Method for regenerating iron-loaded denox catalysts
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-038/60
B01J-038/00
B01J-023/92
B01J-023/90
출원번호
UP-0526336
(2003-09-04)
등록번호
US-7569506
(2009-08-24)
우선권정보
DE-102 41 004(2002-09-05)
국제출원번호
PCT/EP03/009794
(2003-09-04)
§371/§102 date
20051103
(20051103)
국제공개번호
WO04/022226
(2004-03-18)
발명자
/ 주소
Foerster, Marcel
출원인 / 주소
CESI Tech Technologies, Inc.
대리인 / 주소
Womble Carlyle
인용정보
피인용 횟수 :
13인용 특허 :
7
초록▼
The invention relates to a method for regenerating DeNOx catalysts having an increased SO2/SO3 conversion rate as a result of the cumulation of iron compounds, and is characterized in that the catalysts are treated with an essentially aqueous acid solution, preferably having a pH between 0.5 and 4,
The invention relates to a method for regenerating DeNOx catalysts having an increased SO2/SO3 conversion rate as a result of the cumulation of iron compounds, and is characterized in that the catalysts are treated with an essentially aqueous acid solution, preferably having a pH between 0.5 and 4, and with an addition of antioxidants.
대표청구항▼
The invention claimed is: 1. A method for regenerating denox catalyst having an accumulation of iron compounds thereon, comprising the steps of: treating the denox catalyst with a substantially aqueous acidic solution with an addition of at least one antioxidant, wherein at least one inorganic or o
The invention claimed is: 1. A method for regenerating denox catalyst having an accumulation of iron compounds thereon, comprising the steps of: treating the denox catalyst with a substantially aqueous acidic solution with an addition of at least one antioxidant, wherein at least one inorganic or organic acid is used to confer acidity and the at least one acid is selected from the group consisting of H2SO4, HCl, H3PO4, HNO3, oxalic acid, citric acid, malonic acid, formic acid, chloroacetic acid, and benzene sulfonic acid, and the at least one antioxidant is selected from the group consisting of substituted phenols, hydroquinones, catechols, aliphatic mercapto compounds, araliphatic mercapto compounds, aromatic mercapto compounds, dithiocarbonates, hydroxycarboxylic acids, enediols, phosphites, and phosphonates, including salts, esters and metal complexes thereof; and removing at least a portion of the iron compounds accumulated on the denox catalyst so as to regenerate the denox catalyst. 2. The method according to claim 1, wherein the aqueous acidic solution has a pH of 0.5 to 4.0. 3. The method according to claim 1, wherein the aqueous acidic solution contains at least one enediol selected from the group consisting of ascorbic acid and isoascorbic acid. 4. The method according to claim 1, wherein the aqueous acidic solution contains at least one anionic, cationic, amphoteric, non-ionic or zwitterionic surfactant. 5. The method according to claim 1, wherein the antioxidant content is 0.2 to 2.0 wt. %. 6. The method according to claim 1, wherein treatment is at a temperature of from ambient temperature to 100° C. 7. The method according to claim 1, further comprising moving the catalyst, the solution, or both, during treating. 8. The method according to claim 7, wherein the catalyst is moved by lifting, the solution is moved by agitation or recirculation, or both the catalyst and solution are moved by lifting and agitation or recirculation, respectively. 9. The method according to claim 1, further comprising treating the catalyst with an ultrasonic treatment or treating the catalyst with low-frequency oscillations in the solution or both. 10. The method according to claim 9, wherein the catalyst is treated with a low-frequency oscillation in a range from approximately 20 to 1000 Hz or ultrasound in a range from 10,000 to 100,000 Hz. 11. The method according to claim 9, wherein the treatment with solution and the ultrasonic treatment are carried out successively in separate basins. 12. The method according to claim 1, further comprising subjecting the catalyst to a mechanical pretreatment so as to remove dust, subjecting the catalyst to a pretreatment with water, or both. 13. The method according to claim 1, further comprising, after the treatment with solution, washing the catalyst with water, and drying the catalyst. 14. The method according to claim 13, further comprising, after drying, re-impregnating activator elements into the denox catalyst.
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이 특허에 인용된 특허 (7)
Young Donald C. (245 Altura Dr. Fullerton CA 92635), Demetallizing organometallic compounds using sulphuric acid-urea adducts.
Friesen Dwayne T. ; Babcock Walter C. ; Edlund David J. ; Lyon David K. ; Miller Warren K., Liquid absorbent solutions for separating nitrogen from natural gas.
Trinh Dinh Chan (Le Vesinet FRX) Desvard Alain (Elancourt FRX) Martino Germain (Poissy FRX), Process for regenerating used catalysts by means of hydrogen peroxide aqueous solution stabilized with an organic compou.
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