Decaf Coffee, Explained: How It’s Made
Decaf coffee has a reputation problem.
For years, it’s been seen as a lesser version of “real” coffee: thinner, flatter, or missing something essential. But that perception comes from how decaf was historically made, not what it has become today.
In reality, great decaf starts the same way all great coffee does: with careful sourcing and thoughtful processing. The difference is what happens next.
What is Decaffeination, really?
Decaf doesn’t mean caffeine-free.
Most decaf coffee still contains a small amount of caffeine, typically 2–5 mg per cup, compared to 80–100 mg in regular coffee.
☕ Did You Know?
"Decaf" is not the same everywhere.
- In the United States, decaffeinated coffee must be at least 97% caffeine-free
- In the European Union, the standard is stricter: about 99.9% caffeine-free
How Coffee Is Decaffeinated
Caffeine is one of many compounds inside a coffee bean. The challenge is removing it without stripping away the compounds that create aroma, sweetness, and complexity.
Decaffeination happens before coffee reaches the roastery, as a green bean. We work with trusted partners who specialize in this process, selecting coffees based on how well they retain their character after decaffeination.
There are three main methods used today; each approaches that balance differently.
1. Swiss Water Process (Water + Filtration + Rebalancing)
One of the most widely used methods in specialty coffee is the Swiss Water Process. This method uses only water, temperature, and filtration... no added solvents.
Here’s how it works:
- Green coffee beans are soaked in hot water, which dissolves both caffeine and soluble flavor compounds. These beans are discarded.
- That water is passed through a carbon filter that removes only caffeine molecules.
- What remains is a solution rich in the coffee’s original flavor compounds (called Green Coffee Extract).
- New beans are then introduced into this Green Coffee Extract. Because the extract is already saturated with flavor compounds, it doesn’t pull those out again; instead, it mainly draws out caffeine.
What this means in the cup:
A clean, balanced profile that can retain much of the coffee’s original structure especially when starting with high-quality beans.
2. Ethyl Acetate (EA) Process (“Sugarcane Decaf”)
This is the method used for our current decaf. Ethyl acetate is a naturally occurring compound found in fruits and often derived from sugarcane.
The process:
- Green beans are gently steamed to open their structure.
- They are rinsed with ethyl acetate, which selectively binds to caffeine molecules.
- The caffeine is removed, and the green beans are carefully dried.
Ethyl acetate has a strong affinity for caffeine and can extract it while leaving many of the coffee’s aromatic compounds intact. When thoughtfully applied, it allows the coffee’s natural sweetness and body to remain present.
What this means in the cup:
A round, expressive coffee with noticeable sweetness and body often closer to the experience of the underlying coffee.
3. CO₂ Process (Pressure + Precision)
This method uses pressurized carbon dioxide to extract caffeine.
The process:
- Green beans are placed in a sealed chamber.
- Liquid CO₂ is applied under high pressure.
- CO₂ selectively dissolves caffeine molecules and removes them.
This method is highly controlled and efficient, especially at scale.
What this means in the cup:
Clean and consistent, though sometimes less expressive depending on the starting coffee.
Why Some Decaf Tastes Flat
Not all decaf is created equal.
If a coffee starts with lower-quality beans, or if too many soluble compounds are removed during processing, the result can taste muted or hollow. Unfortunately, that’s where decaf earned its poor reputation.
But when care is taken (both in sourcing and processing) decaf can retain depth, sweetness, and clarity.
What We Look for in Decaf
At Katï Coffee, we approach decaf the same way we approach every coffee:
- Start with great coffee → quality in, quality out
- Choose the right process → one that preserves structure and flavor
- Roast for balance → sweetness, clarity, and a satisfying finish
Because decaf shouldn’t feel like a compromise.
It should stand on its own.
Decaf should be flavorful without jitters... perfect for that late afternoon cup or the slow evening ritual.
We’ve been working on a decaf that reflects everything we care about: balance, sweetness, and clarity. If you’ve written off decaf before, this might be worth revisiting.
