Sakaitani
Hisashi Sakaitani, Tokyo JP
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20090169469 | Process for Hydrogen Peroxide Production Including Step for Regeneration of Working Solution - Provided is a provides a method for producing hydrogen peroxide, comprising a step of reducing and then oxidizing a working solution containing an organic solvent, anthraquinone having an alkyl substituent, and tetrahydroanthraquinone having an alkyl substituent to produce hydrogen peroxide; and a working solution regeneration step of removing an inert substance, generated as a sub product by the production of hydrogen peroxide, from the working solution and re-circulating the working solution deprived of the inert substance back into the step of producing hydrogen peroxide; wherein the working solution regeneration step includes i) a first distillation step of recovering the organic solvent by distillation performed at an atmospheric or a lower pressure; and ii) a second distillation step of, following the first distillation step, recovering the anthraquinone and the tetrahydroanthraquinone by distillation performed at a still lower pressure at 200° C. or higher for a residence time of 1 hour or longer. | 07-02-2009 |
Hisashi Sakaitani, Ibaraki JP
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20080213164 | Method for producing hydrogen peroxide - The present invention provides a method for producing hydrogen peroxide, comprising the steps of: alternately reducing and oxidizing a working solution containing anthraquinone compounds as a reaction medium, wherein a mixture of alkyl-substituted anthraquinones and alkyl-substituted tetrahydroanthraquinones in a molar ratio of from 2:1 to 8:1 is used as the anthraquinone compounds in the working solution, in the reduction step all of the tetrahydroanthraquinones and some or all of the anthraquinones in the working solution are reduced; and keeping the content of alkyl-substituted anthrahydroquinones in the working solution after the reduction step and before the oxidation step higher than the content of alkyl-substituted tetrahydroanthrahydroquinones, wherein ethylanthraquinone and ethyltetrahydroanthraquinone are used as anthraquinone compounds in the working solution in a total proportion of both of from 10 to 45 mol % of all of the anthraquinone compounds in the working solution. | 09-04-2008 |
Masahiro Sakaitani, Kamakura-Shi JP
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20090275623 | ALPHA-AMINO ACID DERIVATIVES AND MEDICAMENTS CONTAINING THE SAME AS AN ACTIVE INGREDIENT - The present invention provides novel α-amino acid derivatives of formula (1): | 11-05-2009 |
20110092700 | Novel Coumarin Derivative Having Antitumor Activity - The present invention provides a compound represented by general formula (1) below or a pharmaceutically acceptable salt thereof: | 04-21-2011 |
Masahiro Sakaitani, Kanagawa JP
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20080319047 | Novel Glucitol Derivative, Prodrug Thereof And Salt Thereof, And Therapeutic Agent Containing The Same For Diabetes - The invention provides a glucitol derivative having the function of reducing a blood sugar level and having preferable properties required of medicines, such as long-lasting drug activity; and a medicinal composition for use in the prevention or treatment of diseases attributable to hyperglycemia, such as diabetes, complications of diabetes, and obesity. The derivative is a compound represented by the formula (I): | 12-25-2008 |
20100004233 | NOVEL COUMARIN DERIVATIVE HAVING ANTITUMOR ACTIVITY - The present invention provides a compound represented by general formula (1) below or a pharmaceutically acceptable salt thereof: | 01-07-2010 |
20110009398 | p27 Protein Inducer - The present invention provides a p27 protein inducing agent comprising a compound represented by general formula (11) below or pharmaceutically acceptable salt thereof as an active ingredient: | 01-13-2011 |