Production of a powder of polyvinylchloride or a vinylchloride c

Details Production of a powder of polyvinylchloride or a vinylchloride c Production of a powder of polyvinylchloride or a vinylchloride c

1979-03-22

1980-10-21

Yudkoff, Norman

Concentrating evaporators

Spray type

Gaseous current

528501, 159 4J, 159 48R, 159DIG10, B01D 118

Patent

active

042292492

ABSTRACT:
An aqueous dispersion of polyvinylchloride or vinylchloride copolymerizate is spray dried in a flow of drying air in a drying tower which contains at least one two-fluid nozzle for atomizing the aqueous dispersion and an injection member for pressurized air for providing the atomized particles with a rotary motion, about the longitudinal axis of the drying tower. A controlled rotary motion is imparted to the mixture of sprayed particles and the drying air. The heat economy and product quality are improved since it is possible to use a high drying air inlet temperature and to obtain an easily grindable powder suitable for producing stable, low viscosity plastisols.

REFERENCES:
patent: 2636555 (1953-04-01), Klepetko et al.
patent: 2842193 (1958-07-01), Ballestra
patent: 3499476 (1970-03-01), Hartlapp et al.
patent: 3748103 (1973-07-01), Bean et al.
patent: 3883494 (1975-05-01), Winter et al.
patent: 3993536 (1976-11-01), Kalka et al.

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