INORGANIC ION EXCHANGER FOR REMOVAL OF ALKALI METALS FROM ORGANIC SOLVENT AT HIGH TEMPERATURE AND HIGH PRESSURE

摘要

Ion exchangers are provided to prepare metal phosphate compounds that are highly resistant to an organic solvent, and can maintain activity at high temperatures, wherein the prepared metal phosphate compounds include zirconium phosphate, titanium phosphate, and zirconium titanium phosphate in which an element ratio of zirconium/titanium is from 3/1 to 1/3, the metal phosphate compounds are prepared by a sol-gel process, and the element ratio of zirconium/titanium is varied to maximize ion exchange capability. An ion exchanger for the removal of an alkali metal ion from an organic solvent with a high temperature of 200 to 400 deg.C and a high pressure of 5 to 15 bars comprises a metal phosphate compound selected from the group consisting of zirconium phosphate(Zr[HPO4]2.H2O), titanium phosphate(Ti[HPO4]2.H2O), and zirconium titanium phosphate(Zr1-xTix[HPO4]2.H2O), where x is 0.25 to 0.75. The metal phosphate compound is zirconium titanium phosphate(Zr1-xTix[HPO4]2.H2O), where x is 0.25 to 0.75. The ion exchanger has a zirconium/titanium element ratio of 1/3. The organic solvent is methanol, ethanol, NMP(N-methyl-2-pyrrolidone), LCO(light crystal oil), 1-MN(1-methylnaphthalene), or DMN(dimethylnaphthalene). The alkali metal ion Na^+ or K^+.