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    1.
    发明专利
    未知

    公开(公告)号：DE1594627A1

    公开(公告)日：1971-01-07

    申请号：DE1594627

    申请日：1966-06-01

    Applicant: STANDARD OIL CO

    Inventor： STANLEY DELUGA SIGMUND ,  WATSON HARNACH JAMES ,  QUINCY LITTLE JUN RANDEL

    IPC: C10M133/02 ,  C25B3/29 ,  C25B15/08

    Abstract: 1,152,699. Purification of electrolyte employed in electrohydrodimerizing acrylonitrile to adiponitrile. MONSANTO CO. 31 May, 1966 [2 June, 1965], No. 24241/66. Heading C2C. Impurities (e.g. Cu, Ni, Ag, Pb, Cr) are removed from a catholyte employed in electrohydrodimerizing acrylonitrile to adiponitrile, said catholyte having a pH from 6À5 to 12 and including an aqueous solution of a hydrotropic quaternary salt, by (a) separating said aqueous solution from said catholyte, (b) increasing the pH of said aqueous solution to a value at least greater than 7 and substantially greater than the pH of said catholyte, (c) adjusting the salt concentration of said aqueous solution to between 25 and 85 wt. per cent, (d) heating said aqueous solution at a temperature not greater than 115‹ C. for a period of time sufficient to precipitate said impurities, and (e) separating said impurities from said aqueous solution. The catholyte solution preferably has a pH of 7À5-10 which is preferably increased by at least 2 in the process, after which the said salt concentration is preferably adjusted to 45-85 wt. per cent and said aqueous solution is heated at 80-115‹ C. for 1 to 4 hours. Suitable quaternary ammonium salts are tetraalkylammonium aryl sulphonates and tetraalkylammonium alkyl sulphates. The quaternary salt solution may be obtained by extraction with acrylonitrile and after the above purification may be recycled.

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