmotic coefficient model. The results show that the reaction order is 2 and apparent reaction activation energy 85.8 kJ/mol, and the reaction is mainly controlled by precipitation of KB5O8 · 4H2O.

Original languageEnglish
Pages (from-to)934-938
Number of pages5
JournalGuocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering
Volume7
Issue number5
Publication statusPublished - Oct 2007
Externally publishedYes

Keywords

  • Potassium chloride
  • Potassium pentaborate
  • Reaction kinetics
  • Replacement reaction
  • Sodium pentaborate

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Industrial and Manufacturing Engineering

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