Inhibiting polymerization in extractive distillation of C-4 hydrocarbons using alkoxynitrile-containing solvent
US4268361A · kind A · utility
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7Claims
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Key dates
| Filing date | May 19, 1980 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | May 19, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S585/95
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Formation of butadiene-1,3 polymer during the extractive distillation of a C-4 hydrocarbon mixture to separate and purify butadiene-1,3 using a solvent composition in which an alkoxynitrile is present in a proportion of 50-99 percent by weight, is decreased through inclusion in the solvent of a synergistic combination of 2,4-dinitrophenol and phosphoric acid, each in a proportion of 0.05 to 0.5 percent by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.