Effects of the use of acetone as co-solvent on the financial viability of bio-crude production by hydrothermal liquefaction of CO2 captured by microalgae

IF 7.2 2区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY Journal of CO2 Utilization Pub Date : 2024-11-01 DOI:10.1016/j.jcou.2024.102960
David Ocampo , Elkin A. Gómez , Luis A. Ríos , Gabriel J. Vargas
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Abstract

Hydrothermal Liquefaction (HTL) is a promising technology to produce biocrude from microalgal biomass that has captured gaseous CO2. However, several problems of this technology must still be solved to make it economically and technically feasible. One of the main problems in the financial viability of the HTL process is the low yield obtained when only water is used as a solvent, with results close to or lower than 30 wt%. This, in turn, increases the production cost to over 120 USD/BBL. In recent years, some authors have focused their efforts on increasing biocrude production through the extensive use of organic solvents, without considering the effects on economic viability. The present work evaluated the financial effect of using acetone as an organic co-solvent, finding that high acetone contents increased operating costs of the process, mainly due to losses in its handling and recovery. On the contrary, very low acetone contents had very little effect on the biocrude yield. It was possible to establish that concentrations close to 5 wt% of acetone, mixed with water, resulted in a yield of about 60 wt% and a production cost of 50 USD/BBL of biocrude, with an energetic densification of 30.25 MJ/kg and 8.60 API, classifying it as heavy crude, which makes it necessary to include refining processes for heteroatom removal. Chemical characterization of biocrude revealed a high content of nitrogenous compounds (23.6 wt%) and oxygenated compounds (10.7 wt%), which have to be removed for the subsequent production of commercial liquid fuels. It is concluded that the use of a water-acetone mixture allows for obtaining positive operating profits, which helps to the high capital costs involved in this type of technology, making it more financially comparable with the conventional petroleum industry.
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使用丙酮作为助溶剂对通过热液液化微藻类捕获的二氧化碳生产生物原油的经济可行性的影响
水热液化(HTL)是一种利用捕获气态二氧化碳的微藻生物质生产生物原油的前景广阔的技术。然而,要使这项技术在经济和技术上可行,还必须解决它的几个问题。HTL 工艺在经济可行性方面的一个主要问题是,仅用水作为溶剂时,产量较低,接近或低于 30 wt%。这反过来又将生产成本提高到 120 美元/BBL 以上。近年来,一些学者致力于通过大量使用有机溶剂来提高生物原油的产量,但并未考虑其对经济可行性的影响。本研究评估了使用丙酮作为有机辅助溶剂的经济效果,发现丙酮含量高会增加工艺的运营成本,主要原因是丙酮处理和回收过程中的损失。相反,极低的丙酮含量对生物原油产量的影响很小。可以确定的是,丙酮浓度接近 5 wt%(与水混合)时,生物原油的产量约为 60 wt%,生产成本为 50 美元/BBL,能量密度为 30.25 MJ/kg,API 为 8.60∘,属于重质原油,因此必须采用精炼工艺去除杂原子。生物原油的化学特征显示,含氮化合物(23.6 重量%)和含氧化合物(10.7 重量%)的含量较高,必须去除这些物质才能生产商业液体燃料。结论是,使用水-丙酮混合物可以获得积极的经营利润,这有助于降低这类技术所涉及的高昂资本成本,使其在财务上与传统石油工业更具可比性。
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来源期刊
Journal of CO2 Utilization
Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.90
自引率
10.40%
发文量
406
审稿时长
2.8 months
期刊介绍: The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.
期刊最新文献
Liquid-phase CO2 hydrogenation to methanol synthesis: Solvent screening, process design and techno-economic evaluation Evolution law of the pore structure of CO2-H2O-coal in liquid CO2-ECBM Effects of the use of acetone as co-solvent on the financial viability of bio-crude production by hydrothermal liquefaction of CO2 captured by microalgae Reactivity of aqueous carbonated cement pastes: Effect of chemical composition and carbonation conditions Recent advancements in integrating CO2 capture from flue gas and ambient air with thermal catalytic conversion for efficient CO2 utilization
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