Process for controlling the pH value of an acid scrubbing liquid

Details Process for controlling the pH value of an acid scrubbing liquid Process for controlling the pH value of an acid scrubbing liquid

1992-05-15

1993-09-21

Silverman, Stanley S.

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

55227, 55228, 95 9, 95187, C02F 166

Patent

active

052465942

ABSTRACT:
The acid scrubbing liquid which has a pH value below 3 and is used in a scrubbing zone to remove acid components from a gas. At least part of the scrubbing liquid is circulated. A partial stream of the scrubbing liquid at a constant rate is mixed with an alkaline solution stream which has a constant concentration and is supplied at a constant volume rate, the pH value of the resulting mixture is continually measured, a setpoint in the range from 5 to 9 is selected for the pH value of the mixture, and a neutral or alkaline correcting liquid is added to the scrubbing liquid in response to a decrease of the measured pH value below said setpoint. The scrubbing liquid may mainly consist of water.

REFERENCES:
patent: 4329649 (1982-05-01), Scoates
patent: 4416855 (1983-11-01), Abrams et al.
patent: 4590048 (1986-05-01), Spitz
patent: 4762796 (1988-08-01), Weber
patent: 4774071 (1988-09-01), Gaines et al.

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