减压间歇精馏制备δ-戊内酯新工艺的研究

Study on new intermittent vacuum distillation process for preparation ofδ-valerolactone

以1,5-戊二醇为原料催化脱氢得到δ-戊内酯粗品,再采用减压间歇精馏工艺进行提纯,得到δ-戊内酯纯度为99.8%、收率为95.0%,产品质量达到了聚合级技术指标。减压间歇精馏工艺的操作条件为:压力5.0 k Pa、塔顶温度140℃、回流比2.5~3.0。该新工艺能耗低、操作简便,工业化推广意义较大。

Crudeδ-valerolactone solution is obtained from catalytic dehydrogenation of 1,5-pentanediol,and purified by an intermittent vacuum distillation process to produce pureδ-valerolactone with a purity of 99.8%at a yield of95.0%.The quality of pureδ-valerolactone reaches the technical index of polymerization grade product.The operating conditions for intermittent vacuum distillation process are as follows:system pressure is 5.0 k Pa,tower top temperature is at 140℃,and the reflux ratio is in the range of 2.5-3.0.This process has the advantages of low energy consumption and simple operation,and is of great significance for industrialization.