Integrated Scheduling for Polyvinyl Chloride Processes

Abstract

This study considers a scheduling algorithm and mathematical models for a real polyvinyl chloride (PVC) plant. According to general rules of the PVC plant, the basic PVC scheduling model is formulated as mixed integer linear programming (MILP). This model includes production, inventory management, packing, and shipment processes. The basic PVC scheduling model is customized for two PVC production processes with different characteristics, resulting in two detailed PVC scheduling models. An optimization algorithm has been developed to solve these scheduling models. This algorithm is a hybrid algorithm combining the genetic algorithm for integer programming (IP) and the interior point method for linear programming (LP). A heuristic technique has also been developed to reduce the number of solving LPs. Finally, the optimized results of the models were analyzed.

Piecewise Linear Approximation Based MILP Method for PVC Plant Planning Optimization

“…In the field of PVC process optimization, the existing results mainly focused on the PVC polymerization process to delivery process . Tian et al addressed the integrated scheduling problem but only considered the material processing system. − In the recent result, Wang et al proposed a plantwide MINLP model to solve the planning optimization considering both material processing and utility systems, but this model is very hard to solve because of the nonlinear characteristics .…”

Multiperiod Planning of a PVC Plant for the Optimization of Process Operation and Energy Consumption: An MINLP Approach

“…6 Moreover, the problems of polymerizing production, storage, packaging, and transportation process for PVC process optimization were studied considering inventory cost and demand delay cost. 1 Integrated scheduling for PVC production considering calcium carbide production, brine electrolysis process and polymerization of VCM was studied and an MILP model was constructed. [7][8] The existing results of PVC production optimization mainly focused on PVC polymerization process to delivery process and few considered VCM production process.…”

“…Polyvinyl chloride (PVC) is a major commercial polymer and is widely used as a raw material in various chemical and petrochemical products . PVC production by calcium carbide method is mainly adopted in China which accounts for 76.2% share, because of the abundance in coal and shortage of gas and oil .…”

“…Then a mixed integer linear programming (MILP) model for multistage polymer plants was introduced considering changeover cost, inventory cost, and back-logging cost in PVC reaction, extrusion, and packaging stages aiming at maximizing total profit . Moreover, the problems of polymerizing production, storage, packaging, and transportation process for PVC process optimization were studied considering inventory cost and demand delay cost . Integrated scheduling for PVC production considering calcium carbide production, brine electrolysis process and polymerization of VCM was studied and an MILP model was constructed. , The existing results of PVC production optimization mainly focused on PVC polymerization process to delivery process and few considered VCM production process.…”

“…Polyvinyl chloride (PVC) is a major commercial polymer and is widely used as a raw material in various chemical and petrochemical products. 1 PVC production by calcium carbide method is mainly adopted in China which accounts for 76.2% share, because of the abundance in coal and shortage of gas and oil. 2 However, the calcium carbide method is known to be energy intensive, resulting in high energy consumption, high cost, and serious pollution problem.…”