• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    For the reduction of the ammonia content in the product gas of the hydrocyanic acid-methane-ammonia (BMA) process and accordingly to increase the yield the reaction gas mixture of this process is brought into contact with zeolite and the ammonia thereafter desorbed from the zeolite preferably again employed in the reaction step. If the desorption is carried out with a flushing gas such as the hydrocarbon used in the reaction then this mixture can be directly supplied again to the BMA reactor. Through this procedure the amount of ammonia previously lost to the process can again be made useful in the process itself.
    公开号:SU1055328A3
    申请号:SU802984493
    申请日:1980-09-23
    公开日:1983-11-15
    发明作者:Фойгт Карл；Штрак Ханс；Кляйншмит Петер
    申请人:Дегусса А.Г. (Фирма)；
    IPC主号:
    专利说明:

    1 The invention relates to methods for producing hydrogen cyanide. A known method for producing hydrogen cyanide by the interaction of C-Su-hydrocarbon and ammonia in the absence of oxygen, followed by removal of the gas mixture. containing hydrogen cyanide, cooling it to 300-00 C. in a water-cooled aluminum chamber located in the upper part of the reactor 1. The disadvantage of this method is that unreacted ammonia is removed with the exhaust gas ,. as a result, the initial reagents are not fully utilized. The aim of the invention is to more fully utilize ammonia by allowing the separation of ammonia and hydrogen cyanide. This goal is achieved by the fact that according to the method of producing hydrogen cyanide, which involves the interaction of Cs-C hydrocarbons and ammonia, followed by removal of the gas from the mixture containing hydrogen cyanide and unreacted ammonia, the resulting gas mixture makes contact with the zeolite selected from the group : zeolite A, zeolite X,; zeolite Y, zeolite P, mordenite, clinoptilolite or erionite, at 30-100 ° С with subsequent desorption of adsorbed ammonia. The desorption of adsorbed ammonia is carried out / at a pressure of 0.001-1 bar with air or nitrogen and hydrogen or hydrocarbon. The stripped ammonia is condensed and the gas mixture formed after desorption is directed back to the production of hydrogen cyanide. Despite the fact that ammonia and hydrogen cyanide have similar molecular sizes and dipole moments and concentration% in a mixture of hydrogen cyanide and much higher than ammonia, it is ammonia that is absorbed under 8 specified conditions, which provides the possibility of separating ammonia and hydrogen cyanide from ., mixtures thereof. At temperatures below 20 ° C, hydrogen cyanide condensates, and at temperatures above 100 ° C, the separation worsens, while at temperatures higher than that, ammonia is no longer sorbed. The method is carried out as follows. Ammonia and hydrocarbons, such as methane, are fed to the mixer, and then to the high-pressure washer. During combustion, additional heat is generated to synthesize hydrogen cyanide in the furnace, the reaction gas from the furnace is fed to the adsorber filled with zeolite, the gas mixture comes out of the adsorber. It contains almost no ammonia, which is fed to the C 5-95 NUZ washer. Hydrogen cyanide escapes and is sent from the top of the washer to a condenser. The uncondensed gas consists mainly of hydrogen. Desorption can be carried out in various ways, it is preferable to desorb with air or nitrogen and hydrogen or a hydrocarbon at O-fOO C and a pressure of 0.001-1 bar. The desorbed ammonia, together with the desorption gas, is removed from the adsorber and fed to the mixer where it is mixed again with primary ammonia and hydrocarbon. Example. In the BMA laboratory apparatus, including a tube furnace, there is an OMA contact tube adjacent the upper part to the water-cooled element. Here, a gas stream of composition, I: HCN 22-25, MNE 2-5, H 70-75, is obtained, which is fed to the adsorption columns with zeolites. The results of experiments on various zeolites are given in the table.
    710553288
    The technical advantage of the proposal is to separate the ammonia from the gas containing
    method consists in the fact that the cyanide hydrogen, there is the possibility of re-use. The proposed method is harmless to
    changes initially introduced as ambient, since ammonia is not
    Miak, occurs almost completely predsudal to the atmosphere and does not transform ..
    rotation of ammonia in cyanic hydrogen in such undesirable compounds without the use of other adsorbents, such as, for example, ammonium sulfate, such as activated carbon or in addition, it is possible
    silica gel, without polymerization cyanis embedding the purification stage in
    hydrogen, with the result that
    perhaps technically simple methodic hydrogen cyanide.
    权利要求:
    Claims (3)
    [1]
    1. METHOD FOR PRODUCING CYANIDE HYDROGEN, including the interaction of C <-C 7 - hydrocarbon and ammonia, followed by removal of the resulting gas mixture containing hydrogen cyanide and unreacted ammonia, distinguishing with the fact that, in order to more fully use ammonia due to the possibility of using ammonia separation of ammonia and hydrogen cyanide, the resulting gas mixture is brought into contact with a zeolite selected from the group: zeolite A, zeolite X, zeolite U, zeolite P, mordenite, clinoptilolite or erionite ^ at 30-100 ° C followed by desorption of adso doped ammonia.
    [2]
    2. The method of pop. 1, characterized in that the desorption of adsorbed ammonia is carried out at a temperature of 40-400 ° C and a pressure of 0.001-1 bar with air or nitrogen and hydrogen or a hydrocarbon. §
    [3]
    3. The method of ps square 1 and 2, characterized in that the desorbed ammonia is condensed and the gas mixture formed after desorption is sent again to produce hydrogen cyanide.
    SU <, "1055328>
    1 1055328
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    同族专利:
    公开号 | 公开日
    IL61547A|1984-05-31|
    CA1143133A|1983-03-22|
    IT1129890B|1986-06-11|
    DE2947498C2|1982-01-21|
    DD154602A5|1982-04-07|
    ATA569780A|1981-11-15|
    GB2063234A|1981-06-03|
    CH644825A5|1984-08-31|
    PL228013A1|1981-07-10|
    RO81071A|1983-08-03|
    PL129255B1|1984-04-30|
    JPS5688823A|1981-07-18|
    BR8007618A|1981-06-02|
    NL8005157A|1981-06-16|
    SE8008186L|1981-05-25|
    IL61547D0|1980-12-31|
    SE432415B|1984-04-02|
    ES495603A0|1981-07-16|
    RO81071B|1983-07-30|
    AT367374B|1982-06-25|
    FR2470092A1|1981-05-29|
    FR2470092B1|1985-04-19|
    GB2063234B|1983-10-12|
    ES8106466A1|1981-07-16|
    ZA807174B|1981-11-25|
    YU41449B|1987-06-30|
    US4317808A|1982-03-02|
    YU238280A|1983-02-28|
    BE886307A|1981-05-21|
    CS227317B2|1984-04-16|
    DE2947498A1|1981-05-27|
    IT8068787D0|1980-11-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR1134298A|1953-01-13|1957-04-09|Otto & Co Gmbh Dr C|Process and installation for the separation of gases obtained by the synthesis of hydrocyanic acid|
    US2995423A|1957-09-20|1961-08-08|Union Carbide Corp|Crystalline zeolite m|
    US3112177A|1959-11-11|1963-11-26|Toyo Koatsu Ind Inc|Method of separating ammonia from hydrogen cyanide|
    US3184518A|1960-08-22|1965-05-18|Standard Oil Co|Increased efficiency in molecular sieve adsorption system|
    BE617822A|1961-05-19|
    US3517484A|1968-03-13|1970-06-30|Union Carbide Corp|Selective adsorption process|
    US3508382A|1968-03-13|1970-04-28|Union Carbide Corp|Adsorption process for acidic gases|
    US3732326A|1970-05-19|1973-05-08|Mobil Oil Corp|Selective sorption of less polar molecules with crystalline zeolites of high silica/alumina ratio|
    US3719026A|1971-06-01|1973-03-06|Zeochem Corp|Selective sorption of non-polar molecules|
    JPS548196B2|1972-08-12|1979-04-13|
    US4056370A|1973-06-07|1977-11-01|Bayer Aktiengesellschaft|Zeolite A with improved properties|
    DE2902503A1|1979-01-23|1980-07-24|Alkem Gmbh|METHOD FOR REMOVING AMMONIA FROM PROCESS EXHAUST GAS|
    DE2913925C2|1979-04-06|1982-06-03|Degussa Ag, 6000 Frankfurt|Process for the production of hydrogen cyanide|US4831208A|1987-03-05|1989-05-16|Uop|Chemical processing with an operational step sensitive to a feedstream component|
    DE69719979T2|1996-06-06|2003-12-04|Du Pont|METHOD FOR SEPARATING AND SELECTIVELY REMOVING HYDROGEN IMPURITY FROM PROCESS FLOWS|
    US5817286A|1997-07-25|1998-10-06|Thermatrix Inc.|Processes for the synthesis of hydrogen cyanide|
    SG76635A1|1999-03-10|2000-11-21|Japan Pionics|Process and apparatus for recovering ammonia|
    US6664740B2|2001-02-01|2003-12-16|The Regents Of The University Of California|Formation of a field reversed configuration for magnetic and electrostatic confinement of plasma|
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    EP3301075A1|2016-09-28|2018-04-04|Evonik Degussa GmbH|Method for producing hydrogen cyanide|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE2947498A|DE2947498C2|1979-11-24|1979-11-24|Process for the production of hydrogen cyanide|
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