Chiyoda Chemical Engineering Construction Co., Ltd.

Chiyoda Corporation

Haruo Nishino

Yoshio Ogawa

Kazushige Kawamura

Yoshiharu Tanaka

Osamu Yamamoto

Junichi Miyazaki

Toshio Kuroda

Shinichi Konishi

Hitoshi Wakui

Yohji Kameoka

Madoka Kawakami

Nobuo Kiyohara

Yoshiharu Matsui

Suguru Fukui

A process for the desulfurization of a sulfurous acid gas-containing waste gas by blowing the waste contact into an absorbing liquid through a plurality of sparger pipes is disclosed, wherein various operation conditions are specifically correlatively controlled to carry out the desulfurization in a stable manner at minimum costs.

Process for the desulfurization of sulfurous acid gas-containing waste

Wet-process stack gas purification method

Disclosed is an incinerating and melting apparatus for processing materials such as organic matters, inorganic matters and metals, which apparatus has a cylindrical or polygonal horizontal furnace body provided with a material charging port and a melt discharge port formed in the wall thereof, wherein a burner is mounted in the inner surface of the furnace body, the furnace body is oscillatorily rotatable in one and the other directions about its axis, and a melt receiver is detachably secured to the melt discharge port, or wherein the furnace body is fitted in a hood into which the melt discharge port opens and the melt receiver is detachably secured to the hood.

Incinerating and melting apparatus

Waste gas containing sulfur oxide (SO.sub.x) and nitrogen oxide (NO.sub.x) is mixed with an ozone-containing gas to have the value x of NO.sub.x fall in the range of 1.2 to 2.5 and thereafter brought into contact with an aqueous solution containing sulfuric acid, nitric acid and an iron compound to be deprived of SO.sub.x and NO.sub.x. To the solution with which the waste gas has been brought into contact, air or oxygen is added to effect oxidation of the part of said oxides still remaining therein in an unoxidized state and regenerate the activity of the iron compound functioning as a catalyst. Part of the solution to which the addition of air or oxygen has been made is recycled as the solution for the purpose of contact with waste gas.

Method for simultaneous removal of SO.sub.x and NO.sub.x

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Kawasaki, Japan

Haruo Nishino