Integrated sustainability assessment for chemical processes

Policies on sustainable development have resulted in the wide concern about economic, safety, and environmental-friendly chemical production. This work focuses on the development of a holistic methodology that enables the evaluation and comparison of process sustainability in an integrated system. This methodology is proposed based on material and energy flows, process parameters, and process configuration. It uses a set of criteria, including inherent safety, potential environmental impact, and economic aspects. These criteria as the basis for determining the integrated index can be used to perform sustainability assessment for process alternatives under investigation. The multi-criteria decision analysis procedure is presented to conduct the integrated assessment based on qualitative and quantitative analysis. As a case study, ethanol production process, i.e., ethylene-derived feedstock process (A1) and straw cellulose-derived feedstock process (A2) are used to illustrate the proposed methodology. Results showed that A1 had advantage over A2 for the economic aspect while A2 had better performance in the environmental and safety aspects. A2 is the prior option from the point of view of comprehensive evaluation.