Liang Shisheng, Bu Guangle
Department of Chemical and Pharmaceutical Engineering, Huanghuai University, Zhumadian, 463000, China.
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
Sci Rep. 2024 Nov 18;14(1):28472. doi: 10.1038/s41598-024-79870-6.
Chemical process intensification has attracted extensive interest of scholars. Distillation, as a high energy consumption industry, is in urgent need of energy saving and CO emissions reduction by means of process intensification. In this paper, isobutanol and p-xylene azeotrope was separated by pressure swing distillation (PSD). Combined with process integration method, four heat integration PSD processes including partial heat integration PSD (PHI-PSD), enhanced partial heat integration PSD (EPHI-PSD), full heat integration PSD (FHI-PSD), and enhanced full heat integration PSD (EFHI-PSD) were designed and optimized through sequential iterative procedure. The total annual cost (TAC), CO emissions, and thermodynamic efficiency were calculated and compared. By comparing relevant data, it is found that EPHI-PSD process has obvious advantages in terms of economic, thermodynamic efficiency, and environmental benefits. Specifically, comparing with the basic PSD process, thermodynamic efficiency of EPHI-PSD process is improved by 97.8% while TAC and CO emissions are decreased by 37.0% and 50.1%, respectively.
化学过程强化已引起学者们的广泛关注。蒸馏作为一个高能耗行业，迫切需要通过过程强化来实现节能和减少碳排放。本文采用变压精馏（PSD）分离异丁醇和对二甲苯共沸物。结合过程集成方法，通过顺序迭代程序设计并优化了四种热集成变压精馏过程，包括部分热集成变压精馏（PHI-PSD）、强化部分热集成变压精馏（EPHI-PSD）、全热集成变压精馏（FHI-PSD）和强化全热集成变压精馏（EFHI-PSD）。计算并比较了年总成本（TAC）、碳排放和热力学效率。通过比较相关数据发现，EPHI-PSD过程在经济、热力学效率和环境效益方面具有明显优势。具体而言，与基本变压精馏过程相比，EPHI-PSD过程的热力学效率提高了97.8%，而年总成本和碳排放分别降低了37.0%和50.1%。
