Resources Contact Us Home
Enhanced helium recovery

Image Number 9 for United States Patent #5632803.

The disclosed hybrid membrane and pressure swing adsorption process can recover helium from source streams of about 0.5 to 5 percent by volume helium and concentrate the helium to a concentration of greater than about 98 percent by volume. The process comprises a membrane separation followed by two stages of pressure swing adsorption which are used in series. The source gas will primarily contain hydrocarbons but will contain some nitrogen. The membrane unit will contain a semipermeable membrane which is permeably selective for helium and will to the extent feasible reject hydrocarbons. The permeate gas will be increased in helium content by 2 to 10 times. Part of the residue gas is used in the regeneration of the adsorbent beds in the first stage of pressure swing adsorption. Each stage of pressure swing adsorption will contain a plurality of adsorbent beds, and will be cycled through multiple phases. In the first stage the adsorbent beds will sequentially undergo the phases of adsorption, recycle, depressurization, evacuation, helium pressurization and recycle feed pressurization. The product gas from the first stage is flowed to the second stage and in the second stage sequentially will undergo the phases of adsorption, depressurization, evacuation, purge, and helium pressurization. The offgas from the evacuation and purge in the second stage is flowed to input to the first stage. The process efficiently produces a product stream with a helium content of more than 98 percent by volume.

  Recently Added Patents
Method and system for filtering home-network content
Method and apparatus for controlling power supply
Targeted gene deletions for polysaccharide slime formers
Electromagnetic shield for a passive electronic component in an active medical device implantable lead
Method for determining a corrected variance representative of the condition of reception of signals representative of symbols
Liquid crystal display backlight control
Area reduction for surface mount package chips
  Randomly Featured Patents
Photovoltaic cell having a hetero junction of amorphous silicon carbide and amorphous silicon
Non-slip surface coatings
Output power control and envelope shaping for a pulsed transmitter
Two-stroke internal combustion engine
Method and system for demodulating radio signals
Method and apparatus for multiple recycle polymer dilution
Flexible and fault tolerant networked steering system
Fluid pressure controller
Method and system of adaptive learning for engine exhaust gas sensors
Filter circuit for digital-to-analog converter