PMMA 壓克力廢塑料回收的熱裂解工業製程開發與優化

Abstract

本研究顯示年處理量10,000噸之PMMA 壓克力廢料回收之熱裂解工業製程具有顯著的潛力。這項研究的重要突破克服了傳統建模方法的限制。透過整合反應動力學、熱力學和流體力學，所開發的反應模型對PMMA熱裂解過程提供了全面的分析。它可以評估操作參數及其影響，優化從PMMA廢料中回收MMA的過程，同時最小化能源消耗，並進一步擴大PMMA廢料處理的規模。 例如，此模型觀察到將初始加熱砂料進料溫度保持在950K可以防止不必要的MMA分解和副產物生成，同時實現最佳的PMMA轉化。最佳的砂料進料質量流速為8公斤/秒，氣體進料質量流速的最佳值為1公斤/秒。在這個範圍內操作確保了理想的MMA轉化率和後續步驟中氣固分離的最低成本。與工業上廣泛使用的ACH法生產MMA相比，這項研究透過PMMA熱裂解展示了每噸MMA的能源消耗較低的結果為4.91 GJ，低於工業ACH法的兩倍。這突顯新開發的流化床反應器在生產MMA中的潛力。 考慮到永續廢棄物管理製程的重要性，這些研究結果有助於開發高效且環保的PMMA廢料回收處理製程。在這一領域進一步的研究將推動PMMA廢料處理的進步，並支持向循環經濟的轉型。

This PMMA pyrolysis process holds significant potential for effectively managing PMMA waste, aiming to handle 10,000 tons per year. One notable breakthrough of this research is the overcoming of limitations associated with traditional modeling approaches. By integrating reaction kinetics, thermodynamic considerations, and Fluidynamics, the developed model provides a comprehensive understanding of the PMMA pyrolysis process. It enables the evaluation of operational parameters and their impact, facilitating informed decisions to optimize MMA recovery from PMMA waste while minimizing energy consumption, and further scaling up the PMMA waste management process. For example, it has been observed that maintaining the initial sand feed temperature at 950K prevents undesired MMA decomposition and byproduct formation, while achieving the best PMMA conversion. The optimal sand feed mass flow rate is 8 kg/s, and the gas feed mass flow rate has an optimal value of 1 kg/s. Operating within this range ensures desirable MMA conversion and the lowest cost for gas-solid separation in subsequent steps. In comparison to the widely used ACH process for MMA production, this research demonstrates a more favorable energy consumption outcome of 4.91 GJ per ton of MMA through PMMA pyrolysis, which is twice as low as the energy consumption of the industrial ACH process. This highlights the potential of the newly developed entrained flow reactor for MMA production. Considering the importance of sustainable waste management, these findings contribute to the development of efficient and environmentally friendly PMMA waste recycling processes. Further research in this field will advance PMMA waste management and support the transition to a circular economy.