<b>Decisions Optimization Related to the Production Within Refining and Petrochemical Industry</b> The paper underlines the use of quantitative analyses and mathematical models to optimize the decision within companies from oil and gas industry. It will be presented a case study from a refinery that use RPMS Refinery and Petrochemical Modeling System software for optimizing LPG blends. mathematical models, optimal solution, computer software, RPMS, oil and gas industry 1094-1101 Issue-1 Volume-3 Catalin Popescu