Chemistry of hydrocarbon compounds – Saturated compound synthesis – By isomerization
Patent
1988-01-25
1989-02-14
Garvin, Patrick P.
Chemistry of hydrocarbon compounds
Saturated compound synthesis
By isomerization
585738, 585737, 585820, 585822, 208310Z, C07C 527
Patent
active
048048020
ABSTRACT:
This invention relates to a process for the production of an isomerate gasoline blending component where the octane value of the isomerate is increased relative to prior art processes utilizing single separatory sieves. After respective isomerization of feed streams comprising C.sub.6 or C.sub.6.sup.+ normal paraffins, a multiple separatory sieve is located to selectively adsorb unreacted normal paraffins and mono-methyl-branched paraffins from an isomerate product stream. The preferred first separatory sieve is exemplified by a calcium 5A sieve which can adsorb normal paraffins while allowing mono-methyl-branched paraffins and more higly branched paraffin to pass to a second separatory sieve. The second sieve comprises a shape-selective zeolite having a pore size intermediate 5.5.times.5.5 and 4.5.times.4.5A to selectively adsorb said mono-methyl-branched paraffins while allowing the more highly branched paraffins to pass through or along the separatory sieve and become the isomerate product blending component. The preferred second separatory molecular sieve is exemplified by a ferrierite which can adsorb methylpentane while allowing more highly branched materials such as 2,3-dimethylbutane to pass through or along the sieve. At least a portion of both the normal paraffin and the mono-methyl-branched paraffins are recycled to the isomerization zone of the process. The separatory sieves may be located in a vertical relationship (either upflow or downflow) or in a horizontal relationship.
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Evans Wayne E.
Stem Stephen C.
Fourson George R.
Garvin Patrick P.
Muller Kimbley L.
Shell Oil Company
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