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-

1989-02-24

1991-01-01

Garvin, Patrick P.

Chemistry of hydrocarbon compounds

Saturated compound synthesis

By isomerization

585738, 585820, 585822, 585737, 585734, 2083102, C07C 513

Patent

active

049820486

ABSTRACT:
This invention relates to a process for increasing the octane of a refinery gasoline pool by segregating components of a feed stream to increase the value of select components by isomerization and to prevent isomerization of other components already having a high octane value. The preferred feed stream of this process comprises di-branched paraffins, mono-methyl-branched paraffins and normal paraffins. Two or more different separatory sieves are used prior to isomerization. A first separatory shape-selective molecular sieve has a pore size of 4.5.times.4.5A or smaller to adsorb normal paraffins. A second 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. These sieves may be situated in a series flow arrangement. Normal paraffins are adsorbed by the first sieve. Mono-methyl-branched paraffins are adsorbed by the second sieve. The paraffins captured by both sieves are desorbed to form an isomerization zone feed stream which is isomerized to produce additional di-methyl branched paraffins. The isomerization zone effluent stream can undergo further separation to provide a recycle stream comprising normal paraffins or normal paraffins and mono-methyl-branched paraffins in addition to an isomerate stream comprising di-branched paraffins. The separation zone located on the feed stream is exemplified by a first shape-selective molecular sieve comprising a calcium-5A aluminosilicate and a second separatory shape-selective sieve comprising a ferrierate aluminosilicate molecular sieve.

REFERENCES:
patent: 3755144 (1973-08-01), Asselin
patent: 3836455 (1974-09-01), Blytas
patent: 4176053 (1979-11-01), Holcombe
patent: 4210771 (1980-07-01), Holcombe
patent: 4251499 (1981-02-01), Nanne et al.
patent: 4476345 (1984-10-01), Gray, Jr. et al.

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