Air Filters and Chemical Filtration

Alkaline Gas Molecular Filter

A molecular filter using acid-treated activated carbon or engineered pellets to capture ammonia, amines and other basic gaseous contaminants.

Base-Gas Selectivity
Acid-Impregnated Media
High Adsorbent Mass
Contained Pellet Bed

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Product Introduction

The alkaline gas molecular filter is built around an acid-impregnated porous adsorbent that neutralizes ammonia and related basic vapours. Granules are densely packed between rigid mesh faces so the air stream crosses a consistent reaction bed. The cell can be installed in a standard side-access housing or a safe-change system downstream of particulate prefiltration. Separate basic-gas media prevents the premature exhaustion that occurs when general-purpose carbon is exposed to high ammonia loading.

Key Features

Acidic impregnation promotes chemisorption of ammonia and light amines.

Deep packed media provides longer residence time than a thin carbon sheet.

Sealed perimeter gasketing directs all air through the active bed.

Low-dust screens protect downstream HEPA stages from pellet abrasion.

Customer Product Concerns

Ammonia and amines are difficult to retain on untreated carbon and can quickly spread through recirculating ventilation.

General odour carbon shows early breakthrough when ammonia concentration rises.Acid-impregnated media reacts with alkaline molecules and provides higher usable capacity.

A thin pleated filter lacks enough media mass for continuous base-gas exposure.The deep granular bed increases adsorbent quantity and contaminant contact time.

Pellet movement creates voids after shipment.Retaining grids and bed compression keep the media evenly distributed across the face.

Combining acid and base control in one bed wastes selective capacity.A dedicated alkaline-gas stage can be arranged separately from acid- and VOC-removal stages.

Typical Applications

Animal research facilitiesFertilizer and chemical laboratoriesBattery process ventilationWaste treatment roomsAmine-handling production areas

Technical Parameters

Representative dimensions and materials for a base-gas molecular filter are shown below.

Core Material	Acid-impregnated activated carbon or engineered alumina pellets for ammonia and amines
Panel Thickness	150–292 mm overall filter depth
Effective Width	305–610 mm nominal cell width
Maximum Length	Up to 610 mm nominal cell height
Steel Facing Thickness	0.8–1.2 mm galvanized or 304 stainless-steel enclosure
Core Density	480–700 kg/m³ packed impregnated-carbon bulk density
Thermal Conductivity	0.10–0.22 W/(m·K) for the granular adsorbent bed
Surface Finish	Mill-galvanized, brushed stainless steel or chemical-resistant powder coat
Joint Type	Sealed box cell with dual perforated retainers and moulded neoprene face gasket
Customization	Available based on the intended application and operating environment.

Available Options

Ammonia-specific media gradeDisposable or refillable cellFull-size or half-size formatBIBO-compatible gasket arrangement

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