System and method for rectifying and purifying cyclohexane

The invention relates to the field of production of caprolactam by-product cyclohexane, in particular to a cyclohexane rectification and purification system, which comprises a water washing tower, a reactor, a refining tower I, a reflux tank I, a refining tower II and a reflux tank II which are communicated in sequence, a hydrogen heater is connected in series between the water washing tower and the reactor; the top of the first refining tower is communicated to a first reflux tank through two groups of parallel condensers, and a tower kettle of the first refining tower is connected with a finished product cyclohexane storage tank; the top of the second refining tower is communicated to a second reflux tank through a cooler, and methylcyclopentane is output from the bottom of the second reflux tank. By utilizing the system, the purity of cyclohexane can be improved, and the output of waste oil can be reduced. 本发明是己内酰胺的副产品环己烷生产领域，具体是一种环己烷精馏提纯的系统，包括依次连通的水洗塔、反应器、精制一塔、回流一罐、精制二塔和回流二罐；所述水洗塔和反应器之间串联有氢气加热器；所述精制一塔塔顶经两