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Method for the adsorptive drying of purified biogas and for regenerating laden adsorbents

  • US 8,747,522 B2
  • Filed: 03/08/2011
  • Issued: 06/10/2014
  • Est. Priority Date: 03/12/2010
  • Status: Active Grant
First Claim
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1. A gas drying process, comprising:

  • providing a purified biogas having a methane content of at least 90% by volume;

    providing an adsorber with adsorbents in the form of separate layers based on silica gel and molecular sieves;

    adsorptively drying the purified biogas with the adsorbents and regenerating laden adsorbents in a closed biogas circuit; and

    conducting the biogas to be dried first through a layer of silica gel, and wherein regenerating further comprises regenerating the adsorbent using exclusively heated dried biomethane having a temperature of up to 150°

    C. and, after contact with the adsorbent, recycling the biomethane back into a starting stream of the purified biogas; and

    on completion of regeneration, contacting cooled dried biomethane with the adsorbent and recycling back into the starting stream of the purified biogas, and conducting methane-containing water obtained during the drying and regeneration back to a biogas production and/or purification.

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