Patents by Inventor Naoki Serata
Naoki Serata 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: 8278481Abstract: The present invention provides a method for effectively preventing the precipitation related to manganese acetate in the pipe for sending a polymerization inhibitor and the like, and the polymerization of (meth)acrylic acid. A first method of the present invention for producing (meth)acrylic acid, characterized in comprising steps of: producing a (meth)acrylic acid-containing gas by catalytic vapor phase oxidation reaction; and obtaining a (meth)acrylic acid-containing fluid by providing the (meth)acrylic acid-containing gas into a condensation column or an absorption column; wherein manganese acetate is used as a polymerization inhibitor; manganese acetate is dissolved into a (meth)acrylic acid aqueous solution containing not more than 10% by mass of (meth)acrylic acid, and the like, to obtain a manganese acetate aqueous solution; and the manganese acetate aqueous solution is provided into the condensation column or the absorption column.Type: GrantFiled: May 15, 2008Date of Patent: October 2, 2012Assignee: Nippon Shokubai Co., Ltd.Inventors: Kazuhiko Sakamoto, Naoki Serata, Toyofumi Sakai
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Publication number: 20100130778Abstract: The present invention provides a method for effectively preventing the precipitation related to manganese acetate in the pipe for sending a polymerization inhibitor and the like, and the polymerization of (meth)acrylic acid. A first method of the present invention for producing (meth)acrylic acid, characterized in comprising steps of: producing a (meth)acrylic acid-containing gas by catalytic vapor phase oxidation reaction; and obtaining a (meth)acrylic acid-containing fluid by providing the (meth)acrylic acid-containing gas into a condensation column or an absorption column; wherein manganese acetate is used as a polymerization inhibitor; manganese acetate is dissolved into a (meth)acrylic acid aqueous solution containing not more than 10% by mass of (meth)acrylic acid, and the like, to obtain a manganese acetate aqueous solution; and the manganese acetate aqueous solution is provided into the condensation column or the absorption column.Type: ApplicationFiled: May 15, 2008Publication date: May 27, 2010Inventors: Kazuhiko Sakamoto, Naoki Serata, Toyofumi Sakai
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Patent number: 7511172Abstract: A method for producing acrylic acid by absorbing acrylic acid at a high ratio and obtaining an acrylic acid-containing solution of high concentration is provided. This method comprises a step of circulating part of a discharged gas from an absorption step of acrylic acid to the reactor and discarding the remainder to the out side of system while the gas is cooled before circulation to the reactor. By the method, the acrylic acid-containing solution of high concentration is obtained due to decrease of an acrylic acid loss.Type: GrantFiled: July 23, 2007Date of Patent: March 31, 2009Assignee: Nippon Shokubai Co., Ltd.Inventors: Harunori Hirao, Kouji Ueno, Naoki Serata, Takeshi Yokogoshiya
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Patent number: 7368602Abstract: There is provided a process for producing (meth)acrylic acid including an absorption step of bringing a (meth)acrylic acid-containing gas obtained by a gas phase catalytic oxidation method into an absorption tower and allowing the gas to contact with an absorbent, in which absorption step a crude (meth)acrylic acid solution is withdrawn from a withdrawal outlet positioned between a supply point for the (meth)acrylic acid-containing gas and a supply point for the absorbent on the absorption tower, and then supplied to a next step. The process for producing (meth)acrylic acid makes it possible to suppress the formation of Michael adducts, thereby obtaining a (meth)acrylic acid containing solution in high yield and in high concentration.Type: GrantFiled: January 19, 2007Date of Patent: May 6, 2008Assignee: Nippon Shokubai Co., Ltd.Inventors: Toyofumi Sakai, Naoki Serata
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Patent number: 7332626Abstract: A method for producing acrylic acid by absorbing acrylic acid at a high ratio and obtaining an acrylic acid-containing solution of high concentration is provided. This method comprises a step of circulating part of a discharged gas from an absorption step of acrylic acid to the reactor and discarding the remainder to the out side of system while the gas is cooled before circulation to the reactor. By the method, the acrylic acid-containing solution of high concentration is obtained due to decrease of an acrylic acid loss.Type: GrantFiled: June 2, 2004Date of Patent: February 19, 2008Assignee: Nippon Shokubai Co., Ltd.Inventors: Harunori Hirao, Kouji Ueno, Naoki Serata, Takeshi Yokogoshiya
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Patent number: 7321060Abstract: A method for the production of acrylic acid of high concentration by absorbing acrylic acid with high absorption ratio of acrylic acid is provided. In a method for producing acrylic acid by a procedure comprising a step of catalytic gas phase oxidation reaction and a step of absorbing the acrylic acid-containing gas, while a low boiling substance-containing solution is introduced into the absorption column via a portion different from the top of the column.Type: GrantFiled: June 2, 2004Date of Patent: January 22, 2008Assignee: Nippon Shokubai Co., Ltd.Inventors: Naoki Serata, Kouji Ueno, Harunori Hirao, Takeshi Yokogoshiya
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Publication number: 20070270611Abstract: A method for producing acrylic acid by absorbing acrylic acid at a high ratio and obtaining an acrylic acid-containing solution of high concentration is provided. This method comprises a step of circulating part of a discharged gas from an absorption step of acrylic acid to the reactor and discarding the remainder to the out side of system while the gas is cooled before circulation to the reactor. By the method, the acrylic acid-containing solution of high concentration is obtained due to decrease of an acrylic acid loss.Type: ApplicationFiled: July 23, 2007Publication date: November 22, 2007Inventors: Harunori Hirao, Kouji Ueno, Naoki Serata, Takeshi Yokogoshiya
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Publication number: 20070173667Abstract: There is provided a process for producing (meth)acrylic acid including an absorption step of bringing a (meth)acrylic acid-containing gas obtained by a gas phase catalytic oxidation method into an absorption tower and allowing the gas to contact with an absorbent, in which absorption step a crude (meth)acrylic acid solution is withdrawn from a withdrawal outlet positioned between a supply point for the (meth)acrylic acid-containing gas and a supply point for the absorbent on the absorption tower, and then supplied to a next step. The process for producing (meth)acrylic acid makes it possible to suppress the formation of Michael adducts, thereby obtaining a (meth)acrylic acid containing solution in high yield and in high concentration.Type: ApplicationFiled: January 19, 2007Publication date: July 26, 2007Inventors: Toyofumi Sakai, Naoki Serata
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Patent number: 7183428Abstract: A method for producing acrylic acid by using an acrylic acid-containing solution of high concentration without azeotropic distillation is provided. This method of producing acrylic acid comprises introducing an acrylic acid-containing gas obtained by catalytic gas phase oxidation reaction into an absorption column and supplying the acrylic acid-containing solution to crystallization step thereby separating the solution into acrylic acid and residual mother liquid, and distilling at least part of the residual mother liquid and circulating the distillate obtained by the distillation to the absorption column.Type: GrantFiled: June 2, 2004Date of Patent: February 27, 2007Assignee: Nippon Shokubai Co., Inc.Inventors: Kouji Ueno, Harunori Hirao, Naoki Serata, Takeshi Yokogoshiya
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Patent number: 7151194Abstract: A method for producing acrylic acid from an acrylic acid-containing solution of high concentration without performing azeotropic distillation is provided. This method of producing acrylic acid comprises steps of absorbing acrylic acid-containing gas, distilling the acrylic acid-containing solution without using an azeotropic solvent thereby obtaining crude acrylic acid as a column bottom stream and/or a column side stream, and supplying the crude acrylic acid to a crystallizing step and melt crystallizing the crude acrylic acid thereby obtaining purified acrylic acid.Type: GrantFiled: June 2, 2004Date of Patent: December 19, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Kouji Ueno, Harunori Hirao, Naoki Serata, Takeshi Yokogoshiya
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Patent number: 6900346Abstract: A method for the decomposition of a Michael type adduct, characterized by causing a Michael type adduct to react in the presence of an N-oxyl compound thereby decomposing the Michael type adduct into acrylic acid and/or the acrylic ester and/or the alcohol and a method for the production of acrylic acid and/or the acrylic ester, characterized by comprising a step of recovering a Michael type adduct formed in the process for the production of acrylic acid or acrylic ester and a step of decomposing the recovered Michael type adduct by the method of decomposition mentioned above. This invention, therefore, allows promotion of efficient utilization of the raw materials.Type: GrantFiled: June 27, 2002Date of Patent: May 31, 2005Assignee: Nippon Shokubai Co., Inc.Inventors: Fumio Shibusawa, Naoki Serata, Kazuhiko Sakamoto
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Patent number: 6870066Abstract: A method for the decomposition of a Michael type adduct of an acrylic acid and/or an acrylic ester represented by the following formula [I] or [II] is disclosed, wherein decomposing the Michael type adduct in the presence of at least one copper salt and at least one metal salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt into an acrylic acid and/or an acrylic ester and/or an alcohol. CH2?CHCOO(—X—COO)n—R1??[I] R2—O(—X—COO)m—R3??[II] (wherein n and m denote an integer in the range of 1-5, R1, R2, and R3 independently denote a hydrogen atom or an alkyl group, and —X— denotes —CH2CH2— or —CH(CH3)—, and —X— may be identical or different when n is 2 or more).Type: GrantFiled: March 10, 2003Date of Patent: March 22, 2005Assignee: Nippon Shokubai Co., LTDInventors: Fumio Shibusawa, Naoki Serata, Kazuhiko Sakamoto
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Publication number: 20040249199Abstract: A method for producing acrylic acid by using an acrylic acid-containing solution of high concentration without azeotropic distillation is provided. This method of producing acrylic acid comprises introducing an acrylic acid-containing gas obtained by catalytic gas phase oxidation reaction into an absorption column and supplying the acrylic acid-containing solution to crystallization step thereby separating the solution into acrylic acid and residual mother liquid, and distilling at least part of the residual mother liquid and circulating the distillate obtained by the distillation to the absorption column.Type: ApplicationFiled: June 2, 2004Publication date: December 9, 2004Inventors: Kouji Ueno, Harunori Hirao, Naoki Serata, Takeshi Yokogoshiya
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Publication number: 20040249201Abstract: A method for producing acrylic acid from an acrylic acid-containing solution of high concentration without performing azeotropic distillation is provided. This method of producing acrylic acid comprises steps of absorbing acrylic acid-containing gas, distilling the acrylic acid-containing solution without using an azeotropic solvent thereby obtaining crude acrylic acid as a column bottom stream and/or a column side stream, and supplying the crude acrylic acid to a crystallizing step and melt crystallizing the crude acrylic acid thereby obtaining purified acrylic acid.Type: ApplicationFiled: June 2, 2004Publication date: December 9, 2004Inventors: Kouji Ueno, Harunori Hirao, Naoki Serata, Takeshi Yokogoshiya
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Publication number: 20040249202Abstract: A method for producing acrylic acid by absorbing acrylic acid at a high ratio and obtaining an acrylic acid-containing solution of high concentration is provided. This method comprises a step of circulating part of a discharged gas from an absorption step of acrylic acid to the reactor and discarding the remainder to the out side of system while the gas is cooled before circulation to the reactor. By the method, the acrylic acid-containing solution of high concentration is obtained due to decrease of an acrylic acid loss.Type: ApplicationFiled: June 2, 2004Publication date: December 9, 2004Inventors: Harunori Hirao, Kouji Ueno, Naoki Serata, Takeshi Yokogoshiya
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Publication number: 20040249200Abstract: A method for the production of acrylic acid of high concentration by absorbing acrylic acid with high absorption ratio of acrylic acid is provided. In a method for producing acrylic acid by a procedure comprising a step of catalytic gas phase oxidation reaction and a step of absorbing the acrylic acid-containing gas, while a low boiling substance-containing solution is introduced into the absorption column via a portion different from the top of the column.Type: ApplicationFiled: June 2, 2004Publication date: December 9, 2004Inventors: Naoki Serata, Kouji Ueno, Harunori Hirao, Takeshi Yokogoshiya
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Publication number: 20030204106Abstract: A method for the decomposition of a Michael type adduct of an acrylic acid and/or an acrylic ester represented by the following formula [I] or [II] is disclosed, wherein decomposing the Michael type adduct in the presence of at least one copper salt and at least one metal salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt into an acrylic acid and/or an acrylic ester and/or an alcohol.Type: ApplicationFiled: March 10, 2003Publication date: October 30, 2003Inventors: Fumio Shibusawa, Naoki Serata, Kazuhiko Sakamoto
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Publication number: 20030028051Abstract: A method for the decomposition of a Michael type adduct, characterized by causing a Michael type adduct to react in the presence of an N-oxyl compound thereby decomposing the Michael type adduct into acrylic acid and/or the acrylic ester and/or the alcohol and a method for the production of acrylic acid and/or the acrylic ester, characterized by comprising a step of recovering a Michael type adduct formed in the process for the production of acrylic acid or acrylic ester and a step of decomposing the recovered Michael type adduct by the method of decomposition mentioned above. This invention, therefore, allows promotion of efficient utilization of the raw materials.Type: ApplicationFiled: June 27, 2002Publication date: February 6, 2003Inventors: Fumio Shibusawa, Naoki Serata, Kazuhiko Sakamoto
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Patent number: 6300513Abstract: It intends to prevent the reduction in quantity with time of an oxyl compound in vinyl compounds. The quantity reduction of the N-oxyl compound is suppressed by causing an N-oxyl compound, N-hydroxy-2,2,6,6-tetramethylpiperidine compound and a 2,2,6,6-tetramethylpiperidine compound to co-exist in vinyl compounds.Type: GrantFiled: December 5, 2000Date of Patent: October 9, 2001Assignee: Nippon Shokubai Co., Ltd.Inventors: Kazuhiko Sakamoto, Naoki Serata, Kouji Ueno, Sei Nakahara, Masatoshi Ueoka
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Publication number: 20010005755Abstract: It intends to prevent the reduction in quantity with time of an N-oxyl compound in vinyl compounds. The quantity reduction of the N-oxyl compound is suppressed by causing an N-oxyl compound, N-hydroxy-2,2,6,6-tetramethylpiperidine compound and a 2,2,6,6-tetramethylpiperidine compound to co-exist in vinyl compounds.Type: ApplicationFiled: December 5, 2000Publication date: June 28, 2001Inventors: Kazuhiko Sakamoto, Naoki Serata, Kouji Ueno, Sei Nakahara, Masatoshi Ueoka