A professional who tends batch stills to separate, by distillation, liquids having divergent volatilization temperatures. Respnsibilities include:

• Pours specified types and quantities of materials into still.
• Observes thermostat and sets controls on instrument panel to maintain specified volatilization temperatures throughout distillation cycle and to control condensation of components.
• Draws samples of distilled liquids for laboratory analysis or performs refractometric or other tests, using standard procedure and equipment.
• Observes color of distillate to determine when distillate is completed.
• Records operating data, such as weight, yield of products, gauge readings, and number of batches distilled.
• May tend continuous-flow vacuum still.
• May be designated according to product distilled or formed as Ammonia-Still Operator; Crystallizer Operator II; Degreasing-Solution Reclaimer; Glycerin Operator.