Low molecular weight hydrolyzed polyacrylamide used as a scale i

Details Low molecular weight hydrolyzed polyacrylamide used as a scale i Low molecular weight hydrolyzed polyacrylamide used as a scale i

1976-12-14

1978-04-18

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

252180, C02B 506

Patent

active

040850455

ABSTRACT:
A process for inhibiting scale formation using a low molecular weight hydrolyzed polyacrylamide prepared by a process involving simultaneously and continuously charging separate streams of acrylamide monomer, ammonium persulfate (as catalyst) and mercaptoalkanoic acid (as chain transfer agent) to a reaction zone containing water under reflux, the rate of charging being such that the heat of polymerization is sufficient to maintain reflux in the reaction zone without exceeding the capacity of the condenser to remove the heat of reaction, and then reacting the polymer product with sufficient aqueous caustic to hydrolyze from about 60 to 90% of the amide groups in the polymer product.

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patent: 3380947 (1968-04-01), Galgoczi
patent: 3463730 (1969-08-01), Booth et al.
patent: 3589998 (1971-06-01), Rice et al.
patent: 3756257 (1973-09-01), Rice et al.
patent: 3846390 (1974-11-01), Ito et al.
patent: 4008164 (1977-02-01), Watson et al.
Bovey et al., Emulsion Polymerization, Interscience, N.Y., 1955, pp. 278 & 279.

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