Catalytic pyrolysis of biodegradable plastic in CO2 atmosphere using MSW incinerator bottom ash for PLA monomer recovery

IF 5.8 2区 化学 Q1 CHEMISTRY, ANALYTICAL Journal of Analytical and Applied Pyrolysis Pub Date : 2024-10-01 DOI:10.1016/j.jaap.2024.106839
Shuting Fu , Doeun Choi , Jechan Lee
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Abstract

This study proposes a method for recovering value-added monomers from abandoned biodegradable plastics such as used biodegradable straws (UBSs) by utilizing a catalyst made of bottom ash generated from municipal solid waste (MSW) incinerators. The MSW-derived bottom ash (MSW-BA) catalyst primarily comprises alkaline metal oxides such as CaO (58.88 wt%). Thermogravimetric and single-shot pyrolysis analyses show that polylactic acid (PLA) monomers—lactide and lactic acid—are the main products of UBS pyrolysis. We conducted catalytic pyrolysis of UBS at 500 °C under different atmospheres (N2 and CO2), with and without the MSW-BA catalyst. Compared with non-catalytic pyrolysis, the MSW-BA catalyst-based pyrolysis significantly increased the yield of PLA monomers in both N2 and CO2 environments. This is because the base sites present on the MSW-BA catalyst promoted the polymeric bond cleavage of PLA. The MSW-BA catalyst in CO2 achieved the highest recovery yield of PLA monomers (20.84 wt% per feedstock mass basis), which was approximately 17.75 % higher than that during non-catalytic UBS pyrolysis. The base sites present on the MSW-BA catalyst promoted polymeric bond cleavage of PLA, and the base-catalyzed pyrolysis of PLA was enhanced by the more reactive cleavage of the bond linkages in the presence of CO2. The proposed approach not only reuses biodegradable plastic waste but also utilizes the MSW treatment byproducts.
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利用城市生活垃圾焚烧炉底灰在二氧化碳气氛中催化热解生物可降解塑料以回收聚乳酸单体
本研究提出了一种利用城市固体废物(MSW)焚化炉产生的底灰为催化剂,从废弃的可生物降解塑料(如废旧可生物降解吸管(UBS))中回收增值单体的方法。城市固体废物产生的底灰(MSW-BA)催化剂主要由碱性金属氧化物组成,如 CaO(58.88 wt%)。热重分析和单次热解分析表明,聚乳酸(PLA)单体--内酰胺和乳酸--是 UBS 热解的主要产物。我们在不同的气氛(N2 和 CO2)下,在使用或不使用 MSW-BA 催化剂的情况下,在 500 °C 下对 UBS 进行了催化热解。与非催化热解相比,基于 MSW-BA 催化剂的热解在 N2 和 CO2 环境下都显著提高了聚乳酸单体的产量。这是因为 MSW-BA 催化剂上的碱基位点促进了聚乳酸聚合物键的裂解。在二氧化碳环境中,MSW-BA 催化剂获得了最高的聚乳酸单体回收率(20.84 wt%(按原料质量计)),比非催化 UBS 热解过程中的回收率高出约 17.75%。MSW-BA 催化剂上的碱基位点促进了聚乳酸聚合物键的裂解,在二氧化碳存在的情况下,碱催化的聚乳酸热解因键链的裂解反应更加活跃而得到加强。所提出的方法不仅重复利用了可生物降解的塑料废弃物,而且还利用了城市固体废弃物处理的副产品。
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来源期刊
CiteScore
9.10
自引率
11.70%
发文量
340
审稿时长
44 days
期刊介绍: The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.
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