Mitsui Chemicals, Inc.

Kuraray Co., Ltd.

Kazuo Wakimura

Shoji Obuchi

Hideaki Nakamura

Kenji Fujiwara

Rensuke Ikarashi

Junji Tan

Takeshi Isobe

Yoshihiro Sezaki

Susumu Yoshinaga

Hiroshi Kato

Shin-ichi Tadokoro

Koji Fujita

Tadaharu Hase

Resin composition and use thereof

A process for producing refined methacrylic acid comprising the steps of oxidizing methacrolein and the like catalytically in a vapor phase to form a methacrylic acid-containing gas, cooling and condensing the gas to an aqueous methacrylic acid solution, adding to the solution an organic solvent that forms two liquid phases with water to carry out an extraction operation and thereby to obtain an extract, bringing the extract into contact with water to mix them together, separating the mixture into an organic phase and a water phase, and distilling the organic phase. According to this process, highly refined methacrylic acid containing little dibasic acids such as maleic acid and citraconic acid can be obtained economically and without increasing wastes that are unrecoverable to the process.

Process for refining methacrylic acid

A process for preparation of nitrous oxide, wherein ammonia is reacted with oxygen in the presence of steam using a copper-manganese oxide catalyst having diffraction angles measured by X-ray diffraction analysis of about 36.degree., about 58.degree. and about 64.degree.; a copper-manganese oxide catalyst suitable for the process. The catalyst is highly active and selective, has a long catalyst-lifetime, gives a non-condensable gas comprising nitrogen, oxygen and nitrous oxide which contains nitrous oxide in a high concentration, and is less deteriorative. The catalyst can be used in a process for preparation of nitrous oxide in which formation of NOx as by-products is reduced; and a process for stably recovering nitrous oxide.

Process for preparation of nitrous oxide

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Osaka-fu, Japan

Kazuo Wakimura