Patents by Inventor Isao Teshigahara
Isao Teshigahara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7632777Abstract: A composite oxide catalyst for the oxidation of an olefin containing Mo and Bi as essential components, characterized in that it has a specific surface area of 5 to 25 m2/g and a pore volume of 0.2 to 0.7 cc/g, and has a pore diameter distribution wherein the volume of the pores having a pore diameter of 0.03 to 0.1 ?m accounts for 30% or more of the total pore volume, the volume of the pores having a pore diameter of 0.1 to 1 ?m accounts for 20% or more of the total pore volume, and the volume of the pores having a pore diameter of less than 0.Type: GrantFiled: November 8, 2002Date of Patent: December 15, 2009Assignee: Mitsubishi Chemical CorporationInventors: Isao Teshigahara, Nariyasu Kanuka, Tomoatsu Iwakura
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Patent number: 7579501Abstract: A composite oxide catalyst for the oxidation of an olefin containing Mo and Bi as essential components, characterized in that it has a specific surface area of 5 to 25 m2/g and a pore volume of 0.2 to 0.7 cc/g, and has a pore diameter distribution wherein the volume of the pores having a pore diameter of 0.03 to 0.1 ?m accounts for 30% or more of the total pore volume, the volume of the pores having a pore diameter of 0.1 to 1 ?m accounts for 20% or more of the total pore volume, and the volume of the pores having a pore diameter of less than 0.Type: GrantFiled: December 5, 2007Date of Patent: August 25, 2009Assignee: Mitsubishi Chemical CorporationInventors: Isao Teshigahara, Nariyasu Kanuka, Tomoatsu Iwakura
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Publication number: 20090088316Abstract: An object is to efficiently separate catalyst grains from substantially inert grains and, optionally, separate a plurality of catalyst grains from one another, to thereby efficiently perform catalyst regeneration. After taking a catalyst-containing component containing a solid catalyst component deteriorated in a reaction, out of a fixed-bed reactor, the solid catalyst component is regenerated. If a plurality of components having different shapes from one another are contained as the solid catalyst components, after taking-out step, catalyst component separation step for separating such solid catalyst components from one another is performed and, then, the solid catalyst components are regenerated. Further, if an inert component is contained as the catalyst-containing component, after the taking-out step, an inert component separation step for separating the inert component is performed and then the solid catalyst component is regenerated.Type: ApplicationFiled: December 1, 2008Publication date: April 2, 2009Inventors: Hiroya Nakamura, Kazuharu Tazawa, Isao Teshigahara
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Publication number: 20080286186Abstract: A composite oxide catalyst for the oxidation of an olefin containing Mo and Bi as essential components, characterized in that it has a specific surface area of 5 to 25 m2/g and a pore volume of 0.2 to 0.7 cc/g, and has a pore diameter distribution wherein the volume of the pores having a pore diameter of 0.03 to 0.1 ?m accounts for 30% or more of the total pore volume, the volume of the pores having a pore diameter of 0.1 to 1 ?m accounts for 20% or more of the total pore volume, and the volume of the pores having a pore diameter of less than 0.Type: ApplicationFiled: December 5, 2007Publication date: November 20, 2008Inventors: Isao Teshigahara, Nariyasu Kanuka, Tomoatsu Iwakura
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Publication number: 20080119667Abstract: A composite oxide catalyst for the oxidation of an olefin containing Mo and Bi as essential components, characterized in that it has a specific surface area of 5 to 25 m2/g and a pore volume of 0.2 to 0.7 cc/g, and has a pore diameter distribution wherein the volume of the pores having a pore diameter of 0.03 to 0.1 ?m accounts for 30% or more of the total pore volume, the volume of the pores having a pore diameter of 0.1 to 1 ?m accounts for 20% or more of the total pore volume, and the volume of the pores having a pore diameter of less than 0.Type: ApplicationFiled: December 5, 2007Publication date: May 22, 2008Inventors: Isao Teshigahara, Nariyasu Kanuka, Tomoatsu Iwakura
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Publication number: 20080107583Abstract: A composite oxide catalyst for the oxidation of an olefin containing Mo and Bi as essential components, characterized in that it has a specific surface area of 5 to 25 m2/g and a pore volume of 0.2 to 0.7 cc/g, and has a pore diameter distribution wherein the volume of the pores having a pore diameter of 0.03 to 0.1 ?m accounts for 30% or more of the total pore volume, the volume of the pores having a pore diameter of 0.1 to 1 ?m accounts for 20% or more of the total pore volume, and the volume of the pores having a pore diameter of less than 0.Type: ApplicationFiled: December 5, 2007Publication date: May 8, 2008Inventors: Isao Teshigahara, Nariyasu Kanuka, Tomoatsu Iwakura
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Patent number: 7279442Abstract: A process for producing a catalyst which has a high mechanical strength and is capable of producing an unsaturated aldehyde and an unsaturated carboxylic acid constantly over a long period of time and in good yield; and, a method for producing an unsaturated aldehyde or carboxylic acid from catalytic oxidation of an olefin, a tertiary butyl alcohol, or a methyl tertiary butyl ether substrate with a gas that contains molecular oxygen and the produced catalyst.Type: GrantFiled: January 12, 2005Date of Patent: October 9, 2007Assignee: Mitsubishi Chemical CorporationInventors: Isao Teshigahara, Nariyasu Kanuka, Kazuharu Tazawa
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Patent number: 7262148Abstract: A catalyst for producing from an olefin the corresponding unsaturated aldehyde and unsaturated carboxylic acid in good yield, and a process for its production, are presented. It is a composite oxide catalyst containing at least molybdenum, bismuth and iron, to be used at the time of gas phase catalytic oxidation of an olefin with a molecular oxygen-containing gas to produce the corresponding unsaturated aldehyde and unsaturated carboxylic acid, wherein the loss on drying of the contained moisture, as represented by the following formula (1) (wherein W1 represents the weight when the catalyst is heated for two hours at 110±5° C., and W2 represents the weight of the catalyst prior to such heating), is at most 0.5 wt %: Loss on drying=(W2?W1)/W2×100.Type: GrantFiled: January 12, 2005Date of Patent: August 28, 2007Assignee: Mitsubishi Chemical CorporationInventors: Isao Teshigahara, Nariyasu Kanuka
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Patent number: 7217680Abstract: A method for producing a composite oxide catalyst for gas phase catalytic oxidation of an unsaturated aldehyde with a molecular oxygen-containing gas to produce the corresponding unsaturated carboxylic acid in good yield, is presented. A method for producing a composite oxide catalyst, which is a method for producing a composite oxide catalyst having the following formula (I), characterized in that Sb2O3 of isometric system is used as at least a part of an antimony-supplying source compound: Mo12XaVbSbcCudSieCfOg ??(I) (wherein the respective components and variables have the following meanings: X is at least one element selected from the group consisting of Nb and W; a, b, c, d, e, f and g represent atomic ratios of the respective elements, and against 12 of molybdenum atom, 0<a?10, 0<b?10, 0<c?5, 0<d?5, 0?e?1,000, and 0?f?1,000, and g is a number determined by the degrees of oxidation of the above respective components.Type: GrantFiled: January 11, 2005Date of Patent: May 15, 2007Assignee: Mitsubishi Chemical CorporationInventors: Isao Teshigahara, Hisao Kinoshita
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Patent number: 7147011Abstract: A method for packing a solid catalyst is provided, whereby the pressure loss of a reaction tube packed with the catalyst can be reduced. The method is characterized in that prior to packing a solid catalyst in a reactor, the solid catalyst is sieved to remove a cracked catalyst. For example, sieving is carried out against a solid catalyst of a columnar or cylindrical shape having an outer diameter A being larger than the length B in the axial direction by using a sieve having a sieve mesh with a width C satisfying the condition of A>C>B and a length being at least the width, or against a solid catalyst of a columnar or cylindrical shape with an outer diameter A being from 1 to 0.5 time the length B in the axial direction by using a sieve having a sieve mesh with a width C satisfying the condition of A>C>0.5B and a length being at least the width.Type: GrantFiled: January 31, 2005Date of Patent: December 12, 2006Assignee: Mitsubishi Chemical CorporationInventors: Kazuharu Tazawa, Isao Teshigahara, Teruo Saito
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Patent number: 7132384Abstract: A process for producing a composite oxide catalyst to be used for gas phase oxidation of an olefin or unsaturated aldehyde with molecular oxygen to produce the corresponding unsaturated aldehyde and/or unsaturated carboxylic acid, which has a uniform constant high performance, in an industrial scale and efficiently and constantly, is presented. The process comprises a step of molding a catalyst component-containing powder and a step of calcining a molded product obtained in the molding step, wherein the molding step is a step wherein graphite particles having an average particle diameter D50 of from 10 to 50 ?m and having a combustion initiating temperature in a differential thermogravimetric analysis higher by at least 50° C. than the calcination temperature in the next calcination step, are added to the catalyst component-containing powder in an amount of from 0.Type: GrantFiled: January 28, 2005Date of Patent: November 7, 2006Assignee: Mitsubishi Chemical CorporationInventors: Isao Teshigahara, Nariyasu Kanuka
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Publication number: 20060135346Abstract: An object is to efficiently separate catalyst grains from substantially inert grains and, optionally, separate a plurality of catalyst grains from one another, to thereby efficiently perform catalyst regeneration. After taking a catalyst-containing component containing a solid catalyst component deteriorated in a reaction, out of a fixed-bed reactor, the solid catalyst component is regenerated. If a plurality of components having different shapes from one another are contained as the solid catalyst components, after taking-out step, catalyst component separation step for separating such solid catalyst components from one another is performed and, then, the solid catalyst components are regenerated. Further, if an inert component is contained as the catalyst-containing component, after the taking-out step, an inert component separation step for separating the inert component is performed and then the solid catalyst component is regenerated.Type: ApplicationFiled: August 20, 2004Publication date: June 22, 2006Inventors: Hiroya Nakamura, Kazuharu Tazawa, Isao Teshigahara
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Publication number: 20050261521Abstract: A method for producing a composite oxide catalyst for gas phase catalytic oxidation of an unsaturated aldehyde with a molecular oxygen-containing gas to produce the corresponding unsaturated carboxylic acid in good yield, is presented. A method for producing a composite oxide catalyst, which is a method for producing a composite oxide catalyst having the following formula (I), characterized in that Sb2O3 of isometric system is used as at least a part of an antimony-supplying source compound: Mo12XaVbSbcCudSieCfOg ??(I) (wherein the respective components and variables have the following meanings: X is at least one element selected from the group consisting of Nb and W; a, b, c, d, e, f and g represent atomic ratios of the respective elements, and against 12 of molybdenum atom, 0<a?10, 0<b?10, 0<c?5, 0<d?5, 0?e?1,000 and 0?f?1,000, and g is a number determined by the degrees of oxidation of the above respective components.Type: ApplicationFiled: January 11, 2005Publication date: November 24, 2005Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Isao Teshigahara, Hisao Kinoshita
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Publication number: 20050261520Abstract: A new process for producing a catalyst which has a high mechanical strength and which is capable of producing an unsaturated carboxylic acid constantly over a long period of time and in good yield, is presented. A process for producing a catalyst for the production of an unsaturated carboxylic acid, which is a process for producing a catalyst containing at least molybdenum and vanadium, to be used at the time of gas phase catalytic oxidation of an unsaturated aldehyde with a molecular oxygen-containing gas to produce the unsaturated carboxylic acid, characterized in that a mixed solution or aqueous slurry containing the above catalyst components, is dried, the moisture content of the obtained dried product is adjusted to be from 0.5 to 4 wt %, and the powder thus adjusted is subjected to tabletting to obtain a molded product.Type: ApplicationFiled: January 11, 2005Publication date: November 24, 2005Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Isao Teshigahara, Kazuharu Tazawa
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Publication number: 20050165253Abstract: A new process for producing a catalyst which has a high mechanical strength and which is capable of producing an unsaturated aldehyde and an unsaturated carboxylic acid constantly over a long period of time and in good yield, is presented. A process for producing a catalyst for the production of an unsaturated aldehyde and an unsaturated carboxylic acid, which is a process for producing a catalyst containing at least molybdenum, bismuth and iron, to be used at the time of gas phase catalytic oxidation of an olefin, tertiary butyl alcohol or methyl tertiary butyl ether with a molecular oxygen-containing gas to produce the respectively corresponding unsaturated aldehyde and unsaturated carboxylic acid, characterized in that a mixed solution or aqueous slurry containing the above catalyst components, is dried, the moisture content of the obtained dried product is adjusted to be from 0.3 to 4 wt %, followed by tabletting.Type: ApplicationFiled: January 12, 2005Publication date: July 28, 2005Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Isao Teshigahara, Nariyasu Kanuka, Kazuharu Tazawa
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Publication number: 20050161373Abstract: A method for packing a solid catalyst is provided, whereby the pressure loss of a reaction tube packed with the catalyst can be reduced. The method is characterized in that prior to packing a solid catalyst in a reactor, the solid catalyst is sieved to remove a cracked catalyst. For example, sieving is carried out against a solid catalyst of a columnar or cylindrical shape having an outer diameter A being larger than the length B in the axial direction by using a sieve having a sieve mesh with a width C satisfying the condition of A>C>B and a length being at least the width, or against a solid catalyst of a columnar or cylindrical shape with an outer diameter A being from 1 to 0.5 time the length B in the axial direction by using a sieve having a sieve mesh with a width C satisfying the condition of A>C>0.5B and a length being at least the width.Type: ApplicationFiled: January 31, 2005Publication date: July 28, 2005Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Kazuharu Tazawa, Isao Teshigahara, Teruo Saito
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Publication number: 20050159620Abstract: A catalyst for producing from an olefin the corresponding unsaturated aldehyde and unsaturated carboxylic acid in good yield, and a process for its production, are presented. It is a composite oxide catalyst containing at least molybdenum, bismuth and iron, to be used at the time of gas phase catalytic oxidation of an olefin with a molecular oxygen-containing gas to produce the corresponding unsaturated aldehyde and unsaturated carboxylic acid, wherein the loss on drying of the contained moisture, as represented by the following formula (1) (wherein W1 represents the weight when the catalyst is heated for two hours at 110±5° C., and W2 represents the weight of the catalyst prior to such heating), is at most 0.Type: ApplicationFiled: January 12, 2005Publication date: July 21, 2005Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Isao Teshigahara, Nariyasu Kanuka
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Publication number: 20050131253Abstract: A process for producing a composite oxide catalyst to be used for gas phase oxidation of an olefin or unsaturated aldehyde with molecular oxygen to produce the corresponding unsaturated aldehyde and/or unsaturated carboxylic acid, which has a uniform constant high performance, in an industrial scale and efficiently and constantly, is presented. The process comprises a step of molding a catalyst component-containing powder and a step of calcining a molded product obtained in the molding step, wherein the molding step is a step wherein graphite particles having an average particle diameter D50 of from 10 to 50 ?m and having a combustion initiating temperature in a differential thermogravimetric analysis higher by at least 50° C. than the calcination temperature in the next calcination step, are added to the catalyst component-containing powder in an amount of from 0.Type: ApplicationFiled: January 28, 2005Publication date: June 16, 2005Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Isao Teshigahara, Nariyasu Kanuka
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Publication number: 20050033093Abstract: A composite oxide catalyst for the oxidation of an olefin containing Mo and Bi as essential components, characterized in that it has a specific surface area of 5 to 25 m2/g and a pore volume of 0.2 to 0.7 cc/g, and has a pore diameter distribution wherein the volume of the pores having a pore diameter of 0.03 to 0.1 ?m accounts for 30% or more of the total pore volume, the volume of the pores having a pore diameter of 0.1 to 1 ?m accounts for 20% or more of the total pore volume, and the volume of the pores having a pore diameter of less than 0.Type: ApplicationFiled: November 8, 2002Publication date: February 10, 2005Inventors: Isao Teshigahara, Nariyasu Kanuka, Tomoatsu Iwakura