Journal
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
Volume 148, Issue -, Pages 462-472Publisher
ELSEVIER
DOI: 10.1016/j.psep.2020.10.033
Keywords
Ternary azeotropic mixtures; Vapor recompression; Extraction distillation; Energy saving; Economic optimization
Categories
Funding
- National Natural Science Foundation of China [21676152, 21776145, 21808117]
- Taishan Scholar Young Talent Program [tsqn201909114]
- Qingdao science and technology benefiting people special project [18-6-1-99-nsh]
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The combination of vapor recompression technology and extractive distillation technology in treating wastewater containing benzene/n-propanol can improve energy efficiency, reduce gas emissions, and enhance economic performance, demonstrating its advantages in environmental protection and energy saving.
N-propanol and benzene are important chemical organic compounds, which widely exist in wastewater of chemical industry, medicine and other fields. Because they form azeotrope with water, extractive distillation was used to separate them. In order to increase the efficiency of energy utilization, vapor recompression technology was added on the basis of extractive distillation. On the basis of vapor recompression assisted extractive distillation, energy integration was carried out according to pinch technology, and the optimal energy utilization method was found. The exergy loss and gas emission of each process were studied and analyzed. The results show that the vapor recompression assisted distillation process with feed preheating can reduce the heat duty and gas emissions, and improve exergy efficiency and economic performance. Therefore, the vapor recompression assisted distillation process with feed preheating can effectively treat the wastewater containing benzene / n-propanol. It has the advantages of low cost, energy saving and environmental protection, which is of great significance to the development of environmental protection industry. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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