Showa Denko Kabushiki Kaisha

Iwao Kojima

Juichi Kasai

Keiji Kawasaki

Yoku Ashigame

Fujio Namigata

Hiroshi Mihara

Isamu Sasaki

Buntaro Kawase

A method of removing mercury vapor from a gas contaminated therewith comprising washing said gas with an acid solution of divalent mercury ions, the concentration of which ranges from 0.5 to 100g per liter, at room temperature and atmospheric pressure; and rewashing the resultant gas with an acid solution of divalent mercury ions, the concentration of which ranges from 0.05 to 0.5g per liter, at room temperature and atmospheric pressure to obtain a purified gas containing mercury vapor of less than 0.01 mg/Nm.sup.3, that is, 0.001 ppm.

Method of removing mercury vapor from gases contaminated therewith

Water-reducing additives for ceramic material, and especially for cement paste, mortar or concrete, which comprise a phenolic compound having a sulfo radical or a sulfomethyl radical, wherein the hydrogen atoms of acidic radicals in part of said phenolic compound molecules are substituted by atoms of sodium, potassium or calcium.

Water-reducing admixtures for ceramic pastes

Growing community of inventors

Yokohama, Japan

Iwao Kojima