Miyoshi Yushi Kabushiki Kaisha

Richo Company, Ltd.

Masatake Kawashima

Masafumi Moriya

Kazuo Hosoda

Katsushi Sugiyama

Kazuhiro Terada

Fumio Kawamura

Masaru Shimada

Kyoji Tsutsui

Takashi Ogawa

Masafumi Torii

Hiromi Furuya

Shoji Maruyama

Hiroaki Matsui

Katsuhisa Kamio

Hiroyuki Okayama

Formation of dioxins in flue gases is inhibited by contacting the flue gas with at least one of sodium phosphite, calcium phosphate, sodium hypophosphite, and calcium as reducing agents preferably at a temperature in the range of from 150&deg; C. to 850&deg; C. Hydrogen chlorides are also rendered harmless by the contact with the reducing agent. Also, metal ions contained in the fly ash of the flue gas are reduced to metals to reduce the occurrence of dissolution of the metals in subsequent treatment of the fly ash.

Method of making flue gas harmless

Disclosed herein are a solid waste treatment agent comprising phosphorous acid or a derivative thereof and/or hypophosphorous acid or a derivative thereof, or phosphorous acid or a derivative thereof and/or hypophosphorous acid or a derivative thereof, and an aluminum compound and/or a titanium compound, and a method of treating solid waste, which comprises adding the solid waste treatment agent to solid waste containing harmful metals and/or organic chlorinated compounds such as dioxins and PCB to make the solid waste harmless. When the solid waste treatment agent comprising phosphorous acid or a derivative thereof and/or hypophosphorous acid or a derivative thereof, and titanium oxide, or comprising phosphorous acid or a derivative thereof and/or hypophosphorous acid or a derivative thereof, titanium oxide and an aluminum compound is used as a solid waste treatment agent to treat solid waste under irradiation of rays, the solid waste can be effectively made harmless even when the treatment is conducted at a relatively low temperature.

Solid waste treatment agent and treatment method of solid waste

A thermally reversible color forming composition which includes an electron-donating chromophoric compound and an electron-accepting compound, by which formation and deletion of a color image may be carried out by adjusting thermal energy applied to the composition, wherein the electron-accepting compound is a carboxylic acid compound having the following general formula (1):

Thermally reversible color forming composition and thermally reversible

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Katsushika-ku, Japan

Masatake Kawashima