PROCESS FOR THE CHLORINATION OF TRANS-1,4-DICHLORO-2-BUTENE TO MESO-1,2,3,4-TETRA-CHLOROBUTANE

摘要

1433628 Meso-1,2,3,4-tetrachlorobutane production E I DU PONT DE NEMOURS & CO 3 Oct 1973 [4 Oct 1972] 46221/73 Heading C2C Meso-1,2,3,4-tetrachlorobutane is prepared in the liquid phase by contacting trans-1,4- dichloro-2-butane with Cl 2 at 0-120‹ C. with efficient agitation and in the presence of a freeradical inhibitor and a source providing at least 1 x 10-3 gm.-ions of chloride ion dissolved per kgm. of reactor solution. Preferably 101-105% of the stoichiometric amount of Cl 2 in gaseous form is contacted with the 1,4- dichloro-2-butane at 70-100‹ C. with oxygen as the free-radical inhibitor. The preferred chloride ion sources are quaternary ammonium chlorides, quaternary phosphonium chlorides and tert-sulphonium chlorides in which the organic group has 8-20 C atoms. A chlorination-resistant solvent such as CCl 4 may constitute up to 80 wt. per cent of the reaction mass, exclusive of Cl 2 .