Mitsubishi Gas Chemical Company, Inc.

Tsukasa Toki

Shigeo Yoshinaka

Seiji Uchiyama

Yoshio Kawai

Koji Yamamoto

Takeshi Koyama

Koichi Kida

Masahiro Harada

Kazunobu Maruo

Hiroka Tanisake

Hideo Ikarashi

Yoshiharu Suzuki

Tomoji Tsuji

Shunichi Shinohara

Yasuo Inaba

Misuzu Wakatsuki

A process for the production of a polyamide, which comprises polycondensing adipic acid prepared by nitric acid oxidation and containing 1 ppm by weight or less of a free mineral acid as an impurity with a diamine represented by formula (1)

Process for production of polyamides, polyamides produced by said

A copolyesterimide composed of bis-trimellitimide units, 2,6-naphthalenedicarboxylic acid units, hydroquinone units and p-hydroxybenzic acid units. This copolyesterimide is melt-processable, and excels in heat resistance and mechanical properties.

Melt-processable copolyesterimide composed of bis-trimellitimide units

Xylyleneglycol is produced by diazotization reaction of xylylenediamine in the presence of more than 5 parts by weight of water per 1 part of xylylenediamine, while maintaining the PH of the reaction mixture in the range of 1.5 to 5.0.

Process for producing xylyleneglycol

In a process for producing aromatic aldehydes by reacting chlorinated methylbenzenes with nitric acid, the improvement wherein a lead compound is added to the residue left after separation and recovery of the resulting aromatic aldehydes from the reaction mixture thereby to remove a chlorine ion present in the residue as a precipitate of lead chloride, and the residue left after removal of the lead chloride is recycled to the reaction of the chlorinated methylbenzenes with nitric acid.

Process for producing aromatic aldehydes

An aromatic primary hydroperoxide is produced by oxidizing a methyl-substituted aromatic compound in a liquid phase with a molecular oxygen-containing gas at a temperature of 80.degree.-150.degree. C. under a pressure of the atmospheric to 100 kg/cm.sup.2 gage in the presence of 8-300 parts by weight of an aliphatic tertiary hydroperoxide per 100 parts by weight of the methyl-substituted aromatic compound. The oxidation reaction is promoted, an aromatic primary hydroperoxide content of the reaction products is increased, whereas by-products are reduced, and a selectivity to the aromatic primary hydroperoxide is considerably increased.

Process for producing aromatic primary hydroperoxide

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Niigata, Japan

Tsukasa Toki