Mitsubishi Rayon Company, Limited

Mitsubishi Chemical Corporation

Akio Takeda

Wataru Ninomiya

Ken Ooyachi

Toshiya Yasukawa

Tatsuya Suzuki

Kenichi Miyaki

Seiichi Kawato

Yuji Fujimori

Shuji Akihara

Motomu Oh-Kita

Yoshiyuki Himeno

Yuji Mikami

Mai Kojima

Provided are: a catalyst for dehydration, with which isobutylene is able to be produced with high conversion and high selectivity through a dehydration reaction of isobutanol; and a method for producing isobutylene. This catalyst has a BET specific surface area within the range of from 210 m/g to 350 m/g (inclusive) as calculated from Nadsorption/desorption isotherms. It is preferable that this catalyst is formed of at least one substance selected from among alumina, silica alumina, zeolite, and solid phosphoric acid. It is more preferable that this catalyst contains alumina, and it is especially preferable that this catalyst is formed of alumina. In this method for producing isobutylene, the isobutanol concentration in the starting material gas is preferably 20% by volume or more, more preferably 40% by volume or more, and especially preferably 60% by volume or more. In addition, the temperature of a catalyst layer is preferably from 230&#xb0; C. to 370&#xb0; C. (inclusive), and more preferably from 240&#xb0; C. to 360&#xb0; C. (inclusive).

Catalyst for isobutylene production and method for producing isobutylene

The purpose of the present invention is to provide a method that can produce, with high yield or high selectivity isobutylene by means of isobutanol dehydration-reaction. An isobutylene production method of a first embodiment of the present invention is a method for producing isobutylene by means of isobutanol dehydration-reaction, wherein isobutanol is reacted using a catalyst for which the BET specific surface area is within the range of 60 m/g-175 m/g, and the reaction is carried out under a reaction pressure of 50 kPa-750 kPa as the absolute pressure. An isobutylene production method of a second embodiment of the present invention includes: using a catalyst which is filled into a reaction chamber and for which the particle diameters of at least 90 mass % of the catalyst are within the range of 700 &#x3bc;m-1000 &#x3bc;m; setting the isobutanol concentration within a supplied reaction gas to 30 vol %-85 vol %; setting the weight hourly velocity (WHSV) of the isobutanol to 0.175 h&#x2dc;20 h; and reacting isobutanol under a reaction pressure of 50 kPa-750 kPa as the absolute pressure.

Method for producing isobutylene from isobutanol

Provided is a method for producing isobutylene with a high selectivity by a dehydration reaction of isobutanol. There are provided a method for producing isobutylene by dehydration of isobutanol, in which the dehydration of isobutanol is performed in a state where at least one of an organic acid and an organic acid ester is present in a reaction system, and methods for producing methacrylic acid and methyl methacrylate from the obtained isobutylene.

Method for producing isobutylene, method for producing methacrylic acid, and method for producing methyl methacrylate

Disclosed is a method for producing at least one of an &#x3b1;,&#x3b2;-unsaturated aldehyde and an &#x3b1;,&#x3b2;-unsaturated carboxylic acid from an alcohol in a liquid phase through a simple process. Namely, at least one of an &#x3b1;,&#x3b2;-unsaturated aldehyde and an &#x3b1;,&#x3b2;-unsaturated carboxylic acid is produced by dehydrating and oxidizing an alcohol in a liquid phase at 110 to 250&#xb0; C. in the presence of molecular oxygen and a noble metal-containing catalyst. Alternatively, at least one of an &#x3b1;,&#x3b2;-unsaturated aldehyde and an &#x3b1;,&#x3b2;-unsaturated carboxylic acid is produced by dehydrating and oxidizing an alcohol in a liquid phase in the presence of molecular oxygen, a noble metal-containing catalyst, and an acidic substance.

Method for producing at least one of &#x3b1;, &#x3b2;-unsaturated aldehyde and &#x3b1;, &#x3b2;-unsaturated carboxylic acid

The object of the present invention is to provide a catalyst which can produce an &#x3b1;,&#x3b2;-unsaturated carboxylic acid through liquid-phase oxidation of an olefin or an &#x3b1;,&#x3b2;-unsaturated aldehyde in good reaction performance, a method for producing the catalyst, and a method for producing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid by using the catalyst. The present invention resides in a catalyst for producing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid, wherein a metal is supported on a carrier with a total pore volume of 0.40 to 1.50 cc/g as measured by nitrogen gas adsorption method, or wherein palladium with an average particle diameter in the range of 1 to 8 nm is supported on the carrier.

Catalyst for producing &#x3b1;,&#x3b2;-unsaturated carboxylic acid and method for preparation thereof, and method for producing &#x3b1;,&#x3b2;-unsaturated carboxylic acid

The object of the present invention is to provide a method for producing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid in higher selectivity. The present invention resides in a method for producing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid from an olefin or an &#x3b1;,&#x3b2;-unsaturated aldehyde in liquid phase by using a noble metal-containing catalyst and by causing a compound (A) having an acid dissociation exponent (pKa) of less than 4 to be present in the liquid phase.

Process for producing &#x3b1;,&#x3b2;-unsaturated carboxylic acid

A catalyst for the production of carboxylic acid esters for use in reacting an aldehyde with an alcohol in a liquid phase in the presence of molecular oxygen, comprising calcium carbonate and palladium, bismuth and at least one element selected from the group consisting of barium, iron, zinc and germanium, these elements being supported on said calcium carbonate.

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Otake, Japan

Akio Takeda