Hydrothermal liquefaction of southern yellow pine with downstream processing for improved fuel grade chemicals production

IF 7.1 Q1 ENERGY & FUELS
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引用次数: 0

Abstract

The hydrothermal liquefaction (HTL) technique for liquefying lignocellulose biomass feedstock is often associated with low biocrude yield and poor fuel properties. This study examined the HTL of southern yellow pine sawdust and the hydrotreatment (HYD) of produced biocrudes in an effort to address these challenges. Pine HTL treatment was performed within water and water–ethanol mixed reaction medium at 250, 300, and 350℃ temperatures using metallic iron (Fe) as a catalyst. The rising reaction temperature in a water medium and increasing ethanol content in a mixed reaction medium were found to be effective in enhancing the biocrude yield from the non-catalytic pine HTL process. Maximum non-catalytic biocrude yield of 18 wt.% was produced in water at 350℃, whereas the ethanol and water (1:1 on mass basis) mixture generated the highest biocrude yield of 34 wt.% at 300℃ without any catalyst. The iron catalyst facilitated a maximum of 29 wt.% of biocrude yield as opposed to 18 wt.% without the catalyst at 350℃ in water. The use of an iron catalyst also raised the calorific value of produced biocrudes by 2.5–14 % within 250-350℃ in both water and water–ethanol media. The catalytic and non-catalytic biocrude products were chosen to undergo HYD treatment at 400 °C under high hydrogen pressure (initial 1000 psi) using an alumina-supported cobalt-molybdenum catalyst. The HYD treatment reduced the oxygen content of upgraded oils by 36–60 % compared to the parent HTL biocrudes with 35–37 MJ/kg calorific values. The simulated distillation detected the maximum gasoline range compounds in upgraded oil from catalyst and water–ethanol conditions, whereas the GC–MS analysis revealed the production of increased aromatic hydrocarbons in all upgraded HYD oils. This work has demonstrated the potential of ethanol and inexpensive iron catalyst in enhancing the biocrude production from pine, which could be upgraded to better fuel using the HYD process.

Abstract Image

水热液化南方黄松并进行下游加工以提高燃料级化学品产量
用于液化木质纤维素生物质原料的水热液化(HTL)技术往往与生物原油产量低和燃料性能差有关。本研究考察了南方黄松锯屑的水热液化和所生产生物原油的加氢处理 (HYD),旨在解决这些难题。以金属铁(Fe)为催化剂,在 250、300 和 350℃的水和水乙醇混合反应介质中进行了松木热液化处理。研究发现,提高水介质中的反应温度和增加混合反应介质中的乙醇含量可有效提高非催化松木热液化工艺的生物原油产量。水介质在 350℃时产生的非催化生物原油产量最高,为 18%,而乙醇和水(质量比为 1:1)混合物在 300℃时产生的生物原油产量最高,为 34%,且不含任何催化剂。在 350℃的水中,铁催化剂可使生物原油产量达到最高的 29 重量百分比,而不使用催化剂时仅为 18 重量百分比。在 250-350℃ 的水介质和水乙醇介质中,使用铁催化剂还可将生产的生物原油的热值提高 2.5-14%。催化和非催化生物原油产品被选中在 400 °C 的高压氢气环境下(初始压力为 1000 psi),使用氧化铝支撑的钴钼催化剂进行 HYD 处理。与热值为 35-37 兆焦耳/千克的母 HTL 生物馏分油相比,HYD 处理使升级油的氧含量降低了 36-60%。模拟蒸馏检测出催化剂和水-乙醇条件下的升级油中汽油范围的化合物最多,而气相色谱-质谱分析表明,所有 HYD 升级油中产生的芳香烃都有所增加。这项工作证明了乙醇和廉价铁催化剂在提高松木生物原油产量方面的潜力,松木生物原油可通过 HYD 工艺升级为更好的燃料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
8.80
自引率
3.20%
发文量
180
审稿时长
58 days
期刊介绍: Energy Conversion and Management: X is the open access extension of the reputable journal Energy Conversion and Management, serving as a platform for interdisciplinary research on a wide array of critical energy subjects. The journal is dedicated to publishing original contributions and in-depth technical review articles that present groundbreaking research on topics spanning energy generation, utilization, conversion, storage, transmission, conservation, management, and sustainability. The scope of Energy Conversion and Management: X encompasses various forms of energy, including mechanical, thermal, nuclear, chemical, electromagnetic, magnetic, and electric energy. It addresses all known energy resources, highlighting both conventional sources like fossil fuels and nuclear power, as well as renewable resources such as solar, biomass, hydro, wind, geothermal, and ocean energy.
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