Nippon Shokubai Kagaku Kogyo Co., Ltd.

Akio Fukui

Yuichi Kita

Hiroshi Koike

Yuji Ito

Yoichi Nakagawa

Takehiko Tanaka

Masao Baba

Kazuo Kishino

Kentaro Sakamoto

Koichi Nakagawa

Miaki Asakawa

Yukio Okuda

Hitoshi Kanei

Masao Nakano

Masakazu Nakagawa

Yusei Nagamura

A preparation of metallic salt of ethercarboxylic acid in a pure form by restraining the formation of fumaric acid likely to occur when maleic acid and/or maleic anhydride react with oxycarboxylic acid. The ethercarboxylic product is a useful chelating agent.

Process for producing metallic salt of ethercarboxylic acid

A method for the production of a maleimide, which comprises effecting a former-stage reaction by adding maleic anhydride and a primary amine in amounts such that the molar ratio of said maleic anhydride to said primary amine is less than 1 under application of heat to a water-insoluble or water-immisible inert organic solvent containing an acid catalyst and subsequently carrying out a latter-stage reaction by adding to the reaction system maleic anhydride in an amount such that the molar ratio of the total amount of maleic anhydride to be added to said reaction system to the total amount of said primary amine added to said reaction system exceeds 1.

Method for production of maleimides

Method for the transportation or storage of N-phenyl maleimide, which method comprises mixing N-phenyl maleimide with maleic anhydride in a ratio of 1 to 90 parts by weight of N-phenyl maleimide to 99 to 10 parts by weight of maleic anhydride and handling the resultant mixture in a molten state in the presence of a polymerization inhibitor, and a composition of liquid state.

Method for transportation and storage of N-phenyl maleimide in molten

A method for the production of a maleimide by dehydration and ring-closure of maleinamic acid obtained by the reaction of maleic anhydride with an amine, which method is characterized by effecting ring-closure imidation of said maleinamic acid by heating said maleinamic acid in a water-insoluble or water-immiscible inert organic non-polar solvent in the presence of a catalyst of an amine salt produced from the amine and an acid, a mixture of the amine salt and the acid, or a supported catalyst on a solid carrier the catalyst or the acid.

A process for the preparation of 1-substituted anthraquinones represented by the general formula I ##EQU1## where, in the formula, R.sub.1 and R.sub.2 represent individually a hydrogen atom or methyl group and X represents a hydroxylamino or amino group, Which comprises treating in a liquid medium a 5-nitro-1,4,4a,9a-tetrahydroanthraquinone represented by the general formula II ##EQU2## where, in the general formula, R.sub.1 and R.sub.2 represent individually a hydrogen atom or methyl group, In the presence of a basic compound with or without a reducing agent.

Process for the preparation of 1-substituted anthraquinones

A process for the preparation of 5-nitro-1,4-naphthoquinone comprising nitrating 1,4-naphthoquinone under such a condition that the dehydrating value of sulfuric acid in the reaction mixture is at least 4 to selectively introduce a nitro group into the 5-position and pouring the reaction mixture into an aqueous medium to precipitate the product.

Growing community of inventors

Fujisawa, Japan

Akio Fukui