Isomerization process with recycle of mono-methyl-branched paraffins and normal paraffins
An isomerization process is described to produce an isomerate product stream comprising a gasoline blending component from a hydrocarbon stream comprising C/sub 6/ normal paraffin, C/sub 6//sup +/ normal paraffins or mixtures thereof. The process consists of the combinative steps of: (a) passing the paraffin or mixtures of paraffins to an isomerization zone maintained at isomerization conditions and containing an isomerization catalyst to produce an isomerization zone effluent steam comprising di-branched paraffins, mono-methyl-branched paraffins, and unreacted normal paraffins; (b) passing the isomerization zone effluent stream to a separation zone containing multiple crystalline molecular sieves, each having pore sizes of different dimensions, wherein the first of the sieves has pores of a dimension effective to adsorb normal paraffins while being restrictive to prohibit adsorption of meno-methyl-branched paraffins and di-branched paraffins and wherein the second of the sieves has a pore size intermediate 5.5 x 5.5 and 4.5 x 4.5 A and is effective to adsorb normal paraffins and mono-methyl-branched paraffins while restrictive to prohibit adsorption of di-branched paraffins.
- Assignee:
- Shell Oil Co., Houston, TX
- Patent Number(s):
- US 4804802
- OSTI ID:
- 6160123
- Country of Publication:
- United States
- Language:
- English
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