Isomerization process with recycle of mono-methyl-branched paraffins and normal paraffins
US4804802A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1988 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Jan 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 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-dime…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.