Patent ID: 8766029

Claim:
A process for providing a vaporous purified crude C 4 cut, the process comprising: removing C 4 oligomers and polymers and C 5+ hydrocarbons from a liquid crude C 4 cut feed stream, that comprises butanes, butenes, 1,3-butadiene, C 3 hydrocarbons, the C 4 oligomers and polymers, and the C 5+ hydrocarbons, thereby forming a purified liquid crude C 4 cut that comprises residual contents comprising less than two thirds of the C 5+ hydrocarbons and less than 5% by weight of the C 4 oligomers and polymers present in the feed stream, and vaporizing the purified liquid crude C 4 cut in a vaporizer vessel, thereby obtaining a vaporous purified crude C 4 cut wherein the vaporizer vessel is assigned a stripping column having one or more plates, to which the liquid crude C 4 cut feed stream is supplied in the upper region thereof, which is in direct gas and liquid exchange with the vaporizer vessel in the lower region thereof, and from which the vaporous purified crude C 4 cut is drawn off in the upper region thereof, the stripping column being operated without a condenser at the top of the column.