PROCESS FOR PRODUCING AMMONIA AND SULFURIC ACID FROM A STREAM COMPRISING AMMONIUM SULFATE
First Claim
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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Accused Products
Abstract
A process for producing ammonia and sulfuric acid from a stream comprising ammonium sulfate is provided. The process comprises the steps of heating the stream to produce ammonia and a decomposition product comprising one or more than one of a bisulfate salt, a pyrosulfate salt, or a combination thereof. The ammonia produced is recovered, and water is added to the decomposition product to produce a stream comprising the decomposition product. The stream comprising the decomposition product is processed by acid retardation to obtain a sulfuric acid stream and a stream comprising one or more than one sulfate salt.
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Citations
22 Claims
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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:
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(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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification