Ube Industries, Inc.

Japan Ultra-High Temperature Materials Research Center

Terumi Hisayuki

Sumio Umemura

Kyoji Ohdan

Kenichi Suzuki

Kiyohito Okamura

Takemi Yamamura

Yasuo Bando

Narihito Nakagawa

Hironaga Iguchi

Yoshikazu Matsumura

Motohide Toda

A method for improving thermal efficiency of a heating device that reduces an amount of heat flowing out from a heating deviceto the outside by installing a heat-resistant inorganic conjugated molded productin and along a pathwayfor heated gas generated from the heating devicewithout interrupting the flow of heated gas passing the pathway, heating the inorganic conjugated molded productwith the heated gas, and putting radiation heat from the heated inorganic conjugated molded productback into the heating device, the inorganic conjugated molded productbeing provided with an interior layer and an exterior layer, the exterior layer consisting of a coverture for inorganic materials that protects the interior layer from heated gas.

Method and apparatus for improving thermal efficiency of heating device

Methacrolein is produced in a high yield by catalytically oxidizing isobutylene at a temperature of from 250.degree. to 500.degree. C. by using a catalyst represented by the formula:

Process for producing methacrolein

Isobutylene is catalytically oxidized in the vapor phase with molecular oxygen to form methacrolein. The catalyst used consists essentially of metal oxides and is represented by the formula:

Catalytic oxidation of isobutylene

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Ube, Japan

Terumi Hisayuki