A professional who controls equipment that dissolves and precipitates chemicals used in manufacturing chemical products, such as butadiene and styrene. Respnsibilities include:

• Pumps chemical solutions through premeasuring tanks, dissolver tanks, and precipitator tanks, observes thermometers, and turns valves to maintain temperature in tanks within specified limits to dissolve and precipitate solutions.
• Starts tank agitator to mix solution for prescribed time.
• Titrates sample of solution and inserts hydrometer to determine acidity and specific gravity of product.
• Observes flowmeters and turns valves to regulate flow of ingredients through tanks to alter concentration and produce product meeting specified standard.
• Pumps or drains remaining solutions from precipitate and turns valves to transfer product for further processing, shipment, or storage.
• When controlling precipitator tanks only, may be designated Precipitator Operator.
• When dumping caustic soda cake into dissolving tanks and controlling tanks to produce solution of specified concentration, may be designated bottom-liquor attendant.