Design of recycling system for poly(methyl methacrylate) (PMMA). Part 2 : process hazards and material flow analysis
Design of recycling system for poly(methyl methacrylate) (PMMA). Part 2 : process hazards and material flow analysis
复制标题
聚甲基丙烯酸甲酯（PMMA）回收系统设计。
DOI：
10.1007/s11367-013-0625-x
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
A. Sasaki
中科院分区：
文献类型：
--
作者：
Y. Kikuchi;M. Hirao;H. Sugiyama;S. Papadokonstantakis;K.Hungerbuehler;T. Ookubo;A. Sasaki
在这一系列的论文中，我们提出了一个设计的聚（甲基丙烯酸甲酯）（PMMA）的回收系统，考虑环境影响，化学危害，和资源的可用性。我们应用生命周期评估（LCA），环境，健康和安全（EHS）的评估，以及物质流分析的回收system.PurposeRecycling系统的评价高功能塑料，如PMMA还没有得到充分的研究。沿着含PMMA的产品如液晶显示器（LCD）的普及，PMMA的使用量稳步增加，这将导致未来几十年内更多的PMMA浪费。在这项研究中，热解过程中回收废聚甲基丙烯酸甲酯（MMA）单体的甲基丙烯酸甲酯（MMA），不仅考虑到一般的环境影响量化的生命周期评估，但也当地的环境，健康和安全的危害，和原材料availability.MethodsProcess EHS危害评估被施加到量化的PMMA单体回收过程的本地影响。工艺危害与化学物质的危险特性和工艺中的流条件密切相关。通过LCA和EHS评估，分析了两种冷却方式的差异。除了工艺危害之外，废PMMA的可用性必须是实施PMMA单体回收工艺的可行性的重要一点。可用量可以通过分析含PMMA产品的材料流来量化。液晶显示器中包含的PMMA作为导光板被选为一个可行的来源，废物PMMA，和PMMA流量的数量在社会evaluated.Results和discussionIn的情况下，PMMA，单体回收的过程中的危害比新鲜MMA的生产从原油。循环冷却水的实施可以显着降低PMMA热解过程中的化学危害。物料流分析表明，由于液晶电视需求高峰期的到来，未来20年废有机玻璃的供应量呈现波动趋势。的波动是强烈依赖于寿命的LCD television sets.ConclusionsPMMA单体回收有可能减少环境影响，减少过程危害比新鲜MMA生产原油。废有机玻璃的可得性与液晶电视机的寿命密切相关。多重和全面的评估可以揭示工艺技术的各个方面。
IntroductionIn this series of papers, we present a design of poly(methyl methacrylate) (PMMA) recycling system considering environmental impacts, chemical hazards, and resource availability. We applied life cycle assessment (LCA), environment, health, and safety (EHS) assessment as well as material flow analysis to the evaluation of the recycling system.PurposeRecycling systems for highly functional plastics such as PMMA have not been studied sufficiently. Along with the popularization of PMMA-containing products such as liquid crystal displays (LCDs), the use of PMMA is steadily increasing, which will result in more waste of PMMA in the next decades. In this study, pyrolysis process for recycling waste PMMA into methyl methacrylate (MMA) monomer was examined, considering not only general environmental impacts quantified by life cycle assessment but also local environment, health, and safety hazards, and raw material availability.MethodsProcess EHS hazards assessment was applied to quantify the local effects of the PMMA monomer recycling process. Process hazards are strongly connected with the hazardous properties of chemical substances and stream conditions within the process. Two alternative cooling methods exist, and their difference was analyzed by LCA and EHS assessment. Besides the process hazard, the availability of waste PMMA must be an important point for the feasibility of implementing the PMMA monomer recycling process. The available amount can be quantified by analyzing the material flow of PMMA-containing products. PMMA contained in LCDs as light guide panels was selected as a feasible source of waste PMMA, and the quantity of PMMA flows in the society was evaluated.Results and discussionIn the case of PMMA, monomer recycling has less process hazard than the production of fresh MMA from crude oil. The implementation of circulated cooling water could significantly decrease the process hazard in PMMA pyrolysis attributable to chemical hazards. Material flow analysis revealed that the availability of waste PMMA shows a fluctuating trend in the next 20 years because of the sharp peak demand for LCD television sets. The fluctuation is strongly dependent on the lifetime of LCD television sets.ConclusionsPMMA monomer recycling has a potential to reduce environmental impacts with a less process hazards than fresh MMA production from crude oil. The availability of waste PMMA has a strong relationship with the lifetime of LCD television sets. The multiple and comprehensive assessments can reveal various aspects of a process technology.