Apparatus for separating para-xylene from a mixture of c8 and c9 aromatic hydrocarbons
AssigneeUop LLC
InventorsLeonid Bresler, Stanley J. Frey
Life of this patent
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Abstract
The apparatus includes at least two adsorptive separation zones to separate para-xylene from a feed stream comprising C8 aromatic hydrocarbons and at least one C9 aromatic hydrocarbon component. The first adsorptive separation zone delivers a raffinate stream to a raffinate distillation zone and an extract stream to an extract distillation zone. The raffinate distillation zone delivers a stream to the second adsorptive separation zone and at least one of the extract distillation zone and raffinate distillation zone delivers a recycle stream to the first adsorptive separation zone.
Claims20
An apparatus for separating para-xylene from a feed stream comprising C8 aromatic hydrocarbons and at least one C9 aromatic hydrocarbon component, the apparatus comprising:
- (a) a first adsorptive separation zone for separating para-xylene from the feed stream comprising a first adsorbent chamber containing a first adsorbent;
- (b) a feed conduit providing fluid communication of the feed stream to the first adsorptive separation zone;
- (c) a desorbent conduit providing fluid communication of a first desorbent component to the first adsorptive separation zone;
- (d) a first extract distillation zone comprising an extract distillation column;
- (e) a first extract conduit providing fluid communication from the first adsorptive separation zone to the first extract distillation zone;
- (f) a raffinate distillation zone comprising a raffinate distillation column;
- (g) a first raffinate conduit providing fluid communication from the first adsorptive separation zone to the raffinate distillation zone;
- (h) a second adsorptive separation zone for separating the C9 aromatic hydrocarbon component from the first desorbent component comprising a second adsorbent chamber containing a second adsorbent;
- (i) a C9 aromatic hydrocarbon conduit providing fluid communication of a second feed stream comprising the C9 aromatic hydrocarbon component and the first desorbent component from the raffinate distillation zone to the second adsorptive separation zone;
- (j) a recycle conduit providing fluid communication of the first desorbent component from at least one of the first extract distillation zone and the raffinate distillation zone to the first adsorptive separation zone;
- and
- (k) a second desorbent component conduit providing fluid communication of a second desorbent component to the second adsorptive separation zone.
An apparatus for separating para-xylene from a feed stream comprising C8 aromatic hydrocarbons and C9 aromatic hydrocarbons, the apparatus comprising:
- (a) a simulated moving bed adsorptive separation zone for separating para-xylene from the feed stream comprising:
- (i) an adsorbent chamber having at least eight transfer points, the transfer points providing fluid communication with a first adsorbent contained within the adsorbent chamber;
- (ii) a fluid distributor comprising a feed inlet, a desorbent inlet, a raffinate outlet, an extract outlet;
- and (iii) at least one transfer line for each of the transfer points providing fluid communication from the fluid distributor to the transfer point;
- (b) a feed conduit providing fluid communication of the feed stream to the simulated moving bed adsorptive separation zone feed inlet;
- (c) a first desorbent conduit providing fluid communication of a first desorbent component to the simulated moving bed adsorptive separation zone desorbent inlet;
- (d) a first extract distillation zone comprising an extract distillation column;
- (e) a first extract conduit providing fluid communication from the simulated moving bed adsorptive separation zone extract outlet to the first extract distillation zone;
- (f) a raffinate distillation zone comprising a raffinate distillation column;
- (g) a first raffinate conduit providing fluid communication from the simulated moving bed adsorptive separation zone to the raffinate distillation zone;
- (h) a fixed bed adsorptive separation zone for separating C9 aromatic hydrocarbons from the first desorbent component comprising a second adsorbent chamber containing a second adsorbent;
- (i) a C9 aromatic hydrocarbon conduit providing fluid communication of a second feed stream comprising the C9 aromatic hydrocarbons and the first desorbent component from the raffinate distillation zone to the fixed bed adsorptive separation zone;
- (j) a recycle conduit providing fluid communication of the first desorbent component from at least one of the first extract distillation zone and the raffinate distillation zone to the simulated moving bed adsorptive separation zone desorbent inlet;
- and
- (k) a second desorbent component conduit providing fluid communication of a second desorbent component to the fixed bed adsorptive separation zone.
Dependencies are inferred from the claim text.