US 6,281,384 B1 · Vapor phase catalytic oxidation of propylene to acrylic acid

Abstract

An improved method for manufacturing acrylic acid by vapor phase oxidation of propylene in a single step or reaction stage using as solid phase oxidant a mixture of two particulate solids comprising a bismuth molybdate multimetal oxide (e.g., Mo12Co3.5Bi1.1Fe0.8W0.5Si1.4K0.05Ox) and a molybdenum vanadate multimetal oxide (e.g., Mo12V4.8Sr0.5W2.4Cu2.2Ox). Such a process is advantageously carried out in a recirculating solids reactor system wherein the particulate mixture of solids in an oxidized state reacts with a feed gas containing propylene in a vertical riser reactor and after separation from the acrylic acid gaseous product the particulate mixture of solids in a reduced state is regenerated by contact with an oxygen containing gas in a separate regeneration reactor before recirculation to the riser for further reaction.

Claims8

Dependent claims

A process for the oxidation of propylene to acrylic acid comprising the steps of:

(a) contacting a feed gas comprising (i) from 1 to 100 mol % propylene, (ii) from 0 to 20 mol % oxygen, (iii) from 0 to 70 mol % water, and (vi) the remainder inert gas with an effective amount of an oxidant mixture comprising a particulate molybdenum vanadate multimetal oxide in an oxidized state and a bismuth molybdate multimetal oxide in an oxidized state at a temperature from 250 to 450° C. and for a time sufficient to convert a portion of said propylene to acrylic acid, wherein the relative amount of said molybdenum vanadate multimetal oxide is from 5 to 50 percent by weight total active ingredients and the remainder 95 to 50 percent by weight is said bismuth molybdate multimetal oxide;
and
(b) recovering said acrylic acid produced in step (a).

Dependencies are inferred from the claim text.

Vapor phase catalytic oxidation of propylene to acrylic acid

Life of this patent

Vapor phase catalytic oxidation of propylene to acrylic acid

Life of this patent

Abstract

Claims8