| 摘要 |
High purity butene-1, in particular polymerization grade butene-1, is obtained by means of a two-stage fractionation of a C4 hydrocarbon stream comprising butene-1 which is substantially free from butadiene. The first stage of the fractionation process allows practically all the isobutane contained in the C4 batch to be separated as the top stream. The bottom phase of the first stage of fractionation is supplied to the second stage of fractionation thus obtaining high purity butene-1 as the top fraction, and the remaining components as the bottom phase According to the process of the invention, vapors of butene-1 obtained as the top stream from the second stage of fractionation are compressed and the resultant heat of condensation is used for operating the reboilers of the two fractionation stages. |
