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US 2019/0161420 A1Published application
Systems and Methods for Aromatic Alkylation
AssigneeExxonMobil Chemical Patents Inc.
InventorsTodd E. Detjen, John S. Kennedy, Catherine M. Dorsi
Life of this patent
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Abstract
Methods and related systems are disclosed for condensing a minor portion of an effluent stream from an alkylation reactor by contacting the effluent stream with a first liquid hydrocarbon quench stream and a second liquid hydrocarbon quench stream. The effluent stream includes catalyst fines from the reactor, and at least a portion of the catalyst fines are carried with the condensed minor portion of the effluent stream.
Claims20
A process, comprising:
- (a) reacting an aromatic feedstock comprising benzene with methanol under alkylation conditions in a reactor in the presence of a fluidized bed of solid catalyst particles to produce a vapor phase effluent comprising toluene, xylenes, water, unreacted benzene and solid catalyst fines;
- (b) contacting the vapor phase effluent with a first liquid phase hydrocarbon quench stream to produce a mixture having a higher dew point than the vapor phase effluent;
- (c) contacting the mixture with a second liquid phase hydrocarbon quench stream after (b) under conditions to condense a minor portion of the mixture and produce a condensate which contains at least some of the catalyst fines and which is substantially free of an aqueous phase;
- and
- (d) separating at least a portion of the condensate containing said fines from the remainder of the mixture.
2 more elements
A process, comprising:
- (a) reacting an aromatic feedstock comprising benzene with methanol under alkylation conditions in a reactor in the presence of a fluidized bed of solid catalyst particles to produce a vapor phase effluent comprising toluene, xylenes, water, unreacted benzene and solid catalyst fines;
- (b) flowing the vapor phase effluent to a quench vessel;
- (c) flowing a first liquid phase hydrocarbon quench stream to the quench vessel;
- (d) flowing a second liquid phase hydrocarbon quench stream to the quench vessel independently of the first liquid phase hydrocarbon quench stream;
- (e) contacting the vapor phase effluent with each of the first liquid phase quench stream and the second liquid phase hydrocarbon quench stream in the quench vessel under conditions to condense a minor portion of the vapor phase effluent and produce a condensate which contains at least some of the catalyst fines and which is substantially free of an aqueous phase;
- and
- (f) separating at least a portion of the condensate containing said fines from the remainder of the vapor phase effluent.
4 more elements
A system, comprising:
- a reactor;
- a quench vessel, wherein the reactor is coupled to the quench vessel such that an effluent containing catalyst fines emitted from the reactor is flowed to the quench vessel, wherein the quench vessel is configured to condense a minor portion of the effluent from the reactor and produce a condensate which contains at least some of the catalyst fines and which is substantially free of an aqueous phase;
- a product recovery section, wherein the product recovery section is configured to receive a portion of a condensate;
- a first recycle line coupling the product recovery section to the quench vessel, wherein the product recovery section is configured to emit a first liquid hydrocarbon quench stream and direct the first liquid hydrocarbon quench stream to the quench vessel via the recycle line;
- and
- a second recycle line extending from a first position on the quench vessel to a second position on the quench vessel, wherein the first position is lower than the second position, and wherein the second recycle line is configured to circulate a second liquid hydrocarbon quench stream within the quench vessel;
- wherein the first recycle line and the second recycle line are configured such that the first liquid hydrocarbon quench stream and the second liquid hydrocarbon quench stream are provided independently to the quench vessel.
4 more elements
Dependencies are inferred from the claim text.