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  • 专利说明
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  • 优先权
    • 专利摘要:
    1461108 Extraction of nitrates KEMIRA OY 21 Nov 1974 [22 Nov 1973] 50553/74 Heading C1A Nitrates are continuously extracted from aqueous nitrate-containing solutions by (1) contacting the aqueous nitrate solution having a pH of 0 to 7 with an extraction solution containing a chloride salt of a water-insoluble organic amine in solution in a water immiscible organic solvent to effect exchange of the nitrate and chloride ions so that the extraction solution contains the cation of the organic amine and the nitrate anion, (ii) contacting the extraction solution from step (i) with an aqueous stripping reagent having a pH of at least 0À5 and containing KCl salt to effect exchange of nitrate ions and chloride ions so that the stripping solution contains the potassium cation and nitrate anion and the original organic amine salt is reformed in the extraction solution, (iii) maintaining the concentration of the KNO 3 salt in the stripping reagent at a value such that KNO 3 continuously crystallizes from the solution and such that nitrate anions and stripping reagent chloride anions continuously exchange in step (ii) and wherein the extraction solution from step (ii) is recycled to step (i) and the nitrate salt which crystallizes from solution in step (iii) is separated from the solution and a quantity of KCl equivalent to the separated nitrate salt is added to the stripping reagent solution and is recycled to step (ii) and wherein the chloride anion of the organic amine salt passing over into the nitrate containing solution is continuously removed from the treated nitrate containing solution, the latter being then recycled to step (i). The water-insoluble amine may be a primary, secondary or tertiary aliphatic or aromatic amine having one or more alkyl groups containing from 10 to 20 C atoms. The extraction solution may contain an aliphatic or aromatic hydrocarbon and the stripping step (ii) is preferably undertaken at 20‹ to 30‹ C.
    公开号:SU963457A3
    申请号:SU742079506
    申请日:1974-11-21
    公开日:1982-09-30
    发明作者:Калеви Лехто Тимо
    申请人:Кемира Ой (Фирма)；
    IPC主号:
    专利说明:

    (54) METHOD FOR EXTRACTING NITRATES
    The invention relates to a method for the continuous extraction of nitrates from nitrate-containing solutions by extraction and can be used in chemical technology. A method is known for extracting potassium nitrate from nitrate-containing solutions by extracting isoamyl alcohol in an aqueous alcoholic medium l. R are alkyl groups containing from 10 to 20 carbon atoms in an organic solvent and the subsequent stripping of the extractant with saline while maintaining and the concentration of the salt formed by the cation of the stripping salt and the nitrate anion corresponding to the state of supersaturation of its continuous crystallization. As a stripping agent; Potassium nitrate is used and the process is carried out in a strongly acidic medium at a concentration of 4–5 mol / kg and at temperatures from 0 to –20 ° T2l. The disadvantage of this method is to carry out the process at low temperatures using concentrated solutions of nitric acid, as a result of which the industrial implementation of the method is expensive and complicated. In addition, the organic phase at low temperatures becomes highly viscous and low-fluid. The purpose of the invention is a significant simplification of the process. This goal is achieved in that according to the method of extracting nitrates from nitrate-containing solutions, including extracting with a solution of the salt of RR -substituted amine, where R and R are alkyl groups containing 10-20 carbon atoms, in an organic solvent and the subsequent distillation of the extractant with saline while maintaining the concentration a salt formed by a cation of the stripping salt and a nitrate anion, corresponding to the state of displacement and its continuous crystallization; however, the extraction is carried out at a pH of the initial solution of 0-7.0, preferably 1.3-6.0% and from a roll of extractant produced with a saline solution at pH 0.6-2.5.
    权利要求:
    Claims (1)
    [1]
    Claim
    A method for the extraction of nitrates from nitrate-containing solutions, including extraction with a solution of the RR ′ salt of a substituted amine, where R and R ′ are alkyl groups containing 10–20 carbon atoms in an organic solvent and subsequent distillation of the extractant with brine while maintaining the salt concentration formed by the cation of the stripping salt and a nitrate anion corresponding to the state of supersaturation and its continuous crystallization, characterized in that, in order to simplify the process, extraction is carried out at a pH of the initial solution 0-7.0, preferably 1.3-6, 0, and the extractant is distilled off with saline at a pH of 0.6-2.5.
    类似技术:
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    US2622085A|1952-12-16|Recovery of nicotinic acid by solvent extraction
    SU1439081A1|1988-11-23|Method of recovering zinc from chloride solutions
    Jedinakova1983|Some aspects of the separation of nuclear fission products by liquid-liquid extraction
    同族专利:
    公开号 | 公开日
    FI53661B|1978-03-31|
    IT1024886B|1978-07-20|
    NL7415207A|1975-05-26|
    DE2454947A1|1975-05-28|
    DD114799A5|1975-08-20|
    JPS5084495A|1975-07-08|
    AU7539874A|1976-05-20|
    ES432140A1|1976-11-16|
    SE7414715L|1975-05-23|
    FR2252291A1|1975-06-20|
    NO139118C|1981-10-01|
    ZA747456B|1976-01-28|
    FI53661C|1978-07-10|
    US3983222A|1976-09-28|
    JPS5343396B2|1978-11-18|
    NO744200L|1975-06-16|
    GB1461108A|1977-01-13|
    CA1052019A|1979-04-03|
    NO139118B|1978-10-02|
    FI360473A|1975-05-23|
    ATA927974A|1976-09-15|
    AT336646B|1977-05-10|
    SE391652B|1977-02-28|
    HU174935B|1980-04-28|
    FR2252291B1|1980-01-11|
    CS185663B2|1978-10-31|
    BE822458A|1975-03-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR2391953B1|1976-11-02|1979-08-17|Ugine Kuhlmann|
    CA1096151A|1976-11-12|1981-02-24|Grant Gellatly|Method for removal of potassium nitrate from tobacco extracts|
    US4131118A|1976-11-12|1978-12-26|Philip Morris Incorporated|Method for removal of potassium nitrate from tobacco extracts|
    US4131117A|1976-12-21|1978-12-26|Philip Morris Incorporated|Method for removal of potassium nitrate from tobacco extracts|
    JPS6034640B2|1980-03-19|1985-08-09|Sekisui Chemical Co Ltd|
    ES8505898A1|1984-07-30|1985-06-16|Union Explosivos Rio Tinto|Process for obtaining potassium nitrate from potassium chloride and nitric acid|
    GB8607034D0|1986-03-21|1986-04-30|Rohm & Haas|Removal of no3 from salt solutions|
    DE68904070T2|1989-05-09|1993-04-29|Bayer Antwerpen Nv|METHOD FOR REMOVING NITRATE AND ORGANIC IMPURITIES FROM SEWAGE.|
    US5110578A|1989-10-05|1992-05-05|Monomeros Colombo Venezolanos, S.A. |Continuous production of potassium nitrate via ion exchange|
    US6475457B2|1998-06-22|2002-11-05|William J. Rigby|Process for manufacturing potassium nitrate fertilizer and other metal nitrates|
    JP2014138914A|2013-01-21|2014-07-31|Kyoto Univ|Method for removing nitrogen compounds within treatment target water|
    US9902626B2|2013-07-26|2018-02-27|General Electric Company|Method and filter for removing nitrate ions|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI3604/73A|FI53661C|1973-11-22|1973-11-22|CONTAINER REFRIGERATOR FOR EXTRAHERING AV NITRATER FRAON NITRATHALTIGA LOESNINGAR|
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