ADVANCED PROCESS CONTROL APC uses a model-based predictive control technology that drives the process towards the desired targets through the manipulation of several variables simultaneously while observing all process constraints. APC has a proven track record in delivering business objectives: reducing energy costs, increasing yields and improving operability. Axens’ Performance Programs Business Unit provides S², our State Space APC suite, designed to efficiently implement and maintain plant-wide APC applications. The benefits of these applications have been fully demonstrated on several plants. Figure 1: APC Overview: Plant / PID / DCS / APC AXENS’ KNOW-HOW As a process licensor and catalyst supplier, Axens is well positioned to offer models and first-hand knowledge of the best strategies for APC projects. Axens provides services covering all phases of APC projects, including: • Detailed functional design • Implementation • Commissioning • Maintenance CONTROL STRATEGY Our control strategy for Prime-G+ (shown by Figure 2) consists of: • SHU: Diolefins hydrogenation - Adjustment of hydrogen make-up - Control of temperature profile • Splitter - Cutpoint and reboiler duty optimization - Precise control of Light Cut Naphtha (LCN) sulfur • Selective HDS - Precise control of Heavy Cut Naphtha (HCN) sulfur - Maximization of octane retention • HCN+LCN blend sulfur control • CO 2 constraints management. APC for Prime-G+™ A LICENSOR SOLUTION THAT INTEGRATES MODELS, CONTROL STRATEGY & THE APC TOOLBOX Figure 2: Control objectives for Prime-G+ APC Control Control Diolefin Diolefin Hydrogenation Hydrogenation Control Control Diolefin Diolefin Hydrogenation Hydrogenation Cut Point Optimization & Cut Point Optimization & Internal Reflux Control Internal Reflux Control Cut Point Optimization & Cut Point Optimization & Internal Reflux Control Internal Reflux Control Maximization of Maximization of Octane retention Octane retention Maximization of Maximization of Octane retention Octane retention Sulfur Sulfur control control Sulfur Sulfur control control HCN Feed S H U Prime-G+ Selective HDS Blend Blend H 2 Make-up S P L I T T E R LCN