![]() Nitrogen rejection by PVSA allows a higher tolerance to the contaminant levels over CD. The PVSA unit preferentially adsorbs N 2 based upon kinetic selectivity of the carbon molecular sieve. In the current study, the conventional nitrogen removal unit (NRU) using CD is compared to the use of an optimized 9-step pressure vacuum swing adsorption (PVSA) detailed process model employing a Takeda carbon molecular sieve as the adsorbent. ![]() At such a low temperature, significant pre-treatment of the feed gas is required to prevent hydrate formation, solidification of CO 2 and heat exchanger corrosion damage from mercury. ![]() Operation of the CD unit occurs at approximately 40 bar and − 120 ☌, provided by a suitable refrigeration system. The conventional process employed for the removal of N 2 in a natural gas upgrading facility is cryogenic distillation (CD) and entails a significant investment outlay.
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