A professional who tends equipment that filters acid liquor from slurry and dehydrates residual materials for further processing. Respnsibilities include:

• Opens feed valves and starts rotary drum that filters liquor from slurry.
• Turns valves to transfer residue to dehydration unit.
• Adjusts controls to regulate temperature, pressure, and speed of material flow as specified to dry residue.
• Collects samples of acid liquor and residual materials for laboratory analysis.
• May be designated according to material processed as phthalic-acid purifier.