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Pyrolysis of waste oils for the production of biofuels: A critical review
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2021-10-01 , DOI: 10.1016/j.jhazmat.2021.127396
Guangcan Su , Hwai Chyuan Ong , M. Mofijur , T.M. Indra Mahlia , Yong Sik Ok

The application of waste oils as pyrolysis feedstocks to produce high-grade biofuels is receiving extensive attention, which will diversify energy supplies and address environmental challenges caused by waste oils treatment and fossil fuel combustion. Waste oils are the optimal raw materials to produce biofuels due to their high hydrogen and volatile matter content. However, traditional disposal methods such as gasification, transesterification, hydrotreating, solvent extraction, and membrane technology are difficult to achieve satisfactory effects owing to shortcomings like enormous energy demand, long process time, high operational cost, and hazardous material pollution. The usage of clean and safe pyrolysis technology can break through the current predicament. The bio-oil produced by the conventional pyrolysis of waste oils has a high yield and HHV with great potential to replace fossil fuel, but contains a high acid value of about 120 mg KOH/g. Nevertheless, the application of CaO and NaOH can significantly decrease the acid value of bio-oil to close to zero. Additionally, the addition of coexisting bifunctional catalyst, SBA-15@MgO@Zn in particular, can simultaneously reduce the acid value and positively influence the yield and quality of bio-oil. Moreover, co-pyrolysis with plastic waste can effectively save energy and time, and improve bio-oil yield and quality. Consequently, this paper presents a critical and comprehensive review of the production of biofuels using conventional and advanced pyrolysis of waste oils.



中文翻译:

用于生产生物燃料的废油热解:批判性评论

废油作为热解原料生产高品质生物燃料的应用受到广泛关注,这将使能源供应多样化,并解决废油处理和化石燃料燃烧带来的环境挑战。废油因其高氢和挥发性物质含量而成为生产生物燃料的最佳原料。然而,传统的气化、酯交换、加氢处理、溶剂萃取、膜技术等处置方法存在能源需求大、工艺时间长、运行成本高、有害物质污染等缺点,难以取得满意的效果。使用清洁安全的热解技术可以突破目前的困境。废油常规热解制得的生物油收率高,HHV高,具有很大的替代化石燃料的潜力,但酸值较高,约为120 mg KOH/g。然而,CaO 和 NaOH 的应用可以显着降低生物油的酸值,使其接近于零。此外,添加共存双功能催化剂,特别是 SBA-15@MgO@Zn,可以同时降低酸值,对生物油的收率和质量产生积极影响。此外,与废塑料共热解可有效节省能源和时间,提高生物油产量和质量。因此,本文对使用传统和先进的废油热解生产生物燃料进行了批判性和全面的回顾。但含有约 120 mg KOH/g 的高酸值。然而,CaO 和 NaOH 的应用可以显着降低生物油的酸值,使其接近于零。此外,添加共存双功能催化剂,特别是 SBA-15@MgO@Zn,可以同时降低酸值,对生物油的收率和质量产生积极影响。此外,与废塑料共热解可有效节省能源和时间,提高生物油产量和质量。因此,本文对使用传统和先进的废油热解生产生物燃料进行了批判性和全面的回顾。但含有约 120 mg KOH/g 的高酸值。然而,CaO 和 NaOH 的应用可以显着降低生物油的酸值,使其接近于零。此外,添加共存双功能催化剂,特别是 SBA-15@MgO@Zn,可以同时降低酸值,对生物油的收率和质量产生积极影响。此外,与废塑料共热解可有效节省能源和时间,提高生物油产量和质量。因此,本文对使用传统和先进的废油热解生产生物燃料进行了批判性和全面的回顾。特别是 SBA-15@MgO@Zn,可以同时降低酸值,对生物油的产量和质量产生积极影响。此外,与废塑料共热解可有效节省能源和时间,提高生物油产量和质量。因此,本文对使用传统和先进的废油热解生产生物燃料进行了批判性和全面的回顾。特别是 SBA-15@MgO@Zn,可以同时降低酸值,对生物油的产量和质量产生积极影响。此外,与废塑料共热解可有效节省能源和时间,提高生物油产量和质量。因此,本文对使用传统和先进的废油热解生产生物燃料进行了批判性和全面的回顾。

更新日期:2021-10-19
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