On-line acid monitor and neutralizer feed control of the overhea

Mineral oils: apparatus – Vaporizing – Automatic control

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202160, 203 3, 210 961, 210101, 210143, 364501, 422 62, 422 75, 422 76, 436 51, B01D 342

Patent

active

053022530

ABSTRACT:
A method and apparatus for automatically measuring the acidity of overhead water in an oil refinery, and dispensing a neutralizing agent into the refinery system at a rate responsive to that measurement. A sample of overhead water is collected and passed through a filter and cation exchange resin. The acid concentration of the sample is then automatically measured and a signal generated based on the concentration. The signal goes to a controller which controls the dispensation rate of neutralizing agent into the refinery system, thus reducing the acidity of the overhead water and limiting the corrosive effects of such acidity.

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J. Gutzeit, et al., Corrosion in Petroleum Refining and Petrochemical Operations (Metal handbook ninth edition, vol. 13, Corrosion), 1987 pp. 1262-1287.
Richmond & Browne, Automatic pH Control of Crude Column Overhead Streams Sponsored by the Nat. Assoc. of Corrosion Engineers, Mar. 22-26, 1982, Paper No. 102.
Bieber, Ferguson, Scattergood & Nalco Chemical Co., New Methods to Measure Corrosive Conditions Inside Crude Distillation Towers, Presented at the Nat. Assoc. of Corrosion Engineers, Apr. 23-27, 1990.

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