Patent ID: 6276168
Filing Date: 2001-08-21
Classification: B01D,C01B,Y10S

Abstract:
A process for recovering NF.sub.3 from a multicomponent fluid containing NF.sub.3 having a first volatility, one or more components less volatile than NF.sub.3, and one or more components more volatile than NF.sub.3, said process using a first distillation column and a second distillation column, each distillation column having a top and a bottom, comprising the steps of:feeding said multicomponent fluid to said first distillation column at a first feed location;feeding a cryogenic liquid to said first distillation column at a location above said first feed location;removing said components more volatile than NF3 from the top of said first distillation column;withdrawing a mixture containing NF3 and said components less volatile than NF3 from said first distillation column at a location below said feed location;feeding said mixture to said second distillation column at a second feed location;separating NF3 from said mixture in said second distillation column; andremoving a stream of NF3 from the top of said second distillation column.