Cryogenic rectification process for producing ultra high purity nitrogen

Patent · Tue Feb 20 04:00:00 EST 1990

OSTI ID:6834683

Cheung, H

This patent describes a process for producing ultra high purity nitrogen. It comprises: introducing compressed feed air into a cryogenic rectification zone; separating the compressed feed air by cryogenic rectification to produce higher pressure nitrogen-rich vapor containing lower boiling impurities; partially condensing nitrogen-rich vapor to produce nitrogen-richer liquid and vapor enriched with lower boiling impurities; expanding the nitrogen-richer liquid to produce lower pressure nitrogen-richer fluid; passing the resulting lower pressure nitrogen-richer fluid in indirect heat exchange with the nitrogen-rich vapor to carry out the partial condensation and to produce nitrogen-richer vapor.

• Assignee: Union Carbide Corp., Danbury, CT
• Patent Number(s): A; US 4902321
• Application Number: PPN: US 7-324444A
• OSTI ID: 6834683
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
AIR
COMPRESSED AIR
COMPRESSED GASES
CRYOGENICS
ELEMENTS
EVAPORATION
FLUIDS
GASES
NITROGEN
NONMETALS
PHASE TRANSFORMATIONS
PRODUCTION
PURIFICATION
SEPARATION EQUIPMENT
SEPARATION PROCESSES