Regenerative Solution
HgSIV adsorbents are unique products developed by UOP for mercury management in natural gas, LNG and ethylene plants and have been used commercially for more than 20 years. They contain silver which forms an amalgam with the mercury. Since mercury is adsorbed on different sites than water, HgSIV adsorbent adsorbs both simultaneously and can be used to replace a portion of the dehydration grade molecular sieve in the dryers. Since HgSIV adsorbents are used in the existing vessels, no additional capital is required and no additional pressure drop encountered. The beds are completely regenerable, transferring the mercury and water to the regeneration gas, shown in Figure 2. Recovery of mercury form the spent regeneration gas can be done with a small MRU.
Use of HgSIV adsorbents enable the flexibility to switch between mercury-laden as well as mercury-free feed stocks. It can easily be used in the dehydration beds of units which were not originally designed for mercury containing feed gas.
Mercury can be removed during different stages of your process depending on several factors, including inlet gas composition and flow rate, inlet mercury levels, site environmental concerns and available capital budget. Please contact UOP and allow us to help you understand the best options for mercury removal in your plant.