Patent ID: 8513479
Filing Date: 2013-08-20
Classification: B01J,C07C

Abstract:
1. A method of preparing 1,3-butadiene, comprising: (i) producing a zinc ferrite catalyst consisting of: (A) dissolving a zinc precursor and an iron precursor in distilled water to form an aqueous precursor solution; (B) adding the aqueous precursor solution and simultaneously an alkaline solution having a molar concentration of 1.5-4.0 M to distilled water to form a mixed solution and simultaneously adjusting a pH of the mixed solution within a range of 6-10; (C) filtering the pH-adjusted mixed solution to obtain a solid catalyst; (D) drying the solid catalyst at 70-200° C.; and (E) heat-treating the dried solid catalyst at 350-800° C. (ii) continuously passing a reactant consisting of a mixed gas of a C4 mixture, air and steam through a catalyst layer supported with the zinc ferrite catalyst to conduct an oxidative dehydrogenation reaction, the C4 mixture comprises 0.5˜50 wt % of n-butane, 40˜99 wt % of n-butene, and 0.5˜10 wt % other than n-butane and n-butene, (iii) obtaining 1,3-butadiene from the catalyst layer.