The most efficient method for synthesizing polystyrene from styrene monomer at a large scale while minimizing waste and maximizing yield is through suspension polymerization.Suspension polymerization is a widely used industrial process for producing polystyrene due to its several advantages:1. High yield: Suspension polymerization allows for high conversion rates of styrene monomer to polystyrene, typically over 90%.2. Good heat transfer: The process involves dispersing the styrene monomer in an aqueous phase containing stabilizers and initiators. This water-based system provides efficient heat transfer, preventing localized overheating and ensuring uniform polymerization.3. Easy separation: The resulting polystyrene beads can be easily separated from the aqueous phase by filtration or centrifugation, reducing waste and simplifying the purification process.4. Control over particle size: By adjusting the agitation rate, stabilizer concentration, and other process parameters, the size of the polystyrene beads can be controlled, allowing for the production of various grades of polystyrene with different properties.5. Scalability: Suspension polymerization can be easily scaled up for large-scale production, making it suitable for industrial applications.To further minimize waste and maximize yield, the following steps can be taken:1. Optimize reaction conditions: Carefully control the temperature, pressure, and agitation rate to ensure high conversion rates and minimize side reactions.2. Use high-quality raw materials: Employ high-purity styrene monomer and initiators to reduce impurities and improve the overall yield.3. Recycle unreacted monomer: Recover and recycle any unreacted styrene monomer to reduce waste and improve the overall efficiency of the process.4. Efficient purification: Optimize the separation and purification steps to minimize the loss of polystyrene beads and reduce the amount of waste generated.5. Waste management: Implement proper waste management practices to minimize the environmental impact of the process, such as treating wastewater and recycling or disposing of solid waste responsibly.