Mitsui Toatsu Chemicals, Incorporated

Tadatoshi Honda

Kazuhiro Terada

Makoto Kotani

Shiro Asano

Shinji Kiyono

Takeshi Tsuda

Fujio Matsuda

Kiyotaka Yoshimura

Hiroshi Itoh

Akihide Kudoh

Takazo Kato

Kazunori Kawahara

Jun Kitagawa

Masami Murakami

Takatoshi Mitsuishi

Jun Saitoh

Nobuhiko Horiuchi

Tadamitsu Kiyoura

Hiroshi Kato

Yasuo Kogure

Masao Hashimoto

Yoshihiko Kambara

Kohei Shizuka

Yoichi Hosono

Toshimi Nakagawa

Sinji Tokunoh

Tokio Nagayama

Takashi Jimbo

Nobuyoshi Hashimoto

Junji Mikami

Tomoyuki Ueno

Hirofumi Io

Ryozi Tsuchiya

Ryoji Tsuchiya

Kenzo Fujii

A method for preparing an unsaturated compound mainly comprising monoolefins, or a mixture of .alpha., .beta.-unsaturated nitriles and monoolefins comprises coming a mixed gas which comprises paraffins and oxygen, or paraffins, oxygen and ammonia in contact with a catalyst which comprises (1) an oxide of phosphorus and (2) at least one oxide selected from the group consisting of indium oxide and tin oxide or comprises, in addition to the foregoing catalytic components, (3) at least one oxide selected from the group consisting of vanadium oxide, tungsten oxide and molybdenum oxide. The method makes it possible to prepare monoolefins, or a mixture of .alpha., .beta.-unsaturated nitriles and monoolefins in high yield and high selectivity from cheap starting materials, parafins.

Method for preparing unsaturated compounds

A composite oxide catalyst represented by the general formula: Mo-V-P-X-Y (wherein X represents at least one element selected from the group consisting of Sb, Cu, Co, Bi and As; Y represents at least one element selected from the group consisting of K, Rb, Cs and Tl) and a method for preparing methacrylic acid through gas phase catalytic oxidation of methacrolein with molecular oxygen in the presence of the foregoing catalyst are herein disclosed. The catalyst exhibits excellent catalytic activity, selectivity to methacrylic acid, catalytic stability and lifetime.

Catalyst for oxidizing methacrolein and method for preparing methacrylic

A process is provided for the preparation of an indole from aniline or a derivative thereof and a polyhydric alcohol. The reaction is carried out in the presence of a catalyst composed of a carrier having a specific surface area of at least 10 m.sup.2 /g and silver supported on the carrier. The catalyst also contains as an additional component a specific amount of at least one element selected from Co, Fe and Ni. Deterioration in catalytic performance of the catalyst during the reaction and its regeneration are therefore minimized.

Preparation process of indoles

A method for preparing acrolein or methacrolein comprises subjecting propylene, secondary propanol, isobutylene or tertiary butanol to gas phase catalytic oxidation with molecular oxygen in the presence of a catalyst represented by the following general formula (I):

Method for preparing acrolein or methacrolein

A method for preparing an .alpha.,.beta.-unsaturated nitrile comprises bringing an .alpha.-oxycarboxylic acid amide represented by the following general formula: ##STR1## wherein R' and R' each represents a hydrogen atom or an alkyl group, with the proviso that at least one of R' and R' represents an alkyl group, into contact with a solid acid catalyst with heating in the presence of water in a molar ratio of not more than 15 with respect to the .alpha.-oxycarboxylic acid amide. The method makes it possible to directly produce an .alpha.,.beta.-unsaturated nitrile at high yield and high selectivity utilizing an .alpha.-oxycarboxylic acid amide as a starting material, which can easily be obtained from an .alpha.-oxynitrile.

Method for preparing .alpha.,.beta.-unsaturated nitriles

Disclosed herein is to react an aniline and an ethylene glycol at a superatmospheric pressure in preparing an indole by subjecting the aniline and ethylene glycol to a gas-phase catalytic reaction in the presence of a catalyst, thereby improving the selectivity of the reaction and the service life of the catalyst.

Preparation process for indoles

Disclosed herein is a preparation process for an indole, which process comprises subjecting an N-(.beta.-hydroxy)-alkylaniline, in the presence of a catalyst and at a super-atmospheric pressure, to a gas-phase catalytic reaction. The present process improves the selectivity of the reaction and the service life of the catalyst.

Preparation of indoles by cyclization

In a process for preparing an indole by reacting an aniline with a diol, a catalyst the activity of which has been reduced through its use in the reaction is brought into contact with an inert gas containing 5 vol. % or less of oxygen so that the catalyst is regenerated for its repeated utilization. The activity of the regenerated catalyst is enhanced further when it is subjected to a reducing treatment for activation upon its reutilization.

Preparation process indoles

Magnetic powder protected from subsequent oxidation and deterioration can be obtained by effecting contact of starting magnetic powder, which is formed of an intermetallic compound containing a rare-earth metal and an iron-group metal as principal components thereof, with a phosphorus compound containing at least one active proton having a pKa of 4 or smaller and exposure of the starting magnetic powder to an oxygen-containing atmosphere in an arbitrary order or simultaneously. Production of a plastic magnet with the magnetic powder of this invention allows to avoid danger and deterioration in magnetic characteristics of the resulting product due to oxidation of the magnetic powder even if exposed to elevated temperatures during its production or use.

Magnetic powder and production process thereof

A process for preparing alkyl nitroacetates by reacting an alkyl phenyl carbonate with a nitroparaffin in a polar aprotic solvent in the presence of a cyanide ion. The process permits a higher reaction rate, and thus the reaction can be completed even at room temperature.

Process for preparing alkyl nitroacetates

A process for the preparation of indoles which comprises reacting aniline or a derivative thereof with a 1,2-glycol in the presence of a catalyst comprising silver supported on a carrier having a specific surface area of not less than 10 m.sup.2 /g.

Process for the preparation of indoles

Preparation process of indole

A process for the preparation of indole and derivatives thereof wherein an aniline is reacted with a 1,2-glycol in the vapor phase, the liquid phase or a mixed vapor-liquid phase. A salt of a metal of group IIa of the periodic table, a salt of iron, a salt of cobalt and/or a salt of nickel are used as the catalyst for this reaction. The present invention makes it possible to prepare indole and derivatives thereof in a single step by using inexpensive compounds as the starting materials.

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Kanagawa, Japan

Tadatoshi Honda