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US 8,273,934 B2Granted
Process for producing para-xylene
AssigneeExxonMobil Chemical Patents Inc.
InventorsJohn Di-Yi Ou, John R. Porter
Life of this patent
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Abstract
A process for producing a PX-rich product, the process comprising: (a) providing a PX-depleted stream; (b) isomerizing at least a portion of the PX-depleted stream to produce an isomerized stream having a PX concentration greater than the PX-depleted stream and a benzene concentration of less than 1,000 ppm and a C9+ hydrocarbons concentration of less than 5,000 ppm; and (c) separating the isomerized stream by selective adsorption.
Claims13
A process for producing a PX-rich product, the process comprising:
- (a) separating a feedstock containing C8 hydrocarbons to produce a C8 hydrocarbons rich stream;
- (b) separating a first portion of the C8 hydrocarbons rich stream to produce a first PX-rich stream and a first raffinate stream;
- (c) isomerizing at least a portion of the first raffinate stream to produce a first isomerized stream having a higher PX concentration than the first raffinate stream;
- (d) separating a second portion of the C8 hydrocarbons rich stream to produce a second PX-rich stream and a second raffinate stream;
- (e) isomerizing, at least partially in the liquid phase, at least a portion of the second raffinate stream to produce a second isomerized stream having a higher PX concentration than the second raffinate stream, where the second isomerized stream has a benzene concentration of less than 300 ppm and a C9+ hydrocarbons concentration of less than 2,000 ppm;
- (f) recovering at least a portion of at least one of the first and second PX-rich streams as PX-rich product by selective adsorption;
- and
- (g) providing at least a portion of the first isomerized stream and at least a portion of the second isomerized stream to the separating (a).
5 more elements
Dependencies are inferred from the claim text.