711results about "Preparation by hydrocarbon ammoxidation" patented technology

A fluidized-bed catalyst for the ammoxidation reaction of olefin is composed of the carrier consisting of nano-SiO2 and silica sol, and the active component Mo(12-g)BiaFebNicXdZfOgOx, where X is chosen from Mg, Co, Ca, Be, Cu, Zn, Pb, Sb, Mn and Cr, Y is chosen from La, Ce and Sm, Z is chosen from Li, K, Rb, Na and Cs, Q is chosen from B, W, P and V, a=0.1-6, b=0.01-10, c=0.01-10, d=0.01-10, e=0.01-10, g=0-2 and f is more than (0-0.5).

Reactor membranes for used in oxidation reactions of hydrocarbons involving oxygen comprising a selective oxidation catalyst on a mixed conducting, oxide ion selective ceramic membrane of the composition (Sr1-xCax)1-yAyMn1-zBzO3-delta, whereA is Ba, Pb, Na, K, Y, an element of the lanthanide group or a combination thereof,B is Mg, Al, Ga, In, Sn, an element of the 3d or 4d period or a combination thereof,x is from 0.2 to 0.8,y is from 0 to 0.4,z is from 0 to 0.6, anddelta is a number, dependent on x, y and z, that renders the composition charge neutral.

This invention relates to a process for converting a hydrocarbon reactant to a product comprising an oxygenate or a nitrile, the process comprising: (A) flowing a reactant composition comprising the hydrocarbon reactant, and oxygen or a source of oxygen, and optionally ammonia, through a microchannel reactor in contact with a catalyst to convert the hydrocarbon reactant to the product, the hydrocarbon reactant undergoing an exothermic reaction in the microchannel reactor; (B) transferring heat from the microchannel reactor to a heat exchanger during step (A); and (C) quenching the product from step (A).

Process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation at a temperature in the range of from 380 to 500 DEG C. in a fluidized-bed reactor containing a catalyst composition preheated to a temperature of not lower than 300 DEG C. and lower than the ammoxidation reaction temperature, the catalyst composition comprising a carrier having supported thereon an oxide catalyst comprising a compound oxide of molybdenum, vanadium, niobium and at least one element selected from tellurium and antimony, wherein the ammoxidation of propane or isobutane is preceded by a specific temperature elevation operation in which the catalyst temperature in the reactor is elevated, while supplying into the fluidized-bed reactor a molecular oxygen-containing gas together with a combustible gas capable of combustion by reaction with the molecular oxygen in the presence of said catalyst composition, until the temperature of the catalyst composition reaches said ammoxidation reaction temperature. The process of the present invention is advantageous in that the temperature elevation of the catalyst can be performed without suffering a deterioration of the catalytic activity during the temperature elevation, thereby allowing the catalyst to fully exhibit its performance.

A fluidized-bed catalyst for preparing acrylonitrile by ammoxidizing propene is composed of SiO2 as carrier and the composition AaBbCcNidFeeBifM012Ox, where A is chosen from Li, Na, K, Rb and Cs, B is chosen from W, P, B, Ga, Cr, Sb, Al, Ge, Nb and V, and C is chosen from Ag, Cu and their mixture. Its advantages are high power to bear high reaction pressure and propene load, and high conversion rate and output rate.

Disclosed is an oxide catalyst for use in catalytic oxidation or ammoxidation of propane or isobutane in the gaseous phase, which comprises a composition represented by the Mo₁V_aSb_bNb_cZ_dO_n (wherein: Z is at least one element selected from the group consisting of tungsten, chromium, titanium, aluminum, tantalum, zirconium, hafnium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, zinc, boron, indium, germanium, tin, lead, bismuth, yttrium, gallium, rare earth elements and alkaline earth metals: and a, b, c, d, and n are, respectively, the atomic ratios of V, Sb, Nb, Z and O, relative to Mo), wherein 0.1≦a<0.4, 0.1<b≦0.4, 0.01≦c≦0.3, 0≦d≦1, with the proviso that a<b, and n is a number determined by and consistent with the valence requirements of the other elements present. Also disclosed is a process for producing an unsaturated carboxylic acid or an unsaturated nitrile by using the above-mentioned oxide catalyst.

A catalyst composition for the oxidation and ammoxidation of hydrocarbons comprising a plurality of silica sol particles with different average particle sizes, and a complex of metal catalytic oxides having the formula:

A_aB_bC_cBi_dMO_eO_x, wherein   (i)

A is one or more of Li, Na, K, Cs, Rb, In, and TI B is one or more of Ni, Mn, Co, Mg, Ca, and Zn C is one or more of Fe, Cr, Ce, Cu, V, W, Sb, Sn, Ge, P, B, Ga, Te, Nb, and Ta, a is 0.0-1.0 b is 0.0-12.0 c is 1.0-12.0 d is 0.0-2.0 e is 12.0-14.0; or

A_aB_bSb₁₂O_x, wherein   (ii)

A is one or more of Fe, Cr, Ce, V, U, Sn, Ti, Ga, and Nb B is one or more of Mo, W, Co, Cu, Te, Bi, Ni, Ca, and Ta a is 0.1-16 b is 0.0-12.0. In both (i) and (ii), the value of x depends on the oxidation state of the metals used. Furthermore, a process for producing said ammoxidation catalyst is disclosed.

A catalyst comprising a complex of catalytic oxides comprising potassium, cesium, cerium, chromium, cobalt, nickel, iron, bismuth, molybdenum, wherein the relative ratios of these elements is represented by the following general formula AaKbCscCedCreCofNigXhFeiBijMo12Ox wherein A is Rb, Na, Li, Tl, or mixtures thereof, X is P, Sb, Te, B, Ge, W, Ca, Mg, a rare earth element, or mixtures thereof, a is about 0 to about 1, b is about 0.01 to about 1, c is about 0.01 to about 1, d is about 0.01 to about 3, e is about 0.01 to about 2, f is about 0.01 to about 10, g is about 0.1 to about 10, h is about 0 to about 4, i is about 0.1 to about 4, j is about 0.05 to about 4, x is a number determined by the valence requirements of the other elements present, and wherein the catalyst is substantially free of manganese and zinc. The catalyst is useful in processes for the ammoxidation of an olefin selected from the group consisting of propylene, isobutylene or mixtures thereof, to acrylonitrile, methacrylonitrile and mixtures thereof, respectively.

A catalytic composition useful for the conversion of an olefin selected from the group consisting of propylene, isobutylene or mixtures thereof, to acrylonitrile, methacrylonitrile, and mixtures thereof. The catalytic composition comprising a complex of metal oxides comprising bismuth, molybdenum, iron, cerium and other promoter elements, wherein the X-ray diffraction pattern of the catalytic composition has X-ray diffraction peaks at 2θ angle 28±0.3 degrees and 2θ angle 26.5±0.3 degrees, and wherein the ratio of the intensity of the most intense x-ray diffraction peak within 2θ angle 28±0.3 degrees to the intensity of most intense x-ray diffraction peak within 2θ angle 26.5±0.3 degrees is defined as X/Y, and wherein X/Y is greater than or equal to 0.7.

Vanadium-containing catalysts are obtained by using polyvanadic acid as a source of vanadium. Vanadium-containing catalysts are obtained by mixing catalyst components other than vanadium, or their precursors, with a polyvanadic acid sol which is formed by ion-exchanging a metavanadic acid aqueous solution with a proton-type cation-exchange resin and performing polycondensation, and by drying and/or calcining the mixture. Such vanadium-containing catalysts can fully exhibit their catalytic activity under mild reaction conditions, and can be suitably used for various reactions, such as synthesis of phthalic anhydride by the partial oxidation of o-xylene, synthesis of benzaldehyde by the partial oxidation of toluene, synthesis of benzoic acid by the partial oxidation of toluene, synthesis of anisaldehyde by the partial oxidation of p-methoxy toluene, synthesis of propylene by the oxidative dehydrogenation of propane, synthesis of isobutene by the oxidative dehydrogenation of isobutane, synthesis of methyl formate by the oxidative dehydrogenation of methanol, and synthesis of acrylonitrile by the ammoxidation of propane.

The invention relates a preparation method of terephthalonitrile through ammonium oxidation, and aims to solve the problems of low yield of terephthalonitrile, small reaction load, or difficult reaction heat dissipation in the presence of a conventional catalyst in the prior art. A fluidized bed catalyst is used to solve the problems mentioned above, wherein the fluidized bed catalyst comprises 30 to 80% of silica carrier and 20 to 70% of active component, and the active component is represented by a formula V<1.0>CrPX<c>Y<d>Z<e>O<m>; wherein the X is selected from at least one component of boron oxides and arsenic oxides, Y is selected from at least one component of alkali metal oxides and alkali earth metal oxides, Z is selected from at least one component of oxides of Ni, Co, Pb, Fe, Mo, and W. The fluidized bed catalyst well solves the problems mentioned above and is capable of being applied to the industrial terephthalonitrile production.