采用二次内酯化方法从葡醛内酯生产废液中回收产品

Retrieving Glucurolactone from the Waste Liquid by the Second Lactonization

分析了葡醛内酯传统工艺中淀粉原料、中间产物及产品流失的主要原因,提出了从葡醛内酯生产废液中通过二次内酯化进一步回收产品的可行性方案.结果表明,在V(硝酸)∶V(冰醋酸)∶V(废液)=0.6∶1.0∶10,反应温度为60℃,反应时间为60min的条件下,葡醛内酯提取物每100mL废液可达6g,纯度为82%.

The main reasons why the starch,the middle and final products run off from the waste liquid by the classical technology were studied. In this article, first of all, the feasibility of retrieving glucurolactone from the waste liquid by the second lactonization was studied.When the temperature was 60 ℃, and volume ratios of nitric acid to acetic acid and to waste liquid were (0.6∶1.0∶10), about eight grams of distilling materials were obtained from 100 mL of the waste liquid,with the purity of 82%.