Anionic polymers containing N-vinyl-pyrrolidone or other vinyl a

Details Anionic polymers containing N-vinyl-pyrrolidone or other vinyl a Anionic polymers containing N-vinyl-pyrrolidone or other vinyl a

1988-09-29

1990-04-03

Hruskoci, Peter

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

252180, 422 16, C02F 512

Patent

active

049138243

ABSTRACT:
A method of inhibiting scale, generally and specifically and preferably calcium phosphate and calcium carbonate scale, which is found on metal surfaces in contact with industrial cooling waters, boiler waters, oil well drilling waters, and evaporated sea water, which comprises treating the water present in such systems with a few ppm of a water-soluble anionic co- or terpolymer of N-vinyl-2-pyrrolidone (NVP) or vinyl amide. The preferred anionic comonomers are either acrylic or methacrylic acid.

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"Mineql, A Computer Program for the Calculation of Chemical Equilibrium Composition of Aqueous Systems", Water Quality Laboratory, by J. C. Westall, et al, Ralph M. Parsons Laboratory for Water Resources & Environmental Engineering, Dept. of Civil Engineering, Mass. Institute of Technology, Technical Note No:18, sponsored by EPA Grant No:R-803738, Jul. 1976, pp. 8-10.

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