Adsorption and isomerization of normal and mono-methyl paraffins

Details Adsorption and isomerization of normal and mono-methyl paraffins Adsorption and isomerization of normal and mono-methyl paraffins

1990-09-11

1991-10-08

Pal, Asok

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By contact with solid sorbent

585821, 585825, C07C 713, C07C 7135

Patent

active

050556339

ABSTRACT:
Processes are disclosed for separating by adsorption lower octane normal and mono-methyl paraffins from hydrocarbon feeds containing normal, mono-methyl and more highly branched paraffin fractions in the pentane and hexane carbon range. Adsorbents capable of adsorbing mono-methyl paraffins but not di-methyl branched paraffins are employed to adsorb normal and mono-methyl branched parafins. Isopentane, although adsorbed along with the mono-methyl hexane paraffins, is preferentially adsorbed and eluted from the adsorber bed and recovered as an adsorption effluent along with di-methyl branched hexane paraffin. In one aspect of the invention adsorbents capable of adsorbing normal paraffins but not mono-methyl paraffins are additionally employed to pretreat the feeds to adsorb normal paraffins. Isomerization processes are disclosed for isomerizing the normal and mono-methyl paraffins to produce higher-octane isopentane and more highly branched paraffins.

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