product Introduction
The Caustic Scrubber for H₂S Removal is an industrial gas treatment system, widely used in natural gas processing, refinery off-gas treatment, biogas upgrading, and industrial acid gas purification.
Key Features
- Packed or tray tower with countercurrent gas-liquid contact.
- Knockout drum upstream for bulk liquid and particle separation ≥ 5 μm.
- Mist eliminator at gas outlet for droplet removal.
- Closed-loop circulation system with pump-driven spray distribution.
- NaOH concentration control range 2–10% in circulation loop.
- Tower material: FRP or 316L stainless steel for alkaline service.
- PLC-based system for flow, pH, and circulation parameter control.
Working Principle
Step 1: Gas Pre-Treatment
A knockout drum removes liquid droplets and solid particles.
Inlet gas conditioning before absorption section.
Step 2: Counter-Current Absorption
Gas flows upward through a packed or tray tower.
An NaOH solution flows downward via a spray system.
Gas–liquid mass transfer in packed zone.
Step 3: Chemical Reaction
H₂S reacts with NaOH, forming Na₂S / NaHS.
Irreversible absorption in liquid phase.
Step 4: Liquid Circulation
Absorbent recirculated by circulation pump system.
Continuous purge maintains NaOH concentration ≥2%.
Step 5: Clean Gas Outlet
Mist eliminator removes entrained liquid droplets.
Treated gas is discharged to the downstream system.
Industrial Application Scenarios
- Natural gas sweetening plants
- Refinery off-gas treatment systems
- Biogas upgrading and purification
- Petrochemical gas treatment units
- Landfill gas desulfurization
- Industrial acid gas emission control
Engineering Design & Customization Capability
Design Inputs:
- H₂S concentration and variability
- Gas flow rate (Nm³/h)
- CO₂ content
- Operating pressure and temperature
- Required outlet emission limit
Engineering Methods:
- Process simulation (Aspen Plus / HYSYS)
- Mass transfer efficiency calculation
- Hydraulic design (flooding / pressure drop control)
- Packing selection optimization
Comparison with Other H₂S Removal Technologies
|
Technology |
Principle |
Strength |
Limitation |
|
Caustic Scrubber |
Chemical absorption (NaOH/KOH) |
Fast response, high efficiency |
Chemical consumption |
|
Amine System |
Regenerative absorption |
CO₂ + H₂S removal |
Complex regeneration system |
|
Activated Carbon |
Physical adsorption |
Simple operation |
Low capacity |
|
Claus Process |
Sulfur recovery |
Sulfur recovery |
High CAPEX, large-scale only |
Manufacturing, Testing & Delivery
- Process and mechanical design
- Fabrication (ASME / GB150 compliance)
- Factory Acceptance Test (FAT)
- 72-hour continuous performance testing
- Site installation guidance
- Commissioning support
FAQ
Q: What type of gas streams is a Caustic Scrubber not suitable for?
A: Gas streams requiring sulfur recovery or ultra-low H₂S removal below adsorption-based treatment range.
Q: How is spent caustic solution handled in the system?
A: Spent solution containing Na₂S/NaHS is discharged via controlled purge and treated by oxidation or external neutralization depending on the site wastewater system.
Q: Can the system operate under fluctuating H₂S inlet concentrations?
A: Yes. The system operates under variable load conditions with circulation and dosing control to maintain stable performance.
Q: What factors influence NaOH consumption in operation?
A: NaOH consumption is determined by inlet H₂S load, gas flow rate, and liquid–gas contact conditions.
Q: What upstream gas quality conditions are required for stable operation?
A: Gas must be pre-treated to remove bulk liquids and solids using a knockout drum or equivalent separation unit.
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