Stringent environmental regulations are driving advancements in sulfur removal, gas sweetening & carbon capture in refining to reduce harmful emissions and improve fuel quality. Hydrodesulfurization (HDS) and amine-based gas sweetening processes are enhancing the removal of sulfur compounds from crude oil and natural gas streams. Emerging adsorption and membrane separation techniques are improving efficiency while minimizing operational costs. Carbon capture integration in refineries is further reducing greenhouse gas emissions by trapping CO2 from flue gases. As refineries strive to meet ultra-low sulfur fuel standards and net-zero targets, innovation in process optimization and catalytic efficiency is essential for sustainable refining operations.