Process for purification of ortho-chlorotoluene
US5143685A · kind A · utility
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10Claims
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Key dates
| Filing date | Dec 28, 1988 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Dec 28, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/389
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for separating the ortho-isomer of chlorotoluene from a feed mixture containing ortho- and para-chlorotoluene by selective adsorption and desorption with an L zeolite adsorbent having potassium or potassium and sodium cations at cation exchange sites and a desorbent containing chlorobenzene or mixtures thereof with a saturated aliphatic hydrocarbon and especially 10-50% chlorobenzene and 50-90% saturated aliphatic hydrocarbon. The ortho-chlorotoluene is relatively non-absorbed on the adsorbent and is recovered prior to more strongly adsorbed species in a rejective separation process.
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