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ABSTRACT
An energy-saving complex distillation column, can separate ethyl acetate and isopropanol from pharmaceutical waste water. This allows reducing energy consumption and improve economically efficiency, was proposed by this article. According to the requirements of industrial carbon emission reduction, carbon tax and carbon emission rate, were added to the calculation of total annual cost (TAC). Based on Aspen Plus simulation, carbon emission reduction as a comprehensive optimization objective to optimize the process. The optimization results show that process is more energy-saving than traditional processes, the reboiler duty and TAC are respective reduced by 44.96% and 52.93%, and the carbon emission reduction is calculated accurately. This study provides the design and theoretical basis for the industrialization of similar organic matter separation process.
Nomenclature
| = | carbon emission amount | |
| = | operating cost | |
| CEDC = | = | conventional extractive distillation arrangement/column |
| DMSO = | = | dimethyl sulfoxide |
| EA = | = | ethyl acetate |
| EDWC = | = | extractive dividing-wall column |
| EG = | = | ethylene glycol |
| = | fuel cost | |
| FCI = | = | fixed investment cost and equipment cost |
| = | emission factor | |
| = | fuel consumption | |
| IPA = | = | isopropanol |
| = | the cost coefficient of different fuels | |
| = | the cost factor per ton of fuel | |
| Mass D&B = | = | the Mass flow rate of the liquid at the top of the column and the bottom of the rectifying column |
| P = | = | payback period |
| PR = | = | the operating pressure of the rectifying column |
| PROP = | = | propylene glycol |
| Q = | = | fuel heating value |
| = | reboiler duty | |
| RR&BR = | = | the Mass flow ratio and the Mass reboiler ratio of the rectifying column |
| t = | = | time |
| TAC = | = | total annual cost |
| = | carbon tax | |
| TH = | = | the dehydration column |
| = | lower temperature limit | |
| = | lower temperature limit | |
| = | carbon emission rate |
Acknowledgments
The authors gratefully acknowledge that this work is supported by the National Natural Science Foundation of China (Grant Number 21676151).