| 摘要 |
1,219,995. Adiponitrile. E. I. DU PONT DE NEMOURS & CO. 13 June, 1969 [14 June, 1968], No. 30229/69. Headings C2C. Adiponitrile is produced by (a) reacting HCN with a mixture of 3- and 4-pentenenitriles, in the presence of a catalyst and under conditions such that trans-2-pentenenitrile is isomerized to the cis form to produce a mixture containing adiponitrile and 2-, 3- and 4-pentenenitriles; (b) fractionally distilling this mixture to separate adiponitrile therefrom; (c) fractionally distilling the mixture of pentenenitriles so obtained to separate cis-2-pentenenitrile; and (d) recycling the remaining pentenenitriles to the hydrocyanation reactor. Specified catalysts are nickel, palladium or cobalt complexes, which may be preformed or prepared in situ and which may be used in conjunction with promotors. The pentenenitrile starting material may be obtained by the hydrocyanation of butadiene. |
