Mitsubishi Gas Chemical Company, Inc.

Kaoru Tsuyuki

Tomiya Isshiki

Kiyoshi Yoshida

Tetsuo Koshitsuka

Wakana Uesugi

Norio Takeda

Tetsuo Aoyama

Takao Kondo

Osamu Aoki

Toshihiko Kobayashi

Mitsuo Miura

Tetsuo Tomita

Mitsuo Abe

Yoshiyuki Aoki

Toshiaki Kozaki

Toshio Kondoh

Hisashi Yoshino

The invention provides a method for producing a peroxymonosulfuric acid solution with high stability, including the steps of mixing 35 mass % or more of hydrogen peroxide and 70 mass % or more of sulfuric acid to react them, cooling the reaction solution to 80&#xb0; C. or lower within five minutes after initiation of the mixing step, and diluting the reaction solution with water four times or more as much as the reaction solution by mass.

Method for producing peroxymonosulfuric acid and apparatus for continuously producing peroxymonosulfuric acid

A flux washing agent which comprises an aqueous solution containing a quaternary ammonium salt and hydrazine is disclosed. The flux washing agent is used in the production of printed circuit boards and the like. The flux washing agent has a washing ability, and a property to suppress etching of solder which are comparable with those of Flon 113 and trichloroethylene heretofore used as flux washing agents. Furthermore, the flux washing agent is safe, does not cause environmental pollution and has an excellent rinsing property.

Flux washing agent

In a process for recovering an aliphatic carboxylic acid and/or an ester thereof by distilling a liquid mixture containing the aliphatic carboxylic acid and/or the ester thereof and a catalyst of a metal of Group VIII of the periodic table of elements, the improvement wherein the distillation is carried out in the presence of carbon monoxide at a partial pressure of at least 0.01 kg/cm.sup.2 (absolute) in the distillation system to prevent the decomposition of said catalyst.

Process for recovering a reaction product while preventing decomposition

Hydrazine sulfate having a relatively large particle diameter and a high purity is produced by hydrolysis of benzophenoneazines by sulfuric acid having a concentration of 75% by weight or less in an amount of 1.1 times by mole or more the stoichiometric amount in a very high conversion and a high yield with less operational loss.

Process for producing hydrazine sulfate

Growing community of inventors

Tokyo, Japan

Kaoru Tsuyuki