Daicel Chemical Industries, Ltd.

Kuraray Co., Ltd.

Kunio Koga

Akihiro Kuwana

Kimihide Honda

Yukihiro Sasaki

Mutsumi Samejima

Mitsuo Matsumoto

Masuhiko Tamura

Hidetaka Kojima

Hirotoshi Niwa

Masaaki Ichino

Ryoichi Kishimoto

Koji Shima

Shigeru Yamashita

Koichi Kikuchi

Shinichi Miura

Takashi Matsuyama

Tsutomu Mizuta

Disclosed are the improvements of a process for the preparation of a purified 3,4-epoxycyclohexyl methyl (meth)acrylate and 3,4-epoxycyclohexyl methyl (meth)acrylate which is prepared by the improvements, including only minor amounts of polymers having a low molecular weight composed of 3,4-epoxycyclohexyl methyl (meth)acrylate itself. Furthermore, disclosed is a 3,4-epoxycyclohexyl methyl (meth)acrylate composition which has an excellent resistance to coloring, including a specified organic phosphorous compound.

Purified 3,4-epoxycyclohexyl methyl (meth)acrylate, a process for the

Purified 3,4-epoxycyclohexyl (methyl)acrylate, a process for the

Disclosed are the improvements of a process for the preparation of a purified 3,4-epoxycyclohexyl methyl(meth)acrylate and 3,4-epoxyeyclohexyl methyl(meth)acrylate which is prepared by the improvements, including only minor amounts of polymers having a low molecular weight composed of 3,4-epoxycyclohexyl methyl(meth)acrylate itself. Furthermore, disclosed is a 3,4-epoxycyclohexyl methyl(meth)acrylate composition which has an excellent resistance to coloring, including a specified organic phosphorous compound.

Purified 3,4-epoxycyclohexyl methyl(meth)acrylate, a process for the

In a process for the recovery of acetic acid by extracting acetic acid from an aqueous acetic acid solution containing a metallic salt of sulfuric acid with an organic extractant comprising a tertiary amine and an organic diluent and recovering acetic acid from the liquid extract, a mixture of a tertiary amine containing sulfuric acid and an organic diluent is used as an organic extractant so as to suppress energy consumption and to increase extraction efficiency.

Process for the recovery of acetic acid

Acetic anhydride is recovered from a mixture of acetic anhydride, acetic acid and water by contacting the mixture with at least one extraction solvent selected from the group consisting of a hydrophobic, organic solvent, a ketone and an ester to extract and recover acetic anhydride.

Recovery of acetic anhydride

Extraction method

Allyl alcohol is hydroformylated with a gaseous mixture of hydrogen and carbon monoxide, in an aromatic hydrocarbon, in the presence of a rhodium complex and a trisubstituted phosphine, to form hydroxybutyraldehydes which are separated from the reaction mixture within an aqueous medium. The carbon monoxide partial pressure, the rate of consumption of carbon monoxide, the rate at which the carbon monoxide is dissolved in the reaction mixture, reaction temperature and the viscosity of the reaction mixture are selected and controlled in an interrelated way to give a high yield of 4-hydroxybutyraldehyde and reduced catalyst consumption.

Process for continuous hydroformylation of allyl alcohol

Method of operating mixer-settler

Disclosed is a method of recovering acetic acid by extracting from an acetic acid-containing aqueous solution with an organic extracting agent and subjecting the extract to distillation, said method comprising the first step of performing extraction by using a tertiary amine having a boiling point higher than that of acetic acid and being capable of forming a non-aqueus phase as the organic extracting agent in combination with an oxygen-containing, high-boiling-point organic solvent selected from the group consisting of di-isobutylcarbinol, isophorene, methyl benzoate, tributyl phosphate, 3,3,5-trimethylcyclohexanone and 2-ethoxyethyl acetate, the second step of performing dehydration by subjecting the extract to distillation, and the third step of subjecting the dehydrated mixture to distillation in a reduced pressure distillation column at a column bottom temperature of 120.degree. to 170.degree. C. to distill acetic acid and separate it from the organic extracting agent. According to this method, water-free acetic acid can be recovered from an acetic acid-containing aqueous solution at a high separation efficiency with reduced energy consumption, and this recovery method is suitably applied to recovery of acetic acid from acetic acid-containing aqueous solutions discharged from various chemical industrial processes.

Method of recovery of acetic acid

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Himeji, Japan

Kunio Koga