January 2010

Special Report: Gas Processing Developments

Advanced mercury removal technologies

New technologies can cost-effectively treat 'wet' and 'dry' natural gas while protecting cryogenic equipment

Eckersley, N., UOP LLC, a Honeywell Company

Mercury is present in many of the world's natural gas fields. Process plants with brazed aluminum heat exchangers, including liquefied natural gas (LNG) facilities and nitrogen-rejection units, are particularly susceptible to corrosive attack by mercury. More awareness on the part of gas processors is necessary to assure better protection of their assets and to address environmental concerns by removing mercury. At present, mercury levels have increased from 30 µg/Nm3 or 40 µg/Nm3 to levels exceeding 1,000 µg/Nm3 in the Pacific Rim. Processing solutions In supplying purification solutions to the gas-processing industry, a number of approaches for mercury removal have been

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