Abstract
The process of supercritical fluid extractive regeneration of the ion-exchange catalyst KU-2FPP was studied. The use of pure supercritical carbon dioxide (SC-CO 2 ) and the one modified with a polar additive (H 2 O) as the extractant in the process at T = 383÷393 K and P = 15÷25 MPa provided an effective removal of non-polar organic compounds and the occurrence of the side carboxylation reaction to form dialkylphthalate. The side reaction was supposed to bear responsibility for the ineffective regeneration in the presence of SC-CO 2 as the extractant. The application of supercritical propane-butane mixture as the extractant (T = 393 K, P = 10÷15 MPa) allowed the catalyst activity to be restored to the level appropriate for the industrial application.
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