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  • 优先权
    • 专利摘要:
    <P> Process for the manufacture of benzoyl cyanide from benzoic acid anhydride and alkali metal cyanide. Characterized in that the reaction is carried out in an inert organic solvent. </ P> <P> Applicable procedure for high efficiency. </ P>
    公开号:SU719494A3
    申请号:SU772489906
    申请日:1977-06-02
    公开日:1980-02-29
    发明作者:Кленк Херберт；Офферманнс Хериберт
    申请人:Дегусса (Фирма)；
    IPC主号:
    专利说明:

    (54) METHOD FOR OBTAINING BENZOYL CYANIDE
    The solvent content depends on its tiaa. It is advisable to use for each mole of benzoic acid anhydride at least 100 ml of solvent, preferably 200-5000 ml, in particular 300-1000 ml of solvent for each mole of benzoic acid anhydride.
    The process temperature depends on the type of solvent, preferably a temperature of 80-140 ° C. The pressure can be chosen arbitrarily, but in some cases, due to the presence of volatile substances, it is advisable to operate at elevated pressure corresponding to the temperature.
    Example 1. A mixture of 45.2 g (0.2 mol) of benzoic acid anhydride, 12.3 g (0.25 mol) of sodium cyanide and 150 ml of chlorobenzene is kept in a refluxed vessel for 4 hours at 135 ° C. The mixture is then cooled and filtered with suction. The precipitate, consisting mainly of sodium benzoate, is washed with chlorobenzene. The filtrate is dried at 16-10 at and temperature up to 90 ° C. In the residue, a yellow product is obtained in an amount of 25 g (96% relative to the starting benzoic anhydride) benzoyl cyanide.
    Example 2. Analogously to example 1 in 200 ml of xylene at 125 ° C. 25 g (96% relative to the starting benzoic anhydride) benzoyl cyanide are obtained.
    Example 3. Analogously to Example 1, but instead of 150 ml of chlorobenzene, the following solvents are used:
    Benzoyl cyanide yield, calculated on taken anhydrous solvent, ml of benzoic acid.
    94 96 93 89 87
    150 tetrachloroethane 150 petroleum ether 150 ethyl benzene 180 butyl acetate
    180 ethylene glycol diethyl ether
    - Example 4. Analogously to example 1 in 200 ml of xylene for 8 hours at 90 and 95 ° C. The yield of benzoyl cyanide 24 g (92%).
    Example 5. Analogously to example 1 in 150 ml of 1,4-dichlorobenzene. The original mixture was incubated for 4 hours at 175 ° C. The yield is 23.5 g (91%).
    As in the case of the initial examples 1 and 2, and in the case of the examples 3, 4 and 5, the product is analyzed by infrared spectral analysis. In all cases, the analysis showed that the purity of the benzoyl cyanide obtained was above 99.9%.
    权利要求:
    Claims (3)
    [1]
    1. A method for producing benzoyl cyanide by reacting benzoic acid anhydride with an alkali metal cyanide at an elevated temperature, followed by separation of the product, characterized in that, in order to increase the yield of the target product, the process is carried out in an inert organic solvent at 80-200 ° C.
    [2]
    2. A method according to claim 1, characterized in that the reaction is carried out at 80-140 ° C.
    [3]
    3. Method according to paragraphs. 1 and 2, characterized in that either chlorobenzene, or xylene, tetrachloroethane, or petroleum ether, or ethylbenzene, or butyl acetate, or ethylene glycol diethyl ether, or 1,4-dichlorobenzene is used as an inert organic solvent.
    Sources of information taken into account in the examination
    1.Bull. Soe. Chem. France, 1972, c. 2402,
    2.Lebigs Ann. Chem. 1895, 287, p. 305 (prototype).
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    同族专利:
    公开号 | 公开日
    FR2364893A1|1978-04-14|
    IL52233D0|1977-08-31|
    JPS5337638A|1978-04-06|
    NL7706157A|1978-03-22|
    AT347438B|1978-12-27|
    US4117008A|1978-09-26|
    DE2642199A1|1978-03-23|
    BE855252A|1977-11-30|
    IT1143601B|1986-10-22|
    ATA392177A|1978-05-15|
    GB1520727A|1978-08-09|
    CH626332A5|1981-11-13|
    DD130241A5|1978-03-15|
    IL52233A|1980-11-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2528211C3|1975-06-25|1980-03-06|Bayer Ag, 5090 Leverkusen|Process for the production of acyl cyanides|DE2614241C3|1976-04-02|1980-03-20|Bayer Ag, 5090 Leverkusen|Process for the production of acyl cyanides|
    JPS5671646U|1979-11-02|1981-06-12|
    DE3015587A1|1980-04-23|1981-10-29|Bayer Ag, 5090 Leverkusen|METHOD FOR PRODUCING ACYLCYANIDES|
    DE3025304A1|1980-07-04|1982-02-04|Bayer Ag, 5090 Leverkusen|METHOD FOR PRODUCING ACYLCYANIDES|
    GB2123852B|1982-07-19|1986-06-11|Gen Electric|Electrode contacts for high currant circuit interruption|
    EP0549531A1|1991-12-20|1993-06-30|Säurefabrik Schweizerhall|Process for preparing acid anhydrides|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19762642199|DE2642199A1|1976-09-20|1976-09-20|METHOD FOR PRODUCING BENZOYLCYANIDE|
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