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Home / Case Studies / Adsorption Filters for Fluosilicic Acid (H₂SiF₆) Storage Tanks
Adsorption Filters for Fluosilicic Acid (H₂SiF₆) Storage Tanks
Project Feature
Design and supply of adsorption filters for cleaning air from vapors of 18–23% hydrofluosilicic acid (H2SiF6, hexafluosilicic acid и fluosilicic acid) during storage tank filling and operation.
Production Process
Filling of storage tank-containers with fluosilicic acid via pipeline and pump.
Two tanks with volumes of 25 m³ and 100 m³, filled periodically throughout the year.
During filling, vapors are displaced from the tank into the atmosphere through the breather system.
Two tanks with volumes of 25 m³ and 100 m³, filled periodically throughout the year.
During filling, vapors are displaced from the tank into the atmosphere through the breather system.
Problem
Release of aggressive and corrosive vapors (HF, SiF₄) during tank filling, creating environmental, safety, and corrosion risks.
Task
Select and supply adsorption filters to capture hydrofluorosilicic acid vapors with high efficiency while ensuring continuous operation and compatibility with outdoor installation conditions.
Current system component
Tank breather vent / breathing line of storage tanks.
Temperature
Process gas temperature: 20–40°C
Ambient temperature: -51 to +38°C
Ambient temperature: -51 to +38°C
Gas/Dust
Vapors of H₂O, HF, and SiF₄ (air + water vapor ~99%, HF + SiF₄), highly corrosive medium (pH < 1).
Initial Data
Client Communication
Client:
Please send a commercial proposal for the supply of:
1. Air purification filter for vapors of 18–23% fluosilicic acid – 1 unit.
Medium name: vapors of H₂O, HF, SiF₄
Medium composition: air + water vapor 99%, HF + SiF₄
Freezing point: -15°C
Corrosiveness: high, pH < 1
Medium temperature: 20–40°C
Ambient temperature: -51 to +38°C
Location: outdoor installation
Required filtration efficiency: 1 µm
Housing material: stainless steel
Filter element: cartridge with activated carbon
Removal efficiency: 95%
Nominal diameter (DN): 100 mm
With two flanges DN80 mm
Gaskets: acid-resistant paronite
Operating mode: continuous
2. Air purification filter for vapors of 18–23% fluosilicic acid – 1 unit.
Medium name: vapors of H₂O, HF, SiF₄
Medium composition: air + water vapor 99%, HF + SiF₄
Freezing point: -15°C
Corrosiveness: high, pH < 1
Medium temperature: 20–40°C
Ambient temperature: -51 to +38°C
Location: outdoor installation
Required filtration efficiency: 1 µm
Housing material: stainless steel
Filter element: cartridge with activated carbon
Removal efficiency: 95%
Nominal diameter (DN): 80 mm
With two flanges DN80 mm
Gaskets: acid-resistant paronite
Operating mode: continuous
Manufacturer is not critical; delivery time is important.
Please specify the delivery time and payment terms.
1. Air purification filter for vapors of 18–23% fluosilicic acid – 1 unit.
Medium name: vapors of H₂O, HF, SiF₄
Medium composition: air + water vapor 99%, HF + SiF₄
Freezing point: -15°C
Corrosiveness: high, pH < 1
Medium temperature: 20–40°C
Ambient temperature: -51 to +38°C
Location: outdoor installation
Required filtration efficiency: 1 µm
Housing material: stainless steel
Filter element: cartridge with activated carbon
Removal efficiency: 95%
Nominal diameter (DN): 100 mm
With two flanges DN80 mm
Gaskets: acid-resistant paronite
Operating mode: continuous
2. Air purification filter for vapors of 18–23% fluosilicic acid – 1 unit.
Medium name: vapors of H₂O, HF, SiF₄
Medium composition: air + water vapor 99%, HF + SiF₄
Freezing point: -15°C
Corrosiveness: high, pH < 1
Medium temperature: 20–40°C
Ambient temperature: -51 to +38°C
Location: outdoor installation
Required filtration efficiency: 1 µm
Housing material: stainless steel
Filter element: cartridge with activated carbon
Removal efficiency: 95%
Nominal diameter (DN): 80 mm
With two flanges DN80 mm
Gaskets: acid-resistant paronite
Operating mode: continuous
Manufacturer is not critical; delivery time is important.
Please specify the delivery time and payment terms.
Engineer Torch-Air:
Please provide the following specifications:
1) Design pressure inside the unit
2) Required adsorbent volume, or alternatively, the volumetric flow rate of the gas mixture and the maximum allowable pressure drop
1) Design pressure inside the unit
2) Required adsorbent volume, or alternatively, the volumetric flow rate of the gas mixture and the maximum allowable pressure drop
Client:
Thank you for your email!
Additional information:
1. Air purification filter for vapors of 18–23% fluosilicic acid – 1 unit
Chemical formula: vapors of H₂O, HF, SiF₄
Concentration: 18–23% hydrofluorosilicic acid; air + water vapor 99%, HF + SiF₄
Temperature for filling: Min. 20°C, Max. 40°C
Storage temperature: Min. 20°C, Max. 40°C
Outside temperature: Min. -51°C, Max. +38°C
Installation place: Outdoor
Heater needed: No
Storage container size: 25 m³
Container filling level up to: 100%
Filling speed: Max. 30 m³/h
Filling mode: —
Draining speed: Not required
Filling frequency (e.g., monthly): 12 times
Total number of fillings: 132 times
Filler pipe: through pipe DN 100
With pump: 30 m³/h
Is overflowing possible? No, filling level regulator
The values indicated are the real conditions and circumstances
2. Air purification filter for vapors of 18–23% fluosilicic acid – 1 unit
Chemical formula: vapors of H₂O, HF, SiF₄
Concentration: 18–23% hydrofluorosilicic acid; air + water vapor 99%, HF + SiF₄
Temperature for filling: Min. 20°C, Max. 40°C
Storage temperature: Min. 20°C, Max. 40°C
Outside temperature: Min. -51°C, Max. +38°C
Installation place: Outdoor
Heater needed: No
Storage container size: 100 m³
Container filling level up to: 80%
Filling speed: Max. 30 m³/h
Draining speed: Max. 30 m³/h
Filling mode: via pipeline through the top nozzle
Filler pipe: DN 80
With pump: 30 m³/h
Filling frequency (e.g., monthly): 4 times
Total number of fillings: 44 times
Is overflowing possible? No, filling level regulator
The values indicated are the real conditions and circumstances
Additional information:
1. Air purification filter for vapors of 18–23% fluosilicic acid – 1 unit
Chemical formula: vapors of H₂O, HF, SiF₄
Concentration: 18–23% hydrofluorosilicic acid; air + water vapor 99%, HF + SiF₄
Temperature for filling: Min. 20°C, Max. 40°C
Storage temperature: Min. 20°C, Max. 40°C
Outside temperature: Min. -51°C, Max. +38°C
Installation place: Outdoor
Heater needed: No
Storage container size: 25 m³
Container filling level up to: 100%
Filling speed: Max. 30 m³/h
Filling mode: —
Draining speed: Not required
Filling frequency (e.g., monthly): 12 times
Total number of fillings: 132 times
Filler pipe: through pipe DN 100
With pump: 30 m³/h
Is overflowing possible? No, filling level regulator
The values indicated are the real conditions and circumstances
2. Air purification filter for vapors of 18–23% fluosilicic acid – 1 unit
Chemical formula: vapors of H₂O, HF, SiF₄
Concentration: 18–23% hydrofluorosilicic acid; air + water vapor 99%, HF + SiF₄
Temperature for filling: Min. 20°C, Max. 40°C
Storage temperature: Min. 20°C, Max. 40°C
Outside temperature: Min. -51°C, Max. +38°C
Installation place: Outdoor
Heater needed: No
Storage container size: 100 m³
Container filling level up to: 80%
Filling speed: Max. 30 m³/h
Draining speed: Max. 30 m³/h
Filling mode: via pipeline through the top nozzle
Filler pipe: DN 80
With pump: 30 m³/h
Filling frequency (e.g., monthly): 4 times
Total number of fillings: 44 times
Is overflowing possible? No, filling level regulator
The values indicated are the real conditions and circumstances
Engineer Torch-Air:
As a solution, an adsorption filter with a lime-based chemical sorbent would be suitable.
The unit housing can be made of polypropylene or chemical-resistant stainless steel.
The preliminary dimensional drawing is attached.
We will replace the connection flanges with the required ones, please specify the type and design.
The unit housing can be made of polypropylene or chemical-resistant stainless steel.
The preliminary dimensional drawing is attached.
We will replace the connection flanges with the required ones, please specify the type and design.
Client:
Thank you for the commercial proposal.
We need 2 filters.
Our design engineer made a small correction to the nominal diameter for the first filter (it was 100 mm and DN80, the correct size is 50 mm and DN50).
1. Air purification filter for vapors of 18–23% hydrofluorosilicic acid (nominal diameter: 50 mm) – 1 unit
Tank-container size 25 m³ max.
Filter design: with 2 flanges DN50, PN 1.00 MPa.
2. Air purification filter for vapors of 18–23% fluosilicic acid (nominal diameter: 80 mm) – 1 unit
Storage container size 100 m³ max.
Filter design: with 2 flanges DN80, PN 1.00 MPa.
Additional requirements:
The design of both filters must include two flange connections for convenient placement and maintenance, as well as vapor outlets from the service area.
Please provide the following:
We need 2 filters.
Our design engineer made a small correction to the nominal diameter for the first filter (it was 100 mm and DN80, the correct size is 50 mm and DN50).
1. Air purification filter for vapors of 18–23% hydrofluorosilicic acid (nominal diameter: 50 mm) – 1 unit
Tank-container size 25 m³ max.
Filter design: with 2 flanges DN50, PN 1.00 MPa.
2. Air purification filter for vapors of 18–23% fluosilicic acid (nominal diameter: 80 mm) – 1 unit
Storage container size 100 m³ max.
Filter design: with 2 flanges DN80, PN 1.00 MPa.
Additional requirements:
The design of both filters must include two flange connections for convenient placement and maintenance, as well as vapor outlets from the service area.
Please provide the following:
- Drawings of the filters according to the indicated corrections.
- A sketch or photo of the proposed filters for visual review.
- Weight data of the filled filters (polypropylene and chemical-resistant stainless steel: 5 kg and 70 kg filling) for the calculation of fastening units and layout.
- Operation and maintenance manual.
- Documentation for the filler material for including disposal data in the project documentation.
Engineer Torch-Air:
I am attaching proposals for adsorbers. Different options may be available.
The Sirocco adsorption filter is designed to capture various chemical compounds in the air. It prevents chemical compounds from entering the tank or escaping from it. The filter is mounted on the tank breather valve and can be installed directly on the tank or on another surface near the tank.
Advantages:
The Sirocco adsorption filter is designed to capture various chemical compounds in the air. It prevents chemical compounds from entering the tank or escaping from it. The filter is mounted on the tank breather valve and can be installed directly on the tank or on another surface near the tank.
Advantages:
- Easy maintenance
- Filtration efficiency up to 99.9%
- Components manufactured in the USA – no issues with repair and service
- The housing can be customized with insulation and electric heating
Sirocco Adsorption Filter Diagram
Adsorber Diagram
Proposed Solutions
Based on the provided operating data, we proposed the use of adsorption filters with a lime-based chemical sorbent for effective removal of vapors of fluosilicic acid.
The proposed solution includes:
The proposed solution includes:
- Adsorption filters installed on the tank breather system, preventing aggressive chemical vapors from entering the atmosphere or the service area.
- Two filters with different nominal diameters (DN50 and DN80), selected according to the storage tank volumes (25 m³ and 100 m³).
- High-efficiency chemical sorbent, designed for neutralization of HF and SiF₄ vapors.
- Housing options in polypropylene or chemical-resistant stainless steel, suitable for highly corrosive environments.
- Design with two flange connections, allowing convenient installation, maintenance, and safe vapor discharge away from the operator area.
- Outdoor installation capability, without the need for additional heating, operating reliably in ambient temperatures from -51 to +38°C.
- Supply of preliminary dimensional drawings, technical documentation, and operation manuals to support installation and integration into the customer’s system.
Best Adsorber for Fluosilicic Acid (H2SiF6)
We always perform precise calculations and offer expert assistance in selecting the optimal dust collection or gas cleaning systems, typically completing this process within 1 to 2 days
Head of Engineering,
Vladimir Nikulin
Vladimir Nikulin
CALCULATION AND SELECTION
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