发明名称 |
Phosphoric acid purification |
摘要 |
Wet process phosphoric acid prepared by treating phosphate rock with sulfuric acid and separating calcium sulfate, is purified to obtain a purified phosphoric acid by (a) an acid extracting section contacting the wet process phosphoric acid and a phosphoric acid solution containing impurities obtained in the scrubbing section with an organic solvent in the presence of the hydrochloric acid required for extracting a substantial amount of the phosphoric acid component; (b) a scrubbing section contacting the extract obtained in the acid extracting section with aqueous phosphoric acid or water while maintaining the chloride ion concentration in the aqueous phase in the range of 20 to 40 g/liter as Cl; (c) an acid stripping section contacting the purified extract obtained in the scrubbing section with water and (d) an adsorbing section contacting the extracted phosphoric acid obtained in the acid stripping section with an anion-exchange resin.
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申请公布号 |
US4154805(A) |
申请公布日期 |
1979.05.15 |
申请号 |
US19770842251 |
申请日期 |
1977.10.14 |
申请人 |
TOYO SODA MANUFACTURING CO LTD |
发明人 |
HIRAGA, YOICHI;KIKUCHI, MITSUO |
分类号 |
C01B25/234;(IPC1-7):C01B25/16 |
主分类号 |
C01B25/234 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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