Agitating – Rubber or heavy plastic working
Patent
1993-05-19
1994-02-01
Jenkins, Robert W.
Agitating
Rubber or heavy plastic working
366266, 4253823, B01F 1502
Patent
active
052826805
ABSTRACT:
An apparatus for continuous polymerization of vinyl chloride or a vinyl chloride-based monomeric mixture, comprising a pre-mixer 1 for preparing an aqueous suspension of the vinyl chloride or vinyl chloride-based monomeric mixture, and a polymer slurry tank 5 connected to the pre-mixer 1 through a polymerization passage comprising a piping 3, wherein a pump comprising a conical hub and an impeller mounted thereon comprised of a single spiral blade is used for drawing out the aqueous suspension from the pre-mixer into the polymerization passage and for discharging a polymer slurry formed in the passage into the slurry tank, and the polymerization passage has a length sufficient for permitting the vinyl chloride or vinyl chloride-based monomeric mixture contained in the aqueous suspension flowing through the passage to be polymerized to a predetermined extent while passing through the passage. The use of the pump having the structure as above ensures a marked suppression of polymer scale deposition in the pump, heat exchanger and pipings, and makes it possible to produce a resin with few fish-eyes. The apparatus is of extremely high industrial value for carrying out continuous polymerization.
REFERENCES:
patent: 3771900 (1973-11-01), Baehr
patent: 3827888 (1974-08-01), Terwilleger
patent: 4080096 (1978-03-01), Dawson
patent: 5174651 (1992-12-01), Gaddis
Amano Tadashi
Kitamura Hajime
Ohnishi Shuji
Shigemitsu Minoru
Takahashi Yasuhiro
Jenkins Robert W.
Shin-Etsu Chemical Co. , Ltd.
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