Preparation method of 1, 4-cyclohexanedimethanol

The invention provides a preparation method of 1, 4-cyclohexanedimethanol, which comprises the following steps: 1, 4-cyclohexanedicarboxylic acid is subjected to hydrogenation reaction to prepare 1, 4-cyclohexanedimethanol, the reaction is carried out on a fixed bed reactor, 1, 4-cyclohexanedicarboxylic acid and water are heated and dissolved in a high-pressure reaction kettle, the solution is conveyed into the fixed bed reactor through a high-temperature pump, and the 1, 4-cyclohexanedimethanol is prepared through the high-temperature pump. Hydrogenation is performed under the action of a catalyst to obtain a product 1, 4-cyclohexanedimethanol; the active component of the catalyst is Ru, the auxiliaries are Pd and Sn, and the carrier is one of carbon nanotubes and carbon nanofibers. The conversion rate of the raw material 1, 4-cyclohexanedicarboxylic acid reaches 99.5% or above, and the yield of the product 1, 4-cyclohexanedimethanol can stably reach 98.5% or above. In addition, the service life of the catal