Asahi Glass Company, Limited

Other

Mitsui Engineering & Shipbuilding

Hachiro Hirano

Makoto Yoshida

Masaharu Tanaka

Kenji Yamada

Yoichi Mori

Toshiya Matsubara

Shigeru Sakurai

Katsumasa Nakahara

Makoto Kusaka

Hiroaki Noda

Shintaro Kikuchi

Hisakazu Arima

Hiroo Mori

Yoshinao Hirano

Hiroaki Harada

Sigeru Sakurai

Masumi Itaya

Tomio Sugimoto

Kiyoshi Yamamoto

Hirokazu Wakabayashi

Shinichi Suzuki

Kiyotaka Arai

Fumiaki Nakashima

Hisao Inokuma

Noriko Torimoto

Kouichi Yokoyama

Minako Okamura

Masaharu Emoto

Kazutaka Ohtsuka

Itsuo Mochizuki

Yoshikatsu Kawabe

Michihiro Kawano

Hidetomi Haga

Teiji Kawada

Sadaji Narituka

Masakuni Satoh

Yasunori Yamaguchi

Yuriko Takahashi

A process for producing an alkali metal hydrogencarbonate by reacting an aqueous solution containing alkali metal ions with carbon dioxide in a prescribed crystallizer to precipitate crystals of an alkali metal hydrogencarbonate, and in this process a part of a slurry containing the alkali metal hydrogencarbonate crystals in the aqueous solution is withdrawn from the crystallizer and, after dissolution of a part of the crystals, it is returned to the crystallizer.

Process for producing alkali metal hydrogencarbonate

A method for producing a porous potassium carbonate, which comprises calcining potassium hydrogen carbonate crystals having a mean particle diameter of from 100 to 1,000 &#x3bc;m at a temperature of the object to be calcined of from 100 to 500&#xb0; C., while introducing a dry gas which has a dew point of not higher than 0&#xb0; C. and a temperature of from 10 to 50&#xb0; C.

Porous potassium carbonate having special pore structure and method for its production

A method for producing sodium hydrogencarbonate crystal particles having a low caking property, which comprises lowering the potassium concentration in sodium hydrogencarbonate crystal particles having a mean particle diameter of from 50 to 500 &#x3bc;m to a level of at most 50 mass ppm.

Sodium hydrogencarbonate crystal particles

A method for removing a halogen series gas, which comprises contacting a gas containing a halogen series gas forming at least one kind selected from the group consisting of HF, HCl, HBr and HI by water with a granule containing from 60 to 99.9 mass % of a solid base and from 0.1 to 40 mass % of a carbonaceous material to the total mass amount of the granule in the presence of water.

Method for removing halogen series gas

A sodium-based dechlorinating agent is added to a flue gas; hydrogen chloride contained in this flue gas is removed as residue of dechlorination; the thus removed residue of dechlorination is dissolved by adding water; water-insoluble constituents are separated from the resulting aqueous solution; and after adjusting pH of the aqueous solution remaining after separation of the water-insoluble constituents, mercury, dioxin, and the like are removed and discharged. The sodium-based dechlorinating agent is mixed with a hydrophilic anti-caking agent, with an angle of repose of 40&#xb0; or more, a dispersibility of less than 50, and a floodability index value of less than 90. This permits inhibition of occurrence of a pressure drop and leakage in the filter cloth of the dust collector.

Sodium-based dechlorinating agent and waste treatment equipment

A method for treating a gas, which comprises contacting a gas containing a boric acid component in an amount of at least 15 mg/m as converted into B O concentration in a standard state, with a solid alkali metal carbonate material comprising at least one member selected from the group consisting of alkali metal carbonates and alkali metal hydrogencarbonates, to remove the boric acid component from the gas.

Method for treating a gas containing a boric acid component

A method for treating a gas containing a SO component, which comprises adding a sodium carbonate powder having a mean particle diameter of at most 20 &mgr;m to the gas to remove the SO component from the gas.

Method for treating a gas

A method is provided for removing a halogen series gas, by bringing a halogen series gas into contact with a granulated product, the granulated product being obtainable by granulating, employing various methods including compression molding, extrusion molding, rotating granulation and agitation granulation, a powder of hydrogencarbonate having a mean particle diameter of primary particles 10-500 &mgr;m, wherein the granulated product has a mean particle diameter of 0.5-20 mm and a minimum average hardness that is dependent on the mean particle diameter.

Method for removing a halogen series gas

It is an object of the present invention to obtain a composite sol capable of forming an ink-receiving layer having a high transparency and a high property for fixing dyes. The present invention provides a sol which is a colloidal solution having aggregate particles containing silica and alumina dispersed in an aqueous medium, wherein the silica is such that the primary particles are spherical and the average particle size of the primary particles is from 2 to 200 nm, the average particle size of the aggregate particles is at least twice the average particle size of the silica primary particles and at most 1,000 nm, the &zgr;-potential of the aggregate particles is at least &plus;10 mV, and the pH of the solution is from 3 to 9. The present invention provides a method for producing a silica-alumina composite sol, which comprises gradually adding an aluminum salt of which the liquid exhibits acidity when dissolved in water, to a silica sol, and a method for producing a silica-alumina composite sol, which comprises mixing a silica sol with an alumina sol having a specific surface area of a xerogel obtainable by drying of at least 150 m /g, to form aggregate particles containing silica and alumina, followed by peptization treatment.

Silica-alumina composite sol, processes for producing the same, and recording medium

It is an object of the present invention to provide hollow glass microspheres having particle properties of a low particle density and grain size properties of a sharp grain size distribution, having a high homogeneity and having such strength that they are less likely to fracture during processing. In the present invention, a glass material containing a foaming agent and containing B O in an amount of from 9 to 20%, is subjected to wet grinding to obtain a slurry having an average particle size of at most 3 &mgr;m, droplets thereof are heated, to obtain hollow glass microspheres having an average particle size of at most 15 &mgr;m, a maximum particle size of at most 45 &mgr;m, a particle density of at most 0.5 g/cm and a grain size gradient of at most 2.

Fine hollow glass sphere and method for preparing the same

A method for removing an acidic deposit containing a sulfur compound, which comprises contacting the acidic deposit with an aqueous solution of an alkali metal carbonate and/or an alkali metal hydrogencarbonate to remove it.

Method for removing an acidic deposit

A sodium-based dechlorinating agent g is added to a flue gas G6; hydrogen chloride contained in this flue gas is removed as residue of dechlorination; the thus removed residue of dechlorination is dissolved by adding water i; water-insoluble constituents k are separated from the resulting aqueous solution j; and after adjusting pH of the aqueous solution 1 remaining after separation of the water-insoluble constituents k, mercury, dioxin and the like are removed and discharged. The sodium-based dechlorinating agent g is mixed with a hydrophilic anti-caking agent, with an angle of repose of 40&deg; or more, a dispersibility of less than 50, and a floodability index value of less than 90. A mean particle diameter of sodium hydrogencarbonate is set within a range of from 2 &mgr;m to 30 &mgr;m. The hydrophilic anti-caking agent comprises silica, and is contained in an amount of 0.1 mass % or more in the sodium-based dechlorinating agent. Further, a mean particle diameter of the hydrophilic anti-caking agent is set within a range of from 0.001 &mgr;m to 1 &mgr;m. This permits inhibition of occurrence of a pressure drop and leakage in the filter cloth of the dust collector.

A blasting medium which has an average grain size of at most 20 &mgr;m and contains at least 90 mass % of a water-soluble inorganic salt, wherein the content of grains having grain sizes of at least 50 &mgr;m is at most 5 mass %.

Blasting medium and blasting method

A process for producing a spherical silica gel, which comprises supplying a liquid mixture of an alkali silicate solution and an acid solution to a spraying apparatus, spraying the liquid mixture to obtain droplets, bringing the droplets into contact with a liquid for recovering a silica gel, and recovering the formed spherical silica gel together with the liquid for recovering a silica gel, as a slurry.

Process for producing a spherical silica gel

An acid component-removing agent which comprises sodium hydrogencarbonate having a volume-based mean particle diameter of from 1 to 9 &mgr;m as measured by a laser diffraction and scattering method.

Growing community of inventors

Tokyo, Japan

Hachiro Hirano