| 摘要 |
<p>Separation of olefin with three carbon atoms from olefin with four carbon atoms comprises a fractionating step (3C/4C separation) using an unit (olefin unit) in the preparation of olefins from hydrocarbon-containing feedstock. Separation of olefin with three carbon atoms from olefin with four carbon atoms comprises a fractionating step (3C/4C separation) using an unit (olefin plant) in the preparation of olefins from hydrocarbon-containing feedstock, where the long-chained olefins of the hydrocarbon-containing feedstock are converted into a gas mixture of relatively short-chained olefin products (raw gas), which is compressed and dried; during the 3C/4C-separation the raw gas is led over an absorber (C4-absorber) operated with a full raw gas pressure and over a separating column (depropanizer) for olefins with up to three carbon atoms and olefins with at least four carbon atoms; and the depropanizer is operated at 8-12 bar.</p> |
