Wet process phosphoric acid purification by solvent extraction using N-octanol and tributylphosphate mixtures
Wet process phosphoric acid purification by solvent extraction using N-octanol and tributylphosphate mixtures
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DOI：
10.1002/jctb.4023
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发表时间：
2013-09-01
影响因子：
3.4
通讯作者：
Li, Jun
中科院分区：
文献类型：
--
作者：
Ye, Changwen;Li, Jun
有机萃取剂溶剂萃取是湿法磷酸净化的重要技术。采用正辛醇-磷酸三丁酯混合溶剂对湿法磷酸进行液-液萃取净化研究。研究了萃取净化湿法磷酸的条件，即振荡时间、温度、溶剂组成和P2 O 5浓度。测定了H_3PO_4-H_2O-混合溶剂伪三元体系在313.15K时的相图。McCabe-Thiele图表明，在313.15K下，三个逆流阶段可实现约91wt%的P2 O 5萃取。分别用含10wt%P2O5的纯磷酸和双蒸水进行洗涤和反萃操作。优化提取条件和体系，为实现工业化生产提供理论和技术依据。(c)2012年化学工业协会
BACKGROUNDSolvent extraction using organic extractants is an important technology for purifying wet process phosphoric acid. The purification of the wet process phosphoric acid by liquid-liquid extraction using solvent mixtures of N-octanol and tributylphosphate has been investigated.RESULTSThe purification process comprised extraction, scrubbing and stripping operations. The extraction conditions, i.e. shaking time, temperature, composition of solvent mixtures and P2O5 concentration for purification of the wet process phosphoric acid were studied. The phase diagram of the pseudo-ternary system H3PO4-H2O-solvent mixtures at 313.15K was determined. The McCabe-Thiele diagram showed that three counter-current stages achieved about 91wt% P2O5 extraction at 313.15K. Scrubbing and stripping operations using pure phosphoric acid with 10wt% P2O5 and doubly distilled water, respectively, were studied.CONCLUSIONSThe phosphoric acid finally produced was found to be high grade which met the special requirements of the user. Optimization of the extraction conditions and system was capable of providing academic and technical foundations to realize industrial production. (c) 2012 Society of Chemical Industry