NEW INHIBITOR REDUCES CRUDE-UNIT CORROSION PROBLEMS AT LOWER pH

Eddie C. French Petrolite Corp. St. Louis The crude-unit overhead at a commercial refinery operated for more than 1 year at Ph levels of about 5.0-5.5 with very low corrosion. About 20% of this time, the pH was less than 5.0. During this period, a water-soluble inhibitor was added to this large recirculated water wash. The low corrosion rates observed during the test period indicate that, in contrast to conventional wisdom, the inhibitor is effective at pH levels less than 5.0.

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