| abstract |
PURPOSE: A Y-type zeolite containing potassium ion as an essential component is used as adsorbent to repeat adsorption and desorption, thus separating the title compounds, especially the p-isomer from a mixture of halogenated toluene isomers continuously. n CONSTITUTION: Using a Y-type zeolite containing potassium ion as an essential component such as crystalline aluminosilicate belonging to faujasite, a mixture of halogenated toluene isomers are brought into contact with the adsorbent and the isomers are isolated. Usually the Y-type zeolite containing potassium ion is prepared by substituting the sodium-containing Y-type zeolite ionically with potassium sulfate. The potassium ion exchange rate is more than 50%, preferably more than 70%. The present invention is suitably applied to the isolation of chlorotoluene or bromotoluene isomers. n COPYRIGHT: (C)1982,JPO&Japio |