Mitsubishi Chemical Corporation

Tomoe Engineering Co., Ltd.

Takayuki Isogai

Atsushi Onodera

Koji Fujimoto

Jun Ohashi

Yoshiaki Izumisawa

Motoki Numata

Katsunori Fukuda

Yoshiyuki Sumi

A screen bowl type centrifugal separator which can not only eliminate the problem of the productivity being lowered resulting from the occurrence of clogging with the crystals in the screen part, but also minimize the amount of leakage of the object to be treated in the screen part. Inside of the hub () of the screw conveyor (), a cleaning liquid receiving part () which receives the cleaning liquid for the cleaning nozzle () is provided, and further, in the cleaning liquid receiving part (), a residual layer crystal cleaning liquid receiving part () which receives the cleaning liquid for cleaning the residual layer object to be treated in the screen part () is provided, being partitioned independently of the inside of the cleaning liquid receiving part (). The cleaning liquid which has been supplied to the inside of the residual layer crystal cleaning liquid receiving part () is jet spouted directly toward the residual layer object to be treated from the outer circumferential edge of the flight () through the residual layer crystal cleaning liquid path provided along the direction of the helix of the flight (), with no relation to said cleaning liquid receiving part ().

Centrifugal machine

A process for preparing an aqueous slurry of terephthalic acid, which comprises oxidizing p-xylene with molecular oxygen in a liquid phase in an acetic acid solvent in the presence of a catalyst, to obtain an acetic acid slurry of terephthalic acid, separating terephthalic acid crystals from the acetic acid slurry, washing the terephthalic acid crystals containing acetic acid, with p-xylene or an acetic acid ester, and then mixing water thereto.

Process for preparing an aqueous slurry of terephthalic acid

Growing community of inventors

Fukuoka, Japan

Takayuki Isogai