Abstract In order to improve the combustion of pyrolysis oil, recovery of low brominated and lightweight oil was investigated through the pyrolysis of waste printed circuit boards (WPCBs) with the addition of Fe 3 O 4 and 4A (Si-Al zeolite). Variations in the pyrolysis process were studied via by analyses of TG/MS data, three-phase pyrolysis product distributions, organic bromine content, oil content and heat value (HV), the number distribution of carbon atoms and oil composition of experimental product fractions. Results show that the pyrolysis of WPCBs can be divided into three stages: first stage (≤280 ℃), decomposition stage (280–500 ℃) and stabilization stage (≥500 ℃), according to the TG/DTG curve. Phenol, 2-methyl phenol, and 2,6-dimethyl phenol were the major products based on the MS data. The liquid product was improved to 30%, the HV was 33.27 MJ/kg, and the organic bromine content was reduced to 10.45 mg/g. Moreover, the number distribution of carbon atoms showed that the oil had more C6, C9 and C12 fractions, and less C15 fraction. The main components of oil were phenol, phenol,4-(1-methylethyl)-, and phenol,4,4′-(1-methylethylidene)bis-. The oil produced in this way has more potential in combustion and other fields.

中文翻译：

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WPCBs与复合添加剂共热解两段热解热解油的改进

摘要 为提高热解油的燃烧性能，研究了通过添加Fe 3 O 4 和4A（Si-Al沸石）热解废印刷电路板（WPCBs）回收低溴轻质油。通过分析 TG/MS 数据、三相热解产物分布、有机溴含量、油含量和热值 (HV)、碳原子数分布和实验产物馏分的油组成来研究热解过程的变化。结果表明，根据TG/DTG曲线，WPCBs的热解可分为三个阶段：第一阶段（≤280℃）、分解阶段（280-500℃）和稳定阶段（≥500℃）。根据 MS 数据，苯酚、2-甲基苯酚和 2,6-二甲基苯酚是主要产物。液体产品提高到30%，HV 为 33.27 MJ/kg，有机溴含量降至 10.45 mg/g。此外，碳原子数分布表明，油中C6、C9和C12馏分较多，C15馏分较少。油脂的主要成分为苯酚、苯酚、4-(1-甲基乙基)-和苯酚、4,4'-(1-甲基亚乙基)双-。以这种方式生产的石油在燃烧和其他领域具有更大的潜力。