Freeze-dried Instant Coffee

Freeze-dried coffee is instant coffee made the gentle way. Instead of drying the coffee with hot air, it’s frozen, then the ice is removed under a vacuum, so the coffee never gets hot. That keeps more of its aroma and flavour than spray-dried instant, which is why freeze-dried granules fill the premium jars. It’s also slower and more expensive to make. Here’s how it works.

The short version

• Frozen, at temperatures as low as -40°C, then dried under vacuum.
• The ice turns straight to vapour, without melting.
• More aroma kept than spray-drying, because it stays cold.
• Larger granules, a little slower to dissolve.
• Costs more to make, so it’s used for premium instant.

How is freeze-dried coffee made?

1. Brewing and concentrating. Coffee is brewed at scale and concentrated into an extract, as for any instant.
2. Freezing. The extract is frozen quickly, so that only small ice crystals form, at temperatures as low as -40°C, according to one source.
3. Granulating. The frozen extract is milled into granules, which are sifted to an even size.
4. Vacuum drying. The granules go into a vacuum chamber. A Procter & Gamble patent gives an example: a vacuum of less than 500 microns of mercury, with the coffee kept below about -26°C. Gentle heat then makes the ice sublimate, turning straight from solid to vapour without melting.
5. Packing. What’s left is dry, very porous coffee granules, ready to dissolve.

The first freeze-dried instant coffee was launched by General Foods, under the Maxwell House brand, in 1963, according to Wikipedia. Today Nescafé, for example, uses spray-drying for its Original jar and freeze-drying for its pricier Gold, Tasting Table says.

Why does it taste better than spray-dried?

Because it never gets hot. In spray-drying, hot air drives off some of the coffee’s volatile aromas: the Procter & Gamble patent says only about 50–60% of the aroma added to the extract survives, which is why makers add aroma back afterwards. Freeze-drying removes the water “without significant heating”, the patent says, so it retains more of them. The trade-off is cost: the patent calls freeze-drying more capital intensive and costly to run.

Freeze-dried vs spray-dried

	Freeze-dried	Spray-dried
How	Frozen, then dried under vacuum	Sprayed into hot air
Looks like	Larger, porous granules	Fine powder
Aroma	More retained	Some lost to heat
Dissolves	A little slower	Very fast
Cost	Higher	Lower

How do you make a good cup?

1. Boil the kettle and let it stand a moment.
2. Spoon in the granules, using the amount on the jar.
3. Add a splash of water and stir to dissolve.
4. Top up and add milk or sugar to taste.

A Procter & Gamble patent notes that freeze-dried coffee dissolves less readily than agglomerated spray-dried coffee, especially in hot water, and that the chunks tend to float, so give it a good stir.

General guidance only. Take care with boiling water, and check the jar for caffeine content if you’re watching it.

Freeze-dried vs other methods

• Spray-dried instant: the cheaper, more common instant, and its history.
• Camp Coffee: the liquid coffee and chicory essence.
• Coffee bags: real ground coffee steeped in the cup.
• Canned coffee: coffee ready to drink.

Explore every industrial method in the instant and industrial chapter.