摘要:
The present system discloses a transfer system devised in order to produce optimal flow from the first to the second loop reactor, by connecting the transfer lines to a by-pass line and by separating the connecting points of the transfer lines into the by-pass line by at least 70 cm.
摘要:
The present invention relates to a process for recycling product streams that have been separated from a hydrocarbon-containing feed stream comprising olefin monomer, olefin co-monomer, hydrocarbon diluent and components such as H 2 , N 2 , O 2 , CO, CO 2 , and formaldehyde. In accordance with the present process a hydrocarbon-containing feed stream is separated into a) a first side stream comprising hydrocarbon diluent and olefin monomer; b) a second side stream which is substantially hydrogen-free and comprises hydrocarbon diluent and olefin monomer, c) a bottom stream comprising substantially olefin-free hydrocarbon diluent, and d) an overhead vapor stream comprising olefin monomer, hydrocarbon diluent and components such as formaldehyde, H 2 , N 2 , O 2 , CO and CO 2 , The present process further includes recycling said first and said second side streams in a polymerization process for preparing bimodal polyolefin.
摘要:
The present invention relates to a process for optimizing the separation by distillation of a hydrocarbon-containing feed stream comprising olefin monomer, co-monomer and hydrocarbon diluent. A preferred component stream separated comprises ethylene, 1-hexene and isobutane. A first distillation column (2) realizes a rough cut between a mixture of isobutane, hexene and the heavies (5). The heavy bottom product is treated in a second distillation column (4) and separated into isobutane vapor (6), a purified liquid hexene stream (7) and the heavy components (8). The remaining monomer, isobutane, which exits from the top (9) of the first distillation column (2), is sent to a third distillation column (3) to be sepatated into isobutane as liquid bottom (10), light components, ethylene and residual isobutane as a vapor stream (12) and remaining isobutane exits as a liquid side stream (11). The distillation system comprises controller means such as ratio controller (not shown), for adapting the ratio of the bottom stream flow removed from the third distillation zone to the overhead stream flow introduced in the third distillation zone.