Efficient Removal of Electrolyte Mist from Green Hydrogen at Low Pressure

January, 2024

Atmospheric alkaline electrolysis is one of the most established green hydrogen technologies. Utilized by major electrolyzer manufacturers and deployed in many upcoming large-scale projects, it offers a mature solution for sustainable hydrogen production.

Necessity of Electrolyte Mist Removal

The hydrogen produced in this process occurs slightly above atmospheric pressure. Hence, pressure is at a premium and any further processing of the hydrogen needs to be carried out with minimal pressure drop. For hydrogen producers, this can be particularly challenging, especially with regards to removing electrolyte mist/aerosols from hydrogen leaving the electrolyzer. The electrolyte mist is highly corrosive and if not removed, can cause corrosion and fouling in downstream equipment like compressors and valves.

Challenges with Existing Methods

Due to the constraint on pressure drop, the current separation methods available to hydrogen producers, such as mist eliminators and scrubbers, tend to be very large, significantly driving up the capital expenditure (capex) costs of green hydrogen projects.

Pall’s Electrolyte Mist Removal Solutions

To tackle this issue, Pall Corporation has launched SepraLYTE™ – a new liquid-gas coalescer designed for the green hydrogen market that will achieve liquid droplet separation at low differential pressure, in a compact design.

SepraLYTE liquid/gas coalescers offer considerable advantages over existing conventional separation products.

Green Hydrogen Production Process

Atmospheric Alkaline Electrolyzer flow scheme

Requirements of Green Hydrogen Plant

Requirements	SepraLYTE™	Mist Eliminator	Scrubber
Low Relative Operating ΔP	✔	✔	✔
Small Size / Footprint	✔	✖	✖
Low Energy Consumption	✔	✔	✖
Insensitivity to “Turn-Down”	✔	✖	✔

Benefits of Using  SepraLYTE for Electrolyte Mist Removal

The main advantage that SepraLYTE liquid gas coalescers bring is the significant reduction in overall size. This helps green hydrogen producers reduce the installation and operating costs of their projects via:

• Reduction in the volume of steel used

• Ease of material handling

• Ease of transportation

Size comparison of Pall’s SepraLYTE liquid gas coalescers & other mist removal equipment

• Capex reduction

• Ease of handling

• Ease of transportation

Brought to You by Quatech Engineering

At Quatech Engineering, we support the adoption of advanced hydrogen technologies and separation solutions across Southeast Asia. As an engineering partner to industrial and energy clients, we help implement compact, low-pressure systems like Pall SepraLYTE™ to ensure your hydrogen infrastructure operates reliably, efficiently, and sustainably.

Learn more or get in touch with our team at www.quatechengineering.com

ReferenceOriginal article from Pall Corporation: https://www.pall.com/en/decarbonization/blog/electrolyst-mist-green-hydrogen.html

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