Novel production process of metal alkoxide by using solvent extraction technique

从1990年到1993年，对溶剂萃取法生产金属醇氧化合物的新工艺进行了基础研究，该工艺可以用特定的萃取剂从氯水溶液中选择性地提取目标金属的氯配合物，低压蒸馏去除共萃取的水和氯离子，并与醇和氨进行合成反应。主要的反对金属是铁，因为其优越的可提取性。研究结果表明，最佳萃取剂必须具备以下条件：1)沸点低，蒸馏分离简单。2)在低HCl浓度下碱性高，可萃取性高。3)含水量低的提取种。4)与金属醇盐结合力弱。5)在水中溶解度低。在所研究的萃取剂中，TOPO（三辛基-氧化膦）和IPE（异丙酯）可以有效地用作溶剂萃取剂，而TOA（三辛基-胺）可以有效地用作碱性萃取剂。对金属烷氧化物的生产工艺得到了新的认识。萃取工艺-在高HCl浓度和高金属含量的有机相中，可以减少有机相中的含水量。然而，后者比前者更有效。TOPO和TOA均可在萃取阶段提取不含水的氯配合物。低压蒸馏法——由于乙醇的共沸作用，在IPE中三段即可充分脱除萃取水，并可用于金属烷氧化物的合成反应。合成工艺-较低温的合成反应是有利的。分离工艺——形成铁-乙氧基-铵化合物可分离TOPO或TOA，在低压蒸馏下可从低沸点的萃取剂中分离合成烷氧基。采用溶剂萃取技术，利用特定的萃取剂，在低温条件下与醇、氨反应，从含有多种金属离子的金属氯溶液中选择性地提取出不含水的目标金属氯配合物，从而实现了不同于传统生产金属烷氧化物的新工艺。少

The fundamental study on the novel production process of metal alkoxide by solvent extraction technique which can selectively extract the chlorocomplex of the objected metal from aqueous chloride solution with specificextractant, removal of the coextracted water and chloride ion by distillation under low pressure and synthesis reaction with alcohol and ammonia was conducted from 1990 to 1993. The predominant objected metal was ferric iron because of its superior extractability.It was found from the research results that the following properties were indispensable for the optimal extractant.1) low boiling point and simple separation by distillation.2) high basicity and high extractability in the low HCl concentration.3) extracted species containing low water content.4) weak bonding strength with metal alkoxide.5) low solubility in water.Among the various investigated extractants, TOPO(Tri-octyl-phosphine oxide) and IPE(Iso-propyl-ehter) can be effectively used as solvated extractant and … More TOA(Tri-octyl-amine) as basic extractant.The new information was obtained with respect to the production process of metal alkoxyde. Extraction process - Reduction of water content in the organic phase is obtainable in high HCl concentration and high metal content in the organic phase. However, the latter is more effective than the former. TOPO and TOA can extract the chlorocomplex containing no water content in the extraction stage. Distillation process under low pressure - The sufficient removal of the extracted water in IPE is possible with 3 stages as a result of azeotropic effect of ethanol and can be offered to the synthesis reaction of metal alkoxyde. Synthesis process - Synthesis reaction in lower temperature is favarable. Separation process - The separation of TOPO or TOA is possible by the formation of Iron-ethoxyde-ammonium compound and the synthetic alkoxyde can be separated from the extractant having low boiling point by distillation under low pressure.The novel production process of metal alkoxyde different from the conventional process was found to be possible by solvent extraction technique which can selectively extract the chlorocomplex of the objected metal containing no water content from the aqueous metal chloride solution involving various metallic ions with specific extractant and synthesis reaction with alcohol and ammonia in low temperature. Less