yes, I know that, it is the cheapest mostly-inert gas.....I am saying that *if* the JBII system uses a N2 purge to displace ambient air (which I expect, since it is said to not use vacuum), the N2 must later be removed somehow, and not be too high a % of the off-gas.....
Problem Nitrogen is a common contaminant in natural gas and is quite difficult to remove. Nitrogen lowers the BTU value of the gas and makes it unsaleable to most pipelines. Natural gas will be accepted for transport by pipeline only if it contains less than a specified amount of nitrogen, typically somewhere between 4% and 6%. Cryogenic nitrogen removal is complex and prohibitively expensive at modest scale. MTR’s membrane based NitroSep™ system is a proven and economical solution.