摘要
针对雷珀法生产1,4-丁二醇废液特点,加入Na2CO3等碱性添加剂以抑制精馏后期1,4-丁二醇环化脱水生成四氢呋喃,采用减压间歇切割精馏回收1,4-丁二醇.结果表明,加入碱性添加剂和增大真空度对提高1,4-丁二醇产品浓度及回收率效果明显.最佳工艺条件为:添加剂为Na2CO3,Na2CO3用量为0.5%,真空度81.33kPa,这时精馏釜温为220℃,1,4-丁二醇产品浓度与回收率分别可达95.68%和79.73%.此分离回收工艺操作灵活简便,添加剂便宜易得,便于推广应用.
Based on the properties of waste liquid from Reppe-teehnology producing 1,4-butanediol , the alkaline additive as Na2 CO3 was added into waste liquid to restrain dehydration of 1,4-butanediol into tetra- hydrofuran during the later period of distillation , and the vacuum batch cutting distillation technology was used for the recovery of 1,4-butanediol . The result showed that adding alkaline additive into waste liquid and increasing vacuum degree could achieve obvious effect on improving the concentration and the recovery rate of 1,4-butanediol . The optimum vacuum batch cutting distillation operating conditions was when the additive was NazCO3 , the added dosage of Na2CO3 was 0.5% and the vacuum degree was 81.33 kPa, and then the distillation bottom temperature was 220℃ , the concentration and the recovery rate of 1,4-butane- diol could reach 95.68% and 79.73% respectively. The separation and recovery process is simple and flexi- ble, additives are cheap and easy to obtain , it is beneficial to be applied extendedly.
出处
《湘潭大学自然科学学报》
CAS
北大核心
2013年第2期58-63,共6页
Natural Science Journal of Xiangtan University
关键词
减压间歇切割精馏
1
4-丁二醇
回收
添加剂
多组分
the vacuum batch cutting distillation
1,4-Butanediol
recovery
additive
multi-components
