Perpustakaan Digital ITB

The global priority to manage greenhouse gas emissions has positioned the oil refinery as a critical target in Indonesia’s national strategy to achieve Net Zero Emissions (NZE) by 2060. Oil refineries are among the highest industrial contributors to CO? emissions, and one of the most promising approaches to address this challenge is the implementation of Carbon Capture and Utilization (CCU) technologies. However, selecting the most suitable CCU product requires a comprehensive and systematic evaluation, as multiple technical, economic, and environmental criteria must be considered, often under conditions of uncertainty and conflicting expert opinions. This study proposes a structured decision-making framework using a combination of the Interval Type-2 Fuzzy Analytic Hierarchy Process (IT2FAHP) and the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). The IT2FAHP method is employed to determine the importance weights of nine criteria, distributed across three main categories: technical performance, economic feasibility, and environmental impact. These criteria include Enthalpy of Chemical Reaction (H), Gibbs Energy (G), Technical Readiness Level (TRL), Return on Investment (ROI), Compound Annual Growth Rate (CAGR), Market Value (MV), Carbon Dioxide Utilization Ratio (CDUR), Atomic Efficiency (AE), and Environmental Science Relevance (ESE). Expert judgment was gathered from ten professionals at PT Kilang Pertamina Internasional, incorporating a wide range of perspectives across engineering, project planning, operation and sustainability roles. The fuzzy nature of the IT2FAHP allows for handling the ambiguity in linguistic evaluations such as “high importance” or “moderate significance,” which vary between individuals. The resulting criteria weights were then applied in the TOPSIS method to rank ten CCU product alternatives based on their relative closeness to an ideal solution. The analysis identified Return on Investment (15.1%), Carbon Dioxide Utilization Ratio (13.5%), and Compound Annual Growth Rate (12.7%) as the top three most influential criteria. The top-ranked alternatives are ethanol, methane, and methanol that reflecting the balance of technical, economic and environment aspects.