Caustic packed tower and venturi acid fume scrubbers for HCl, HF, H₂SO₂, Cl₂, and SO₂ removal from industrial exhaust. PP and FRP construction. IS 6394, CPCB compliant. Mumbai.
Acid Fume Scrubbers — Manufacturer & Supplier, India
Vayuvents manufactures Acid Fume Scrubbers for HCl, HF, H₂SO₂, Cl₂, and SO₂ removal from industrial exhaust. Caustic packed tower scrubbers. PP/FRP. Mumbai.
Acid Fume Scrubbers from Vayuvents use a caustic (NaOH) scrubbing solution to neutralise and absorb acid gases — HCl, HF, Cl₂, SO₂, and H₂SO₂ mist — commonly generated in electroplating, pickling, chemical processing, and semiconductor manufacturing exhaust streams. The alkaline scrubbing liquid reacts with the acidic gas, converting it to a soluble salt that is carried away in the recirculating liquid.
Vayuvents manufactures acid fume scrubbers as packed tower designs (most effective for soluble gas removal) and venturi designs (effective for hot gas, sticky dust, and combined gas-particle removal) in PP, FRP, SS304, and SS316L construction at our Vasai, Mumbai works — PP and FRP are typically preferred over stainless steel for the most aggressive acid fume streams since stainless steel corrodes in concentrated acid service.
The scrubbing liquid concentration and recirculation rate is calculated based on the acid gas inlet concentration and required removal efficiency. An automatic pH monitoring and caustic dosing system maintains the scrubbing liquid at the optimum pH for maximum absorption efficiency throughout operation.
Full system supply includes: scrubber shell with packing or venturi throat, liquid distributor, mist eliminator, integral sump, recirculation pump, make-up water connection, automatic caustic dosing system, and control panel with pH monitoring.
Key Features & Benefits
Gas and Particle Removal
Wet scrubbers simultaneously remove particulate matter and soluble gases (HCl, H₂SO₂, NH₃, HF) in a single operation — unlike bag filters which only handle particulate.
Cools and Humidifies Gas
The scrubbing water cools the gas stream and saturates it with water vapour — suitable for hot process gases that would damage dry filtration equipment.
Chemical-Resistant Construction
PP, FRP, SS316, and PVC-lined MS construction — chemical-resistant to the corrosive scrubbing solutions required for acid gas removal.
Recirculating Scrubbing Liquid
Integral sump with recirculation pump — recycles scrubbing liquid to reduce water consumption and allow chemical dosing for enhanced gas absorption.
Acid Gas Removal
Caustic scrubbing (NaOH solution) removes HCl, HF, Cl₂, and SO₂. Acid scrubbing (H₂SO₂) removes NH₃ and amines. Matched to the specific gas composition.
Handles Sticky and Wet Dust
Wet scrubbing handles sticky, hygroscopic, and water-soluble dust that would blind bag filters — ideal for wax, soap, and food dust applications.
Simple Construction
No filter media to replace, no pulse-jet system — simple packed tower or venturi design with low maintenance requirements.
CPCB Compliant
System designed to meet CPCB emission norms for both particulate and gaseous pollutants at the stack outlet.
Technical Specifications
| Parameter | Specification |
|---|---|
| Airflow Capacity | 500 to 50,000 m³/hr |
| Collection Efficiency | 90 to 99% for particles above 1 micron and soluble gases |
| Packing Material | PP Pall rings / Raschig rings / Structured packing |
| Scrubbing Liquid | Water / NaOH solution / H₂SO₂ solution (as per application) |
| Pressure Drop | 100 to 500 mmWC across packing |
| Shell Material | PP / FRP / SS304 / SS316 / PVC-lined MS |
| Packing Height | 1 to 3 metres (per removal efficiency required) |
| Sump | Integral sump with recirculation pump |
| Standards | IS 6394 | IS 4894 | CPCB norms |
Product Images
Where It Is Used
METAL & CHEMICAL PROCESSING
- Electroplating & Metal Finishing: HCl, H₂SO₂, and cyanide fume scrubbing.
- Chemical Plants: Acid gas, alkali vapour, and solvent fume removal.
- Fertiliser Plants: Ammonia and HF scrubbing from process vents.
- Battery Manufacturing: H₂SO₂ acid mist and hydrogen sulphide scrubbing.
- Pickling & Passivation: HNO₃, HF, and HCl mixed acid fume scrubbing.
- Semiconductor Manufacturing: HF and acid exhaust gas scrubbing.
PHARMA, FOOD & SPECIALTY
- Pharmaceutical Plants: Solvent recovery exhaust scrubbing.
- Food Processing: Cooking odour and ammonia refrigerant gas scrubbing.
- Foundries: Phenol-formaldehyde binder smoke scrubbing from mould curing.
- Printing & Packaging: Solvent fume scrubbing from flexographic printing.
- Textile Dyeing: Acetic acid, ammonia, and hydrogen sulphide scrubbing.
- Municipal Wastewater Treatment: H₂S and mercaptan odour scrubbing.
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FAQs — Acid Fume Scrubbers
A wet fume scrubber passes contaminated air or gas through a scrubbing liquid — typically water or a chemical solution — to remove particulate matter and soluble gases. In a packed tower scrubber, the gas flows upward through a bed of packing (PP Pall rings or structured packing) while scrubbing liquid flows down from the top, creating intimate gas-liquid contact. Soluble gases are absorbed into the liquid and particulate is captured by the liquid droplets. In a venturi scrubber, high-velocity gas entrains water droplets that capture fine particulate.
Wet scrubbers remove: (1) acid gases — HCl, HF, Cl₂, SO₂ (using NaOH solution); (2) alkaline gases — NH₃, amines (using H₂SO₂ or citric acid solution); (3) soluble organic vapours — formaldehyde, acetaldehyde (using water or oxidant solution); (4) water-soluble particulate — sticky dust, water-soluble salts. Wet scrubbers do NOT effectively remove non-polar organic solvents (toluene, hexane) or highly insoluble gases (CO, NO, NO₂ without additives).
A packed tower scrubber (also called a wet packed column or absorption tower) uses a bed of packing material over which water or chemical solution flows — providing large surface area for gas absorption. It is most effective for soluble gas removal. A venturi scrubber uses high-velocity gas flow through a venturi throat where water is injected — the velocity creates fine water droplets that capture particulate. Venturi scrubbers are better for fine particulate collection from hot, sticky, or water-soluble dust streams.
For HCl, H₂SO₂, and HF acid fume scrubbing: PP or FRP construction for the shell, packing support grid, and liquid distributor — stainless steel corrodes in concentrated acid service. For mild acid service and general industrial scrubbing: SS304 or SS316L. For very concentrated acid or oxidising acid (HNO₃, hot H₂SO₂): PVDF or ECTFE-lined construction. Vayuvents recommends the correct construction material based on the specific acid type and concentration.
Yes. The spent scrubbing liquid from a wet scrubber contains the absorbed contaminants — acid gases form acidic effluent, alkali gases form alkaline effluent, and particulate is present as a slurry. This effluent must be treated in a wastewater treatment system before disposal to drain. Vayuvents provides a wastewater quantity estimate and pH neutralisation recommendation with each scrubber system design.
In cold climates (below 5°C ambient), wet scrubbers require freeze protection for the scrubbing liquid recirculation system and sump. Insulation, heat tracing, and anti-freeze additives are used. For outdoor installation in cold climates, Vayuvents provides insulated scrubber packages with heat-traced piping and sump. In Indian climates this is rarely an issue.
Contact Vayuvents at enquiry@vayuvents.com or call +91 90961 88703. Share the gas flow in m³/hr, gas temperature, specific fume/gas to be removed, inlet concentration, and CPCB outlet requirement. We will design the correct scrubber system and provide a technical and commercial proposal within 24 hours.