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US 5,955,640 AGranted
Integrated process for the production of butene-1
AssigneesEnichem S.p.A., Snamprogetti S.p.A.
InventorsRenato Paludetto, Alfredo Orsi, Roberto Trotta, Gianni Donati
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Abstract
Integrated process for the production of butene-1 which comprises feeding a C.sub.4 hydrocarbon stream to a separation unit of butene-1 and recycling the remaining stream to the same unit after treatment in a bond isomerization section to convert the remaining butenes-2 into butene-1, a molecular sieve separation unit is inserted in the cycle operating with the hydrocarbons in a vapour phase, for the purge of the paraffins.
Claims20
Integrated process for the production of butene-1 which comprises:
- a) feeding a fresh feed of a C.sub.4 hydrocarbon stream, consisting essentially of linear butenes, butanes and, optionally, butadiene together with a recycled stream rich in butene-1 and optionally containing traces of butadiene, to a selective hydrogenation section of butadiene and optionally acetylenic compounds;
- b) feeding the hydrogenated stream basically without butadiene and acetylenic compounds to a separation section of butene-1 to obtain a stream consisting of high purity butene-1 (>99%) and a remaining hydrocarbon stream consisting essentially of paraffins and olefins (butene-1 and butenes-2);
- c) sending the remaining hydrocarbon stream, or a fraction thereof, in a vapour phase to a molecular sieve separation section for the separation of the paraffins (consisting essentially of butanes) from the olefins (consisting essentially of butenes 1 and 2), the recovery of the olefins and the purge of the paraffins;
- d) sending the hydrocarbon stream containing the recovered olefins, together with an optional fraction not fed in step (c), to a bond isomerization section for the transformation of the cis and trans butenes-2 to butene 1;
- e) recycling the isomerized stream to the selective hydrogenation section (a) after mixing with the fresh feed C.sub.4 hydrocarbon stream.
2 more elements
Integrated process for the production of butene-1 which comprises:
- a') feeding a fresh feed of a C.sub.4 hydrocarbon stream, consisting essentially of linear butenes, butanes and, optionally, butadiene, as well as optional traces of acetylenic compounds, together with a recycled stream rich in butene-1 and optionally containing traces of butadiene, to a selective hydrogenation section of butadiene and optional acetylenic compounds;
- b') sending the hydrogenated hydrocarbon stream, or a fraction thereof, in a vapour phase to a molecular sieve separation section for the separation of the paraffins (consisting essentially of butanes) from the olefins (consisting essentially of butenes 1 and 2), the recovery of the olefins and the purge of the paraffins;
- c') sending the hydrocarbon stream containing the recovered olefins, together with an optional fraction not fed in step (b'), to a separation section of butene-1 to obtain a stream consisting of high purity butene-1 (>99%) and a remaining hydrocarbon stream consisting essentially of paraffins and olefins (butene-1 and butenes-2);
- d') sending the remaining hydrocarbon stream to a bond isomerization section for the transformation of the cis and trans butenes-2 to butene-1;
- e') recycling the isomerized stream to the selective hydrogenation section (a') after mixing with the fresh feed C.sub.4 hydrocarbon stream.
2 more elements
Dependencies are inferred from the claim text.