SEPARATION AND RECOVERY OF DIMERIZATION PRODUCT OF O-PHTHALIC DIESTER
PURPOSE:To separate and to recover a dimerization product, by removing a reacted raw material from a reaction solution formed by dimerization reaction of o-phthalic acid diester, subjecting the reaction solution to crystallization operation using a solvent to give S-BPTT and then collecting a-BPTT f...
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Zusammenfassung: | PURPOSE:To separate and to recover a dimerization product, by removing a reacted raw material from a reaction solution formed by dimerization reaction of o-phthalic acid diester, subjecting the reaction solution to crystallization operation using a solvent to give S-BPTT and then collecting a-BPTT from the mother liquor. CONSTITUTION:o-Phthalic acid diester is heated in the presence of a catalyst containing a bivalent palladium salt while feeding a gas containing molecular oxygen to the reaction system to dimerize the o-phthalic acid diester. The catalyst is removed from the prepared reaction solution, from which unreacted o-phthalic acid diester is removed to give a reaction product mixture having |
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