The invention provides a method for effectively improving the purity of a
linalool product, which comprises the following steps of: adding a catalyst into a reaction solution for preparing
linalool through selective hydrogenation of
dehydrolinalool, catalyzing an incompletely converted
dehydrolinalool raw material to carry out
isomerization reaction, generating 3, 7-dimethyl-3, 6-octadiene-2-
ketone and
citral of which the
boiling point is greatly different from that of
linalool, and separating the 3, 7-dimethyl-3, 6-octadiene-2-
ketone and
citral. The linalool is produced through selective hydrogenation of the
dehydrolinalool, a small amount of dehydrolinalool raw materials are left in the obtained
hydrogenation reaction liquid, the boiling points of the dehydrolinalool and the linalool are very close, a self-cyclization reaction is easily generated, and cyclization impurities with the
boiling point close to that of the linalool are generated; therefore, rectification and purification of linalool have the defects of high number of
tower plates, large
reflux ratio, high product loss and the like. According to the method, a small amount of catalyst is added into the reaction liquid to catalyze
isomerization conversion of residual dehydrolinalool into
citral and other high-boiling-point impurities, and compared with a rectification scheme adopted by a traditional process, the method has the advantages that rectification
energy consumption and product loss are effectively reduced, and a linalool product with higher purity is obtained at lower separation cost.