Raw Material Control

• Strict Supplier Selection: Sinopec carefully selects suppliers of raw materials such as propylene monomer, catalysts, and additives. It establishes strict evaluation and auditing mechanisms for suppliers to ensure that the quality of incoming raw materials meets high standards134.
• Quality Inspection of Raw Materials: Thorough inspections and tests are conducted on raw materials upon receipt. For propylene monomer, impurities such as water, oxygen, sulfur, arsenic, and carbon monoxide are strictly monitored and controlled, as these impurities can affect the activity of the catalyst and the quality of the final product. Any raw materials that do not meet the quality requirements are rejected134.

Production Process Optimization

• Advanced Production Technology: Sinopec employs advanced polymerization technologies, such as the Spheripol process and SPG-II process, which provide better control over the polymerization reaction, resulting in more stable product quality. These technologies enable precise regulation of reaction conditions such as temperature, pressure, and residence time13.
• Process Parameter Control: During production, key parameters such as the hydrogen concentration in the reactor, the ratio of catalyst to monomer, and the reaction temperature are closely monitored and adjusted in real-time. For example, by accurately controlling the hydrogen addition amount, the melt flow rate (MFR) of polypropylene can be effectively regulated, ensuring the consistency of product performance134.
• Use of Automation and Control Systems: Sinopec’s production plants are equipped with advanced automation and process control systems, such as AspenTech’s polymer process control solution and Pavilion Technologies’ model predictive control technology. These systems can optimize production processes, reduce variability in reactor operations, and improve product consistency. They also enable rapid detection and correction of any deviations from the set process parameters, ensuring the stability of product quality.