Removal of hydrogen cyanide from synthesis gas
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/14
C01C-003/02
C07C-253/00
출원번호
US-0513077
(2007-10-29)
등록번호
US-8128898
(2012-03-06)
우선권정보
ZA-2006/09076 (2006-10-31)
국제출원번호
PCT/IB2007/054378
(2007-10-29)
§371/§102 date
20090813
(20090813)
국제공개번호
WO2008/053421
(2008-05-08)
발명자
/ 주소
Van Dyk, Braam
Marriott, John
Pillay, Bavanethan
Van Der Westhuizen, Hendrik Johannes
Combrink, Ronél
Phillips, Trevor David
Venter, Denise Louisette
Steynberg, André´ Peter
출원인 / 주소
Sasol Techonology (Proprietary) Limited
대리인 / 주소
Pillsbury Winthrop Shaw Pittman LLP
인용정보
피인용 횟수 :
5인용 특허 :
7
초록▼
A process (10) for at least partially removing hydrogen cyanide from synthesis gas includes feeding a synthesis gas (30) containing hydrogen cyanide to a gas-liquid contacting stage (18) and, in the gas-liquid contacting stage (18), contacting the synthesis gas with an aqueous washing solution (36)
A process (10) for at least partially removing hydrogen cyanide from synthesis gas includes feeding a synthesis gas (30) containing hydrogen cyanide to a gas-liquid contacting stage (18) and, in the gas-liquid contacting stage (18), contacting the synthesis gas with an aqueous washing solution (36) comprising at least one dissolved metal salt, with metal cations of the metal salt being capable of forming metal cyanide complexes and/or metal cyanide precipitates, and weak acid anions of the metal salt serving to buffer the pH of the washing solution in a range between 6 and 10. Hydrogen cyanide is washed from the synthesis gas by the washing solution to form a treated synthesis gas (38) and a spent washing solution (40). From time to time or continuously, at least a portion of the spent washing solution is withdrawn from the gas-liquid contacting stage. The treated synthesis gas (38) is also withdrawn from the gas-liquid contacting stage.
대표청구항▼
1. A process for at least partially removing hydrogen cyanide from synthesis gas to be used for Fischer-Tropsch synthesis and which includes carbon dioxide, the process including: feeding a synthesis gas containing hydrogen cyanide to a gas-liquid contacting stage;in the gas-liquid contacting stage,
1. A process for at least partially removing hydrogen cyanide from synthesis gas to be used for Fischer-Tropsch synthesis and which includes carbon dioxide, the process including: feeding a synthesis gas containing hydrogen cyanide to a gas-liquid contacting stage;in the gas-liquid contacting stage, contacting the synthesis gas with an aqueous washing solution comprising at least one dissolved metal salt, with metal cations of the metal salt being capable of forming metal cyanide complexes and/or metal cyanide precipitates, and weak organic acid anions of the metal salt serving to buffer the pH of the washing solution in a range between 6 and 10, the washing solution including metal salts in a concentration in a range of 1 to 20 mass %, with hydrogen cyanide being washed from the synthesis gas by the washing solution to form a treated synthesis gas and a spent washing solution;withdrawing, from time to time or continuously, at least a portion of the spent washing solution from the gas-liquid contacting stage; andwithdrawing the treated synthesis gas from the gas-liquid contacting stage. 2. The process as claimed in claim 1, in which the washing solution includes metal salts in a concentration in a range of 1 to 10 mass %. 3. The process as claimed in claim 1, in which the concentration of the metal cations capable of forming metal cyanide complexes and/or metal cyanide precipitates in the washing solution is in the range of 0.1 to 4 mass % and the concentration of the weak organic acid anions in the washing solution is in the range of 0.5 to 8 mass %. 4. The process as claimed in claim 1, in which the metal salts include one or more iron-, copper-, cobalt-, silver-, gold-, and/or other transition metal salts. 5. The process as claimed in claim 1, in which the weak organic acid anions are derived from carboxylates selected from the group consisting of citrate, oxalate, acetate, and propionate. 6. The process as claimed in claim 1, in which the gas-liquid contacting stage is operated at a temperature between 40° C. and 200° C. 7. The process as claimed in claim 6, in which the temperature is between 45° C. and 70° C. 8. The process as claimed in claim 1, which includes preparing fresh washing solution in a washing solution preparation stage, the fresh washing solution being prepared by passing an aqueous solution containing weak organic acids over a high surface area source of metal, thereby to form the dissolved metal salts by reaction. 9. The process as claimed in claim 8, in which the aqueous solution containing weak organic acids is, or is derived from, Fischer-Tropsch reaction water product. 10. The process as claimed in claim 1, in which the synthesis gas includes condensable hydrocarbon components, the process including condensing at least some of the condensable hydrocarbon components in the gas-liquid contacting stage, forming a hydrocarbon condensate, andwithdrawing the hydrocarbon condensate from the gas-liquid contacting stage.
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이 특허에 인용된 특허 (7)
Kurek Paul R. ; Kalnes Tom N. ; Lewis Gregory John, Oxidative removal of aqueous cyanide by manganese(IV)-containing oxides.
Warner, R. Jay; Murphy, Carl David; Robelo Grajales, Gustavo Angel; Sanchez Santiago, Francisco Javier; Solorzano, Fernando Alejo; Torres, Jose Alfonso, Process for the simultaneous coproduction and purification of ethyl acetate and isopropyl acetate.
Hickey, Robert; Du, Jianxin; Reeves, Andrew; Tobey, Richard E., Processes for the anaerobic bioconverison of syngas to oxygenated organic compound with in situ protection from hydrogen cyanide.
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