How do you use process analyzers for real-time optimization in refinery operations?

Refinery optimization with analyzers: product quality analyzers (NIR, GC for specifications - octane, RVP, distillation), blending optimization (real-time property measurement feeding blend controller), crude characterization (assay from online analyzers for unit optimization), and yield accounting (mass balance using flow and composition). Implementation: analyzer outputs to APC/optimizer, measurement validation and substitution data, control strategy for property giveaway minimization, and integration with planning/scheduling systems. Economics: property giveaway reduction (0.1 RON octane = millions $/year), energy optimization (furnace O2 trim), and improved yield. Requires: reliable analyzers, validated measurements, and coordinated control strategy.