Articles & Press Releases

EPA Releases Report on Upgrading Coal Mine Methane to Pipeline Quality Natural Gas

The EPA, through its Coal Mine Methane Outreach Program, has released a report on upgrading contaminated coal mine gases to pipeline quality. With twelve systems upgrading gas from coal mines the Molecular Gate technology from Guild Associates, Inc. is the leading route to producing pipeline quality natural gas from this resource.

In upgrading this contaminated gas the Molecular Gate process operates at a moderate pressure of about 100 psig and produces pipeline quality sales gas at 90 psig. Coal mine gases are commonly contaminated with both CO2 and N2 and the Molecular Gate process removes both impurities in a single step and thus avoids separate amine processing for CO2 removal and associated operating difficulties and capital and operating cost.

Guild’s first Molecular Gate unit in this service started operation in 2003 with the remaining 11 units provided since that date.


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EPA Publication 430-97-012
Upgrading Drained Coal Mine Methane to Pipeline Quality: A Report on the Commercial Status of System Suppliers

Intrepid Technologies System Produces Pipeline Quality Gas from Digester Gas

By utilizing the Guild PSA System, Intrepid Technologies is now able to produce a valuable natural gas product while benefiting the environment by reducing the production of greenhouse gases.

Intrepid Technologies, LLC., has been operating the first of two PSA Systems supplied by Guild Associates for upgrading biogas at their Whitesides Digester Facility in Idaho. The operation, in the initial one-year time period, has shown the production of pipeline quality gas that meets or exceeds the required specifications.

"We are pleased that this system enabled us to bring the gas to pipeline purity and allow the delivery to an interstate pipeline," said Brad Frazee, Vice-President biomethane operations for Intrepid. “We look forward to future digesters and working with Guild on future projects”.

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Developments in Gas Separation

Guild Associates is pleased to announce the results from its comprehensive field study to upgrade biogas to pipeline quality in its PSA system. Upgrading biogas generated from livestock manure and supplemental feedstocks is growing in popularity as operators realize the potential revenues from the sale of their gas to the pipeline. Guild’s system has been proven to remove contaminants, water, H2S and CO2 in a single, self-contained unit, making it simple and inexpensive for the operator to achieve high purity pipeline-quality natural gas.

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