MATHEMATICAL MODELING & DYNAMICS STUDY OF BATCH CRYSTALLIZER FOR PURIFIED TEREPHTHALIC ACID (PTA) CRYSTALLIZATION PROCESS USING GPROMS

Abstract

Crystallization is a complex and critical chemical engineering process which is carried out for high purity products in process industry. Purified Terephthalic Acid (PTA) is commodity chemical, it is principal raw material mainly used in Polyester industry. During production process of Purified Terephthalic Acid (PTA), crystallization process is used to separate crystals from water. Crystalline materials generally have a high degree of purity even when obtained from a relatively impure solution. Control of crystal size distribution (CSD) is an end objective in PTA crystallization process. To fulfill CSD, needs the mathematical model based optimization for PTA unit, developed mathematical model is solved in gPROMS (general PROcess Modeling System).In present work, research achievement are batch crystallization modeling, simulation, optimization & parameter estimation. Within the proposed control strategy, a dynamic optimization is performed to obtain optimal cooling temperature profile of batch crystallizer, maximizing the total volume of seeded crystals. Simulation is implemented to track the resulting optimal temperature profile.