Abstract: A method for producing a conjugated diolefin is configured as follows. A monoolefin having four or more carbon atoms is fed from a monoolefin feed nozzle(s) installed at n place(s) (n=1, 2, . . . , n). In addition, at least 50% or more of a total amount of an oxygen-containing gas is fed from an oxygen-containing gas feed nozzle located at a bottom of a fluidized bed reactor. Furthermore, the monoolefin feed nozzles at heights a1, a2, . . . , an from the oxygen-containing gas feed nozzle feed the monoolefin having four or more carbon atoms at ratios of b1, b2, . . . , bn (b1+b2+ . . . +bn=1), respectively, and a weighted mean value represented by the following formula and obtained from the above heights and the above ratios is 200 mm to 3000 mm. arithmetic mean value=a1*b1+a2*b2+ . . .

Abstract: A method for producing a conjugated diolefin is configured as follows. A monoolefin having four or more carbon atoms is fed from a monoolefin feed nozzle(s) installed at n place(s) (n=1, 2, . . . , n). In addition, at least 50% or more of a total amount of an oxygen-containing gas is fed from an oxygen-containing gas feed nozzle located at a bottom of a fluidized bed reactor. Furthermore, the monoolefin feed nozzles at distances a1, a2, . . . , an from the oxygen-containing gas feed nozzle feed the monoolefin having four or more carbon atoms at ratios of b1, b2, . . . , bn (b1+b2+ . . . +bn=1), respectively, and an arithmetic mean value represented by the following formula and obtained from the above distances and the above ratios is 100 mm or more. arithmetic mean value=a1*b1+a2*b2+ . . .

Abstract: A method for producing a conjugated diolefin is configured as follows. A monoolefin having four or more carbon atoms is fed from a plurality of monoolefin feed nozzles. In addition, at least 50% or more of a total amount of an oxygen-containing gas is fed from an oxygen-containing gas feed nozzle located at a bottom of a fluidized bed reactor. Furthermore, the plurality of monoolefin feed nozzles at n places located at heights a1, a2, . . . , and an from the oxygen-containing gas feed nozzle, respectively, feed the monoolefin having four or more carbon atoms at ratios of b1, b2, . . . , bn (b1+b2+ . . . +bn=1), respectively. Furthermore, a weighted mean value represented by the following formula is 100 mm or greater: weighted mean value=a1*b1+a2*b2+ . . . +an*bn.

Abstract: A process for producing butadiene from a monoolefin having 4 carbon atoms by a vapor-phase catalytic oxidation reaction in a fluidized bed reactor, including a first step of producing the butadiene by bringing the monoolefin having 4 carbon atoms into contact with a catalyst and a second step of removing a part of the catalyst from the fluidized bed reactor while the vapor-phase catalytic oxidation reaction is proceeding, regenerating the catalyst removed, and feeding the regenerated catalyst to the fluidized bed reactor while the vapor-phase catalytic oxidation reaction is proceeding, wherein a ratio of an amount (kg/hr) of the regenerated catalyst fed to an amount (kg/hr) of the monoolefin having 4 carbon atoms fed is 0.3% or more.

Abstract: The present invention provides a process for producing propylene, comprising contacting at least one of raw material selected from the group consisting of ethylene and ethanol with a catalyst containing a medium pore diameter zeolite in a fluidized bed reactor wherein the catalyst containing the medium pore diameter zeolite satisfies the following (a) through (e): (a) a particle diameter of catalyst particles at 90% by weight or more is within a range of 10 to 197 ?m; (b) a bulk density of the catalyst particles is within a range of 0.7 to 1.1 g/cm3; (c) a mean compressive strength of the catalyst particles having a particle diameter within a range of 30 to 70 ?m is 15 MPa or more, and a compressive strength of the catalyst particles at 90% by weight or more is 10 MPa or more; (d) an angle of repose is 20 to 30°; and (e) a pore volume of pores having a pore radius within a range of 2000 to 20000 nm is 0.050 cc/g or less.

Abstract: A method for producing a conjugated diolefin is configured as follows. A monoolefin having four or more carbon atoms is fed from a monoolefin feed nozzle(s) installed at n place(s) (n=1, 2, . . . , n). In addition, at least 50% or more of a total amount of an oxygen-containing gas is fed from an oxygen-containing gas feed nozzle located at a bottom of a fluidized bed reactor. Furthermore, the monoolefin feed nozzles at distances a1, a2, . . . , an from the oxygen-containing gas feed nozzle feed the monoolefin having four or more carbon atoms at ratios of b1, b2, . . . , bn (b1+b2+ . . . +bn=1), respectively, and an arithmetic mean value represented by the following formula and obtained from the above distances and the above ratios is 100 mm or more. arithmetic mean value=a1*b1+a2*b2+ . . .

Abstract: There is provided a method for production of a conjugated diene from a monoolefin having four or more carbon atoms by a fluidized bed reaction. The method for production of a conjugated diolefin includes bringing a catalyst in which an oxide is supported on a carrier into contact with a monoolefin having four or more carbon atoms in a fluidized bed reactor in which the catalyst and oxygen are present, wherein the method satisfies the following (1) to (3): (1) the catalyst contains Mo, Bi, and Fe; (2) a reaction temperature is in the range of 300 to 420° C.; and (3) an oxygen concentration in a reactor outlet gas is in the range of 0.05 to 3.0% by volume.

Abstract: There is provided a method for production of a conjugated diene from a monoolefin having four or more carbon atoms by a fluidized bed reaction. The method for production of a conjugated diolefin includes bringing a catalyst in which an oxide is supported on a carrier into contact with a monoolefin having four or more carbon atoms in a fluidized bed reactor in which the catalyst and oxygen are present, wherein the method satisfies the following (1) to (3): (1) the catalyst contains Mo, Bi, and Fe; (2) a reaction temperature is in the range of 300 to 420° C.; and (3) an oxygen concentration in a reactor outlet gas is in the range of 0.05 to 3.0% by volume.

Abstract: The present invention provides a process for producing propylene, comprising contacting at least one of raw material selected from the group consisting of ethylene and ethanol with a catalyst containing a medium pore diameter zeolite in a fluidized bed reactor wherein the catalyst containing the medium pore diameter zeolite satisfies the following (a) through (e): (a) a particle diameter of catalyst particles at 90% by weight or more is within a range of 10 to 197 ?m; (b) a bulk density of the catalyst particles is within a range of 0.7 to 1.1 g/cm3; (c) a mean compressive strength of the catalyst particles having a particle diameter within a range of 30 to 70 ?m is 15 MPa or more, and a compressive strength of the catalyst particles at 90% by weight or more is 10 MPa or more; (d) an angle of repose is 20 to 30°; and (e) a pore volume of pores having a pore radius within a range of 2000 to 20000 nm is 0.

Abstract: A particulate porous ammoxidation catalyst for use in producing acrylonitrile or methacrylonitrile by reacting propylene, isobutene or tert-butyl alcohol with molecular oxygen and ammonia in a fluidized-bed reactor, the catalyst comprising a metal oxide and a silica carrier having supported thereon the metal oxide, wherein the metal oxide contains at least two elements selected from the group consisting of molybdenum, bismuth, iron, vanadium, antimony, tellurium and niobium, and the catalyst having a particle diameter distribution wherein the amount of catalyst particles having a particle diameter of from 5 to 200 ?m is from 90 to 100% by weight, based on the weight of the catalyst, and having a pore distribution wherein the cumulative pore volume of pores having a pore diameter of 80 ? or less is not more than 20%, based on the total pore volume of the catalyst and wherein the cumulative pore volume of pores having a pore diameter of 1,000 ? or more is not more than 20%, based on the total pore volume of the

Abstract: A particulate porous ammoxidation catalyst for use in producing acrylonitrile or methacrylonitrile by reacting propylene, isobutene or tert-butyl alcohol with molecular oxygen and ammonia in a fluidized-bed reactor, the catalyst comprising a metal oxide and a silica carrier having supported thereon the metal oxide, wherein the metal oxide contains at least two elements selected from the group consisting of molybdenum, bismuth, iron, vanadium, antimony, tellurium and niobium, and the catalyst having a particle diameter distribution wherein the amount of catalyst particles having a particle diameter of from 5 to 200 ?m is from 90 to 100% by weight, based on the weight of the catalyst, and having a pore distribution wherein the cumulative pore volume of pores having a pore diameter of 80 ? or less is not more than 20%, based on the total pore volume of the catalyst and wherein the cumulative pore volume of pores having a pore diameter of 1,000 ? or more is not more than 20%, based on the total pore volume of the

Abstract: A process for producing acrylonitrile or methacrylonitrile, wherein a molybdenum compound, which is convertible to molybdenum oxide and not supported on a carrier is added to a fluidized bed reactor as an activator, in such a way that the ratio y of molybdenum atoms in the oxide catalyst represented by the formula:Mo.sub.y Bi.sub.p Fe.sub.q A.sub.a B.sub.b C.sub.c D.sub.d E.sub.e O.sub.fwill be maintained in the range of 1.02x to 1.12x (x=1.5p+q+a+c+1.5d+1.5e) during an ammoxydation reaction.

Abstract: Process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation at a temperature in the range of from 380 to 500.degree. C. in a fluidized-bed reactor containing a catalyst composition preheated to a temperature of not lower than 300.degree. C.

Abstract: The present invention is a process for producing an unsaturated nitrile such as acrylonitrile or methacrylonitrile by ammoxidation of an organic compound such as propylene, isobutene or tertiary butanol. The process comprises carrying out the ammoxidation such that the organic acid/unreacted ammonia ratio in an ammoxidation product gas is controlled to remain within the range from 0.8 to 3.0 inclusive in a reactor, introducing the ammoxidation product gas into a quench tower, and reacting in the tower the unreacted ammonia with the organic acid produced in a reactor, to fix the unreacted ammonia as an ammonium salt of the organic acid.

Abstract: Process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation at a temperature in the range of from 380 to 500.degree. C. in a fluidized-bed reactor containing a catalyst composition preheated to a temperature of not lower than 300.degree. C.

Abstract: Disclosed is an ammoxidation catalyst composition for use in producing acrylonitrile from propylene, or methacrylonitrile from isobutene or tert-butanol, by ammoxidation of the propylene or of the isobutene or tert-butanol, comprising an oxide catalyst composition represented by the formula:Mo.sub.12 (Bi.sub.1-a A.sub.a).sub.b Fe.sub.c Co.sub.d X.sub.e Y.sub.f O.sub.g,wherein A is at least one rare earth element, X is at least one element selected from the group consisting of nickel, magnesium, zinc and manganese, Y is at least one element selected from the group consisting of potassium, rubidium and cesium, a is a number of from 0.6 to 0.8, b is a number of from 0.5 to 2, c is a number of from 0.1 to 3, d is a number of from more than 0 to 10, e is a number of from 0 to 8, f is a number of from 0.01 to 2, and g is a number determined by the valence requirements of the other elements present.

Abstract: Disclosed is an ammoxidation catalyst composition for use in producing acrylonitrile from propylene, or methacrylonitrile from isobutene or tert-butanol, by ammoxidation of the propylene or of the isobutene or tert-butanol, comprising an oxide catalyst composition represented by the formula:Mo.sub.12 (Bi.sub.1-a A.sub.a).sub.b Fe.sub.c Ni.sub.d X.sub.e Y.sub.f O.sub.g,whereinA is at least one rare earth element,X is at least one element selected from magnesium and zinc,Y is at least one element selected from potassium, rubidium and cesium,a is a number of from 0.6 to 0.8,b is a number of from 0.5 to 2,c is a number of from 0.1 to 3,d is a number of from 4 to 10,e is a number of from 0 to 3,f is a number of from 0.01 to 2, andg is a number determined by the valence requirements of the other elements present.

Abstract: A process for purifying crude acetonitrile comprising: (1) a step of contacting crude acetonitrile with nascent oxygen, (2) a step of contacting the acetonitrile from step (1) with a solid base, and (3) a step of removing low-boiling compounds and high-boiling compounds from the acetonitrile from step (2), wherein the step (3) may be effected after the step (1) and before the step (2).