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Design of Pressure Swing Adsorption for Production of Diesel from Plastic Waste with Production Capacity of 10 Tons Per Day via Aspen Hysys
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This paper designed a system to turn plastic waste into diesel fuel, processing 10 tons per day. Using computer modeling, researchers calculated that a pressure swing adsorption unit could recycle nitrogen gas needed for the process, producing gas that was 99.5% pure with 98% recovery.
The pyrolysis of plastic waste to diesel provides a solution for environmental pollution by making plastic waste a valuable resource with the potential to generate an economic profit. Constant nitrogen purging in the pyrolysis reactor is required to ensure maximum conversion of plastic to fuel. Pressure swing adsorption (PSA) is the best method due to its adaptability and being economically friendly. With Carbon Molecular Sieve as the chosen adsorbent and an operating condition of 12 bar and 25°C, the mass of adsorbent required is determined to be 1374 kg. The PSA of 5.0 340 m high and diameter of 1.5 m is capable of producing 1560 kmol/h of nitrogen gas with a purity of 99.5% and recovery of 98%. These values are determined via calculation.
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An integrated pyrolysis-steam reforming process for waste polyethylene, polypropylene, and polystyrene can produce approximately 651 kg of hydrogen per hour with a 39% internal rate of return and under 6-year payback, demonstrating economic viability for plastic-to-energy conversion. This chemical recycling pathway offers a scalable route for diverting plastic waste that would otherwise fragment into environmental microplastics, addressing pollution at the source.
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Researchers developed a mathematical model for the pyrolysis of polypropylene — a major component of plastic waste — and simulated the industrial process using chemical engineering software. This modeling supports developing efficient systems to convert waste plastic into useful fuels and chemicals.
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Researchers used Aspen Plus process simulation to optimize pyrolysis of mixed plastic waste, finding that fuel production peaks at 460°C and 1 bar while hydrogen production via integrated steam reforming peaks at 700°C, with heat integration substantially cutting external energy demand—though economic viability remained tightly dependent on feedstock throughput.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.