Two-stage adsorptive separation process for purifying...

Details Two-stage adsorptive separation process for purifying... Two-stage adsorptive separation process for purifying...

C - Chemistry, Metallurgy

07

C

182/6.5

C07C 15/24 (2006.01) C07C 7/13 (2006.01)

Patent

CA 1318860

"TWO-STAGE ADSORPTIVE SEPARATION PROCESS FOR PURIFYING 2,6 DIMETHYLNAPHTHALENE" ABSTRACT Purified 2,6 Dimethylnaphthalene ["2,6-DMN"] is recovered from a fresh feed mixture comprising 2,6-DMN and at least one isomer thereof by contacting the feed mixture in a first stage, employing a first stage adsorbent comprising potassium-exchanged X zeolite and operating at 2,6-DMN rejective conditions, passing at least a portion of the raffinate product of such first stage to a second stage, employing a second stage adsorbent comprising potassium-exchanged X zeolite or a carbon material and operating at 2,6-DMN extractive conditions, and thereafter producing a second stage extract product containing purified 2,6-DMN by desorbing the adsorbed 2,6- DMN from the second stage adsorbent with a desorbent comprising toluene or chlorobenzene.

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