Patent ID: 6608226
Filing Date: 2003-08-19
Classification: C07C

Abstract:
A method for inhibiting the polymerization of acrylonitrile during the manufacture of acrylonitrile comprisingproviding a reaction mixture for the manufacture of acrylonitrile in the absence of a material selected from the group consisting of an initiator and a catalyst which are not natural byproducts of the reaction to manufacture acrylonitrile; and adding to said reaction mixture a mixture of a hindered phenol and a phenylenediamine at a molar ratio and in an amount that is sufficient to inhibit polymerization of said acrylonitrile but insufficient to initiate polymerization, wherein said hindered phenol is selected from the group consisting of 2,6-di-tert-butyl phenol; 2,6-di-tert-butyl-4-methyl phenol; 2,6-di-methyl phenol; 2,4,6-tri-tert-butyl phenol; 2,6-di-tert-butyl-4-amine phenol; and 2,4-di-tert-butyl phenol.