PURASPEC processes remove low levels of sulfur and mercury compounds from hydrocarbon gases and liquids to meet pipeline, chemical grade or environmental specifications.
PURASPEC uses absorbent fixed beds to irreversibly react with impurities to be removed. There are no feedstock losses; only the impurity binds within the absorbent. The process is flexible to accommodate changes in throughput. There is no operator intervention required to run the process and change-out can be done by contract labor.
During operation, there are no vents, flares or noise sources. Used absorbent can be reprocessed and disposed in an environmentally friendly manner. A typical lead-lag configuration is shown. However, single vessels are operated and have been used to phase expenditure. Axial and radial flow reactor designs are available. Radial flow reactors have been used in duties where a very low-pressure drop is required. Hydrogen sulfide (H2S) removal from natural and associated gas can achieve impurity levels a low as ppbv at the bed exit. In liquid duties (propane and liquefied petroleum gas), H2S is removed to meet copper strip 1A quality.
Mercury can be removed from natural gas to levels below 10 ng/Nm3 (liquefied natural gas quality). In liquid duties (propane, butane, naphthas) mercury can be reduced to <1 ppbw. Operating conditions: PURASPEC operates effectively over wide temperature and pressure ranges from 20°F to 400°F and atmospheric to 2,000 psi. No heat input is required. Licensor: Johnson Matthey Catalysts