Low molecular weight hydrolyzed polyacrylamide used as a scale i

Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow

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252180, C02B 506

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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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Bovey et al., Emulsion Polymerization, Interscience, N.Y., 1955, pp. 278 & 279.

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