| 摘要 |
Producing ultra-high purity liquid oxygen from standard grade liquid oxygen comprises: (a) pressurising a source of liquid nitrogen; (b) vaporising at least a portion of the liquid nitrogen to form a high pressure gaseous nitrogen stream; (c) introducing the standard grade liquid oxygen to a high purity liquid oxygen unit for purifying the standard grade liquid oxygen into ultra high purity liquid oxygen; (d) introducing the high pressure gaseous nitrogen stream to at least one bottom reboiler/condenser of the high purity liquid oxygen unit for providing heat to the high purity liquid oxygen unit and to form a nitrogen condensate stream; (e) introducing the nitrogen condensate stream to at least one top reboiler/condenser of th high purity liquid oxygen unit for providing refrigeration to the high purity liquid oxygen unit and to form a reduced pressure gaseous nitrogen stream; (f) introducing the reduced pressure gaseous nitrogen stream to a nitrogen purification unit; and (g) withdrawing from the high purity liquid oxygen unit: (i) the ultra- high purity liquid oxygen; (ii) an argon-enriched waste stream; and (iii) a hydrocarbon-enriched waste stream. |
