摘要:
Isobutyric acid or a lower alkyl ester thereof is oxidatively dehydrogenated in the vapor phase producing the corresponding .alpha.,.beta.-olefinically unsaturated derivative by contact with a heterogeneous catalyst in the presence of molecular oxygen. The catalyst is composed of the calcined mixture of salts of titanium and iron.
摘要:
Isobutyric acid or a lower alkyl ester thereof is oxidatively dehydrogenated in the vapor phase to produce the corresponding alpha, beta-olefinically unsaturated derivative by contact with a heterogeneous catalyst in the presence of oxygen. The catalyst has the empirical formula Fe.sup.II Fe.sub.2.sup.III (PO.sub.4).sub.2.(OH).sub.2 which can exist in the form of Barbosalite and/or Lipscombite.
摘要:
Isobutyric acid or a lower alkyl ester thereof is oxidatively dehydrogenated in the vapor phase producing the corresponding .alpha.,.beta.-olefinically unsaturated derivative by contact with a heterogeneous catalyst in the presence of molecular oxygen. The catalyst is composed of the calcined oxides of uranium and tungsten.
摘要:
The catalyst comprises one or more molybdates of trivalent metals chosen from Fe, Al, Ce and Cr and/or molybdates of bivalent metals chosen from alpha manganese molybdate, beta cobalt molybdate, beta nickel molybdate and the molybdates of Zn, Mg and Ca, and one or more promoter elements chosen from Se, Te, As, Sb, V, Nb, Sn, Pb and Tl homogeneously distributed within the crystalline structure of said molybdates with distortion thereof without creating new crystalline phases.
摘要:
A method of regenerating an iron/phosphate-type catalyst typically used for the oxydehydrogenation of lower molecular weight carboncylic acids comprising the step of subjecting the catalyst to an oxidizing atmosphere, preferably by discontinuing the flow of organic feed through the catalyst bed, followed by the step of subjecting the catalyst to a reducing atmosphere, preferably injecting organic feed in the absence of oxygen over the catalyst. The method is specifically described with respect to the production of methacrylic acid by the oxydehydrogenation of isobutyric acid.
摘要:
Isobutyric acid or a functional equivalent, e.g., a lower alkyl ester is oxidatively dehydrogenated to effect the vapor phase conversion thereof to the corresponding .alpha.,.beta.-ethylenically unsaturated derivative by contact with a heterogeneous catalyst in the presence of molecular oxygen. The catalyst is composed of calcined phosphates of iron containing silver as a modifier or dopant component.
摘要:
A process for the direct oxidation of isobutane or propane to methacrylic acid or acrylic acid respectively is disclosed. The process encompasses contacting a feed gas containing isobutane or propane and oxygen with a specific catalyst which is composed of molybdenum, antimony and phosphorus combined with oxygen. The atomic ratio of molybdenum to antimony to phosphorous is from about 9 to about 24; about 0.25 to about 2; and about 0.75 to about 2 respectively. The catalytic oxidation to methacrylic or acrylic acid is accomplished at a temperature of from about 200.degree. C. to about 450.degree. C. The methacrylic or acrylic acid is removed from the feed gases exiting from the reaction zone and the remainder of the exited feed stream may be recycled to again contact the catalyst.
摘要:
A process for producing acrylic acid from propylene through acrolein as an intermediate by catalytic vapor phase oxidation, which comprises passing a starting reactant gas mixture containing propylene, a molecular oxygen-containing gas and steam through a first-stage reactor packed with a molybdenum-containing multi-component catalyst, passing the resulting acrolein-containing gas through a second-stage reactor packed with a multi-component catalyst containing vanadium and molybdenum, introducing the resulting acrylic acid-containing gas to an acrylic acid collector thereby to recover acrylic acid in the form of an aqueous solution, and incorporating a part of the exhaust gas from the collector in the starting reactant gas mixture.
摘要:
An olefin having 4 carbon atoms or t-butyl alcohol is catalytically oxidized in the gas phase with molecular oxygen at 200.degree. to 450.degree. C to give the corresponding unsaturated aldehyde, unsaturated carboxylic acid and/or conjugated diene in the presence of a catalyst having the formula:Mo.sub.a Sb.sub.b Bi.sub.c Fe.sub.d Ni.sub.e Co.sub.f Sn.sub.g X.sub.h Y.sub.i O.sub.jwherein a to j represent the atomic ratio of each component and a is 12, b is 0.2 to 20, c is 0.2 to 12, d is 0.2 to 12, e is 0.2 to 12, f is 0 to 20, g is 0 to 20, h is 0.01 to 4, i is 0.01 to 4 and j is a value determined by the valencies of the elements in the catalyst, and wherein X is at least one metal selected from the group consisting of potassium, rubidium, cesium and thallium, and Y is at least one metal selected from the group consisting of selenium, tellurium, gallium, vanadium, ruthenium, zinc, niobium, magnesium, chromium, manganese, cadmium and tantalum.
摘要:
An improved process for the production of acrolein from propylene and of acrylic acid from propylene or acrolein or mixtures of propylene and acrolein which essentially comprises catalytic oxidation of propylene and/or acrolein with oxygen or a gas containing molecular oxygen in the presence of an oxidation catalyst and of methanol in a quantity of from 0.01 to 1% by volume with respect to the total gaseous mixture of the reactants. Acrolein and acrylic acid are formed in the process at high conversion rates and selectivities.