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Process for the distillation of weak ammonia liquor

  • US 4,108,734 A
  • Filed: 06/14/1976
  • Issued: 08/22/1978
  • Est. Priority Date: 06/14/1976
  • Status: Expired due to Term
First Claim
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1. An improved method of removing both free and fixed ammonia from weak ammonia liquor derived from a coal coking operation while reducing calcium solids accumulation in the still apparatus comprising:

  • (a) premixing ammonia liquor which contains both substantial free ammonia as ammonium carbonate, ammonium sulfide and ammonium cyanide and fixed ammonia as ammonium chloride, ammonium thiocyanate and ammonium sulfate, prior to initiating any removal of said ammonia by distillation, with lime to pre-precipitate lime compounds from the undistilled liquor,(b) clarifying the weak ammonia liquor by removing substantially all precipitated lime compounds and undissolved lime from the undistilled liquor, and(c) passing the pre-precipitated and clarified ammonia liquor into and through an ammonia still countercurrently with a heated gas to strip ammonia from said liquor.

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