Patents by Inventor Tohru Endoh
Tohru Endoh 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: 7897814Abstract: Disclosed is a method for extracting methacrylic acid, in which an extraction solvent is added to a methacrylic acid aqueous solution for transferring methacrylic acid to the extraction solvent. In this method, a solvent containing t-butyl methacrylate is used as the extraction solvent.Type: GrantFiled: December 26, 2006Date of Patent: March 1, 2011Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Tohru Endoh, Kazunori Matake, Shigeho Tanaka, Haruki Sato
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Patent number: 7803964Abstract: Disclosed is a method for synthesizing t-butyl (meth)acrylate at low cost. Specifically, disclosed is a method for synthesizing a carboxylic acid ester by performing an addition reaction between isobutylene and (meth)acrylic acid in the presence of an acidic catalyst. This method includes the steps of: (A) performing a dehydration decomposition reaction of t-butyl alcohol in the presence of a first acidic catalyst; (B) obtaining crude isobutylene gas by separating at least water from a produced gas obtained in the step A; (C) absorbing the crude isobutylene gas in an absorption solvent containing (meth)acrylic acid; and (D) producing t-butyl (meth)acrylate by performing the addition reaction by bringing the absorption solvent which has absorbed the crude isobutylene gas into contact with a second acidic catalyst.Type: GrantFiled: February 6, 2006Date of Patent: September 28, 2010Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Shigeho Tanaka, Tohru Endoh, Haruki Sato, Toshihiro Sato, Kazutaka Inoue
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Publication number: 20100228053Abstract: Disclosed is a method for extracting methacrylic acid, in which an extraction solvent is added to a methacrylic acid aqueous solution for transferring methacrylic acid to the extraction solvent. In this method, a solvent containing t-butyl methacrylate is used as the extraction solvent.Type: ApplicationFiled: December 26, 2006Publication date: September 9, 2010Applicant: Mitsubishi Rayon Co., Ltd.Inventors: Tohru Endoh, Kazunori Matake, Shigeho Tanaka, Haruki Sato
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Patent number: 7709690Abstract: Disclosed is a method for producing tertiary butyl alcohol through hydration reaction of isobutylene and water in the presence of a cation exchange resin by using a reactor having at least two reactor vessels provided in series. The method is characterized in that a fluid in a reactor vessel at the most downstream side forms a two-liquid phase and the reaction temperature of the reactor vessel is kept at 70° C. or lower, and a fluid in at least one reactor vessel other than the one at the most downstream side forms a homogeneous phase.Type: GrantFiled: December 15, 2005Date of Patent: May 4, 2010Assignee: Mitsubishi Rayon Co., Ltd.Inventors: Tohru Endoh, Shigeho Tanaka, Haruki Sato
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Publication number: 20090253945Abstract: Disclosed is a method for producing tertiary butyl alcohol through hydration reaction of isobutylene and water in the presence of a cation exchange resin by using a reactor having at least two reactor vessels provided in series. The method is characterized in that a fluid in a reactor vessel at the most downstream side forms a two-liquid phase and the reaction temperature of the reactor vessel is kept at 70° C. or lower, and a fluid in at least one reactor vessel other than the one at the most downstream side forms a homogeneous phase.Type: ApplicationFiled: December 15, 2005Publication date: October 8, 2009Applicant: MITSUBISHI RAYON CO., LTD.Inventors: Tohru Endoh, Shigeho Tanaka, Haruki Sato
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Publication number: 20090012327Abstract: Disclosed is a method for synthesizing t-butyl (meth)acrylate at low cost. Specifically, disclosed is a method for synthesizing a carboxylic acid ester by performing an addition reaction between isobutylene and (meth)acrylic acid in the presence of an acidic catalyst. This method includes the steps of: (A) performing a dehydration decomposition reaction of t-butyl alcohol in the presence of a first acidic catalyst; (B) obtaining crude isobutylene gas by separating at least water from a produced gas obtained in the step A; (C) absorbing the crude isobutylene gas in an absorption solvent containing (meth)acrylic acid; and (D) producing t-butyl (meth)acrylate by performing the addition reaction by bringing the absorption solvent which has absorbed the crude isobutylene gas into contact with a second acidic catalyst.Type: ApplicationFiled: February 6, 2006Publication date: January 8, 2009Applicant: Mitsubishi Rayon co., Ltd.Inventors: Shigeho Tanaka, Tohru Endoh, Haruki Sato, Toshihiro Sato, Kazutaka Inoue
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Patent number: 7411086Abstract: The present invention is to provide a method of producing an N-alkylaminoalkyl (meth)acrylate containing a small amount of low boiling components, especially, containing a small amount of raw components, without any complicated operations or special apparatuses. The method of producing an N-alkylaminoalkyl (meth)acrylate comprising the steps of: (A) performing the reaction between the (meth)acrylic acid ester and the N-alkylaminoalkyl alcohol in a presence of a catalyst to obtain a reaction solution containing the N-alkylaminoalkyl (meth)acrylate; (B) distilling out components which have lower boiling points than the N-alkylaminoalkyl (meth)acrylate from the reaction solution obtained by the step (A); and (C) distilling the N-alkylaminoalkyl (meth)acrylate; and further comprising the step of: (D) adjusting water concentration at a range from 0.01 to 1 wt %. in the reaction solution which is located after the step (A) and before the step (C).Type: GrantFiled: May 27, 2004Date of Patent: August 12, 2008Assignee: Dia-Nitrix Co., Ltd.Inventors: Shuhei Otsuka, Akira Ogawa, Tohru Endoh, Shingo Tanaka
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Publication number: 20060287550Abstract: The present invention is to provide a method of producing an N-alkylaminoalkyl(meth)acrylate containing a small amount of low boiling components, especially, containing a small amount of raw components, without any complicated operations or special apparatuses. The method of producing an N-alkylaminoalkyl(meth)acrylate comprising the steps of: (A) performing the reaction between the (meth)acrylic acid ester and the N-alkylaminoalkyl alcohol in a presence of a catalyst to obtain a reaction solution containing the N-alkylaminoalkyl(meth)acrylate; (B) distilling out components which have lower boiling points than the N-alkylaminoalkyl(meth)acrylate from the reaction solution obtained by the step (A); and (C) distilling the N-alkylaminoalkyl (meth)acrylate; and further comprising the step of: (D) adjusting water concentration at a range from 0.01 to 1 wt %. in the reaction solution which is located after the step (A) and before the step (C).Type: ApplicationFiled: May 27, 2004Publication date: December 21, 2006Applicant: Mitsubishi Rayon Co., Ltd.Inventors: Shuhei Otsuka, Akira Ogawa, Tohru Endoh, Shingo Tanaka