Mitsubishi Jukogyo Kabushiki Kaisha

Michio Oshima

Susumu Okino

Atsushi Tatani

Naohiko Ukawa

Naoharu Shinoda

Hiroshi Makihara

Toshiro Okamoto

Naoyuki Takahashi

Yoshihiko Kamimura

Sadaichi Shigeta

A thermal cracking method for producing olefins from hydrocarbons which comprises the steps of mixing said hydrocarbons with a mixed gas of methane and hydrogen in a methane/hydrogen mol ratio of 0.2 or more; prior to reaction carrying out a thermal cracking reaction under conditions such that the total concentration of methane and hydrogen is at least 40 mol % or more at the outlet of a reactor, the partial pressure of said hydrogen is 3 bars or more, the temperature at the outlet of the reactor is from 800.degree. to 1200.degree. C., and the residence time in the reactor is from 5 to 300 milliseconds; and quenching the reaction product discharged through the outlet of the reactor.

Thermal cracking method for producing olefins from hydrocarbons

A process for desulfurizing an exhaust gas which comprises desulfurizing an exhaust gas containing SO.sub.2 by bringing it into contact with a slurry containing calcium compounds and aluminum compounds, characterized in that the concentration of the dissolved aluminum ion in said slurry is detected and a manganese compound is supplied into said slurry in such a manner that the ratio of the concentration of manganese (including both solid and liquid) to said concentration of the dissolved aluminum ion may be maintained in a molar ratio of less than 1 in said slurry.

Process for desulfurizing an exhaust gas

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Hiroshima, Japan

Michio Oshima