【摘要】 甲氧苄氨嘧啶合成过程产生大量含甲醇和乙醇的废液 ,实验研究了新的回收工艺。缩合及环合废液经预蒸馏并以 H2 SO4中和去除大量胺类杂质后再经精馏分离。结果表明 ,缩合废液甲醇塔回流比为 3,理论板为 40时 ,回收甲醇中水的质量分数可降至 0 .0 2 % ,可复用于生产甲醇钠。环合废液脱水后 ,分离塔回流比为 15 ,理论板为 40时 ,回收乙醇中甲醇的质量分数小于 10 %。已建成处理 12 t/ d废液的工业装置 ,有效地利用了废弃物中的资源更多还原

【Abstract】 Large amounts of methanol and ethanol exist in the effluent of the condensation and cyclization reaction during the trimethoprim synthesis process. A new recovery process was evaluated experimentally. After pre distillation and neutralization with sulfuric acid to remove the amine impurities, the methanol and the ethanol were separated and dehydrated by distillation. The recovered methanol, with water content less than 0.02%, from the condensation effluent in a methanol tower with 40 theoretical plates and a reflux ratio of 3 can be reused to prepare sodium methoxide. The recovered ethanol with less than 10% methanol can be purified in a dehydration tower and a separation tower with 40 theoretical plates and a reflux ratio of 15. A commercial system was developed to process 12 t/d effluent. The operation shows that the process effectivly can recover the resources of the waste water.更多还原