Process for removing .alpha.-acetylenes from diolefins
US4266086A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1980 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Feb 12, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/148
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Conjugated diolefins contaminated with relatively high levels of acetylenic impurities in a hydrocarbon feedstream are purified by a cyclic, liquid phase, predominantly catalytic cracking process which selectively removes alpha-acetylenes in a single pass. The energy requirement for removing the alpha-acetylenes in this liquid phase process are from about one-third to about one-fifth as great as that required in a comparable vapor phase process. A feedstream containing about equal weights of butadiene and mixed monoolefins and alkanes contaminated with alpha-acetylenes including vinyl acetylene and methyl acetylene, inter alia, in an amount up to about 1.0 percent by weight (% by wt) of the feedstream, is contacted in the liquid phase with a supported Group I B metal oxide catalyst in the absence of hydrogen, at a temperature in the range from about 200.degree. F. to about 260.degree. F. Despite the relatively high temperature range at which butadiene monomer is contacted with the catalyst for a relatively long time, the loss of diolefin due to polymerization is less than 1% by wt, due to the use of an inhibitor which inhibits polymerization but does not affect the performance of t…
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