Patent ID: 6502404
Filing Date: 2003-01-07
Classification: F25B,F25J,Y02B,Y10S

Abstract:
A method for carrying out cryogenic rectification comprising:(A) passing feed into a double column cryogenic rectification plant comprising a higher pressure column and a lower pressure column; (B) magnetizing a bed of magnetizable particles to heat the magnetizable particles, heating refrigerator gas by contacting the refrigerator gas with the magnetized particles, cooling the heated refrigerator gas, demagnetizing the bed of magnetizable particles, and passing cooled refrigerator gas in contact with the demagnetized particles to produce cooled refrigerator gas containing refrigeration; (C) withdrawing vapor from the higher pressure column, condensing the withdrawn vapor by indirect heat exchange with cooled refrigerator gas, and passing the resulting condensed liquid into at least one of the higher pressure column and the lower pressure column; and (D) separating the feed by cryogenic rectification within the cryogenic rectification plant using refrigeration from the refrigerator gas.