Cryogenic rectification process for producing ultra high purity nitrogen

Patent · Tue Feb 20 00:00:00 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): US 4902321; A
• Application Number: PPN: US 7-324444A
• OSTI ID: 6834683
• Resource Relation: Patent File Date: 16 Mar 1989
• Country of Publication: United States
• Language: English

Related Subjects

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