Phospho-ester composition for scale and corrosion inhibition

Claim 1

A PHOSPHO-ESTER SCALE AND CORROSION INHIBITION COMPOSITION FOR ALKALINE-SIDE COOLING WATER TREATMENTS, SAID COMPOSITION BEOING CHARACTERIZED AS HAVING A LOW ORTHO-PHOSPHATE CONTENT AND A HIGH ZINC STABILIZATION, SAID PHOSPHO-ESTER SCALE AND CORROSION INHIBITION COMPOSITION BEING FORMED BY THE FOLLOWING STEPS WHICH COMPRISE: A. HEATING AN ALKANOL AMINE WITH AN ORGANIC MIXTURE TO 75* TO 85*C. WITH MIXING, SAID ORGANIC MIXTURE COMPRISED OF A POLYHYDROXY COMPOUND, EHTYLENE GLYCOL AND A MONOETHER OF ETHYLENE GLYCOL WHEREIN THE RATIO OF ALKANOL AMINE TO ORGANIC MIXTURE IS 60:40 TO 40:60; B. ADDING FROM 150 TO 300 PERCENT BY WEIGHT BASED ON SAID AMINE OF PHOSPHOROUS PENTOXIDE TO THE COMPOSITION FORMED IN STEP (A) OVER A PERIOD OF 4 TO 8 HOURS AND INCREMENTALLY INCREASING THE REACTION TEMPERATURE AT A CONSTANT RATE TO 120*C. OVER SAID TIME PERIOD; C. INCREASING THE TEMPERATURE OF THE COMPOSITION FORMED IN STEP (B) TO 130* TO 140*C. IN 1/2 TO 2 HOURS; D. HEATING THE COMPOSITION FORMED IN STEP (C) AT 140*C. FOR 1 HOUR; E. ADDING A MONO-ETHER OF ETHYLENE GLYCOL TO THE COMPOSITION FORMED IN STEP (D) AND HEATING AT 135* TO 140*C. FOR 1/2 TO 2 HOURS; AND F. FILTERING AND RECOVERING THE PHOSPHO-ESTER PRODUCT.