Nippon Shokubai Co., Ltd.

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Dai-ichi Kogyo Seiyaku Co., Ltd.

Ritsuo Kitada

Michio Ueshima

Isao Nagai

Yoshiyuki Takahashi

Hiroshi Yoshida

Mitsuo Kushino

Hideaki Tsuneki

Michiyuki Kono

Toshio Hayashi

Manabu Kikuta

Satoshi Nakagawa

Taketo Toba

Fumihide Tamura

Yukihiko Kakimoto

Hideyuki Baba

Kazuhiro Anan

Kazuhiko Murata

Takahiro Inagaki

Hiroshi Tanaka

Kohei Umehara

Takao Yokohashi

Takao Nishihata

Masaki Tezuka

To efficiently dry it, a nonionic alkylene oxide-type water-soluble resin is put into a container, then the container is degassed to a prescribed vacuum degree which is maintained while a dry gas having a dew point not higher than prescribed is introduced into the container at a rate not lower than prescribed. Minor volatiles are efficiently removed from the resin in an evaporation tank having a stirring blade. For protecting the dried resin from water, a dry gas is introduced into and air is purged from an empty packaging container whereafter the resin is charged into the container is sealed. By controlling solvent content and visocity of the resin and loading it into a temperature-controlled transportation container and/or unloading it out of the transportation container by the use of a pump, good subsquent processability of the resin and prevention of deterioration thereof are ensured.

Method for drying nonionic alkylene oxide-type water-soluble resin, method for packaging it, and method for transporting it

The present invention provides a process for more efficiently producing an &#x3b1;-hydroxycarboxylic acid ester wherein side reactions due to the &#x3b1;-hydroxycarboxylic acid ester are inhibited or prevented in comparison with prior art production processes. The invention provides a process for producing an &#x3b1;-hydroxycarboxylic acid ester comprising Steps 1 to 3: Step 1. reacting, in the presence of oxygen, (i) a 1,2-diol with a 1,2-diol or (ii) a 1,2-diol with an alcohol to obtain a reaction product containing an &#x3b1;-hydroxycarboxylic acid ester; Step 2. separating the &#x3b1;-hydroxycarboxylic acid ester from the reaction product obtained in Step 1 by distillation under reduced pressure; and Step 3. feeding Step 1 with a mixture obtained by partially or entirely removing water from the reaction product, wherein the mixture contains an unreacted 1,2-diol and/or alcohol.

Method for producing &#x3b1;-hydroxycarboxylate

The present invention provides a polymerizable monomer composition particle and a resin particle, both of which display a narrow particle diameter distribution. A process for producing a resin particle comprises the steps of: passing two liquids through a static type in-line mixer having a liquid-dividing mechanism standing in a static state, wherein the two liquids are formable into two phases including one of the two liquids as a dispersing phase component and the other as a continuous phase component; then passing the two liquids through a high speed shearing type dispersing machine having a liquid-shearing mechanism which revolves at a high speed, thus dispersing a fine liquid drop of the dispersing phase component into the continuous phase component; and forming a resin particle from the resultant liquid drop.

Production process, production apparatus, and product of resin particle

A catalyst for the vapor-phase oxidation of an unsaturated hydrocarbon, alcohol, saturated aliphatic aldehyde or unsaturated aliphatic aldehyde having 4 carbon atoms, said catalyst comprising a molybdovanadophosphoric acid having X-ray diffraction lines (Cu-K.sub..alpha. radiation) at 2.theta.=about 26.2.degree., about 10.5.degree., about 21.3.degree. and about 30.3.degree. and a crystal structure approximating that of its salt, and said catalyst having the composition represented by the general formula

Process for preparation of methacrylic acid

Oxidation catalyst

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Takatsuki, Japan

Ritsuo Kitada