Patents by Inventor Kazuharu Tazawa
Kazuharu Tazawa 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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Publication number: 20230219070Abstract: A catalyst may suppress pressure loss and coaking and produce a target substance in high yield when a gas-phase catalytic oxidation reaction of a material substance is conducted using the catalyst to produce the target substance. A ring-shaped catalyst may have a straight body part and a hollow body part, which is used when a gas-phase catalytic oxidation reaction of a material substance is conducted to produce a target substance, wherein a length of the straight body part is shorter than a length of the hollow body part and at least at one end part, a region from an end part of the straight body part to an end part of the hollow body part is concavely curved.Type: ApplicationFiled: February 27, 2023Publication date: July 13, 2023Applicant: Mitsubishi Chemical CorporationInventors: Kazuharu TAZAWA, Takanori TANIGUCHI, Takuya NAKAMURA
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Patent number: 11628425Abstract: An object of the present invention is to provide a catalyst ensuring that when a gas-phase catalytic oxidation reaction of a material substance is conducted using a catalyst to produce a target substance, the pressure loss and coking are suppressed and the target substance can be produced in high yield. The present invention is related to a ring-shaped catalyst having a straight body part and a hollow body part, which is used when a gas-phase catalytic oxidation reaction of a material substance is conducted to produce a target substance, wherein a length of the straight body part is shorter than a length of the hollow body part and at least at one end part, a region from an end part of the straight body part to an end part of the hollow body part is concavely curved.Type: GrantFiled: September 24, 2019Date of Patent: April 18, 2023Assignee: Mitsubishi Chemical CorporationInventors: Kazuharu Tazawa, Takanori Taniguchi, Takuya Nakamura
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Patent number: 11084029Abstract: An object of the present invention is to provide a catalyst ensuring that in the case of causing gas-phase catalytic oxidation of an unsaturated aldehyde and an oxygen-containing gas with use of the catalyst to produce a corresponding unsaturated carboxylic acid, the pressure loss can be kept low and an unsaturated carboxylic acid can be produced with high selectivity. The present invention relates to a ring-shaped or columnar catalyst, which is used at the time of producing a corresponding unsaturated carboxylic acid by causing gas-phase catalytic oxidation of an unsaturated aldehyde and an oxygen-containing gas, wherein the outer peripheral edge part is inclined relative to the center line.Type: GrantFiled: January 24, 2019Date of Patent: August 10, 2021Assignee: Mitsubishi Chemical CorporationInventors: Kazuharu Tazawa, Yoshimune Abe, Mitsunobu Ito
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Patent number: 11033891Abstract: An object of the present invention is to provide a catalyst ensuring that in the case of causing gas-phase catalytic oxidation of an unsaturated aldehyde and an oxygen-containing gas with use of the catalyst to produce a corresponding unsaturated carboxylic acid, the pressure loss can be kept low and an unsaturated carboxylic acid can be produced with high selectivity. The present invention relates to a ring-shaped or columnar catalyst, which is used at the time of producing a corresponding unsaturated carboxylic acid by causing gas-phase catalytic oxidation of an unsaturated aldehyde and an oxygen-containing gas, wherein the outer peripheral edge part is inclined relative to the center line.Type: GrantFiled: January 24, 2019Date of Patent: June 15, 2021Assignee: Mitsubishi Chemical CorporationInventors: Kazuharu Tazawa, Yoshimune Abe, Mitsunobu Ito
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Publication number: 20200016577Abstract: An object of the present invention is to provide a catalyst ensuring that when a gas-phase catalytic oxidation reaction of a material substance is conducted using a catalyst to produce a target substance, the pressure loss and coking are suppressed and the target substance can be produced in high yield. The present invention is related to a ring-shaped catalyst having a straight body part and a hollow body part, which is used when a gas-phase catalytic oxidation reaction of a material substance is conducted to produce a target substance, wherein a length of the straight body part is shorter than a length of the hollow body part and at least at one end part, a region from an end part of the straight body part to an end part of the hollow body part is concavely curved.Type: ApplicationFiled: September 24, 2019Publication date: January 16, 2020Applicant: Mitsubishi Chemical CorporationInventors: Kazuharu TAZAWA, Takanori TANIGUCHI, Takuya NAKAMURA
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Publication number: 20190151835Abstract: An object of the present invention is to provide a catalyst ensuring that in the case of causing gas-phase catalytic oxidation of an unsaturated aldehyde and an oxygen-containing gas with use of the catalyst to produce a corresponding unsaturated carboxylic acid, the pressure loss can be kept low and an unsaturated carboxylic acid can be produced with high selectivity. The present invention relates to a ring-shaped or columnar catalyst, which is used at the time of producing a corresponding unsaturated carboxylic acid by causing gas-phase catalytic oxidation of an unsaturated aldehyde and an oxygen-containing gas, wherein the outer peripheral edge part is inclined relative to the center line.Type: ApplicationFiled: January 24, 2019Publication date: May 23, 2019Applicant: Mitsubishi Chemical CorporationInventors: Kazuharu Tazawa, Yoshimune Abe, Mitsunobu Ito
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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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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: 7255817Abstract: A method for compression molding a cylindrical tablet is presented, the method being capable of preventing the occurrence of cracks and the breakage of core punches. The method for compression molding a cylindrical tablet is achieved by using a rotary powder compression molding machine provided with a die and upper and lower punches fitted to a rotary table and a core punch penetrating the punch end of a lower punch. The compression molding method being characterized by using the core punch in which the difference between the smallest diameter of the core punch at the protion for forming the center opening of the cylindrical tablet and the reference diameter of the portion in design is within 0.04 mm.Type: GrantFiled: January 31, 2005Date of Patent: August 14, 2007Assignee: Mitsubishi Chemical CorporationInventors: Kazuharu Tazawa, Atsuhisa Maeda
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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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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: 20050263926Abstract: A method for compression-molding a cylindrical tablet is presented, the method being capable of preventing the occurrence of cracks and the breakage of core punches.Type: ApplicationFiled: January 31, 2005Publication date: December 1, 2005Applicant: Mitsubishi Chemical CorporationInventors: Kazuharu Tazawa, Atsuhisa Maeda
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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