Mitsubishi Chemical Industries Limited

Yoshio Kinsho

Akio Tamaru

Koichi Takami

Shingo Abe

Toshinori Tsutsumi

Yukio Takigawa

Takayuki Yoshida

There is disclosed a process for preparing cyclohexanone by catalytic dehydrogenation of cyclohexanol, which comprises conducting the dehydrogenation in the presence of a copper-chromium catalyst derived from a mixture of copper oxide and chromium oxide having an atomic ratio of copper to chromium between 8:2 and 2:8, said mixture being subjected to heat treatment at a temperature of 650.degree. to 900.degree. C. in a non-reducing atmosphere and to subsequent reduction to provide the desired catalyst.

Process for the preparation of cyclohexanone

A compressed exhaust gas containing nitrogen oxides discharged from a compressed absorption type nitric acid plant is treated by adding ammonia or an ammonia precursor to the gas and passing the gas through a NO.sub.x removing catalytic layer to an exhaust gas turbine wherein the temperature of the main flow of the exhaust gas in the zone from the point of which ammonia or an ammonia precursor is added to the outlet of the exhaust gas turbine is maintained at a temperature higher than T.degree. K = 10.sup.3 / (1.91 - 0.228 log P) [P : a sum of partial pressures of ammonia and nitrogen oxides (atm.)] and feeding an inert gas into the place of the zone in which the exhaust gas stagnates.

Method of treating exhaust gas discharged from nitric acid plant

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Kitakyushu, Japan

Yoshio Kinsho