Patent ID: 6035662
Filing Date: 2000-03-14
Classification: F25J,Y02C,Y10S

Abstract:
A process for producing substantially pure carbon dioxide from a carbon dioxide feed containing from about 80 percent to about 98 percent by volume of carbon dioxide, said process comprising:a) distilling the carbon dioxide feed in a distillation column thereby to form a liquid product containing substantially pure carbon dioxide and an overhead vapor stream containing carbon dioxide;b) compressing the overhead vapor stream in a compression stage to form a compressed stream, the overhead vapor stream being compressed to a pressure sufficient to allow a substantial portion of carbon dioxide contained in the overhead vapor stream to be condensed;c) cooling the compressed stream in a heat exchanger into a cooled stream, to cool and partially condense the compressed stream;d) phase separating the cooled stream in a phase separator into a condensate liquid and a residual vapor; ande) returning the condensate liquid to the distillation column to be distilled further in said distilling step.