Nippon Kayaku Kabushiki Kaisha

Arkema France

Ryota Hiraoka

Tomoyuki Kawamura

Kimito Okumura

Motohiko Sugiyama

Shogo Yasuda

Yumi Hino

Hiroki Motomura

Jean-Luc Dubois

Tatsuhiko Kurakami

Kazuo Shiraishi

Yuuta Nakazawa

Yoshiko Shoya

Takanori Nakano

Yasushi Kobayashi

Masaki Nakahara

Eiji Nishimura

Provided is a method for producing an unsaturated aldehyde including subjecting an alkene to partial oxidation using a fixed bed multi-tube reactor to produce the corresponding unsaturated aldehyde, in which n catalyst layers (n is 2 or more) in a gas flow direction in a reaction tube are provided, when a filling length of the catalyst layers from a first catalyst layer to an (n−1)th catalyst layer from a gas inlet side of the reaction tube is L, and a filling length of an nth catalyst layer from the gas inlet side of the reaction tube is Ln, a relationship between L and Ln satisfies the following equation (1): and

Method for producing unsaturated aldehyde

Provided is a method for producing at least one of an unsaturated aldehyde and an unsaturated carboxylic acid from an alkene by an oxidation reaction, in which a n-layered catalyst layer (n&#x2265;2) is provided in a gas flow direction in a reaction tube, two or more kinds of catalysts having different activities are used; and the catalysts are packed in such a manner that dT&#x2264;20&#xb0; C. is satisfied, when a difference between a temperature PTof an exothermic peak in a n-th layer as counted from a gas inlet and a minimum value mTof a temperature of a catalyst layer which appears between an exothermic peak in a (n-1)th layer and an exothermic peak in a n-th layer from the gas inlet is represented as dT (=PT&#x2212;mT), and the change rate of dT is 2.5 or less at a reaction bath temperature within a range of &#xb1;6&#xb0; C. of a reaction bath temperature at which the highest yield is obtained.

Method for producing at least one of unsaturated aldehyde and unsaturated carboxylic acid and catalyst for producing at least one of unsaturated aldehyde and unsaturated carboxylic acid

Provided is a catalyst for manufacturing an unsaturated aldehyde and/or an unsaturated carboxylic acid, which is prepared by a method in which a molybdenum component raw material is composed of only an ammonium molybdate, the weight of water for dissolution is 8.5 times or less relative to the weight of molybdenum contained in the ammonium molybdate; and a bismuth component raw material is composed of only bismuth nitrate, the weight of a nitric acid aqueous solution for dissolution is 2.3 times or more relative to the weight of bismuth contained in the bismuth nitrate, and a nitric acid concentration in the nitric acid aqueous solution for dissolving the bismuth nitrate is 10% by weight or more.

Catalyst for manufacturing unsaturated aldehyde and/or unsaturated carboxylic acid and manufacturing method of same, and manufacturing method of unsaturated aldehyde and/or unsaturated carboxylic acid

The present invention relates to the production of acrolein, acrylic acid or methacrylic acid by dehydration reaction of renewable raw material such as glycerin or hydroxycarboxylic acids, in the presence of a novel catalyst system supported on a carrier having a bimodal structure and a high pore volume and distribution. The dehydration reactions can be carried out for longer operation duration, so that acrolein, acrylic acid or methacrylic acid can be produced at higher productivity and for longer running time.

Process of dehydration reactions

Provided is a catalyst having high activity and yield of a target product for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid and further having high mechanical strength. The catalyst is a catalyst prepared by a method in which a catalyst formulation satisfies specified atomic ratios; and in the preparation thereof, a molybdenum component raw material is an ammonium molybdate, a solvent for dissolving the ammonium molybdate is water, a bismuth component raw material is bismuth nitrate, and a solvent for dissolving bismuth nitrate is a nitric acid aqueous solution, and the weight of water for dissolving the ammonium molybdate, the weight of the nitric acid aqueous solution for dissolving the bismuth nitrate, and the acid concentration of the nitric acid aqueous solution are satisfied with specified ranges, respectively.

Catalyst for producing unsaturated aldehyde and/or unsaturated carboxylic acid, method for producing same, and method for producing unsaturated aldehyde and/or unsaturated carboxylic acid

A catalyst for producing butadiene using n-butene as a raw material, a process for producing the same and a process for producing butadiene using the catalyst are provided, and specifically, a catalyst for producing butadiene by gas-phase contact oxidative dehydrogenation of n-butene, which is capable of stably producing butadiene in a high yield from the beginning of the reaction, a process for producing the same and a process for producing butadiene, in which the catalyst is a shaped catalyst containing a complex metal oxide having molybdenum as an essential ingredient, wherein the pore volume of macropores is 80% or more, more preferably 90% or more, based on the total pore volume, are provided.

Catalyst for production of butadiene, process for producing the catalyst, and process for producing butadiene using the catalyst

There is provided a process for producing a shaped catalyst for a fixed bed oxidation reaction or a fixed bed oxidative dehydrogenation reaction, the catalyst having both of sufficient mechanical strength and catalyst performance, and the catalyst is produced by supporting a catalyst powder containing a complex metal oxide having molybdenum as an essential ingredient on an inert support by a tumbling granulation method at a relative centrifugal force of 1 to 35 G.

Process for producing shaped catalyst and process for producing diene or unsaturated aldehyde and/or unsaturated carboxylic acid using the shaped catalyst

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Yamaguchi, Japan

Ryota Hiraoka