Mitsubishi Rayon Company, Limited

Mitsubishi Chemical Corporation

Hokkaido University

Lucite International UK Limited

Mitsubishi Rayon Engineering Co., Ltd.

Ken Ooyachi

Hiroki Sakakibara

Hiroshi Tasaka

Toshiya Yasukawa

Wataru Ninomiya

Yoshiyuki Himeno

Masaaki Satou

Satoshi Suzuki

Masanori Itakura

Akio Takeda

Shuji Akihara

Tatsuya Suzuki

Kenichi Miyaki

Toshiki Matsui

Masahide Kondo

Katsuya Sanai

Wataru Ueda

Toru Murayama

Disclosed are methods for dehydrating a water containing source of formaldehyde in which water is separated from the water containing source of formaldehyde using a zeolite membrane. In certain aspects, the water containing source of formaldehyde includes a separation enhancer having a relative static permittivity ranging from 2.5 to 20, and the water containing source of formaldehyde may further include methanol. In certain aspects, (meth)acrylic acid alkyl ester may be produced using the dehydrated source of formaldehyde.

Dehydration of water containing source of formaldehyde, and a method for producing an ethylenically unsaturated carboxylic ester

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

Provided are a catalyst whereby isobutylene can be produced at high yield in a lower-temperature environment, and a method for producing isobutylene using the catalyst. The catalyst for producing isobutylene is an oxide including at least one element selected from molybdenum and tungsten, and at least one element selected from tantalum, niobium, and titanium.

Catalyst for producing isobutylene and method for producing isobutylene using the same

A method for efficiently producing t-butanol as a raw material of a methacrylic resin from isobutanol is described, including a step (1) of dehydrating isobutanol to obtain butenes, and a step (2) of hydrating the butenes to obtain t-butanol. A method for producing methacrolein and methacrylic acid is also described, which further includes a step (3) of dehydrating and oxidizing the obtained t-butanol to obtain methacrolein and methacrylic acid. An apparatus for performing the steps (1) to (3) is also described.

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Disclosed is a palladium-containing catalyst which enables to produce an &#x3b1;,&#x3b2;-unsaturated carboxylic acid in high selectivity from an olefin or an &#x3b1;,&#x3b2;-unsaturated aldehyde. Also disclosed are a method for producing such a catalyst and a method for producing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid using such a catalyst. Specifically disclosed is a palladium-containing catalyst containing 0.001 to 0.25 mole of antimony element to 1 mole of palladium element or a palladium-containing catalyst containing palladium element which composes a metal, tellurium element, and bismuth element.

Palladium-containing catalyst, method for producing same, and method for producing &#x3b1;, &#x3b2;-unsaturated carboxylic acid

A carbonate spring producing system includes a gas-liquid separator which is connected on the downstream side of a carbonic acid gas dissolver which connects to a carbonic acid gas supply means and hot water supply. A liquid lead-out pipe is connected to the gas-liquid separator. Preferably an un-dissolved carbonic acid gas lead-out pipe is connected on the upstream sides of the gas-liquid separator and the carbonic acid gas dissolver. The un-dissolved carbonic acid gas lead-out pipe includes a control valve, a compressor, and a liquid level detection means. The control valve controls a flow rate of un-dissolved carbonic acid gas from the gas-liquid separator. An amount of un-dissolved carbonic acid gas in the gas-liquid separator is monitored, so that the un-dissolved carbonic acid gas in the hot water can be separated and removed by the gas-liquid separator. The separated and removed un-dissolved carbonic acid gas can be re-dissolved.

Carbonate spring producing system

Hot water is pumped by a suction pump and introduced into a carbon dioxide (CO) gas dissolver through solution flow rate adjusting means and then poured into a bath. The COis introduced into the COgas dissolver through gas flow rate adjusting means, and the quantity of bubbles in an artificial carbonated spring in a take-out pipe is measured. The solution and gas flow rate adjusting means are controlled via a control device using a relationship expression between a preliminarily set quantity of bubbles and carbon dioxide concentration to obtain a desired concentration of carbon dioxide gas in the carbonated spring. Since the carbon dioxide gas flow control means is provided between the carbon dioxide gas dissolver and a carbon dioxide gas supply source, a high concentration carbonated spring can always be manufactured, even if the pressure of supplied carbon dioxide gas changes or membrane permeation changes.

Device and method for manufacturing carbonated spring and carbonic water, control method for gas density applied thereto and membrane module

The present invention provides: a palladium-containing supported catalyst which is used for producing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid from an olefin or an &#x3b1;,&#x3b2;-unsaturated aldehyde in high selectivity; a method for manufacturing the catalyst; and a method for producing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid in high selectivity. In particular, the present invention resides in a method for manufacturing a palladium-containing supported catalyst for producing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid from an olefin or an &#x3b1;,&#x3b2;-unsaturated aldehyde, comprising the step of reducing palladium oxide contained in a catalyst precursor wherein at least the palladium oxide is supported on a carrier. By using such a palladium-containing supported catalyst, an &#x3b1;,&#x3b2;-unsaturated carboxylic acid is produced through liquid-phase oxidation of an olefin or an &#x3b1;,&#x3b2;-unsaturated aldehyde with molecular oxygen.

Method for manufacturing palladium-containing catalyst

Palladium-containing catalyst, method for producing same, and method for producing &#x3b1;,&#x3b2;-unsaturated carboxylic acid

Disclosed is a palladium-containing catalyst for producing an &#x3b1;, &#x3b2;-unsaturated carboxylic acid from an olefin or an &#x3b1;, &#x3b2;-unsaturated aldehyde in high productivity. Also disclosed are a method for producing such a catalyst, and a method for producing an &#x3b1;, &#x3b2;-unsaturated carboxylic acid in high productivity. Specifically, a palladium-containing catalyst is produced by a method containing a step in which palladium in an oxidation state is reduced by a compound (A) which is represented by the following formula (1). 

Method for producing palladium-containing catalyst

A process for producing carbonated water having a high concentration, inexpensively and easily, involves using a static mixer having 20 to 100 elements so as to provide a value Re&#xd7;N of 100,000 to 2,000,000, in with Re represents a Reynolds number, when a mixture of water and carbonic acid gas flow in the static mixer.

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Hiroshima, Japan

Ken Ooyachi