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US 7,304,193 B1Granted
Integrated process for aromatics production
AssigneeUop LLC
InventorsStanley J. Frey, Gavin P. Towler
Life of this patent
Estimating the term…
Abstract
An aromatics complex flow scheme has been developed. The isomerized xylenes effluent from a xylene recovery zone is recycled to a transalkylation stripper without requiring C8 aromatic hydrocarbons to be separated. This improvement results in an aromatics complex with savings on capital and utility costs and an improvement on the return on investment in such a complex.
Claims19
A process for producing benzene and para-xylene from a catalytic reformate stream comprising the steps of:
- (a) providing the reformate stream to a first olefin saturation zone, wherein said stream is contacted with an olefin saturation catalyst under olefin saturation conditions to produce an olefin-treated reformate stream;
- (b) separating the olefin-treated reformate stream, an isomerization product stream, and a transalkylation product stream, or a combined stream thereof, in a transalkylation stripper zone to produce a benzene and lighter hydrocarbon enriched stream and a toluene and heavier hydrocarbon enriched stream;
- (c) passing the benzene-enriched stream to an extractive-distillation zone to produce a raffinate stream and a benzene product which is recovered as a product stream from said process;
- (d) passing the toluene and heavier hydrocarbon enriched stream of step (b) to a toluene column to produce a toluene-enriched stream and a xylenes-plus-enriched stream;
- (e) passing toluene-enriched stream and a stream from a xylene column rich in C9 and C10 alkyl aromatics, or a combined stream thereof, to a transalkylation zone, wherein said streams are contacted with a metal-stabilized transalkylation catalyst under transalkylation conditions to produce the transalkylation product stream of step (b);
- (f) separating the xylene-plus-enriched stream of step (d) in a xylene fractionation zone to produce an overhead xylene stream and the stream from a xylene column rich in C9 and C10 alkylaromatics of step (e);
- (g) passing the overhead xylene stream to a para-xylene separation zone, wherein para-xylene is concentrated into a para-xylene enriched product stream which is recovered as a product stream of the process, and a para-xylene separation zone effluent stream;
- and
- (h) passing the para-xylene separation zone effluent stream to a xylenes isomerization zone to contact an isomerization catalyst under isomerization conditions and produce the isomerization product stream of step (b).
6 more elements
A process for producing benzene and para-xylene from a naphtha feedstock comprising the steps of:
- (a) providing a naphtha feed feedstock stream to a hydrotreating zone, wherein the feedstock is contacted with a hydrotreating catalyst under hydrotreating conditions to produce a hydrotreated naphtha stream;
- and
- (b) passing the hydrotreated naphtha stream to a reforming zone, wherein said hydrotreated naphtha is contacted with a reforming catalyst under reforming conditions to produce a reformate stream comprising aromatic components and light end hydrocarbons;
- (c) separating the reformate stream, a transalkylation product stream, and an isomerization product stream, or a mixture thereof, in a transalkylation stripper zone to produce a benzene and lighter hydrocarbons enriched stream and a toluene and heavier hydrocarbons enriched stream;
- (d) passing the benzene and lighter hydrocarbons enriched stream to an extractive-distillation zone to produce a raffinate stream and a benzene product which is recovered as a product stream from the process;
- (e) passing the toluene and heavier hydrocarbons enriched stream of step (c) to a toluene column to produce a toluene-enriched stream and a xylenes-plus-enriched stream;
- (f) passing the toluene-enriched stream and a stream from a xylene column rich in C9 and C10 alkyl aromatics, or a mixture thereof, to a transalkylation zone, wherein said streams are contacted with a metal-stabilized transalkylation catalyst under transalkylation conditions to produce the transalkylation product stream of step (c);
- (g) separating the xylenes-plus-enriched stream of step (e) in a xylene fractionation zone to produce an overhead xylene stream and the stream from a xylene column rich in C9 and C10 alkylaromatics of step (f);
- (h) passing the overhead xylene stream to a para-xylene separation zone, wherein para-xylene is concentrated into a para-xylene enriched product stream which is recovered as a product stream of the process, and a para-xylene separation zone effluent stream;
- and
- (i) passing the para-xylene separation zone effluent stream to a xylenes isomerization zone to contact an isomerization catalyst under isomerization conditions and produce the isomerization product stream of step (c).
8 more elements
Dependencies are inferred from the claim text.