Nippon Shokubai Co., Ltd.

Hideyuki Baba

Hideaki Tsuneki

Toshio Hayashi

Hiroshi Yoshida

Eiichi Shiraishi

Noboru Saito

Satoshi Nakagawa

Atusi Moriya

Tomohisa Ohata

Masanori Nonoguchi

Yukihiko Kakimoto

Kazuo Tsuchitani

Ritsuo Kitada

Takahiro Inagaki

Satoru Miura

Kohei Umehara

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

A method of producing a diol derivative efficiently and to high purity is provided. Specifically, the present invention relates to a method of producing a diol derivative having, as a fundamental step, a step of obtaining an &#x3b1;-hydroxycarboxylic acid ester by reacting (i) one or more 1,2-diols or (ii) a 1,2-diol and a primary alcohol as starting material(s) with oxygen in the presence of a catalyst comprising metal loaded on a carrier.

Method for producing diol derivatives

The invention provides a process for producing dialkanolamines through amination of alkylene oxide with ammonia at liquid phase, in which side formation of trialkanolamines is inhibited and dialkanolamines can be produced with high selectivity and high efficiency. Said process is carried out in the presence of a catalyst which possesses such reaction characteristics that render the rate constant &agr; of the reaction between ammonia and alkylene oxide not less than 0.10, when the reaction rate constant between monoalkanolamine and alkylene oxide is 1, and the rate constant &bgr; of the reaction between dialkanolamine and alkylene oxide not more than 0.7, when the reaction rate constant between monoalkanolamine and alkylene oxide is 1.

Process for producing dialkanolamines

Method of purifying glyoxylic esters and distillation equipment for

An exhaust gas purifying catalyst for simultaneous removal of carbon monoxide, hydrocarbons and nitrogen oxides from an exhaust gas from an internal-combustion engine, having carried on a monolithic carrier a mixture comprising a catalytically active component comprising 0.5 to 30 g of palladium, 0.1 to 50 l g of an alkaine earth metal oxide, 10 go 150 g of cerium oxide, and 0.1 to 50 g of zirconium oxide and 10 to 300 g of an activated alumina.

Catalyst for purifying automotive exhaust gas

Growing community of inventors

Osaka, Japan

Hideyuki Baba