从工业废液中回收四氢呋喃及正丁醇的工艺研究

Process of recovering tetrahydrofuran and n-butanol from industrial wastewater

利用Aspen Plus软件对含有四氢呋喃、正丁醇、γ-丁内酯和水的工业废液的分离提纯工艺进行了确定和模拟。确定使用1,4-丁二醇作为萃取剂,采用四塔流程分离该工业废液,回收四氢呋喃和正丁醇。四氢呋喃的回收使用萃取精馏,溶剂比为0.9,回流比为5,所需塔板数为28块,废液和萃取剂分别从第16块板和第5块板以泡点进料;正丁醇的回收使用两塔共沸精馏,所需脱水塔塔板数为7块,回收塔塔板数为5块。在此操作参数下,模拟所得四氢呋喃回收率可达99.9%,质量分数为99.99%,正丁醇回收质量分数达到99.99%。通过实验结果与模拟结果的比较,验证了本工艺的可行性和模拟结果的可靠性。

The purification process for separation of industrial wastewater containing tetrahydrofuran, n-butanol, 1,4- butyrolactone and water have been determined and simulated by Aspen Plus. 1,4-Butanediol is chosen as extractant. The separation process with four towers is designed for the mixture. Tetrahydrofuran is separated from the mixture by method of extractive distillation under the following conditions ：feeding waste water and extractant at the 16th plate and 5th plate, respectively, at their boiling point,0. 9 of solvent ratio and 4 of reflux ratio, n-Butanol is recovered from the mixture by method of azeotropic distillation ：7 of dehydration column plate number and 5 of recovery column plate number. Under the conditions mentioned above, the recovery rate and purity of tetrahydrofuran can reach 99. 9% and 99. 99%, respectively. The purity of butanol is 99. 99% as well. Finally, the reliability of extractive distillation and azeotropic distillation simulation is verified through the results of experiment and simulation.