正丁醇-甲苯共沸体系精馏分离研究

Study on the Distillation Separation of n-Butanol and Toluene Azeotropic Mixture

新型高性能特种环氧树脂合成中需要使用有机溶剂甲苯和正丁醇,它们的绿色、高效回收利用是生产过程中的迫切需要。针对甲苯和正丁醇的分离回收,采用模拟计算的方法设计分离流程,并研究了分离操作的工艺条件和流程的操作稳定性。研究结果表明,使用反应中产生的水作为挟带剂,通过共沸精馏可以在第一个塔的塔釜得到符合回用要求的正丁醇;在塔顶得到水和甲苯的共沸物,将其引入后续的油水分相塔,在分相塔塔顶得到符合回用要求的甲苯,塔釜得到含有微量有机物的水,大部分水直接回到第一个精馏塔被用作挟带剂,少部分水被引入废水处理系统。稳定性分析表明,该流程对工况的波动具有很好的抗扰动能力。

The synthesis of novel high performance special epoxy resin requires organic solvents such as toluene and n-butanol, and their green and efficient recycling in the production process is essential. Aiming at the separation and recycling of toluene and n-butanol, the separation process was designed by simulated calculation method, and the operation conditions and stability of the separation process were studied. The results showed that the water produced in the reaction could be used as an entrainer, and the n-butanol which met the recycling requirements could he obtained in the bottom of the first column by azeotropic distillation; the watertoluene azeotrope was obtained in the top of the column, which went to the subsequent water-oil separation column. The toluene met the recycling requirement was obtained in the top of the separation column, and the water containing trace organics was obtained in the bottom of the column. Most of the water directly went back to the first distillation column to act as entrainer, and a small part of the water went to the wastewater treatment system. Stability analysis showed that this process had good disturbance resistance capability to fluctuations.