| 摘要 |
A process for recovering butadiene from a C4 fraction is disclosed. The process may include: contacting a mixed C4 stream comprising butane, butene, and butadiene, with a solvent comprising an organic solvent and water in a butadiene pre-absorber column to recover an overheads fraction comprising at least a portion of the butane, butene, and water, and a first bottoms fraction comprising the organic solvent, butadiene, and at least a portion of the butene; and feeding the first bottoms fraction to a butadiene extraction unit to recover a butene fraction, a crude butadiene fraction, and a solvent fraction. |
| 主权项 |
1. A system for recovering 1,3-butadiene from a C4 fraction, comprising:
a feed line for providing a hydrocarbon fraction containing butanes, butenes, 1,2-butadiene, 1,3-butadiene, C4 acetylenes, C3 acetylenes, and hydrocarbons; a butadiene extraction unit for receiving at least a portion of the hydrocarbon fraction and separating the hydrocarbon fraction into a 1,3-butadiene fraction, a C3 acetylene fraction, a C4 acetylene fraction, one or more fractions comprising the butanes and butenes, and a fraction comprising 1,2-butadiene and the C5+ hydrocarbons; a reactor for selectively hydrogenating at least one of the C3 acetylene fraction and the C4 acetylene fraction to produce a hydrogenated effluent comprising olefins, dienes, and oligomer byproducts; a separator for receiving the hydrogenated effluent and the fraction comprising the 1,2-butadiene and the C5+ hydrocarbons and to recover a heavies fraction comprising the C5+ hydrocarbons and the oligomer byproducts and a lights fraction comprising the olefins, dienes, and 1,2-butadiene; and a flow line for feeding the lights fraction to the butadiene extraction unit. |
