Kabushiki Kaisha Kobe Seiko Sho

Mitsubishi Kasei Kogyo Kabushiki Kaisha

Idemitsu, Kosan Kabushiki-Kaisha

Nippon Kattan Ekika Kabushiki Kaisha

Aziaseiyu Kabushiki Kaisha

Yutaka Mito

Yukio Nakako

Tetsuo Matsumura

Tomoji Takahashi

Osamu Okuma

Harumasa Tanabe

Yoshiki Sato

Yoshitaka Yamamoto

Kaizaburo Saito

Toshio Ozawa

Shin-ichi Katsushima

Toshiaki Okui

Shin-ichi Oya

Described herein is a process for separating solid indole in refined form with an extremely high degree of purity from a mixture containing more than 50 wt % of indole, in which a pressure of 700-2500 atms is applied to the mixture in a high pressure vessel, and solid-liquid separation is effected continuedly under pressurized state with an initial temperature in the range of 50.degree.-65.degree. C.

Process for separating indole in refined form

A method for the liquefaction of brown coal which comprises effecting primary hydrogenation at a temperature and pressure sufficient to promote the efficient hydrogenation of a slurry prepared by adding an iron-based catalyst and a slurrying solvent to brown coal; distilling all or a portion of the primary hydrogenation product, whereby a naphtha fraction, a middle distillate oil fraction, a heavy distillate oil fraction and a distillation residue are produced; recycling a portion of said middle distillate oil, said heavy distillate oil fraction and said distillation residue to said primary hydrogenation step as the slurrying solvent; removing ash from the remaining portion of the distillation residue, thereby separating the same into an insoluble fraction containing ash, insoluble organic matter or a mixture thereof, and a soluble fraction as a solution in said solvent; and feeding said soluble fraction and said middle and heavy distillate fractions, to a fixed-bed column reactor packed with a molybdenum-based catalyst for secondary hydrogenation at a temperature and pressure sufficient to promote the efficient hydrogenation thereof; and separating the naphtha fraction from the secondary hydrogenation product and recycling all or a portion of the remainder to said primary hydrogenation step as the slurrying solvent therefor.

Method of liquefying brown coal

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Ibaraki, Japan

Yutaka Mito