Double bond isomerization method for n-butene

The invention relates to a method for isomerizing double bonds of n-butylene. The invention mainly solves the problems that the prior art has poor reaction selectivity and short catalyst regeneration period. Through a technical proposal that a raw material containing butylenes and silicon dioxide as a catalyst contact and react to generate an effluent substance with molar ratio of butylenes-1 to butylenes-2 close to a thermodynamic equilibrium value under the conditions of reaction temperature of between 100 and 480 DEG C, reaction pressure of between -0.08 and 10MPa and weight space velocity of between 0.1 and 100 hours, wherein the purity of the silicon dioxide is more than 98 percent; the specific surface of the silicon dioxide as the catalyst is between 50 and 600 centiare/gram; and the method solves the problem and can be applied to industrial production of isomerization of double bonds of n-butylene.