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US 7,309,383 B2Granted
Process for removing solid particles from a gas-solids flow
AssigneeExxonMobil Chemical Patents Inc.
InventorsJames H. Beech, Jr., James R. Lattner, Nicolas P. Coute, Jeff S. Smith
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Abstract
Catalyst losses are prevented in riser reactor systems by using a low inlet velocity for the first cyclone separator in each multi-stage cyclone separator in the reactor. Catalyst particles not separated from the product output flow in an oxygenate-to-olefin reactor are also recaptured by cooling the product output flow and passing the flow through an electrostatic precipitator.
Claims8
A process for removing catalyst solids from a gas-solids flow in a methanol to olefin reactor, comprising:
- a) passing a feedstock through a fluidized bed of solid catalyst particles to form an olefin product flow containing solid catalyst particles;
- b) separating the olefin product flow into at least two flows, wherein one of the flows has a lower density than at least one other flow;
- c) cooling the lower density flow to a temperature between about 250° F. and about 800° F.;
- d) flowing the lower density flow through a precipitator or filter to thereby remove solid catalyst particles from said lower density flow without condensing liquid in said precipitator or filter;
- and
- e) quenching the lower density flow to cause water to condense out of the flow.
3 more elements
Dependencies are inferred from the claim text.