Mitsubishi Chemical Corporation

Mitsubishi Rayon Company, Limited

Shuhei Otsuka

Hideyasu Takezawa

Junichi Morioka

Akio Munetou

A vertical centrifugal thin film evaporator is equipped with: a cylindrical body in which an central axis of a circle is set in a vertical direction; a rotor that rotates an interior of the cylindrical body in a circumferential direction thereof; a wiper that slides on an inner circumferential surface of the cylindrical body; a fixing support that fixes the wiper and is mounted on the rotor; and a heater that heats a circumferential surface of the cylindrical body. A liquid-withdrawing structure that communicates between a space surrounded by the wiper and the fixing support and a space outside the wiper and the fixing support is formed on at least one of the wiper and the fixing support, thereby preventing a liquid to be processed from being retained between the wiper and the fixing support.

Vertical centrifugal thin film evaporator and monomer purification method

A process for producing methyl methacrylate, which comprises subjecting methacrolein and methanol to direct esterification reaction to thereby obtain a reaction mixture liquid containing at least methyl methacrylate and methanol, adding additional methacrolein to the reaction mixture liquid as an entrainer, and distilling the resulting reaction mixture liquid to recover the methanol.

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Otake, Japan

Shuhei Otsuka