Studies on Phase Equilibrium of LaCl3·3H2O-18C6-C2H5OH System at 25℃ and Synthesis and Characterization of Solid Coordination Compounds

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (8): 1172.

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Studies on Phase Equilibrium of LaCl₃·3H₂O-18C6-C₂H₅OH System at 25℃ and Synthesis and Characterization of Solid Coordination Compounds

LI Qian-Ding¹, XUE Hong-Fu², REN De-Hou²

1. Department of Chemical Engineering, Xi'an Petroleum Institute, Xi'an, 710061;
2. Department of Chemistry, Northwest University, Xi'an, 710069

Received:1994-11-09 Revised:1995-04-10 Online:1995-08-24 Published:1995-08-24

Abstract

Abstract: The solubilities of LaCl₃·3H₂O-18C6-C₂H₅OH ternary system at 25℃ were investigated by a semimicro method of phase equilibrium study,and the refractive indexes of saturated solutions were determined.The results indicate that there are three kinds of complexes formed in this system,namely,3LaCl₃·18C6·9H₂O·C₂H₅OH,2LaCl₃·18C6·6H₂O·C₂H₅OH and LaCl₃·18C6·3H₂O. The behavior of water in this system during the equilibrium was examined and the results show that the mole ratio,H₂O/LaCl₃,is always 3:1,no matter it is in liquid or solid phase.Three solid complexes were prepared and characterized by IRspectra,DTG,TG and DSC. According to the DSC,the enthalpies of some steps during the decomposition were obtained for these three complexes.

Key words: Trihydrated lanthanum chloride, Crown ether 18C6, Complex, Solubility, Phase equilibrium

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LI Qian-Ding, XUE Hong-Fu, REN De-Hou. Studies on Phase Equilibrium of LaCl₃·3H₂O-18C6-C₂H₅OH System at 25℃ and Synthesis and Characterization of Solid Coordination Compounds[J]. Chem. J. Chinese Universities, 1995, 16(8): 1172.

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Studies on Phase Equilibrium of LaCl₃·3H₂O-18C6-C₂H₅OH System at 25℃ and Synthesis and Characterization of Solid Coordination Compounds

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