How Instant Coffee Is Made – Spray Drying vs Freeze Drying

If you’ve ever wondered how your cup of instant coffee goes from bean to sachet, the answer isn’t simple — and it’s definitely not just ground coffee in disguise. The journey from coffee cherry to instant drink involves a complex series of steps, each critical to creating a product that dissolves easily while (ideally) retaining some of coffee’s original flavour.

In short: powder-style instant coffee is made through spray drying, where concentrated brewed coffee is turned into powder by spraying and rapidly evaporating moisture. Granular or crystal-style instant coffee uses freeze drying — the coffee extract is frozen, broken into pieces, then placed in a vacuum to remove water as vapour. Both processes start the same: selecting beans, roasting, grinding, and brewing concentrated coffee.

What Is Instant Coffee, Really?

Instant coffee is a soluble form of brewed coffee that dissolves quickly in hot water. It comes in two main physical forms: powder and granules. Powdered instant coffee is usually produced by spray drying, while granulated or crystallised instant coffee typically results from freeze drying. Despite being far removed from freshly brewed coffee in taste and aroma, instant coffee offers unmatched convenience.

How Powdered Instant Coffee Is Made (Spray Drying)

The production of powdered instant coffee begins with selecting and roasting suitable coffee beans. After roasting, the beans are ground, then brewed using hot water to extract a concentrated coffee liquor — a dark, intense brew with most of the coffee solids dissolved. This extraction step is similar to making espresso or filter coffee, but scaled up and aimed purely at extracting solubles.

The extracted coffee liquid is then passed from one tank to another for further concentration. Once a high enough concentration is achieved, the thick coffee solution is sprayed through nozzles into a large chamber with extremely hot air. As the tiny droplets fall, the water evaporates almost instantly due to the high temperature and airflow. What remains are tiny, dry particles of coffee — essentially powdered instant coffee. This is the spray drying method, and it’s how most powdered instant coffee is produced.

How Granular Instant Coffee Is Made (Freeze Drying)

Granular or crystal-style instant coffee follows a completely different preservation method: freeze drying. In this process, concentrated coffee extract is first rapidly frozen — the speed of freezing is crucial to preserving aromatic compounds. Once frozen solid, the coffee mass is broken down into small chunks or flakes. These frozen pieces are then placed in a vacuum chamber and slowly heated. Because the chamber is under vacuum, the ice inside the coffee doesn’t melt — instead, it sublimates, turning directly from solid ice into water vapour. A vacuum pump removes the vapour, leaving behind dry, porous granules of coffee. These granules rehydrate quickly in water, maintaining a more coffee-like structure than spray-dried powder. This is the freeze drying method, used for most granulated instant coffee products.

From Bean to Extract: Key Steps Before Drying

Before either drying method can occur, several crucial steps take place:

• Coffee Selection: Coffee cherries typically contain two beans each. Only specific beans are chosen based on desired flavour profiles.
• Roasting: The selected beans are roasted to develop aroma and flavour. Roasting degree impacts the final taste of the instant coffee.
• Grinding: The roasted beans are ground to prepare them for extraction.
• Extraction: Ground coffee is brewed using hot water — often in a percolation or filtration setup similar to commercial brewers — to create a concentrated coffee liquor. This step is essential for pulling out the soluble solids that will become the base of the instant product.

Once the concentrated extract is obtained, it is further processed (either concentrated further or adjusted) before moving to the drying stage. Each of these stages affects the final flavour, solubility, and body of the resulting instant coffee.

Frequently Asked Questions

What’s the difference between spray-dried and freeze-dried instant coffee?

Spray-dried instant coffee is made by spraying concentrated coffee extract into a chamber of hot air, which instantly evaporates the water, leaving behind fine coffee powder. Freeze-dried instant coffee involves freezing the coffee extract quickly, breaking it into pieces, and then removing the ice in a vacuum by sublimation (directly turning ice into vapour), leaving behind porous granules. Freeze-dried coffee generally retains more aroma and has a better mouthfeel.

Why do some instant coffees come as powder and others as crystals?

Powdered instant coffee is usually the result of spray drying, which produces fine, free-flowing particles. Crystalline or granular instant coffee comes from freeze drying, where the frozen coffee sublimates in a vacuum, forming larger, porous granules that often resemble small crystals. The method determines the physical form.

Does instant coffee go through the same roasting process as regular coffee?

Yes, the coffee beans used to make instant coffee are roasted in the same way as beans for brewed coffee. Roasting develops the flavours and aromas, though the final instant product may still lose some nuance during extraction and drying.

What happens during the coffee extraction step?

Ground coffee is combined with hot water to extract soluble compounds — including acids, sugars, oils, and caffeine. This creates a concentrated coffee liquor, which is the base material for both spray-dried and freeze-dried instant coffee. The efficiency of this step greatly affects the final taste.

Is freeze-dried coffee better than spray-dried?

Many coffee experts consider freeze-dried instant coffee to have superior flavour and aroma retention compared to spray-dried coffee, thanks to the gentler preservation method. However, spray-dried coffee is cheaper to produce and more common in mass-market products.

How many beans are in a single coffee cherry?

Each coffee cherry typically contains two coffee beans. These are what are harvested, processed, roasted, and eventually extracted to make both regular and instant coffee.

Recommended FrontStreet Beans for Home Brewing

For coffee lovers curious about the origins of their daily brew, try FrontStreet Coffee’s Ethiopia Humbera — bright and juicy with citrus and floral notes — or Yirgacheffe, known for its lemony acidity and stone fruit sweetness. Both highlight the qualities lost in instant coffee but cherished by specialty drinkers. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.