×

Method for the selective removal and recovery of ammonia from ammonia- and hydrogen sulfide-containing gas mixtures

  • US 4,432,958 A
  • Filed: 01/11/1982
  • Issued: 02/21/1984
  • Est. Priority Date: 01/10/1981
  • Status: Expired due to Fees
First Claim
Patent Images

1. Method for the removal and recovery of ammonia from ammonia- and hydrogen sulfide-containing gas mixtures through a washing with aqueous solutions of ammonium sulfite-bisulfite, comprising washing the gas mixture with an ammonium sulfite-bisulfite solution led in circulation, the surface tension of which solution is reduced to below 80×

  • 10-5 N/cm by addition of a surface active substance, to selectively wash out the ammonia, whereby the surface tension is the more reduced the more hydrogen sulfide is present in said gas mixture and the greater is the desired selectivity of ammonia washing, driving away ammonia gas from the wash solution enriched with ammonia, recovering the released ammonia, and leading the separated wash solution back into the gas wash in circulation.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×