A PROCESS SIMULATOR FOR PH CONTROL STUDIES

A dynamic simulator for pH control studies is offered. The process inf luent is composed of Various mono- and di-valent acids, bases and comm on ion salts and is treated with a multi-component reagent (either aci dic or basic). Mixing is in a nonideal continuous flow stirred tank. D ynamic behavior includes: sensor lag; measurement noise; and autoregre ssive drifts on influent composition, flowrate and sensor calibration. Idealizations in the model were intentionally chosen to balance compu tational effort with output accuracy. The program output is shown to d uplicate a wide range of pH results and to be sufficiently accurate fo r use as a dynamic process simulator for process control studies.