Ionic liquid piston compressor

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Piston Compressor

An ionic liquid piston compressor, ionic compressor or ionic liquid piston pump is a hydrogen compressor based on an ionic liquid piston instead of a metal piston as in a piston-metal diaphragm compressor.[1]

Principle[edit]

The ionic compressor exploits some gases' insolubility in ionic liquids - the virtually non-measurable vapor pressures in combination with a large temperature window for the liquid phase. The solubility of hydrogen in ionic liquids is very low. This insolubility is exploited by using a body of ionic liquid to compress hydrogen up to 450 bar[2] in hydrogen filling stations; and in so doing they reduced the number of moving parts from about 500 in a conventional reciprocating compressor down to 8.[3]

Many seals and bearings were removed in the design as the ionic liquid does not mix with the gas. Service life is about 10 times longer than a regular reciprocating compressor with reduced maintenance during use, energy costs are reduced by as much as 20%. The heat exchangers that are used in a normal piston compressor are removed as the heat is removed in the cylinder itself where it is generated. Almost 100% of the energy going into the process is being used with little energy wasted as reject heat.[4]

Not to be confused with the ion pump or the ionic liquid ring pump.

History[edit]

After the renewed interest in ionic liquids, research was done by proionic, an enterprise in the spin-off center "ZAT Center for applied Technology" of the University of Leoben.[5][6] The system was demonstrated at Zemships.[7]

See also[edit]

References[edit]

  1. ^ New developments in pumps and compressors using Ionic Liquids
  2. ^ Zemships - Ionic liquid compression
  3. ^ Ionic liquid compressor
  4. ^ Linde Develops Ionic Compressor for More Efficient Compressed Hydrogen Storage
  5. ^ University of Leoben: Spin-off creates innovation for compression of gas
  6. ^ Mobility under high pressure Pag-38
  7. ^ Construction and design of hydrogen filling stations