Method for preparing high-purity cyclopentadiene

The invention discloses a method for preparing high-purity cyclopentadiene (CPD) from crude dicyclopentadiene (DCPD). According to the method, crude dicyclopentadiene is taken as a raw material, a diluent is added in depolymerization, dicyclopentadiene and the diluent are mixed by a mass ratio of (1-4):1 and then put into a depolymerization kettle, under the conditions of normal pressure, depolymerization temperature of 160 DEG C-200 DEG C and reflux ratio of 0.5-5, the yield of cyclopentadiene is 90%, and finally, cyclopentadiene with purity more than 99% can be obtained. The method has obvious positive effects that polymerization of crude dicyclopentadiene can be effectively reduced, and the yield of dicyclopentadiene is improved; furthermore, the diluent can guarantee impurities such as isopropenyl norbornene not to be depolymerized so as to guarantee the purity of cyclopentadiene; the method is particularly suitable for preparing high-purity cyclopentadiene from raw material crude dicyclopentadiene obtain