Method of and device for isolation of rubber-like polymers from

Details Method of and device for isolation of rubber-like polymers from Method of and device for isolation of rubber-like polymers from

1973-08-07

1976-01-20

Sofer, Jack

Concentrating evaporators

Gaseous blast or current

159 18, 159 47, B01D 114, B01D 126, B01D 100, C07D21100

Patent

active

039335747

ABSTRACT:
A method of isolating rubber-like polymers from hydrocarbon solutions comprises at least three steps of steaming and a device for realization of this method in which the hydrocarbon solution is delivered into the upper section of the vertical column of the device, which is the first steaming step at which the temperature is maintained within the range from 80.degree. to 180.degree.C. At the first steaming step, the hydrocarbon solution is processed by steam which is delivered into the sections of the device through the steam intake. During this process the main bulk of the solvent is evaporated and the polymer is isolated in the form of granules. The solvent vapor, together with steam, are delivered to the condensation step. The isolated granules of the polymer are mixed with water to prepare an aqueous suspension by mechanical stirring means which are provided in each separate section of the column. The suspension is continually delivered along the means for the passage of the suspension into the lower sections of the column, which are the next steps of the steaming process. At these steps the suspension is also treated with steam, mixed, and the vapors are withdrawn. The temperature at all subsequent steps of the steaming process, (except the last step, which is accomplished in the lower section) is maintained in the range from 115.degree. to 180.degree.C. The lower section is provided with a means for decreasing pressure of the aqueous suspension delivered into it from the previous section. Owing to this fact, the temperature at the last step of the steaming process also decreases and is maintained in the range from 90.degree. to 110.degree.C. Vapors that are formed in the lower section (as the pressure decreases) are withdrawn from it through a connection located in the upper part of the section. The suspension is withdrawn from the lower section, the polymer granules are separated from water, and finally dried.

REFERENCES:
patent: 2300985 (1942-11-01), Smith
patent: 3076795 (1963-02-01), Hall
patent: 3190868 (1965-06-01), Mitacek et al.
patent: 3357900 (1967-12-01), Snell
patent: 3421567 (1969-01-01), Hoppe
patent: 3772262 (1973-11-01), Clementi

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