Nitrogen membrane separators can typically produce nitrogen at purities up to 99 5 while psa nitrogen generators can achieve purities up to 99 9995. Apsa technology air liquide s apsa offers a low cost reliable flexible and efficient means to deliver consistent high quality gaseous nitrogen with cryogenic purity. But in most cases they do not produce more than 98 8 nitrogen with the remainder being argon that is not separated from the nitrogen by the usual psa process.
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