SPECIAL REPORT: Extending mole-sieve life depends on understanding how liquids form

Well-designed, monitored, and operated molecular sieve dehydration systems in natural gas processing plants effectively remove moisture for more than 2,000 regeneration cycles. Numerous plants, however, experience moisture breakthrough with newly installed molecular sieve.When good molecular sieve material is used and dehydration problems exist, they commonly result from a few process design oversights not identified during original detail design.Retrograde hydrocarbon condensate by itself or with excessive heat rate during regeneration, stagnant piping traps, and undersized separation tend to be leading causes of chronic molecular sieve underperformance. Elongation of the mass transfer z...

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