Production and separation of dimethyl biphenyl isomers
US10676413B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2019 |
| Grant date | Jun 9, 2020 |
| Priority date | — |
| Expiry date | Mar 27, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In a process for producing one or more 2,X′-dimethyl biphenyl isomers (where X=2, 3 or 4), a feed comprising toluene is contacted with hydrogen in the presence of a hydroalkylation catalyst under conditions effective to produce a hydroalkylation reaction product comprising (methylcyclohexyl)toluene. At least part of the hydroalkylation reaction product is dehydrogenated in the presence of a dehydrogenation catalyst under conditions effective to produce a dehydrogenation reaction product comprising dimethyl biphenyl isomers. The dehydrogenation reaction product is then separated into at least a first stream comprising one or more 3,3′-, 3,4′- and 4,4′-dimethyl biphenyl isomers and at least one second stream comprising one or more 2,X′-dimethyl biphenyl isomers (where X=2, 3 or 4). The at least one second stream is then contacted with a first adsorbent thereby selectively adsorbing one or more 2,X′-dimethyl biphenyl isomers (where X=2, 3 or 4) within said first adsorbent and then withdrawing from said first adsorbent a first extract stream comprising one or more selectively adsorbed 2,X′-dimethyl biphenyl isomers (where X=2, 3 or 4) and a first raffinate stream comprising one or more…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.