Patent ID: 6338791
Filing Date: 2002-01-15
Classification: C10G,C10L

Abstract:
A process for producing a gasoline stock by hydroisomerization, said process comprising separating in at least one separation section at least one fraction of a C5 to C8 stream containing at least C-7 paraffins, straight-chain paraffins, mono-, di-, and tri-branched paraffins; and optionally naphthenes and aromatic compounds, into (1) a C5-C8 stream rich in di- and tri-branched paraffins and containing C7-di-branched paraffins and (2) at least one fraction of a C5-C8 effluent rich in straight chain and mono-branched paraffins; wherein said at least one fraction of said C5-C8 effluent comprises a first effluent stream rich in straight chain hydrocarbons and a second effluent stream rich in mono-branched paraffins; subjecting said first effluent stream to hydroisomerization in a first section; and combining the resultant hydroisomerizate from said first section with said second stream rich in mono-branched paraffins, subjecting the resultant combined stream to hydroisomerization in a second hydroisomerization section operated under conditions different from the first hydroisomerization section; and recycling said at least one fraction of the resulting C5-C8 hydromerizate from the second hydroisomerization section to said at least one separation section, and passing stream (1) to a gasoline pool to provide a minimum content of C7-di-branched paraffins of 2% by weight.