Process for production of unsaturated aldehyde and unsaturated carboxylic acid
AssigneeSumitomo Chemical Company, Limited
InventorsKoichi Nagai, Yoshisaburou Nomura, Yoshihiko Nagaoka
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Abstract
Disclosed are a process for producing an unsaturated aldehyde and an unsaturated carboxylic acid which comprises subjecting propylene, isobutylene or tertiary butanol to gas phase catalytic oxidation with molecular oxygen in the presence of (i) a catalyst comprising composite oxide of the formula Mo.sub.a Bi.sub.b Fe.sub.c A.sub.d B.sub.e C.sub.f D.sub.g O.sub.x and (ii) a molybdenum oxide which in itself is substantially inert to the gas phase catalytic oxidation; a process for reusing the catalyst deteriorated due to the gas phase catalytic oxidation after mixing it with the molybdenum oxide; and a method of regenerating the deteriorated catalyst by mixing it with the molybdenum oxide.
Claims29
A process for producing an unsaturated aldehyde and a carboxylic acid which comprises subjecting propylene, isobutylene or tertiary butanol to gas phase catalytic oxidation with molecular oxygen in the presence of (i) a catalyst comprising composite oxide represented by the formula
- Mo.sub.a Bi.sub.b Fe.sub.c A.sub.d B.sub.e C.sub.f D.sub.g O.sub.x
- wherein Mo, Bi, Fe and O represent molybdenum, bismuth, iron and oxygen, respectively;
- A represents nickel and/or cobalt;
- B represents at least one element selected from the group consisting of manganese, zinc, calcium, magnesium, tin and lead;
- C represents at least one element selected from the group consisting of phosphorus, boron, arsenic, tellurium, tungsten, antimony and silicon;
- D represents at least one element selected from the group consisting of potassium, rubidium, cesium and thallium;
- in case of a being 12, 0<b.ltoreq.10, 0<c.ltoreq.10, 1.ltoreq.d.ltoreq.10, 0.ltoreq.e.ltoreq.10, 0.ltoreq.f.ltoreq.20 and 0<g.ltoreq.2;
- and x has a value dependent on the oxidation state of the respective elements and (ii) a molybdenum oxide which in itself is substantially inert to said gas phase catalytic oxidation to provide the corresponding unsaturated aldehyde and unsaturated carboxylic acid.
A process for producing an unsaturated aldehyde end a carboxylic acid by subjecting propylene, isobutylene or tertiary butanol to gas phase catalytic oxidation with molecular oxygen in the presence of a catalyst comprising a composite oxide represented by the formula
- Mo.sub.a Bi.sub.b Fe.sub.c A.sub.d B.sub.e C.sub.f D.sub.g O.sub.x
- wherein Mo, Bi, Fe and represent molybdenum, bismuth, iron and oxygen, respectively;
- A represents at least one element selected from the group consisting of nickel and cobalt;
- B represents at least one element selected from the group consisting of manganese, zinc, calcium, magnesium, tin and lead;
- C represents at least one element selected from the group consisting of phosphorus, boron, arsenic, tellurium, tungsten, antimony and silicon;
- D represents at least one element selected from the group consisting of potassium, rubidium, cesium and thallium;
- when a is 12, 0<b<10, O<c.ltoreq.10, 1.ltoreq.d.ltoreq.10, 0.ltoreq.e.ltoreq.10, 0.ltoreq.f.ltoreq.20 and 0<g.ltoreq.2;
- and has a value dependent on the oxidation state of the respective elements, wherein the catalyst deteriorated due to said gas phase catalytic oxidation is reused after mixing it with a molybdenum oxide which in itself is substantially inert to said gas phase catalytic oxidation, and optionally calcining the resulting mixture at a temperature of from 400.degree. to 530.degree. C., wherein said gas phase catalytic oxidation reaction is conducted in a fixed-bed reactor.
A process for regenerating a catalyst consisting essentially of mixing (i) a catalyst comprising a composite oxide represented by the formula
- Mo.sub.a Bi.sub.b Fe.sub.c A.sub.d B.sub.e C.sub.f D.sub.g O.sub.x
- wherein Mo, Bi, Fe and O represent molybdenum, bismuth, iron and oxygen, respectively;
- A represents at least one element selected from the group consisting of nickel and cobalt;
- B represents at least one element selected from the group consisting of manganese, zinc, calcium, magnesium, tin and lead;
- C represents at least one element selected from the group consisting of phosphorus, boron, arsenic, tellurium, tungsten, antimony and silicon;
- D represents a least one element selected from the group consisting of potassium, rubidium, cesium and thallium;
- when a is 12, 0<b.ltoreq.10, 0<c.ltoreq.10, 1.ltoreq.d.ltoreq.10, 0.ltoreq.e.ltoreq.10, 0.ltoreq.f.ltoreq.20 and 0<g.ltoreq.2;
- and x has a value dependent on the oxidation state of the respective elements, wherein the catalyst has been used in and deteriorated due to a gas phase catalytic oxidation of propylene, isobutylene or tertiary butanol using molecular oxygen to provide a corresponding unsaturated aldehyde and unsaturated carboxylic acid, and (ii) a molybdenum oxide which in itself is substantially inert to said gas phase catalytic oxidation, and optionally calcining the resulting mixture of (i) and (ii) within a temperature range 400.degree. to 530.degree. C.
Dependencies are inferred from the claim text.