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首页> 外文期刊>Separation and Purification Technology >Purification of wet process phosphoric acid by solvent extraction with TBP and MIBK mixtures
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Purification of wet process phosphoric acid by solvent extraction with TBP and MIBK mixtures

机译：通过使用TBP和MIBK混合物进行溶剂萃取来纯化湿法磷酸

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摘要

In the present work,the purification of the wet process phosphoric acid(WPA)with mixtures of methyl isobutyl ketone(MIBK)and tri-butyl phosphate(TBP)was investigated.Based on a three step purification process,the optimal solvent mixture composition that yielded the highest purified acid with the greatest possible P_2O_5 recovery was obtained for an MIBK percentage of 55%,Acid recovery increased for higher solvent MIBK contents whereas the impurities' contents were lower for near equal TBP and MIBK percentages in the binary solvent mixture.The phase diagram of the ternary system H3PO4-water-optimal solvent mixture was determined.The partition ratios for H3PO4 as well as three trace metallic impurities were also obtained.Relative purification was better for Mg.The lowest selectivity was that of Fe which,unlike for the other trace elements does not improve when the solvent rate increases.The best purifications are obtained for the higher solvent mixture rates.While TBP has the highest selectivity,compared with MIBK,the solvent mixture is more selective for extracting H3PO4.
机译：在本工作中，研究了用甲基异丁基酮（MIBK）和磷酸三丁酯（TBP）的混合物纯化湿法磷酸（WPA）。基于三步纯化工艺，最佳的溶剂混合物组成为在MIBK百分比为55％的情况下，得到的纯酸最高，回收率最高，P_2O_5最高;在二元溶剂混合物中，TBP和MIBK百分比几乎相等时，溶剂MIBK含量较高时，酸回收率增加，而杂质含量则较低。确定了三元体系H3PO4-水-最佳溶剂混合物的相图，还获得了H3PO4和三种痕量金属杂质的分配比.Mg的相对纯化效果更好。最低的选择性是Fe，而Fe的选择性最低。当溶剂率提高时，其他微量元素不会改善。对于较高的溶剂混合率，可以获得最佳的纯化效果。而TBP的选择性最高与MIBK相比，溶剂混合物对H3PO4的萃取更具选择性。

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