[특허]Multi-component removal in flue gas by aqua ammonia

Multi-component removal in flue gas by aqua ammonia 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01D-053/50 B01D-053/56 B01D-053/62 B01D-053/68
출원번호	US-0664950 (2003-09-22)
등록번호	US-7255842 (2007-08-14)
발명자 / 주소	Yeh,James T. Pennline,Henry W.
출원인 / 주소	United States of America Department of Energy
인용정보	피인용 횟수 : 59 인용 특허 : 17

초록 ▼

A new method for the removal of environmental compounds from gaseous streams, in particular, flue gas streams. The new method involves first oxidizing some or all of the acid anhydrides contained in the gas stream such as sulfur dioxide (SO2) and nitric oxide (NO) and nitrous oxide (N2O) to sulfur trioxide (SO3) and nitrogen dioxide (NO2). The gas stream is subsequently treated with aqua ammonia or ammonium hydroxide which captures the compounds via chemical absorption through acid-base or neutralization reactions. The products of the reactions can be collected as slurries, dewatered, and dried for use as fertilizers, or once the slurries have been dewatered, used directly as fertilizers. The ammonium hydroxide can be regenerated and recycled for use via thermal decomposition of ammonium bicarbonate, one of the products formed. There are alternative embodiments which entail stoichiometric scrubbing of nitrogen oxides and sulfur oxides with subsequent separate scrubbing of carbon dioxide.

대표청구항 ▼

We claim: 1. A process for removing acid anhydrides precursors and other acid moieties from flue gases, the process comprising: a) cooling the flue gases containing CO2, acid anhydride precursors and other acid moieties; b) removing particulate matter from the flue gases; c) oxidizing the acid anhydrides precursors to oxidized anhydrides, wherein the acid anhydrides precursors are selected from the group consisting of SO2 and NOx, and the acid moieties are selected from the group consisting of HCl, HF and hydrogen halides; d) simultaneously converting the oxidized anhydrides precursors and the other acid moieties to ammonia salts by reaction with ammonia-containing compounds; e) subsequently converting CO2 to an ammonia salt by reaction with aqua ammonia; and f) collecting the ammonia salts from steps d) and e). 2. The process as recited in claim 1 wherein gaseous anhydrides are oxidized to higher gaseous acid anhydrides. 3. The process as recited in claim 1 wherein the ammonia-containing compounds are water-soluble compounds selected from the group consisting of aqueous ammonia, ammonium hydroxide, ammonium carbonate, ammonium carbamate, and combinations thereof. 4. The process as recited in claim 1 wherein the ammonia salt obtained in step e) is ammonium bicarbonate and said ammonium bicarbonate is decomposed to generate a gas mixture comprising CO2 and NH3 or CO2 and (NH4)2CO3. 5. The process as recited in claim 1 wherein the process is carried out at temperatures of from about 15째 C. to 50째 C. 6. The process as recited in claim 4 wherein the regeneration is carried out at a temperature from about 35째 C. to 80째 C. 7. The process as recited in claim 4 wherein ammonia and ammonia-containing compounds generated from the decomposition of ammonium bicarbonate are recycled for use in the conversion step. 8. The process as recited in claim 1 wherein the other acid moieties are hydrogen halides. 9. The process of claim 1 further comprising the step of decomposing the ammonia salt obtained in step e).

이 특허에 인용된 특허 (17)

Bhat Pervaje A. (North Canton OH) Johnson Dennis W. (Barberton OH), Ammonia-limestone scrubbing with by-product for use in agriculture.
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Hammer, Michael T.; Mengel, Michael L., Flue gas desulfurization process and apparatus for removing nitrogen oxides.
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Gansley Raymond R. ; Mengel Michael L., Flue gas scrubbing method and apparatus therefor.
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Amrhein Gerald T. (Louisville OH) Vecci Stanley J. (Alliance OH) Rackley John M. (Alliance OH), Furnace ammonia and limestone injection with dry scrubbing for improved simultaneous SOX and NO.
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Masahiro Izutsu JP; Akiko Yokoyama JP; Yoshitaka Iizuka JP; Ryoji Suzuki JP, Method for producing a fertilizer from gas containing sulfur oxides.
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Bechthold Horst (Erftstadt-Friesheim DEX) Fischer Heinz J. (Neunkirchen-Seelscheid DEX) Schulte Wolfgang (Monheim DEX), Method for removing nitrogen oxides from waste gases.
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Haese Egon (Bochum DEX) Moll Hans (Marl DEX) Willms Rolf (Bochum DEX), Process and apparatus to purify waste industrial gases.
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Gal Eli (Lititz PA), Process for reduction of sulfur dioxide emission from combustion gases combined with production of potassium sulfate.
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Coq Bernard,FRX ; Delahay Gerard,FRX ; Fajulas Francois,FRX ; Neveu Bernard,FRX ; Peudpiece Jean-Bernard,FRX ; Kieger Stephane,FRX, Process for the removal from gases of nitrogen oxides NOx by selective catalytic reduction (SCR) using ammonia over zeolite catalysts not causing the formation of nitrogen protoxide.
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Longo John M. (New Providence NJ) Cull Neville L. (Baker LA), Process for the removal of SOx and NOx from gaseous mixture containing the same.
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Hwang Shuen-Cheng ; Saxena Neeraj ; Anderson Mark H. ; Ferrell Robert James, Reduction of toxic substances in waste gas emissions.
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Cooper Hal B. H. (4234 Chevy Chase Dr. La Canada Flintridge CA 90017), Removal and recovery of nitrogen oxides and sulfur dioxide from gaseous mixtures containing them.
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Emmer Wayne W. (7921 Kerrybrooke Trail Poland OH 44514), Removal of sulfur oxides from waste gases by scrubbing with an aqueous slurry of finely comminuted limestone.
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연합인증

Multi-component removal in flue gas by aqua ammonia 원문보기

초록 ▼

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이 특허를 인용한 특허 (59)

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Multi-component removal in flue gas by aqua ammonia 원문보기

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연구과제 타임라인

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