Concentrating evaporators – Spray type – Gaseous current
Patent
1974-10-10
1976-11-09
Sofer, Jack
Concentrating evaporators
Spray type
Gaseous current
159 16R, 159DIG10, 202236, B01D 116, B01D 114, B01D 308
Patent
active
039909387
ABSTRACT:
This disclosure is for a solvent flashing process for recovering polymer from dilute solution in discrete, uniform granules substantially free of solvent. The process comprises pressurizing a dilute solution of a polymer dissolved in a solvent, preferably at an elevated temperature, spraying the solution through a first fluid atomizing outlet of a two fluid nozzle, and forcing a hot gas through at least one outlet port of the two fluid nozzle directed so as to intersect with the polymer solution emerging from the nozzle. The solution is atomized into fine droplets from which the bulk of the solvent flashes by both passage through the atomizing nozzle and by a shearing of the solution by the hot gas leaving finely divided granules of polymer which are collected in water. The process is characterized by the use of the two fluid nozzle and by the passage of the hot gas through the nozzle which causes further atomizing of the polymer solution with more efficient heat transfer from the gas to the polymer solution. In a preferred embodiment of this invention, the nozzle is maintained below the surface of the water, the polymer solution is a polyphenylene ether solution, preferably a poly-(2,6-diphenyl-1,4-phenylene) ether in benzene, and the hot gas is steam.
REFERENCES:
patent: 1324866 (1919-12-01), Wilcox
patent: 2592814 (1952-04-01), Ludlow
patent: 2959561 (1960-11-01), Kelley
patent: 3004719 (1961-10-01), Pouppirt, Jr.
patent: 3168131 (1965-02-01), Gross
General Electric Company
Mufatti William F.
Papuga Donald M.
Sofer Jack
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