Process for paraffin isomerization of a distillate range...

Details Process for paraffin isomerization of a distillate range... Process for paraffin isomerization of a distillate range...

C - Chemistry, Metallurgy

07

C

260/713.4

C07C 5/27 (2006.01) C07C 9/22 (2006.01)

Patent

CA 1312883

F-4648 A PROCESS FOR PARAFFIN ISOMERIZATION OF A DISTILLATE RANGE HYDROCARBON FEEDSTOCK ABSTRACT A process for paraffinic isomerization of a hydrocarbon feedstock, which has a paraffin content having no more than 20 carbon atoms per molecule, comprises contacting the feedstock with a crystalline aluminosilicate zeolite catalyst having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than 3, which sorption is determined at a P/Po of 0.1 and at a temperature of 50°C for n-hexane and 80°C for o-xylene and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 540°C (1000°F) and 101 kPa (1 atmosphere) pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k3MP/kDMB determined at a temperature of 540°C (1000°F) being in excess of 2, e.g., ZSM-22, ZSM-23, ZSM-35 and mixtures thereof. The catalyst is combined with a Group VIII metal, and has a zeolite SiO2/Al2O3 ratio of at least 20:1.

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