1,2-环己二醇的分离与提纯

Study on Separation and Purification of Trans-1,2-cyclohexanediol

应用间歇减压精馏对热敏性、高沸点、高凝固点的有机物———反式-1,2-环己二醇进行分离、提纯,通过采用变压强、变回流比的方法,优化出了最佳的操作工艺条件.操作条件是:塔顶用温度为96℃左右的热水作冷凝介质;全回流开工时间2h;控制釜温180～185℃,分段恒真空度0 086～0 092MPa;分段恒回流比5→8→12.在此操作条件下所得产品的收率在87%以上,产品纯度可达98%以上,色泽较白.

Trans-1,2-cyclohexanediol which has heat sensitivity, high boiling point and high coagulating point is separated and purified with batch distillation under vacuum. The distillation is made by changing pressure and reflux ratio strategy. The optimal operating condition is acquired. The operating condition with changing pressure and changing reflux ratio of batch distillation under vacuum which purifies raw trans-1,2-cyclohexanediol is that the beginning time of overall reflux is 2h and the bottom temperature 180～185℃, the changing vacuum 0.086～(0.092 MPa), the changing reflux ratio 5→8→12. The production ratio of trans-1,2-cyclohexanediol is over 87% and the product purity is beyond 98% under the above operation condition. The product's color gets much whiter.