Nippon Shokubai Co., Ltd.

Mitsubishi Denki Kabushiki Kaisha

Hajime Matsumoto

Yukihiro Yoneda

Yasuhiro Shingai

Tokumasa Ishida

Takeshi Nishimura

Masatoshi Ueoka

Tetsuya Kajihara

Yukihiro Matsumoto

Sei Nakahara

Yuki Miyamoto

Masahiro Uemura

Fumio Shibusawa

Misao Inada

Yasuhiro Sato

Fumio Munechika

Kazukiyo Arakawa

Hidekazu Mizohara

Hidekazu c/o Tsuda Mizohara

The utilization amount of steam generated by heat recovery tends to decrease in a production process of an organic acid when the concentration of an organic acid solution obtained in a step of collecting an organic acid with a solvent such as water becomes high. The purpose of the invention is to find an advantageous method for effectively utilizing reaction heat and contribute to global environmental preservation and saving product costs. The present invention provides a production method of an organic acid comprising carrying out a gas-phase catalytic oxidation reaction of raw material gas at the temperature from 250&#xb0; C. to 450&#xb0; C., recovering at least a part of reaction heat and/or heat generated in combustion of a waste as high pressure steam at a pressure of 1 MPaG or higher, supplying at least a part of the high pressure steam to a back pressure steam turbine connected with a blower to drive the blower, and supplying at least a part of discharged gas from the back pressure steam turbine, low pressure steam A at a pressure lower than 1 MPaG, to an absorption type refrigerator to utilize the low pressure steam A as a heat source of the absorption type refrigerator.

Method for producing organic acid

The present invention provides a process for producing a (meth)acrylic ester which enables to obtain a (meth)acrylic ester in an excellent reaction yield. The process for producing a (meth)acrylic ester uses an alcohol and an acid as raw materials and an ion-exchange resin as a catalyst, and the process is characterized by comprising a dehydration step and an esterification step, wherein the esterification reaction step follows the dehydration step in which water impregnated in the ion-exchange resin is removed by using as a dehydrating solvent at least one member selected from the group consisting of the alcohol, the acid, and the resulting ester.

Process for producing (meth)acrylic ester

A purifying apparatus characterized by being equipped with a vapor dispersing device possessing in a vapor inlet part owned by the apparatus on the lateral inside thereof an opening part facing downward from the horizontal direction and a horizontal projected cross section area in the range of 10-40% of the cross section area of said apparatus. In consequence of the incorporation of the vapor dispersing device according to this invention, the drift of the gas is repressed, the efficiency of separation is improved, and the possible polymerization of a compound under treatment in the lower part of the column is prevented.

Purifying apparatus possessing vapor dispersing device

When carrying out a liquid-phase reaction by using a heterogeneous catalyst, the separation of the heterogeneous catalyst and the reaction liquid is carried out certainly and effectively. A reaction method involves carrying out a reaction in liquid phase by using a heterogeneous catalyst particle in a reactor , and comprises the steps of: (a) allowing a reaction liquid supplied into the reactor from such as a supplying inlet to react in the presence of the heterogeneous catalyst particle , and (b) passing the resultant reaction liquid containing the heterogeneous catalyst particle through a line screen having an opening width where the heterogeneous catalyst particle is not allowed to pass substantially, and then extracting the reaction liquid separated from the heterogeneous catalyst particle from the reactor by way of such as an extracting outlet

Reaction method by using heterogeneous catalyst and reaction apparatus therefor

The present invention provides: a process can be preventive of a polymerization in a distillation apparatus when distilling a solution containing easily polymerizable substances such as (meth)acrylic acid and (meth)acrylic acid ester. In the distillation process for an easily polymerizable substance-containing solution which includes the step of distilling an easily polymerizable substance-containing solution by a distillation column equipped with a condenser for condensation at a vapor outlet of the distillation column, at least one condenser for polymerization inhibition is further placed in series on a vapor outlet side of the condenser for condensation, and the easily polymerizable substance which is contained in vapor from an upstream condenser is condensed by a downstream condenser.

Distillation process for easily polymerizable substance-containing solution

A semiconductor manufacturing system and method includes an exposure value detector for detecting an exposure value, a pattern size detector for detecting a pattern size, a size comparator for calculating a size difference between the pattern size and a target value, an optimum exposure value calculator for calculating an optimum exposure value based on the exposure value and the size difference, an exposure value controller. In this semiconductor device manufacturing method, the optimum exposure value is calculated based on the exposure value and the size difference, and exposure is performed at the optimum exposure value. A semiconductor device is manufactured by the manufacturing method.

Semiconductor device, manufacturing method thereof and semiconductor manufacturing system

The present invention provides a process for producing a hydroxyalkyl (meth)acrylate which comprises the step of carrying out a reaction between (meth)acrylic acid and an alkylene oxide, wherein the process provides enablement for economically and efficiently recovering and recycling the unreacted residue of the alkylene oxide. The process for producing a hydroxyalkyl (meth)acrylate comprises the steps of, carrying out a reaction between (meth)acrylic acid and an alkylene oxide; stripping the unreacted residue of the alkylene oxide from the resultant reaction liquid; and causing a solvent to absorb the stripped alkylene oxide; wherein: water is used as the absorbing solvent; and an absorbing liquid resultant from the absorption of the unreacted residue of the alkylene oxide is used for production of an alkylene glycol.

Process for producing hydroxyalkyl (meth)acrylate

In a production process for a hydroxyalkyl ester, comprising the step of carrying out a reaction between a carboxylic acid and an alkylene in the presence of a catalyst, the present invention is to provide: a production process which can stop the reaction economically and sufficiently safely. In a production process which comprises the step of carrying out the reaction between a carboxylic acid and an alkylene in a reactor in the presence of a catalyst so as to produce a hydroxyalkyl ester, the reaction is stopped by introducing a reaction terminating liquid into the reactor , wherein the reaction terminating liquid comprises water in a ratio of not less than 50 weight %, and has a low temperature of &minus;5 to 45&deg; C.

Production process for hydroxyalkyl ester

A production process for a hydroxyalkyl(meth)acrylate, which comprises the steps of carrying out a reaction between (meth)acrylic acid and an alkylene oxide and stripping the unreacted residue of the alkylene oxide from the resultant reaction liquid, wherein: (1) the stripping step is performed by use of an inert gas, and the concentration of oxygen in the inert gas is adjusted in the range of 0.1 to 5 mol %; (2) the concentration of the unreacted residue of the (meth)acrylic acid in the resultant reaction liquid is suppressed to not higher than 10 weight %; (3) the difference in operational pressure between the stripping step and the absorption step of causing a solvent to absorb the stripped alkylene oxide is suppressed to not more than 1,000 hPa; (4) the reaction liquid resultant from the reaction is directly supplied to the stripping step without being heated; (5) a part of the liquid left behind in the stripping step is heated and then supplied to the stripping step again; (6) a hydroxyalkyl (meth)acrylate solution is used as the absorbing solvent; (7) a part of the liquid resultant from the absorption step is cooled and then supplied to the absorption step again; or (8) a part or the whole of the absorbing liquid which is on the way of the absorption step is extracted and then cooled and then supplied to the absorption step again.

Production process for hydroxyalkyl(meth)acrylate

The present invention provide a production process for a hydroxyalkyl ester which comprises the step of carrying out a reaction between a carboxylic acid and an alkylene oxide in the presence of a catalyst, wherein the production process sufficiently enhances the conversion or selectivity in the reaction. The production process is characterized in that the reaction is carried out in a reaction liquid under conditions where a relationship a<b is kept throughout the reaction wherein &ldquo;a&rdquo; is a molar concentration (mol %) of the carboxylic acid in the reaction liquid and wherein &ldquo;b&rdquo; is a molar concentration (mol %) of the alkylene oxide in the reaction liquid.

In the purification of an easily polymerizable compound such as (meth)acrylic acid by the use of a purification column adapted to withdraw a liquid from the middle portion of the column, a novel liquid withdrawing tray adapted to prevent the compound from polymerization effectively and permit the purification to be stably performed for a long time, a purification column using this tray, and a method for purifications using this purification column are provided. The liquid withdrawing tray for the purification column is composed of a liquid receiving plate and a liquid withdrawing tube for withdrawing the liquid from the liquid receiving plate.

Liquid withdrawing tray for purification column, purification column, and method for purification

A distillation column is arranged so that a liquid hole which allows liquid containing a polymerizable organic compound to flow from on a tray supporting member downward is formed in a part of the tray supporting member, for example, a support ring, so that substantial retention of the liquid on the tray supporting member is avoided. Therefore, the liquid, such as crude acrylic acid, is allowed to smoothly flow down from on surfaces of a tray and the tray supporting member, thereby causing no substantial retention of the liquid. As a result, polymerization which tends to occur when the liquid is retained on the surfaces of the tray and the tray supporting member thereby being heated is effectively prevented, and the polymerizable organic compound is efficiently purified.

Purifier and purifying method for polymerizable organic compounds

A computer operation management system comprises a computer having a central processing unit, a main memory and, an auxiliary memory, an operating system for operating the computer so as for the computer to execute plural application, programs simultaneously and a process manager for monitoring an execution status of plural application programs to control the number of application programs simultaneously executed and their execution priorities.

Computer operation management system for a computer operating system

An automatic conveying system includes a main loop-like conveying track, a plurality of auxiliary loop-like conveying tracks along the main conveying track for selective coupling and de-coupling by couplers to and from the main track, and a plurality of auxiliary conveying vehicles for running along the main and auxiliary tracks. Each conveying vehicle can run continuously along the main and auxiliary tracks with switching by the couplers. The system permits reduction or elimination of intermediate loading and unloading operations or waiting times for changing vehicles, thus increasing the efficiency of conveyance. In addition, such equipment as stockers or loading and unloading machines for tentatively stocking cargo for changing vehicles and for loading and unloading operations during conveyance can be reduced or eliminated, thus minimizing the installation space for such equipment. This permits effective utilization of factory premises and good layout of the factory with a high space utilization-factor.

Automatic conveyance system

An automatic carrier system provided with first carrier units for carrying an object between two adjacent regions, a second carrier unit for carrying the object between two remote regions, and a transfer unit for transferring the object between the first carrier units and the second carrier unit, so that the object is carried between two optional regions of the plurality of regions and an automatic carrying method using this system. When an object is to be carried between the remote regions, it is detected whether or not the first carrier unit at the region to which the object is carried is usable, so that, only when it is usable, the second carrier unit is used to carry the object.

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Himeji, Japan

Hajime Matsumoto