초록 ▼

The separation of the para-isomer of a dialkyl benzene from a mixture of the isomers thereof, especially p-xylene, by contacting the mixture at adsorption conditions with a type X or type Y zeolite adsorbent, ion exchanged with barium and potassium, and recovering the para-alkylbenzene from the adso

The separation of the para-isomer of a dialkyl benzene from a mixture of the isomers thereof, especially p-xylene, by contacting the mixture at adsorption conditions with a type X or type Y zeolite adsorbent, ion exchanged with barium and potassium, and recovering the para-alkylbenzene from the adsorbent by contacting the adsorbent with fluorobenzene or a difluorobenzene at desorption conditions.

대표청구항 ▼

A process for separating the para-isomers of a dialkyl-substituted aromatic hydrocarbon from a mixture of said para-isomer and at least one other isomer of said aromatic hydrocarbon which process comprises contacting said mixture with a crystalline aluminosilicate adsorbent containing barium and pot

A process for separating the para-isomers of a dialkyl-substituted aromatic hydrocarbon from a mixture of said para-isomer and at least one other isomer of said aromatic hydrocarbon which process comprises contacting said mixture with a crystalline aluminosilicate adsorbent containing barium and potassium at exchangeable cationic sites within the adsorbent crystalline structure in a BaO/K2O molar ratio of from about 0.6 to 1.2 at adsorption conditions selected to effect the adsorption of said para-isomer by said adsorbent and subsequently contacting said adsorbent with a desorbent material comprising a difluorobenzene selected from the group consisting of meta-difluorobenzene and ortho-difluorobenzene and mixtures thereof at desorption conditions to effect the removal of said para-isomer from said adsorbent and recovering from said adsorbent a stream concentrated in said para-isomer.