Production of propylene from butane
AssigneeLummus Technology Inc.
InventorsKerman Dukandar, David Spence, Sunil Panditrao
Life of this patent
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Abstract
This invention relates to an integrated process for the efficient production of olefins from C4 feedstocks comprising butane and more particularly to a method of producing propylene and butadiene. The process combines a dehydrogenation unit with an olefin conversion unit to convert butane feedstock to propylene and butadiene products. The combined catadiene-OCT process produces yields of propylene from normal butane in excess of 70%.
Claims14
A process for producing olefins comprising the steps of:
- (a) feeding a stream comprising butane to a dehydrogenation unit containing a catalyst for converting butane to butenes and butadiene to produce a dehydrogenation unit product stream;
- (b) feeding the dehydrogenation unit product stream to a butadiene extraction unit to produce a butadiene product stream and a raffinate stream;
- (c) feeding the raffinate stream to a selective hydrogenation unit configured to convert butadiene to butene to produce a selective hydrogenation unit product stream;
- (d) feeding the selective hydrogenation unit product stream and a stream comprising ethylene to an olefin conversion unit to react the butenes with ethylene form propylene;
- and
- (e) recovering the propylene.
A process for producing olefins comprising the steps of:
- (a) feeding a stream comprising butane to a dehydrogenation unit containing a catalyst for converting butane to butenes and butadiene to produce a dehydrogenation unit product stream;
- (b) feeding the dehydrogenation unit product stream to a butadiene extraction unit to produce a butadiene product stream and a raffinate stream comprising butenes and residual butadiene;
- (c) feeding the raffinate stream to a selective hydrogenation unit capable of converting the residual butadiene to butenes to produce a selective hydrogenation unit product stream;
- (d) feeding the selective hydrogenation unit product stream to a deisobutenizer capable of separating isobutane and isobutene from the hydrogenation unit product stream to produce an isobutane/isobutene stream and a deisobutenizer product stream;
- (e) feeding the deisobutenizer unit product stream and a feed stream comprising ethylene to an olefin conversion unit capable of reacting butenes with ethylene to form propylene to form an olefin conversion unit product stream;
- and
- (f) recovering propylene from the olefin conversion unit product stream.
A system for producing butadiene and propylene comprising:
- a dehydrogenation unit capable of converting butane to butenes and butadiene;
- a butadiene extraction unit;
- and
- an olefin conversion unit capable of converting butenes to propylene.
Dependencies are inferred from the claim text.