通过室温甲醇分解回收报废电机中的漆包铜线

IF 12.4 Q1 ENVIRONMENTAL SCIENCES Resources Environment and Sustainability Pub Date : 2023-12-22 DOI:10.1016/j.resenv.2023.100143
Samuel D. Widijatmoko , Zhehao (John) Cui , Hassan Agalit , Yongliang Li , Gary A. Leeke
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引用次数: 0

摘要

聚酯漆包铜线在电机制造中发挥着重要作用。随着交通电气化的发展,对电机的需求以及未来电机报废时产生的废弃物不容忽视。聚酯漆包铜线产生的废料预计将稳步增长。研究人员提出的方法主要集中在热处理上,即热解或烧掉聚酯漆包铜线。在本手稿中,我们提出了以二氯甲烷为助溶剂、K2CO3 为催化剂的甲醇洗涤和室温甲醇分解两阶段工艺,用于多层型漆包铜线的脱层。甲醇洗涤法通过溶解回收聚乙烯醇缩丁醛。而甲醇分解产物是对苯二甲酸二甲酯(DMT)和间苯二甲酸二甲酯(DMI),它们是聚酯的前体,可用于制造新的聚酯。在室温条件下,固液比、DCM 与甲醇的比例以及 K2CO3 与铜线的比例分别为 500 g/L、1.00 mol/mol 和 0.10 wt%,可在 24 小时内完全去除聚酯搪瓷。将温度提高 10 °C,可加快反应时间,从而在 4 小时内实现完全解聚。与热处理相比,所提议的方法所需的能量降低了 80.7%,且产物包含在溶液中。
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Recycling of enamelled copper wire from end-of-life electric motor via room temperature methanolysis

Polyester enamelled copper wire plays an important role in the manufacturing of electric motors. In line with the electrification of transport, the demand for electric motors and the future waste generated from their end-of-life cannot be ignored. The waste from the polyester enamelled copper wire is expected to increase steadily. Methods proposed by researchers are mainly focused on thermal treatment to either pyrolyse or burn off the polyester enamel. However, thermal treatments fail to consider the potential risk of air pollution and to recover the polyester enamel.

In this manuscript, we propose two-stage processes comprised of methanol washing and room temperature methanolysis with dichloromethane as co-solvent and K2CO3 as catalyst to delaminate multilayered type enamelled copper wire. The methanol washing recovers polyvinyl butyral as it is, via dissolution. Whereas the methanolysis products are dimethyl terephthalate (DMT) and dimethyl isophthalate (DMI) which are precursors to the polyester and could be used to make new polyester. At room temperature, the parameters of solid to liquid, DCM to methanol, and K2CO3 to Cuwire ratio, of 500 g/L, 1.00 mol/mol, and 0.10 wt%, respectively, allow complete removal of polyester enamel in 24 h. The methanolysis parameters described manage to give a modest DMT and DMI yield of 86.0% and 92.2%, respectively. The reaction time can be sped up by increasing the temperature by 10 °C, leading to complete depolymerisation in 4 h. Compared to thermal treatment, the proposed method requires 80.7% lower energy with the products contained within the solution.

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来源期刊
Resources Environment and Sustainability
Resources Environment and Sustainability Environmental Science-Environmental Science (miscellaneous)
CiteScore
15.10
自引率
0.00%
发文量
41
审稿时长
33 days
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