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PROCESS FOR PRODUCING AMMONIA AND SULFURIC ACID FROM A STREAM COMPRISING AMMONIUM SULFATE

  • US 20080056983A1
  • Filed: 08/29/2007
  • Published: 03/06/2008
  • Est. Priority Date: 08/31/2006
  • Status: Active Grant
First Claim
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1. A process for producing ammonia and sulfuric acid from a first stream comprising ammonium sulfate, the process comprising the steps of:

  • (i) heating the first stream comprising ammonium sulfate thereby producing ammonia and a decomposition product comprising a sulfate salt selected from the group consisting of bisulfate salt, a pyrosulfate salt and a combination thereof;

    (ii) recovering the ammonia produced in step (i);

    (iii) adding water to the decomposition product produced in step (i) to produce a second stream comprising a sulfate salt, a bisulfate salt, sulfuric acid or a combination thereof;

    (iv) separating sulfate salt from sulfuric acid in the second stream produced in step (iii) to obtain a third stream comprising sulfuric acid and a fourth stream comprising one or more than one sulfate salt, wherein said separating comprises acid retardation; and

    (v) recovering the sulfuric acid obtained in step (iv).

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