US 6,642,426 B1 · Fluid-bed aromatics alkylation with staged injection of alkylating agents

Abstract

A system and process for producing xylene and other alkylated aromatics includes one or more fluidized bed reaction zones that provide contact between the reactants (i.e., an aromatic reactant and an alkylating reagent). Improved conversion and selectivity is realized when the alkylating reagent is stagewise injected into the fluidized bed at one or more locations downstream from the location of aromatic reactant introduction into the fluidized bed. Preferably, the alkylating reagent is introduced at a plurality of locations along the axial direction of the fluidized bed reaction zone, or at plural locations between a plurality of different fluidized bed reaction zones.

Claims17

Dependent claims

A process for alkylating an aromatic hydrocarbon reactant with an alkylating reagent comprising methanol to produce an alkylated aromatic product, comprising:

introducing the aromatic hydrocarbon reactant into a reactor system at a first location, wherein the reactor system includes a fluidized bed reaction zone comprising a temperature of 500° to 700° C. and an operating bed density of about 300 to 600 kg/m3, for producing the alkylated aromatic product;
introducing a plurality of streams of said alkylating reactant directly into said fluidized bed reaction zone at positions spaced apart in the direction of flow of the aromatic hydrocarbon reactant, at least one of said streams being introduced at a second location downstream from the first location;
and
recovering the alkylate aromatic product, produced by reaction of the aromatic reactant and the alkylating reagent, from the reactor system.

1 more element

Dependencies are inferred from the claim text.

Fluid-bed aromatics alkylation with staged injection of alkylating agents

Life of this patent

Fluid-bed aromatics alkylation with staged injection of alkylating agents

Life of this patent

Abstract

Claims17