IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0631127
(2005-06-30)
|
등록번호 |
US-7837758
(2011-01-22)
|
우선권정보 |
NO-20042782(2004-07-01) |
국제출원번호 |
PCT/NO2005/000243
(2005-06-30)
|
§371/§102 date |
20070319
(20070319)
|
국제공개번호 |
WO06/004424
(2006-01-12)
|
발명자
/ 주소 |
- Ingels, Rune
- Rondeau, Xavier
- Ledoux, Francois
|
출원인 / 주소 |
|
대리인 / 주소 |
Wenderoth, Lind & Ponack, L.L.P.
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
▼
Method for the production of solid urea ammonium sulphate (UAS) fertilizers from sulphuric acid, ammonia and urea, wherein free ammonia and/or as carbamate to be decomposed from urea production, is reacted with sulphuric acid without substantially decomposing urea in the process stream, where after
Method for the production of solid urea ammonium sulphate (UAS) fertilizers from sulphuric acid, ammonia and urea, wherein free ammonia and/or as carbamate to be decomposed from urea production, is reacted with sulphuric acid without substantially decomposing urea in the process stream, where after urea and ammonium sulphate (AS) is mixed and particulated. The point of integration of the ammonium sulphate production in the urea production process is chosen according to the desired product composition. The reaction is carried out in a pipe reactor where the head of the reactor enhanced the chemical reaction between sulphuric acid and ammonia and the urea solution surrounds the ammonium sulphate formation.
대표청구항
▼
The invention claimed is: 1. A method for the production of solid urea ammonium sulphate (UAS) fertilizers, which comprises forming urea by reacting CO2 and NH3 in a urea reactor and subsequent carbamate stripper, and forming ammonium sulphate (AS) in situ by reacting H2SO4 and NH3, free and/or as
The invention claimed is: 1. A method for the production of solid urea ammonium sulphate (UAS) fertilizers, which comprises forming urea by reacting CO2 and NH3 in a urea reactor and subsequent carbamate stripper, and forming ammonium sulphate (AS) in situ by reacting H2SO4 and NH3, free and/or as carbamate, in a reactor downstream of the carbamate stripper, wherein liquid effluent, containing urea, from the carbamate stripper is sent to the reactor for forming AS which is supplied with H2SO4 and additional NH3 such that reaction heat from the AS-formation is fully exploited for concentrating the urea and AS-solution, and then the urea and ammonium sulphate (AS) is mixed and particulated to form solid UAS-particles. 2. The method according to claim 1, wherein the point of integration of ammonium sulphate production in the urea production process is chosen according to the desired product composition. 3. The method according to claim 1, wherein the reaction is carried out in a pipe reactor where the head of the reactor enhances the chemical reaction between sulphuric acid and ammonia and the urea solution surrounds the ammonium sulphate formation. 4. The method according to claim 3, wherein the pressure drop through the reactor is between 0 and 10 bars and the temperature of the reactor is kept between 120 and 200° C. 5. The method according to claim 1, wherein additional ammonia is fed either through the urea reactor or directly to a pipe reactor to achieve higher content of AS in the UAS. 6. The method according to claim 1, wherein elemental sulphur divided into fine droplets is added to the UAS. 7. The method according to claim 6, wherein the droplets are <50 μm. 8. The method according to claim 6, wherein elemental sulphur is divided into fine droplets before granulation by mixing in the line and coalescence avoided by addition of adequate additive, or directly co-sprayed with UAS in the granulator. 9. The method according to claim 1, which is carried out utilizing an increased throughput of ammonia to increase the formation of urea in the reactor, by using surplus ammonia rich carbamate for the formation of ammonium sulphate, without recycling carbon dioxide to the synthesis. 10. The method according to claim 1, which is carried out utilizing an increased throughput of ammonia to increase the formation of urea in the reactor by using surplus ammonia rich carbamate for the formation of ammonium sulphate, recycling surplus carbon dioxide to the synthesis through an expansion in carbon dioxide compressor capacity. 11. The method according to claim 1, wherein urea solution is flashed in a first separator tank, before liquid urea/carbamate solution is reacted with sulphuric acid in a first pipe reactor, a liquid stream from the separator of the pipe reactor enters a second pipe reactor, where vapour phase from a first separator and sulphuric acid is injected, to produce more UAS, before concentration and particulation. 12. The method according to claim 11, wherein 1-35 weight % AS is produced in the second pipe reactor. 13. The method according to claim 11, wherein the heat of reaction for AS is utilized for concentration of the UAS-solution. 14. The method according to claim 1, wherein a part of a urea/carbamate/water stream from the urea reactor is reacted with sulphuric acid to make UAS-slurry, while carbamate from the other part of the stream is decomposed, the resulting urea solution concentrated and mixed with the other stream before particulation of UAS. 15. The method according to claim 14, wherein the stream is divided ⅓-⅔ to ⅔-⅓ or in any proportion between these values. 16. The method according to claim 14, wherein a vapour phase from the carbamate decomposition is supplied to the pipe reactor. 17. The method according to claim 14, wherein the heat of reaction for AS and vapour pressure control in the pipe reactor separator allows concentration of the UAS solution. 18. The method according to claim 7, wherein the droplets are 10-25 μm. 19. A method for the production of solid urea ammonium sulphate (UAS) fertilizers, which comprises forming urea by reacting CO2 and NH3 in a urea reactor and subsequent carbamate stripper, and forming ammonium sulphate (AS) in situ by reacting H2SO4 and NH3, free and/or as carbamate, in a reactor downstream of the carbamate stripper, wherein liquid effluent, containing urea, from the carbamate stripper is sent to the reactor for forming AS which is supplied with H2SO4 and additional NH3 such that reaction heat from the AS-formation is fully exploited for concentrating the urea and AS-solution, and then the urea and ammonium sulphate (AS) is mixed and particulated to form solid UAS-particles, which method is carried out utilizing an increased throughput of ammonia to increase the formation of urea in the reactor, by increasing the N/C ratio and extracting surplus ammonia from a water containing carbamate recycle stream for ammonium sulphate formation.
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