A professional who tends ball mill and auxiliary equipment to produce sodium salicylate for use in production of salicylic acid. Respnsibilities include:

• Opens valves to transfer specified quantities of sodium hydroxide and phenol solutions to tank, and starts agitators to mix solutions to form mixture of sodium phenate and water.
• Drains mixture into ball mill (closed metal tank), opens exhaust valve, and starts heaters to evaporate water from sodium phenate.
• Observes moisture indicators to determine when water has been removed from sodium phenate.
• Pumps cold water into jacket of ball mill to contract mill walls sufficiently to loosen pulpy sodium phenate.
• Heats ball mill to specified temperature, increases pressure in ball mill to required level, and pumps carbon dioxide into ball mill to change sodium phenate to sodium salicylate.
• Opens vents to rid sodium salicylate of excess carbon dioxide.
• Pumps specified quantity of water into ball mill to dissolve sodium salicylate, and pumps sodium salicylate solution into tanks for further processing into salicylic acid.