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《Chemical Research In Chinese Universities》 1983-04
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A STUDY ON THE TERNARY SYSTEM LaCl_3-CH_3CONH_2-H_2O AT 0°C AND 30°C

Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua and Chen Yunsheng(Chemistry Department, Northwestern University, Xi' an)  
The solubilities and the refraction indices of the saturated solutions in the titled ternary system have been investigated isothermally at 0°C and 30°C.At 0°C, both the isotherms of solubilities and refraction indices of the system consist of,three branches corresponding to the solid phases, CH3CONH2, LaCl3·4CH3 CONH2·5H2O and LaCl3·7H2O, respectively. The compositions of the two eutonic points are 52.47% (by wt.) CH3CONH2, 21.77,% LaCl3 and 9.46% CH3CONH2,45.59% LaCl3.There is a short metastable segment of solubility curve of LaCl3·7H2O (dotted line) in the diagram, which may. be considered as an extrapolated part of the stable curve of this compound.At 30rC, two phase diagrams were obtained. One was obtained just by stirring the original complexes at 30°C and the other by preheating the original complexes up to the temperature above the m. p. of CH3CONH2 (81°C) and then stirring at 30°C. The former is a stable system. There are four solid phases,LaCl.3.7H2O, LaCl3·4CH3CQNH225H2O, LaCl3 and CH3CONH2. The eutonic solution of the first two solids contains 47.19% LaCl3 and 14.48% CH3CONH2.The solubility curve of anhydrous LaCl3 is very short and the other two eutonics can only be estimated as 33%, 59% and 31%, 66%, respectively. The second diagram (shown in dotted line) is a metastable system. Instead of the ternary compound, there is LaCl3·3H2O as one of the solid phases. The first two eutonic solutions now contain 47%, 29% and 43%, 46% of LaCl3 and CH3CONH3, by the estimation, respectively.The density of the ternary compound determined by pycnometricalmethod, using the related mother liquor or benzene as measureing media,is about 1.70 ( 12 ± 1°C) . The photomicrograph and the X-ray diffraction patterns as well as the d/n values of the ternary compound are also given.The solid phase LaCl3·6H2O reported by Z. M. Zholalieva et al. in 1976 was not found both at 0°C and at 30°C.
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【References】
Chinese Journal Full-text Database 2 Hits
1 Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua and Chen Yunsheng(Chemistry Department, Northwestern University, Xi'an);A STUDY ON TERNARY SYSTEM LaCl_3-CH_3CONHCONH_2-H_2O AT 30℃[J];Chemical Research In Chinese Universities;1983-05
2 Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua and Chen Yunsheng( Department of Chemistry, Northwestern University, Xian );A STUDY ON TERNARY SYSTEM LaCl_3-CH_3CONHCSNH_2-H_2O AT 30℃ AND 50℃[J];Chemical Research In Chinese Universities;1983-05
【Citations】
Chinese Journal Full-text Database 1 Hits
1 Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua, and Chen Yunsheng(Department of Chemistry, Northwestern University,Xian);A STUDY ON TERNARY SYSTEM LaCl_3-THIOUREA-H_2O AT 30℃ AND AT 50℃[J];Chemical Research In Chinese Universities;1982-04
【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 Shen Xuandong Zhao Bangrong (Department of Applied Chemistry, Beijing University of Chemical Technology, Beijing, 100029);Study on the efficiency of scale inhibition action of poly maleic acid[J];JOURNAL OF BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY;1999-03
2 Wu Jilan;Pan Xianming;Qi Shengchu;Qu Linbo;Ha Hongfei Department of Technical Physics, Beijing University, Beijing;RADIATION CHEMISTRY OF LIQUORS Ⅰ.INVESTIGATING THE FORMATION OF PEROXIDE IN IRRADIATED LIQUORS[J];Journal of Radiation Research and Radiation Processing;1989-01
3 Qi Shengchu;Yuan Shaohua;Wu Jilan Technical Physics Department, Peking University, Beijing;RADIATION CHEMISTRY OF LIQUOR Ⅲ.THE FORMATION OF PEROXIDE ON THE IRRADIATION OF LIQUOR MADE FROM DRIED SWEET POTATO[J];Journal of Radiation Research and Radiation Processing;1991-03
4 Bu Naiyu, Xie Youchang, Bai Chunli, Sun Maofen and Tang Youqi ( Department of Chemistry, Peking University, Beijing);STUDY ON MECHANISM OF HIGHLY EFFECTIVE MAGNESIUM-CONTAINING CATALYST FOR ETHYLENE POLYMERIZATION[J];Chemical Research In Chinese Universities;1982-04
5 Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua and Chen Yunsheng(Chemistry Department, Northwestern University, Xi'an);A STUDY ON TERNARY SYSTEM LaCl_3-CH_3CONHCONH_2-H_2O AT 30℃[J];Chemical Research In Chinese Universities;1983-05
6 Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua and Chen Yunsheng( Department of Chemistry, Northwestern University, Xian );A STUDY ON TERNARY SYSTEM LaCl_3-CH_3CONHCSNH_2-H_2O AT 30℃ AND 50℃[J];Chemical Research In Chinese Universities;1983-05
7 Liu Youcheng, Yang Dilun and Lu Huilin (Department of Chemistry, Lanzhou University,Lanzhou);STUDIES ON NEW TYPE CARBON-CARBON BOND INITIATORS[J];Chemical Research In Chinese Universities;1984-03
8 Zhang Jingwen, Xu Zhiluo, Zhou Xiumei, Liu Ying, Li Yuexian, Liu Fuan, Zhu Shaoxian (Department of Chemistry, Jilin University, Changchun);Relationship Between Solvating Power and Dielectric Constants for the Dehydration of Tertiary Alcohol to Alkenes[J];Chemical Research In Chinese Universities;1989-08
9 Chen Juxiang, Ran Xinquan, Guo Zhizhen, Chen Yunsheng (Department of Chemistry, Northwestern University, Xi' an);A Study on Ternary System of LaCl_3-Am(Am=Gly, Glu, Ser)-H_2O(25℃)[J];Chemical Research In Chinese Universities;1990-06
10 Wei Chun(Departmt of Applied Chemistry, Guilin Institute of Technology);RESEARCH ON DETERMINATION OF ACID VALUE AND FREE ACID VALUE IN TUNG OIL ANHYDRIDE[J];JOURNAL OF GUILIN INSTITUTE OF TECHNOLOGY;1995-01
【Co-references】
Chinese Journal Full-text Database 1 Hits
1 Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua, and Chen Yunsheng(Department of Chemistry, Northwestern University,Xian);A STUDY ON TERNARY SYSTEM LaCl_3-THIOUREA-H_2O AT 30℃ AND AT 50℃[J];Chemical Research In Chinese Universities;1982-04
【Secondary References】
Chinese Journal Full-text Database 1 Hits
1 CHEN Qiang 1,CAO Li yun 2,XI Chen 3 (1.Dept. of Chemical Engineering, Baoji Coll. Arts & Sci., Baoji, Shaanxi 721007, China; 2.Dept. of Chemical Engineering, Northwest University of Light Industry, Xianyang, Shaanxi 712081, China; 3.Dept. of Chemistr;STUDY ON THE TERNARY SYSTEM OF La(NO_3)_3-CH_3CONHCONH_2-H_2O[J];Journal of Northwest Institute of Light Industry;2001-04
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