Numerical sensitivity analysis of temperature‐dependent reaction rate constants for optimized thermal conversion of high‐density plastic waste into combustible fuels

Author:

Irfan Muhammad1,Nabi Rao Adeel Un2,Hussain Hammad3,Naz Muhammad Yasin2,Shukrullah Shazia2,Khawaja Hassan Abbas4,Rahman Saifur1,Althobiani Faisal5

Affiliation:

1. Electrical Engineering Department; College of Engineering Najran University Najran Saudi Arabia

2. Department of Physics University of Agriculture Faisalabad Faisalabad Pakistan

3. Department of Agricultural Engineering, Faculty of Agricultural Engineering & Technology University of Agriculture Faisalabad Faisalabad Pakistan

4. Department of Automation and Process Engineering UiT The Arctic University of Norway Tromsø Norway

5. Faculty of Maritime Studies King Abdulaziz University Jeddah Saudi Arabia

Abstract

AbstractThe use of experimental rate constants for producing a high yield of liquid fuels from the pyrolysis of plastic waste is not widely accepted owing to a lack of compatibility between the different kinetic rate constants responsible for successful conversion reactions. In R software, the Arrhenius law can forecast the ideal combination of reaction rate constants and frequency factors and then perform sensitivity analysis on individual rate constants to estimate the selectivity and quantity of primary pyrolysis products. Sensitivity analysis is a way of determining the effectiveness of individual rate constants in the reaction. This research element is currently lacking in the literature for the cost‐effective valorization of plastics into combustible fuels. We are the first to use R software to perform sensitivity analysis on specific rate constants by reducing or raising their initial values to a point where maximum oil yield is attainable in the temperature range of 340–370°C. The primary focus was to save time and cost of extracting empirical rate constants from experiments to produce commercial‐scale pyrolytic oil. The H‐abstraction, chain fission, polymerization, and scission reactions were chosen due to the high availability of free radicals for maximum oil production. The oil recovery rate improved drastically to 90% at the end of processing time, while the number of by‐products gradually decreased. The k8 rate constant driven reaction is the best‐suited condition for industrial‐scale pyrolysis of high‐density plastics into liquid fuels, with 74% improvement in oil production and 14% improvement in light wax during sensitivity analysis.

Funder

Najran University

Publisher

Wiley

Subject

General Chemical Engineering

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