Dehydration with Triethylene Glycol (TEG) is the most common method to meet natural gas water content requirements. Aromatic compounds such as benzene, toluene, ethylbenzene, and xylenes (BTEX) are slightly soluble in TEG, and as a result is absorbed in the glycol contactor. Additionally, methane and other volatile organic compounds (VOCs) will be entrained in the rich glycol due to the high operating pressure in the glycol contactor.
The rich glycol is regenerated using a flash tank and glycol reboiler. Flash gas liberated from the flash tank contains mostly methane, some VOCs, and small amounts of BTEX. The thermal regeneration in the glycol reboiler causes methane, VOCs and HAPs to be released with the water vapor exiting the still column vent.
ProMax is the only process simulator approved by the EPA for estimating emissions from glycol dehydration units under 40 CFR 63 Subpart HH. Now you can estimate emissions using the same software trusted to design and operate thousands of dehydration facilities. See the full approval letter using the link below.
ALT-147 Approval to use ProMax as an Alternative to GLYCalc under 40 CFR Part 63, Subpart HH (pdf)
The ProMax Dehydration Tool allows you to model several facilities at a time from a familiar Excel interface. The tool is flexible and allows you to accurately model a variety of facility designs including:
Watch the Dehydration Tool YouTube Tutorial
Wet natural gas streams at low temperatures are at risk of forming hydrates and methanol is often injected into the wet gas to suppress hydrates upstream of the glycol dehydrator. ProMax is the only process simulator capable of accurately estimating the methanol emissions from a glycol dehydrator.