摘要
研究了萃取精馏工艺对乙二胺和水共沸物的分离。通过Aspen Plus模拟计算了水对乙二胺(EDA)的相对挥发度,以此建立了一种快速筛选萃取剂的方法,确定最佳萃取剂为1,4-丁二醇。以1,4-丁二醇为萃取剂,选用Aspen Plus中的RadFrac严格精馏模型,进一步对萃取工艺操作参数进行了模拟优化,确定了脱水塔及EDA精制塔的最佳操作条件,即脱水塔理论塔板数为27,原料进料位置为第7块理论板,萃取剂进料位置为第3块理论板,萃取剂用量为300 kg/h,回流比为0.5;EDA精制塔理论板数为29,回流比1.5,进料位置在第5块理论板。在最优工艺条件下,水的理论纯度(质量分数)可达99.90%,EDA纯度大于99.90%,回收1,4-丁二醇纯度大于99.90%;对1,4-丁二醇的萃取效果进行了实验验证,水纯度达到99.99%,EDA纯度达到99.92%,实际萃取结果与模拟结果相当。
Extractive distillation was investigated to achieve the separation of azeotropic the theoretical simulation with Aspen Plus, the relative volatility of EDA ＋ H20 mixture extractants, and the results indicate that 1,4-butanediol is the best extractant. EDA ＋ H20 mixture. Using was estimated under various Furthermore, the operation parameters of extractive distillation were also simulated and optimized with the RadFrac model of Aspen Plus. The optimal theoretical plates were 27 and 29 for dehydration and EDA column, respectively. The locations of extractant and feed were the third and fifth plate, respectively. The dosage of extractant was 300 kg/h and the reflux ratios were 0.5 and 1.5 for dehydration and EDA column, respectively. Under the theoretically optimal conditions, the purities of water and EDA were above 99.90%, and the purity of 1,4-butanediol recovered was above 99.90%. With 1,4-butanediol as extractant, the actual experimental results were consistent with the simulated results.
出处
《化学工程》
CAS
CSCD
北大核心
2014年第10期25-28,共4页
Chemical Engineering(China)
关键词
乙二胺
共沸
萃取精馏
1, 2-ethanediamine
azeotropic
extractive distillation
