| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 106 === This study designs plant-wide process for styrene-acrylonitrile (SAN) copolymers. In the literature of polymer simulation, most of the processes were focused on single monomer polymerization. Few studies discussed the simulation of two monomers copolymerization. This study also researches thermodynamics and kinetics for SAN copolymers.
This plant-wide process can divide into six zones: reaction zone, devolatilizer zone, vacuum recovery zone, wastewater zone, oligomers removal zone and DMF removal zone. This study designs steady-state model and improves each zone. Finally, the dynamics scheme is developed for autorefrigerated reactor. It can use the throughput disturbance to realize control response. During shutdowns, it can explore the maximum pressure and temperature in the reactor.
The result of steady-state simulation shows that the reaction zone uses autorefrigerated reactor can eliminate the internal coil equipment; Devolatilizer zone demonstrates the properties of SAN copolymers in the simulation are close to the realistic; The excess monomers and solvent are recovered by water in the vacuum recovery zone; Wastewater zone can extract 99.8 wt% water; Oligomers removal zone recovers 90 wt.% oligomers; The purity of DMF achieves 99.6 wt.% in the DMF removal zone. To reduce the complexity of the process proposes the design that the excess monomers and solvent are recovered by recovery monomers in the vacuum recovery zone. Meanwhile, this proposal design can remove wastewater zone. The result of dynamics simulation shows that the reaction heat can be taken away by autorefrigeration when the ±20% throughput disturbance. During shutdowns, the maximum temperature achieves 178 ℃ and the maximum pressure achieves 4.09 kg/cm2g. This result can be a reference when design the reactor equipment.
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