Continuous method for producing a dry, solid polyacrylamide

Details Continuous method for producing a dry, solid polyacrylamide Continuous method for producing a dry, solid polyacrylamide

1975-09-05

1977-06-28

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526229, 526303, C08F 200, C08F12000, C08F12056

Patent

active

040327019

ABSTRACT:
A process for producing polyacrylamide in a dry and solid form which includes the steps of mixing from 20 to 40% by weight of water and from 60 to 80% by weight of acrylamide to form an aqueous mixture thereof; heating said aqueous mixture to a temperature of between about 50.degree. C and 100.degree. C to form one phase aqueous liquid composition; depositing, on a surface, said one phase aqueous liquid composition and a catalytically effective amount of an aqueous solution of a water soluble polymerization catalyst for the acrylamide, said depositing being done in such a manner so as to form a mixture of said one phase aqueous liquid and said catalytic aqueous solution, said surface being heated to a temperature of between about 50.degree. C and the charring point of polyacrylamide, whereby the acrylamide exothermically polymerizes to form polyacrylamide whereby all the water is evaporated and there is formed a dry, solid polyacrylamide and, after said water has evaporated, removing the polyacrylamide from said surface and, if desired, grinding the polyacrylamide to the desired particle size. It is preferred if the surface is moving at a rate of speed such that the polyacrylamide is brought to the removal point after the water is removed therefrom. In the more preferred exemplary embodiment, the moving surface is in the form of a relatively flat disc moving in a circular manner and is heated by gas burners.

REFERENCES:
patent: 2983717 (1961-05-01), Henley et al.
patent: 3042970 (1962-07-01), Terenzi
patent: 3242152 (1966-03-01), Goren
patent: 3663518 (1972-05-01), Patzelt et al.
patent: 3732193 (1973-05-01), Svarz
patent: 3755280 (1973-08-01), Saunders
patent: 3820957 (1974-06-01), Mihalev et al.

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