Effect of Reaction Conditions on Crystals in the Reaction Crystallization of Lanthanum Oxalate

란타늄 옥살레이트 반응성 결정화에서 반응조건에 따른 결정입자 연구

  • Kim, Hong-Ju (Department of Chemical Engineering Kyung Hee University) ;
  • Kim, Woon-Soo (Department of Chemical Engineering Kyung Hee University) ;
  • Kim, Woo-Sik (Department of Chemical Engineering Kyung Hee University)
  • 김홍주 (경희대학교 화학공학과) ;
  • 김운수 (경희대학교 화학공학과) ;
  • 김우식 (경희대학교 화학공학과)
  • Received : 1998.05.27
  • Accepted : 1998.09.07
  • Published : 1998.12.10

Abstract

Effects of reaction conditions such as power input and feeding time and feeding mode of reactants on the reaction crystallization of lanthanum oxalate in semi-batch reactor were investigated experimentally. Even though the crystal size distribution of lanthanum oxalate was always monomodal, its mean crystal size was significantly varied with the reaction conditions. As the power input and reactant feeding rate increased, the mean crystal size was reduced and the relative induction time was prolonged. The mean crystal size produced in oxalic acid feeding mode was smaller than that in lanthanum chloride feeding mode, but the trend of the relative induction time with the feeding mode was reverse to that of the mean crystal size. The crystal morphology of lanthanum oxalate, which was produced within the ranges of the reaction conditions in our experiment, was maintained as a needle shape.

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