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 sulfate salt selected from the group consisting of bisulfate salt, 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 chemical selected from the group consisting of sulfate salt, bisulfate salt, sulfuric acid and 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),wherein the first stream comprising ammonium sulfate originates from a stream produced by pretreatment of a lignocellulosic feedstock with sulfuric acid and wherein sulfate present in the stream comprising ammonium sulfate originates, in whole or in part, from sulfuric acid added during said pretreatment.
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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.
16 Citations
53 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 sulfate salt selected from the group consisting of bisulfate salt, 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 chemical selected from the group consisting of sulfate salt, bisulfate salt, sulfuric acid and 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), wherein the first stream comprising ammonium sulfate originates from a stream produced by pretreatment of a lignocellulosic feedstock with sulfuric acid and wherein sulfate present in the stream comprising ammonium sulfate originates, in whole or in part, from sulfuric acid added during said pretreatment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. 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 sulfate salt selected from the group consisting of bisulfate salt, 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 chemical selected from the group consisting of sulfate salt, bisulfate salt, sulfuric acid and 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), wherein the first stream comprising ammonium sulfate originates from a stream produced by pretreatment of a lignocellulosic feedstock with ammonia and wherein ammonia present in the stream comprising ammonium sulfate originates, in whole or in part, from ammonia added during said pretreatment. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. 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 sulfate salt selected from the group consisting of bisulfate salt, 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 chemical selected from the group consisting of sulfate salt, bisulfate salt, sulfuric acid and 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), wherein the first stream comprising ammonium sulfate originates from a stream produced by acid hydrolysis of a lignocellulosic feedstock with sulfuric acid and wherein sulfate present in the stream comprising ammonium sulfate originates, in whole or in part, from sulfuric acid added during said acid hydrolysis. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. 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 sulfate salt selected from the group consisting of bisulfate salt, 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 chemical selected from the group consisting of sulfate salt, bisulfate salt, sulfuric acid and 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), wherein the second stream has a dissolved solids concentration of about 25 g/L to about 500 g/L. - View Dependent Claims (51)
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52. 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 pyrosulfate salt, which pyrosulfate salt is selected from the group consisting of ammonium pyrosulfate, potassium pyrosulfate, sodium pyrosulfate, magnesium pyrosulfate, calcium pyrosulfate 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 chemical selected from the group consisting of sulfate salt, bisulfate salt, sulfuric acid and 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 (53)
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Specification