Arakawa Chemical Industries, Ltd.

National Institute of Advanced Industrial Science and Technology

Arakawa Kagaku Kogyo Kabushiki Kaisha

Yoichiro Ezaki

Naoki Sasagawa

Kiyoshi Takumi

Kazuhiko Sato

Yoshihiro Kon

Yutaka Ono

The purpose of the present invention is to provide a method for efficiently removing a quaternary salt from an organic solvent. The present invention relates to a method for removing a quaternary salt, the method including: contacting a solution of a quaternary salt in an organic solvent with an aqueous solution containing at least one member selected from the group consisting of (a1) compounds having one or more anionic functional groups and (a2) polymers having at least one member selected from the group consisting of carboxyl group and sulfonic acid group, thereby removing the quaternary salt from the organic solvent.

Method for removing quaternary salt

To provide a method for producing an epoxy compound having fewer residual quaternary salt compound by removing the quaternary salt compound from an organic solution containing an epoxy compound and the quaternary salt compound. A method for producing an epoxy compound comprising the following step 1, step 2, and step 3:

Method for producing epoxy compound

The present invention provides a method for producing an epoxy compound, comprising oxidizing a carbon-carbon double bond of an organic compound by hydrogen peroxide in the presence of a neutral inorganic salt and a mixed catalyst of a tungsten compound (a), at least one phosphorus compound selected from the group consisting of phosphoric acids, phosphonic acids, and salts thereof (b) and a surfactant (c), and an epoxidizing method comprising oxidizing a carbon-carbon double bond by hydrogen peroxide in the presence of the catalyst and the neutral inorganic salt.

Method for manufacturing an epoxy compound and method for epoxidizing a carbon&#x2014;carbon double bond

What is disclosed an aromatic oligoimine having a recurring unit composed of an aromatic dialdehyde having a phenolic hydroxyl group and an aromatic diamine and a number-average degree of polymerization of 2 to 20 and a process for preparing the same, and an aromatic polyimine made by thermally dehydrating the aromatic oligoimine and a process for preparing the same.

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Tsukuba, Japan

Yoichiro Ezaki