This work presents a new conceptual design of an industrial complex that integrates multiple manufacturing processes: green hydrogen production, syngas generation, CO₂ conversion to methanol, and biodiesel synthesis. The integrated system consists of four interconnected subsystems: (i) an alkaline water electrolysis process (AWEP), (ii) a reverse water-gas shift process (RWGSP), (iii) a methanol synthesis process (MSP), and (iv) a biodiesel synthesis process (BSP). Green hydrogen and oxygen are first generated through the AWEP subsystem. The produced hydrogen is then used in the RWGSP subsystem to convert CO₂ into syngas, which subsequently feeds the MSP subsystem to produce methanol. After that, the synthesized methanol reacts with vegetable oils and caustic sodium in the BSP subsystem to produce biodiesels as the main product and glycerin as a byproduct. Thus, this industrial complex will utilize the major feedstock of water, vegetable oils, caustic sodium, and CO2 with the support of renewable energy to produce biodiesel, methanol, and pure O2. Thus, this integrated industrial complex not only facilitates the production of sustainable diesel and methanol but also provides a carbon-negative pathway for CO2 utilization. The entire industrial complex is powered by renewable energy sources, featuring its environmental and energy supply sustainability. Comprehensive process simulation and techno-economic analysis have been performed using Aspen Plus V14 to demonstrate the technical and economic efficacies of the proposed industrial complex.
