N-(2-HYDROXYETHYL)-N-BIS (METHYLENEPHOSPHONIC ACID) AND CORRESPONDING N-OXIDE THEREOF FOR HIGH PH SCALE CONTROL

摘要

2811H C-1573 TITLE OF THE INVENTION N-(2-hYDROXYETHYL)-N-BIS(METHYLENEPHOSPHONIC ACID) AND CORRESPONDING N-OXIDE THEREOF FOR HIGH pH SCALE CONTROL N-(2-hydroxyethyl)-N-bis(methylenephosphonic acid) and corresponding N-oxide thereof possess high calcium tolerance and have been found to give excellent inhibition of the formation, deposition and adherence of scale-forming salts, especially calcium carbonate, under severe conditions which include elevated pH, high dissolved solids content, and high saturation levels of calcium carbonate.