Gas Treatment & Generation · Engineered by SorbiTech

Heatless Desiccant Air Dryer

Name: Heatless Desiccant Air Dryer
Brand: SorbiTech

Twin tower heatless desiccant compressed air dryer using activated alumina or silica gel for instrument and process air to pressure dew points below minus 40 °C.

Capacity / Flow 50–10,000 Nm³/h

Design Standards ASME VIII · PED · ISO 8573 air quality

Inlet Conditions 7–10 barg compressed air · saturated

Outlet Specification PDP −20 to −40 °C (per cycle design)

Operating Pressure (bar) 7–10

Quick Answer

A Heatless Desiccant Air Dryer uses twin towers of activated alumina or silica gel in a pressure swing cycle to dry compressed air to pressure dew points of minus 20 to minus 40 °C without a regeneration heater. Standard for instrument air, process air, and pharmaceutical clean air services where reliability and low maintenance are critical.

Pressure Swing Cycle Without Thermal Regeneration

The SorbiTech Heatless Desiccant Air Dryer dries compressed air on a fast pressure swing cycle that needs no regeneration heater. Twin tower vessels charged with activated alumina drying grade or silica gel white run 180 degrees out of phase: one tower adsorbs at line pressure, the other regenerates by depressurising to atmospheric and purging with dry product air drawn from the on line tower. The cycle repeats every 4 to 10 minutes, delivering pressure dew points of minus 20 to minus 40 °C continuously.

Activated Alumina vs Silica Gel Charge

The choice of desiccant follows the duty severity. Activated alumina drying grade resists the fast cycling that breaks softer media into fines and is the reference grade for industrial and offshore service. Silica gel white reaches a slightly lower pressure dew point at moderate humidity and is the more economical choice for clean dry feed in pharmaceutical and packaging applications. SorbiTech sizes the bed against the contracted dew point, the inlet humidity, and the campaign life target.

Scope of Supply

The complete package includes twin desiccant towers to ASME VIII or PED with corrosion resistant internals, fast acting cycle valves with high cycle life rating, an inlet coalescing filter for the oil and liquid water carryover from the compressor, an outlet particulate filter for any desiccant fines, and a PLC control with cycle adjustment based on outlet dew point. Purge ratio is typically 15 percent of dry product flow.

Applications and Sector Coverage

Instrument air for distributed control systems and pneumatic valves is the largest market; pharmaceutical clean air for sterile filling lines, electronics manufacturing dry air, and offshore platform instrument air follow. Sector coverage spans industrial gas and air separation, pharmaceutical and life sciences, and oil and gas.

Delivery and Lifecycle

Delivered turnkey by SorbiTech or fabricated to client drawings under SorbiTech scope. The alumina or silica gel charge gives 5 to 7 years of service, and the replacement contract maintains continuous operation through scheduled changeout windows.