What is cold distillation and why is it used for premium non-alcoholic spirits?
The physics of cold distillation are straightforward: boiling point is a function of pressure, not just temperature. By reducing pressure inside a still to 10–50 mbar, water boils at 10–30°C and alcohol boils at 15–20°C. Botanical compounds with boiling points between 150–300°C at atmospheric pressure can be co-distilled at 40–60°C under vacuum, preserving structures that would otherwise degrade.
In non-alcoholic spirit production, the standard equipment is a rotary evaporator (rotovap) at the artisanal scale or a commercial vacuum still at production scale. Seedlip's original production used a rotovap to extract individual botanical distillates — each botanical macerated in water, then cold-distilled separately to capture its unique aromatic signature. The individual distillates are then blended. This approach gives extraordinary control over each botanical's contribution but is labour-intensive and expensive per unit.
The absence of ethanol in the macerating liquid is a fundamental challenge: ethanol extracts non-polar aromatic compounds efficiently; water does not. A cold distillation of botanicals macerated in water captures primarily polar, water-soluble volatile compounds. Non-polar terpenes (the most aromatic fraction of many botanicals) are partially lost because they don't dissolve well in the aqueous macerate in the first place. Some producers use dilute ethanol maceration (even 5–10% ABV) for the maceration step, then cold-distill to reduce the alcohol to near zero while capturing the broadest possible aromatic range — technically still a 'distilled NA spirit.'
| Distillation type | Temperature | What's preserved | What's lost |
|---|---|---|---|
| Conventional atmospheric | 78–100°C | Heat-stable compounds | Delicate terpenes, esters |
| Vacuum (cold) distillation | 20–40°C | Heat-sensitive aromatics | Very non-polar compounds (if water macerate) |
| CO₂ supercritical extraction | 35–55°C | Full spectrum including non-polar | Very little — most complete method |
The zeroproof.one guide to premium non-alcoholic spirits explains how distillation method shapes the final product — with specific examples from Seedlip, Monday, and Ceder's.