Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1996-02-29
1999-01-05
Drodge, Joseph W.
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
137 3, 137 5, 137 88, 137 93, 210 961, 210143, 2101981, 210739, 364500, 364502, 422 7, 422111, C02F 500, G05D 2100
Patent
active
058557911
ABSTRACT:
A method for detecting and controlling cooling system characteristics. A flow rate of make-up cooling medium is measured. A conductivity of the make-up cooling medium is measured. A conductivity of a recirculating cooling medium is measured. A treatment material feed rate is determined based upon the formula: ##EQU1## where X is a treatment feed rate of a treatment compound, .OMEGA. is a desired concentration of the treatment compound, and K is a constant. A corrosion rate of the recirculating cooling medium is measured. A desired corrosion rate of the recirculating cooling medium is determined. A feed rate of a corrosion inhibitor is calculated according to the following formula:
where .alpha. is a cascade factor that varies in a step-wise manner depending upon the value of CORR.sub.MEASURED /CORR.sub.SETPOINT and has a value between about 0.1 and about 8.0. A corrosion inhibitor is then fed at the corrosion inhibitor feed rate.
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Haaland John
Hays George
Ashland Chemical Company
Drodge Joseph W.
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