Nippon Shokubai Kagaku Kogyo Co., Ltd.

Nippon Shokubai Kagaku Kogyo

Toshihiko Kumazawa

Masashi Mitsuhata

Takeshi Yamamoto

Fumio Watanabe

Hiroshi Odanaka

Isamu Kiguchi

Kenji Aida

Minoru Saotome

Takahiko Nakai

Shin-ichi Nagase

An apparatus for mixing a hydrocarbon-containing gas flow with a molecular oxygen-containing gas flow, wherein at least one aqueous medium sealing zone allowing the hydrocarbon-containing gas flow to pass therethrough is provided by sealing a side of said introduced gas flow with an aqueous medium, providing at least one shielding zone for flame propagration, said gas flow is allowed to pass therethrough on a discharge side of said gas flow, and providing means for introducing the molecular oxygen-containing gas flow into a gas mixing zone defined between both of the above zones there to be thoroughly mixed with the hydrocarbon-containing gas flow.

Apparatus for mixing gases

In a method for the manufacture of a silver catalyst having silver deposited on a porous inorganic carrier in conjunction with at least one reaction accelerator selected from the group consisting of alkali metals and thallium to be used for the production of ethylene oxide, the improvement comprising the steps of depositing silver on the porous inorganic carrier in conjunction with at least one reaction accelerator selected from the group consisting of alkali metals and thallium thereby preparing an activated silver catalyst and subsequently subjecting said silver catalyst to a high-temperature treatment at a temperature in the range of 550.degree. to 950.degree. C. in an inert gaseous atmosphere having an oxygen concentration of not more than 3 volume percent in the final step.

Method for manufacture of silver catalyst for production of ethylene

A process for the production of ethylene oxide by the vapor-phase catalytic oxidation of ethylene with molecular oxygen, which process comprises passing a mixed gas containing ethylene and molecular oxygen through a catalyst bed filled with a silver catalyst and subsequently passing the resultant reaction product gas through a cooling zone filled with a particulate material containing a substance capable of inhibiting the isomerization of ethylene oxide to acetaldehyde carrying at least one metal selected from the group consisting of sodium, potassium, rubidium, cesium, calcium, strontium, barium and thallium or a compound of said metal to be carried on an inert refractory particulate material.

Process for production of ethylene oxide

A silver catalyst for the production of ethylene oxide, comprising a granular .alpha.-alumina carrier having a sodium content of not more than 0.07% by weight and a specific surface area within the range of from 0.5 to 5 m.sup.2 /g, a finely divided metallic silver deposited on said carrier in an amount within the range of from 5 to 25% by weight based on the total catalyst, and at least one member selected from the group consisting of alkali metals of Atomic Numbers 19 to 55 and alkali metal compounds said at least one member being in an amount within the range of from 0.001 to 0.05 gram equivalent weight per kilogram of the complete catalyst.

Silver catalyst for production of ethylene oxide

A process for the production of alkylene glycols, which comprises causing a corresponding alkylene carbonate to react with water in the presence of a catalyst of at least one member selected from the group consisting of molybdenum and tungsten.

Process for the production of alkylene glycols

A process for the production of alkylene glycols, which comprises causing a corresponding alkylene oxide to react with water in the presence of a catalyst of at least one member selected from the group consisting of molybdenum and tungsten.

A method for mixing a hydrocarbon-containing gas flow with a molecular oxygen-containing gas flow, wherein at least one aqueous medium sealing zone allowing the hydrocarbon-containing gas flow to pass therethrough is provided by sealing a side of introducing said gas flow with an aqueous medium and at least one shielding zone for flame propagation allowing said gas flow to pass therethrough is provided on a side of discharging said gas flow, and the molecular oxygen-containing gas flow is introduced in a gas mixing zone defined between both of the above zones to be thoroughly mixed with the hydrocarbon-containing gas flow.

Method for mixing gases and apparatus used therefor

An improved process for preparing a silver-supported catalyst for use in the production of ethylene oxide by catalytic vapor phase oxidation of ethylene with molecular oxygen, which comprises impregnating a porous inorganic carrier with a solution of a silver compound containing a reducing compound, subjecting the impregnated product to a reducing treatment at 50.degree. to 200.degree. C. to disperse and deposit metallic silver on the external surface of the carrier and the internal surfaces of its pores, washing the silver-supported carrier with water, a lower alcohol or both, drying the washed product at a temperature of 50.degree. to 150.degree. C., impregnating the dried product with a solution containing a promoter, and evaporating the liquid ingredients.

Process for preparing silver-supported catalyst for the production of

A process for preparing ethylene oxide by the catalytic vapor phase oxidation of ethylene with molecular oxygen in the presence of a catalytic composition whose constituent metallic elements and atomic ratio are represented by the general formula

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Yokohama, Japan

Toshihiko Kumazawa