Tosoh Corporation

Mitsuru Takahashi

Hajime Funakoshi

Hideo Shuyama

Kiyotaka Oyama

Yukihiro Tsutsumi

Osamu Miyano

Novel iron sulfides having excellent durability and excellent treating properties of heavy metals, processes for producing the iron sulfides, iron sulfide mixture, a heavy metal treating agent containing either of these novel iron sulfides as an effective component, and a method by which wastes containing various heavy metals are treated with the heavy metal treating agent are disclosed. The iron sulfide having a mackinawite structure which contains FeMNSwherein M represents an alkaline earth metal, N represents an alkali metal, and x, y and z, indicating the molar proportions of the respective elements, represent numbers satisfying 0.01&#x3c;x&#x2266;0.5, y&#x2266;0.2 and 0.7&#x2266;z&#x2266;1.4, as an essential component.

Iron sulfide mixtures; iron sulfide heavy metal treating agents; and methods of treating using such agents

Novel iron sulfides having excellent durability and excellent treating properties of heavy metals, processes for producing the iron sulfides, iron sulfide mixture, a heavy metal treating agent containing either of these novel iron sulfides as an effective component, and a method by which wastes containing various heavy metals are treated with the heavy metal treating agent are disclosed. The iron sulfide having a mackinawite structure which contains FeM N S wherein M represents an alkaline earth metal, N represents an alkali metal, and x, y and z, indicating the molar proportions of the respective elements, represent numbers satisfying 0.01<x&lE;0.5, y&lE;0.2 and 0.7&lE;z&lE;1.4, as an essential component.

Iron sulfides, processes for producing the same, iron sulfide mixture, heavy metal treating agent, and method of treating with the agent

A method for preparing .alpha., .beta.-unsaturated carboxylic acids of the formula

Method for preparation of .alpha., .beta.-unsaturated carboxylic acid

Process for producing fluorine-containing aliphatic carboxylic acids having the general formula of Y--R.sub.f --Y' as defined herein by reaction of fluorine-containing aliphatic halogen compounds having the general formula of X--R.sub.4 --X' as defined herein with carbon dioxide under the presence of zinc in an organic solvent and hydrolysis of the reaction product, wherein the improvement comprises controlling the concentration of carbon dioxide in the organic solvent at a level of 0.3 to 5 mol/l.

Growing community of inventors

Shinnanyo, Japan

Mitsuru Takahashi