Isomerization process with preliminary normal paraffin and mono-methyl paraffin feed capture step
US4855529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1988 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Apr 25, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C5/2791
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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 b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.