The Characteristics of the Dehydration Reaction and the Durability for the Thermal Decomposition in Na2B4O7·10H2O/Na2B4O7·5H2O System

Na2B4O7·10H2O/Na2B4O7·5H2O 계의 열분해 탈수반응 및 내구성 고찰

  • Choi, Ho-Sang (Department of Chemical Engineering, Kyungil University) ;
  • Park, Young-Tae (Department of Chemical Engineering, Kyungil University)
  • 최호상 (경일대학교 공과대학 화학공학과) ;
  • 박영태 (경일대학교 공과대학 화학공학과)
  • Received : 1999.06.12
  • Accepted : 1999.08.09
  • Published : 1999.10.10

Abstract

This study was carried out to determine the reaction kinetic constant of the dehydration - thermal decomposition of $Na_2B_4O_7{\cdot}10H_2O/Na_2B_4O_7{\cdot}5H_2O$ and to investigate the durability during the repeated use of a chemical heat-storage material and the reproducibility of reaction system. The order of the dehydration reaction was 1st-order. The reaction rate was directly proportional to a partial pressure difference of water steam. The kinetic constant was 0.27 and the reproducibility of dehydration reaction for a kinetic constant and a reaction order was excellent. The activity variation in the durability test of a chemical heat-storage material was within range of ${\pm}5%$ during the repeatedly use in several times.

Keywords

$Na_2B_4O_7{\cdot}10H_2O$;thermal decomposition;chemical heat-storage material;dehydration reaction

Acknowledgement

Supported by : 경일대학교

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