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Hidden Nature of the Conversion Reaction from Rare Earth Chloride to Oxychloride and the Application to Novel Separation
Author(s) -
Yamamoto Hiroki,
Miyata Motoyuki,
Murakami Hajime,
Furusawa Katsuyoshi,
Uda Tetsuya
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702581
Subject(s) - rare earth , dew point , chemistry , chloride , oxygen , earth (classical element) , atmosphere (unit) , humidity , atmospheric oxygen , inorganic chemistry , environmental chemistry , mineralogy , meteorology , organic chemistry , physics , mathematical physics
A mutual separation process that uses rare‐earth oxychloride in a proactive way was developed. In particular, the heat‐treatment conditions under which DyCl 3 is converted into DyOCl (without causing such conversion of NdCl 3 ) in dry oxygen with 6.5 ppm of H 2 O (dew point: 209 K) at a relatively low temperature (around 573 K) were determined. A difference between conversion reactions of the two kinds of rare‐earth chlorides into rare‐earth oxychlorides appeared in the case of an oxygen atmosphere with ultra‐low H 2 O content, although this difference is usually hidden in the presence of atmospheric humidity. Under these conditions, high separability of a NdCl 3 and DyCl 3 mixture was demonstrated.