Sulfite Pulp Mill Acid Plant Mass and Energy Balance : Planning and Execution to Create a Model, 1996 Pulping Conference Proceedings

R. A. Forth

C. C. Head

E. F. Hetzel

K. C. Swanson

Procter & Gamble Paper Prod. Co.

The Procter & Gamble sulfite pulp mill in Mehoopany, Pa. produces 320 TPD of TCF, mixed hardwood pulp for use on-site in its tissue and kitchen towel products. A recent project to reduce Pulpmill off-site odors led to the discovery that the mill sulfur dioxide scrubber does a poor job of handling non-steady state operating conditions. This paper will outline the methods used to conduct a study of the mass and energy balance for the acid making and recovery process. In ™ addition, the use of Aspen as a tool for modeling the process will be discussed. The primary conclusions from this work included the needs to physically verify the ability to obtain field measurements of process data, impacts of weather and operational changes during the data collection, and the importance of minimizing the risks to normal production while obtaining the measurements. Careful preplanning adds to the validity of the modeling and simulation process and the ability to draw succinct conclusions about the outputs of the work. KEYWORDS: sulfite Pulping Acid making, SO2 Recovery Emissions control, Sulfur Dioxide Absorbers, Accumulators, Scrubbers Computer Modeling, Ammo™ Bi-Sulfite, Static vs. Dynamic Simulation, Aspen™