Isolation and purification of 1,2-cyclohexanediol

1;  2-Cyclohexanediol;  rectification;  Purification

Batch vacuum rectification was used to separate and purify the heat-sensitive, high boiling point and high freezing point organic matter trans-1,2-cyclohexanediol, and the optimal operating process conditions were optimized by using the method of variable pressure strength and variable reflux ratio. The operating conditions are: hot water with a temperature of about 96 °C is used as the condensing medium at the top of the tower; Full reflux start time: 2 h; Control kettle temperature 180~185°C, segmented constant vacuum 0.086~0.092 MPa; The segmented constant reflux ratio is 5→8→12. The yield of the product obtained under this operating condition is more than 87%, the purity of the product can reach more than 98%, and the color is white.