Method to deliver ultra high purity helium gas to a use point

Patent · Tue Aug 30 04:00:00 EDT 1988

OSTI ID:6661037

Graczk, L S; Francis, A W

This patent describes a method to deliver helium gas to a use point comprising: (A) providing gaseous helium from a high pressure cylinder or tube into a storage container containing liquid helium; (B) passing the gaseous helium in heat exchange relation with the liquid helium to: (i) vaporize liquid helium, (ii) increase or maintain the helium pressure, and (iii) condense and/or solidify impurities out of the gaseous helium; (C) withdrawing ultra high purity helium gas comprising resulting vaporized helium and cleaned gaseous helium from the storage container; and (D) providing ultra high purity helium gas to a use point without need for further pressurization, the helium gas containing less than 10 ppm impurities.

• Assignee: Union Carbide Corp., Danbury, CT
• Patent Number(s): US 4766731
• OSTI ID: 6661037
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CONTAINERS
CONTROL
ELEMENTS
EVAPORATION
FLUID FLOW
FLUIDS
GAS FLOW
GASES
HEAT EXCHANGERS
HELIUM
LIQUEFIED GASES
LIQUID FLOW
NONMETALS
PHASE TRANSFORMATIONS
PRESSURE CONTROL
PURIFICATION
RARE GASES
STORAGE
TRANSPORT
WORKING FLUIDS