Isomerization process with preliminary normal paraffin and mono-

Details Isomerization process with preliminary normal paraffin and mono- Isomerization process with preliminary normal paraffin and mono-

1988-04-25

1989-08-08

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Saturated compound synthesis

By isomerization

585738, 585739, 585820, 585821, 585822, 208310R, 208310Z, C07C 527

Patent

active

048555290

ABSTRACT:
This invention relates to a process for increasing the octane of a refinery gasoline pool by segregating components which are increased in value by isomerization from those which are diminished in octane value by isomerization. The preferred feed stream of this process comprises di-branched paraffins, mono-methyl-branched paraffins and normal paraffins from which mono-methyl-branched and normal paraffins are selectively captured by a shape-selective molecular sieve. The preferred separatory shape-selective molecular sieve has a pore size of 5.5.times.5.5 to 4.5.times.4.5A but excluding 4.5.times.4.5A. Mono-methyl-branched paraffins and normal paraffins are removed from the shape-selective molecular sieve and isomerized in an isomerization zone to form di-methyl branched paraffins. An isomerization zone effluent stream is produced comprising unisomerized normal paraffins, mono-methyl-branched paraffins and di-branched paraffins. It is within the scope of this invention for the isomerization zone effluent stream (isomerate) to undergo further separation wherein a recycle stream is generated comprising normal paraffins or normal paraffins and mono-methyl-branched paraffins which can be returned to the isomerization zone. The isomerization zone effluent stream is separated by means of a calcium 5A aluminosilicate, a ferrierite aluminosilicate or a combination thereof.

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