A professional who controls machines that combine ingredients, such as sodium silicate, sulfuric acid, water, and caustic soda to make catalysts used in manufacture of high-octane gasolines. Respnsibilities include:

• Dumps dry ingredients into electric mixing vats and turns valves to admit prescribed amounts of liquid ingredients.
• Observes thermometers and flowmeters, and adjusts gauges to control temperature and amount of flow.
• Turns valves to allow mixture to flow from mixing vats to vacuum filters to remove excess water.
• Controls pumps that force mixture through spray-dryers where particles of catalyst are formed, and turns dials on control panel to regulate temperature and speed of spray.
• Controls pumping of catalyst particles from bottom of dryers to washer-filters for removal of cation and anion impurities.
• Turns valves to regulate flow of catalyst through hot-air steam dryers and observes temperature and speed of flow to ensure specified drying.
• May draw off samples of mixture for analysis.
• May keep records of batches processed.