Natural Gas Purification, LNG Extraction & Liquefaction Units

From feed gas treatment to LNG storage – modular and large-scale solutions for cleaner, high-value natural gas.

Key Highlights (bullets or icons):

  • Complete purification & liquefaction line

  • BOG helium extraction for added value

  • Skid-mounted & large liquefaction factories

  • Proven projects up to 1 million m³/day

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PRODUCT OVERVIEW

Integrated Natural Gas Processing & LNG Solutions

Evertech provides end-to-end systems for natural gas purification, BOG helium extraction and liquefaction. Our solutions cover every stage of the value chain—removing impurities, recovering high-value components, liquefying natural gas, and delivering safe storage and transport.

Designed for both modular deployment and large-scale LNG plants, Evertech units combine proven process technology with low energy consumption and high reliability.

NATURAL GAS PURIFICATION & LIQUEFACTION TREATMENT

Feed Gas Purification Package

Before gas can be liquefied, it must meet strict technical indicators. Evertech’s purification system prepares natural gas for pipeline or LNG service by removing acid gases, sulfur, water, nitrogen, heavy hydrocarbons and mercury.

  • Decarbonization

    Removes CO₂ to meet natural gas technical indicators and downstream purification requirements, using NHD or MDEA processes or dry adsorption.

  • Desulfurization

    Removes H₂S and sulfur compounds with iron wet desulfurization, MEDA desulfurization or dry adsorption technology.

  • Dehydrocarbon

    Strips light hydrocarbons to recover valuable liquids and ensure gas meets specifications before entering the pipeline or liquefaction section.

  • Denitrification

    Treats high-nitrogen gas that cannot be sent directly to the pipeline. Nitrogen removal raises the calorific value to required levels.

  • Dehydration

    Removes water using triethylene glycol (TEG) dehydration or molecular sieve adsorption to prevent ice and hydrate formation.

  • Demercuration

    Eliminates trace mercury to protect aluminum heat exchangers and downstream equipment.

NATURAL GAS – BOG HELIUM EXTRACTION

BOG Helium Recovery Systems

LNG boil-off gas (BOG) typically contains 1–2% helium. Evertech’s helium extraction package turns this trace component into a high-value product while improving liquefaction performance.

Key Process Steps:

  • Cryogenic Separation & Purification

    Concentrates methane and thick helium (crude helium) using cryogenic separation, re-liquefies methane, and reduces condensation gas enrichment in the LNG unit—boosting liquefaction capacity.

  • Dehydrogenation

    Removes hydrogen from crude helium via catalytic oxidation or low-temperature adsorption, lowering hydrogen content to about 1 ppm.

  • Dehydration

    Removes residual water and water formed during dehydrogenation using molecular sieve adsorption, achieving water content around 1 ppm.

  • Denitrification

    Removes oxygen and nitrogen with low-temperature adsorption to produce high-purity helium that meets technical specifications.

NATURAL GAS LIQUEFACTION SOLUTION

Liquefaction, Storage & Transportation

5.1 Liquefaction Front-End (Purification)

One of the first dedicated natural gas liquefaction teams in China.

  • Desulfurization: dry / wet methods

  • Decarbonization: MDEA / adsorption

  • Demercurization: dry adsorption

  • Dehydration: molecular sieve adsorption

5.2 Liquefaction Technology

Strong technical strength with low refrigeration energy consumption.

  • Refrigeration modes: MRC (Mixed Refrigerant Cycle) or nitrogen gas cycle

  • Expansion schemes: expansion / direct expansion / SMRC

  • Refrigeration temperature: ≈ −165°C

  • Liquefaction pressure: 3.0–8.0 MPa

5.3 Storage & Transportation

  • Process flow designed to be safe, reliable and easy to operate

  • Optimised layout for LNG storage tanks, BOG handling and truck loading

  • Integrated safety protection and monitoring

TYPICAL PROCESS FLOW

Typical Process of a Natural Gas Liquefaction Unit

 

 

  • Filtration & Pressure Regulation

    Raw gas is filtered and pressure-regulated; solids, liquids and condensates are removed.

  • Deacidification (CO₂ Removal)

    CO₂ and acid gases are absorbed and stripped, preventing freezing in cryogenic exchangers.

  • Dehydration

    TEG or molecular sieve units remove water to ultra-low levels.

  • Mercury Removal

    Activated carbon beds capture trace mercury to protect equipment.

  • Liquefaction & Refrigeration Cycle

    Gas passes through the cold box where mixed refrigerant or nitrogen cycles cool it to LNG temperature.

  • LNG Storage & BOG Handling

    LNG is stored in cryogenic tanks, with boil-off gas recycled into the process or used as fuel.

PRODUCT CONFIGURATIONS

Liquefaction Unit Configurations

7.1 Small Skid-Mounted LNG Units

For modular, fast-track projects.

  • Capacities:

    • 30,000 m³/day

    • 50,000 m³/day

    • 100,000 m³/day

  • Construction period: 6–8 months

Key Advantages:

  • Factory-assembled skids for rapid deployment

  • Smaller footprint and reduced civil works

  • Ideal for remote gas fields, peak-shaving and distributed LNG supply

 

7.2 Liquefied Factory Units (Large-Scale Plants)

For large, long-term LNG supply and export projects.

  • Capacities:

    • 300,000 m³/day

    • 500,000 m³/day

    • 1,000,000 m³/day

  • Construction period: 10–14 months

Key Advantages:

  • High throughput with optimised energy efficiency

  • Full integration with upstream and downstream infrastructure

  • Suitable for regional hubs and large industrial clusters

INDUSTRIES & APPLICATIONS

Where Our Solutions Are Used

  • LNG production and export terminals

  • City gas and pipeline gas upgrading

  • Peak-shaving LNG plants

  • Petrochemical and refinery off-gas treatment

  • BOG helium recovery facilities

  • Industrial customers requiring high-purity CO₂ and helium

PAST PROJECTS 

Proven Track Record

Featured Projects:

  • Skid-Loading Natural Gas Liquefaction Project

    Modular skid-mounted LNG plant demonstrating fast installation and flexible output.

  • 1 Million m³/day Natural Gas Liquefaction Project

    Large-scale LNG facility showcasing full Evertech process integration—from purification to storage and loading.

  • 500,000 m³/day Natural Gas Liquefaction Project

    Mid-large plant supplying LNG to regional industrial users.

  • Natural Gas Liquefaction Unit

    Standalone cold-box / liquefaction module integrated into an existing gas processing complex.

WHY EVERTECH

Why Choose Evertech

  • Over a decade of experience in natural gas liquefaction technologies

  • Complete solutions: purification, helium extraction, liquefaction, storage and transport

  • Modular and mega-scale options to match different investment levels

  • Emphasis on energy efficiency, safety and ease of operation

  • Proven performance in multiple reference projects up to 1,000,000 m³/day

Talk to Our Engineering Team

Planning a new LNG plant, upgrading an existing facility, or looking to recover helium from BOG? Share your gas composition and capacity requirements—our engineers will propose a tailored solution.

  • Send Us Your Gas Specs

  • Book a Technical Consultation

📧 Email: dannee@merlionix.com

📞 Phone: +65-8511-8989

📍 Address: 10 Anson Road #38-03 Singapore 079903