Mine Site Greenhouse Gas Mitigation

Selective Absorption of Methane by Ionic Liquids (SAMIL)

Mine Site Greenhouse Gas Mitigation » Mine Site Greenhouse Gas Mitigation

Published: May 23Project Number: C28076

Get ReportAuthor: Andrew Maddocks, Priscilla Tremain, Behdad Moghtaderi, Shaolei Gai, Daniel Eschebach, Anna Raynsford | The University of Newcastle

This third and final stage of this project was the culmination of a multi-phase program of work investigating the applicability of ionic liquids for the selective absorption of methane from ventilation air. The program of work consisted of three phases:

  • C27008 Selective absorption of methane by ionic liquids (SAMIL).
  • C28076 Selective absorption of methane by ionic liquids (SAMIL). Phase 2: demonstration in a packed bed.
  • C28076 (extension) Selective absorption of methane by ionic liquids (SAMIL). Phase 3: Pilot-scale demonstration and mine site integration study.

Proposed as an alternative approach to high temperature oxidation of ventilation air methane (VAM), the separation of methane using ionic liquids would occur at temperatures significantly less than the autoignition temperature of lean air-methane mixtures. This approach has the potential to remove the safety concerns related to connecting high temperature abatement processes to the ventilation system of an underground coal mine. The captured methane could be utilised to produce electricity and/or heat for the process. A key requirement for any VAM abatement process is to minimise the energy demand for the project, with a target of supplying all power requirements from the VAM.

Phase 1, C27008,  of the project focussed on fundamental investigations into the chemistry of ionic liquids and low-concentration methane mixtures. A reversible process for the selective absorption of methane in ionic liquids was successfully demonstrated in Phase 1. The process occurred at less than 100 oC, significantly less than the autoignition temperature of lean air-methane mixtures. Selectivities of methane were greater than ideal selectivities predicted by individual species absorption data reported in the literature.

Translating the fundamental findings from Phase 1 to a suitable absorption process was the focus of Phase 2. The high viscosity of ionic liquids required a novel absorption process that could facilitate a high gas-liquid mass transfer rate. A rotating packed bed experimental apparatus was constructed to investigate the influence of various process parameters such as absorption temperature, residence time, contact surface area and rotational speed on the absorption of methane. Optimisation of the ionic liquids was not included as part of the project and the best performing ionic liquid from Phase 1 of the project was selected for Phase 2. The experimental results confirmed that a rotating packed bed was a suitable technology for the process and the process could be undertaken at low temperatures and pressures.

The experiments in Phase 2 were conducted as batch absorption and desorption experiments. A continuous process would be required for a mine site. Phase 3 of the project consisted of demonstrating the process in a continuous bench-scale pilot-plant with a focus on determining the scale and power consumption of a process for a 20 m3/s module at an operating mine site.


To demonstrate the continuous operation of a bench-scale pilot-plant and understand the mine site integration challenges of the ionic liquid process, the following tasks were undertaken:

  • Design and construction of a continuous bench-scale pilot-plant;
  • An experimental program investigating key factors that influence the absorption of gases by ionic liquids such as gas and liquid flow rates;
  • Process modelling to determine the energy requirements of a 20 m3/s process;
  • Evaluation of the process for application at a typical mine site.


The key findings for the project were:


While the program of work successfully demonstrated the selective absorption of methane using ionic liquids, the data obtained from the continuous operation of the process indicated that the process would not be viable for large-scale applications. Without significant improvements in ionic liquid properties (through discovering new ionic liquids), further examination of VAM capture using ionic liquids is not warranted.

The reports for C28076 (published May 2023 and August 2020) are provided as a set.


Health and safety, productivity and environment initiatives.

Recently Completed Projects

C34019Longwall Bretby Cable Handling Monitoring With Fibre Optics

This project examined the potential of using fibre optic sensing tec...

C27049Mine Machine Radar Sensor Integration

The aim of this project was to develop an integrated radar sensor an...

C29007Innovative Coal Burst System To Investigate The Influence Of Confinement Loss And Pre-Conditioning On Coal Burst Mechanism

The challenges associated with designing and operating a safe and pr...


Open Cut

Safety, productivity and the right to operate are priorities for open cut mine research.

Recently Completed Projects

C33035High Water Recovery, Low Cost Desalination Using PV-Powered Membrane Capacitive Deionisation (Mcdi)

Capacitive deionization is a robust, energy efficient and cost effec...

C28035Topsoil Deficits In Site Rehabilitation Accelerated Transformation Of Spoils To Functional Soils

The incorporation of commercial biological amendments (compost, worm...

C34036Tyre Handler Testing Rig Stage 2: Lifting Trials

Tyre handling is a major source of risk in surface mining operations...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Technical Market Support

Mine Site Greenhouse Gas Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C28076Selective Absorption Of Methane By Ionic Liquids (SAMIL)

This third and final stage of this project was the culmination of a ...

C29069Low-Cost Catalyst Materials For Effective VAM Catalytic Oxidation

Application of ventilation air methane (VAM) thermal oxidiser requir...

C23052Novel Stone Dust Looping Process For Ventilation Air Methane Abatement

This multi‐phase project is concerned with the mitigation of m...

Mine Site Greenhouse Gas Mitigation

Low Emission Coal Use

Step-change technologies aimed at reducing greenhouse gas emissions.

Recently Completed Projects

C17060BGasification Of Australian Coals

Four Australian coals were trialled in the Siemens 5 MWth pilot scale ga...

C17060AOxyfuel Technology For Carbon Capture And Storage Critical Clean Coal Technology - Interim Support

The status of oxy-fuel technology for first-generation plant is indicate...

C18007Review Of Underground Coal Gasification

This report consists of a broad review of underground coal gasification,...

Low Emission Coal Use

Mining And The Community

The relationship between mines and the local community.

Recently Completed Projects

C16027Assessing Housing And Labour Market Impacts Of Mining Developments In Bowen Basin Communities

The focus of this ACARP-funded project has been to identify a number...

C22029Understanding And Managing Cumulative Impacts Of Coal Mining And Other Land Uses In Regions With Diversified Economies

The coal industry operates in the context of competing land-uses that sh...

C23016Approval And Planning Assessment Of Black Coal Mines In NSW And Qld: A Review Of Economic Assessment Techniques

This reports on issues surrounding economic assessment and analysis ...

Mining And The Community


National Energy Research,Development & Demonstration Council (NERDDC) reports - pre 1992.

Recently Completed Projects

1609-C1609Self Heating of Spoil Piles from Open Cut Coal Mines

Self Heating of Spoil Piles from Open Cut Coal Mines

1301-C1301Stress Control Methods for Optimised Development...

Stress Control Methods for Optimised Development and Extraction Operations

0033-C1356Commissioned Report: Australian Thermal Coals...

Commissioned Report: Australian Thermal Coals - An Industry Handbook