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Life Cycle Assessment and Multiobjective Optimization for Steam Cracking Process in Ethylene Plant.

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This study introduces a life cycle assessment (LCA) framework to optimize ethylene production, balancing economic benefits and environmental impacts. The LCA-based approach proves superior to traditional energy cost models for industrial sustainability.

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Area of Science:

  • Chemical Engineering
  • Environmental Science
  • Industrial Ecology

Background:

  • Growing emphasis on energy savings and emission reduction in industrial policies.
  • Limited focus on the upstream environmental impacts (feedstock extraction, processing, transport) of industrial production.
  • Need for integrated approaches to assess and mitigate industrial environmental footprints.

Purpose of the Study:

  • To propose an integrated multiobjective optimization framework for steam cracking processes.
  • To develop and compare economic-environmental optimization models using life cycle assessment (LCA) and data-driven methods.
  • To evaluate the trade-off between economic benefits and environmental impacts in ethylene production.

Main Methods:

  • Life Cycle Assessment (LCA) integrated with data-driven modeling.
  • Development of a multiobjective economic-environmental optimization model.
  • Comparative analysis with a standard energy cost model.
  • Utilization of the nondominated sorting genetic algorithm-II (NSGA-II) for optimization.
  • An industrial case study for validation.

Main Results:

  • The LCA-based optimization framework effectively integrates upstream and process-specific environmental impacts.
  • The proposed method demonstrates a superior representation of environmental impacts compared to the standard energy cost model.
  • The nondominated sorting genetic algorithm-II successfully identified Pareto optimal solutions.
  • The industrial case study confirmed the practical applicability and effectiveness of the developed framework.

Conclusions:

  • The LCA-based optimization framework provides a more comprehensive assessment of environmental impacts in steam cracking.
  • The method enables a better balance between economic performance and environmental sustainability in ethylene production.
  • This approach offers valuable guidance for environmentally conscious industrial decision-making and policy implementation.