Decaffeinated Coffee (Decaf)
Is there a place for decaffeinated coffee in the world of “real” coffee? Dried fruits, dried red fruits and berries, wild rose or cascara, compote, honey-like notes, nuts and raisins, chocolate and citrus, baked goods — this isn’t the full list, but all of these flavor characteristics (descriptors) can apply to decaf coffee as well.
First, let’s clarify what “decaf” is.
Decaf, or decaffeinated coffee, is coffee from which caffeine has been removed at certain stages before roasting. Decaffeination is the process of removing caffeine from coffee beans, cocoa, tea leaves, and other caffeine-containing materials. Decaffeinated products are usually labeled “decaf”. Decaf beverages typically contain 1–2% of the original caffeine content, though sometimes even up to 20%.
Let’s take a look at coffee decaffeination methods.
The Swiss Water Process is a natural method of removing caffeine from coffee beans without using chemical solvents. It helps preserve the coffee’s natural aroma and flavor, making the process as eco-friendly as possible. Look for labels such as: "Swiss Water Process", "Decaffeinated using the Swiss Water Method". The main steps of this method are as follows:
- Soaking the beans: Green (unroasted) coffee beans are soaked in hot water for 8–10 hours. This allows caffeine and other soluble components, such as essential oils and aromatics, to be released into the water.
- Filtration: The water saturated with caffeine and other substances is passed through activated carbon filters that remove caffeine molecules while leaving the remaining flavor and aromatic compounds.
- Recirculation: After filtration, the resulting water — with only caffeine removed — is called Green Coffee Extract (GCE). It is reused to soak subsequent batches of beans. Because the water is already saturated with aromatic compounds, during the next soak mainly caffeine is released, while the flavor compounds remain in the beans.
- Control: The process continues until the caffeine level drops to the required minimum (usually below 0.1%).
The Swiss Water Process uses no chemicals and is one of the чистest ways to decaffeinate coffee. Thanks to this, decaf produced this way is considered higher quality because it retains almost the full flavor and aroma typical of regular beans.
Another, equally popular method is decaffeination using organic solvents. The method uses ethyl acetate or methylene chloride. Look for labels such as: "Processed with ethyl acetate" or "EA decaf" — for ethyl acetate. "Processed with methylene chloride" — for methylene chloride.
The main steps of this method are as follows:
- Preparing the beans: The beans are steamed or soaked for up to 10 hours in hot water to open their pores and release caffeine from their internal structure. This step makes the beans more “open” to the solvent.
- Solvent treatment: At this stage, one of two solvents is used: Ethyl acetate (C4H8O2) — a naturally occurring compound often found in fruits such as apples and bananas. Methylene chloride (CH2Cl2) — a synthetic solvent that effectively binds caffeine and evaporates easily.
- Removing the solvent: After caffeine extraction, the beans are thoroughly rinsed with hot water or steamed to remove any residual solvent.
- Drying and final processing: The beans are dried to restore their proper structure and hardness, after which they are ready for roasting.
Using solvents in this process can sometimes leave “traces” of methylene chloride or ethyl acetate in the taste. Coffee decaffeinated this way may also lose more of its flavor and aromatic properties. If a producer uses cheaper raw materials, the resulting cup quality can be lower. On the other hand, solvent-based decaffeination is the most widely available and affordable method and is highly effective: it removes about 97–99% of caffeine.
CO₂ Decaffeination Method.
This method is based on the properties of carbon dioxide, which under high pressure can act as a solvent. CO₂ effectively dissolves caffeine without disturbing the aromatic compounds in the beans. Specialized equipment for working with CO₂ in a supercritical state requires significant investment, so this method is typically used by large producers. Decaf coffee obtained via the CO₂ method may be more expensive due to the complexity of the technology. Look for labels such as: "CO₂ decaffeination" or "Supercritical CO₂ process".
The main steps of this method are as follows:
- Soaking the beans: The coffee beans are soaked in water to make them more porous and receptive to CO₂ penetration.
- High-pressure CO₂ treatment: The beans are placed in a special chamber into which carbon dioxide is introduced under high pressure (approx. 73–300 bar) and at a temperature of about 31°C. In the supercritical state, CO₂ penetrates the beans like a gas and dissolves caffeine like a liquid.
- Caffeine filtration: CO₂ saturated with caffeine flows through a filter (often activated carbon) that removes caffeine, and the carbon dioxide is then recycled.
- Drying the beans: After excess moisture is removed, the beans are ready for roasting.
Carbon dioxide is a natural substance and does not leave chemical traces in the beans. This method is considered eco-friendly because CO₂ can be reused multiple times.
Choosing the best decaffeination method depends on which criteria are most important to you: eco-friendliness, flavor, availability, or safety.
- If ecology and natural processing are your priority — the Swiss Water Process is the best choice.
- If you want a rich flavor and technological precision — choose CO₂-decaffeinated coffee.
- If you need a budget option and don’t mind chemical processing — the organic-solvent method will be suitable.
Of course, every decaffeination method affects the beans. Due to prolonged soaking and other treatments, there are noticeable changes in both flavor/aroma characteristics and the physical properties of the beans. For example, the beans become more porous and less dense, which causes oils to migrate to the surface more intensely.
Another question that comes up among both guests and café staff is: is ristretto also “decaf”? Coffee — regardless of brewing method — undergoes step-by-step dissolution of compounds. First salts and minerals are extracted, then acids, then sugars, and finally caffeine. Ristretto is the first half of the espresso extraction. The same dose of coffee is used as for espresso, but the extraction is stopped earlier, producing only the first portion of liquid (the most concentrated). Since caffeine is extracted toward the end, ristretto contains less caffeine than a full espresso — but that does not mean it is completely caffeine-free.
In our opinion, decaf coffee has its place in coffee culture. Modern decaffeination methods such as the Swiss Water Process or CO₂ extraction make it possible to preserve a significant part of the beans’ flavor qualities, although achieving a taste fully identical to regular coffee is difficult. For many coffee lovers, decaf is a compromise, as the flavor may be slightly less expressive.
You can always order delicious decaf coffee from our website.