How to Evaporate Coffee Into a Powder

Written by michael mcgrath
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How to Evaporate Coffee Into a Powder
Instant coffee takes seconds to make, but long hours to manufacture. (Jupiterimages/Creatas/Getty Images)

Japanese American Scientist Satori Kato invented instant coffee back in the early 1900s, and the first mass-produced instant coffee company did business in England by 1909. By 1938, Nescafe invented freeze-drying technology and instant coffee became a staple convenience food. (See reference 2). Transforming water and coffee grounds into instant powder requires large industrial spray or freeze-drying facilities.

Skill level:
Challenging

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Things you need

  • Coffee
  • Extraction cells
  • A spray drying tower
  • An industrial freeze drying facility

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Instructions

    Manufacturing Instant Coffee

  1. 1

    Make large amounts of coffee using extraction cells, large industrial machines that mix ground coffee and water. Extraction cells work much like percolating coffee machines, only on a much larger scale.

  2. 2

    Pump coffee into a tall tower for spray drying. Liquid coffee sprays through hot air, causing water to evaporate. The coffee residue that remains settles at the bottom of the tower as a fine powder. Adding hot water reconstitutes the coffee. Spray drying coffee results in a loss of flavour.

  3. 3

    Retain more coffee flavour by freeze drying coffee. Freeze thin layers of liquid coffee to --40 Fahrenheit. Break the frozen layer of coffee into small pieces and place in a vacuum. The airless environment lowers the boiling point of water so far that the water boils off, leaving a powder used for better quality instant coffees.

Tips and warnings

  • Both freeze-drying and spray-drying coffee results in loss of flavour. Some instant coffee mixes make up for this loss by adding other flavours.
  • Mass production of instant coffee requires training and large-scale industrial equipment unavailable to most people.

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