Near-Critical CO2-Assisted Liquefaction-Extraction of Biomass and Wastes to Fuels and Value-Added Products

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
Kiran Raj Goud Burra, Murat Sahin, Ying Zheng, Ashwani K. Gupta
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Abstract

Abstract With growing need for sustainable carbon neutral liquid fuels, and low-grade feedstocks such as lignocellulosic biomass, and municipal solid wastes offer sufficient potential via thermochemical conversion. But, existing thermochemical means are limited in feed flexibility, and scalability, require significant processing (energy and costs) of the intermediates. Bio-oil/biocrude intermediate from fast-pyrolysis and hydrothermal techniques is impeded with issues of stability and oxygen content, along with hydrotreating viability. To address these issues, we investigated a novel pathway of near-critical CO2-assisted Integrated liquefaction-extraction (NILE) technology in conceptual aspects for conversion of various biomass and municipal solid wastes into high-quality biocrude with high compatibility for co-hydrotreating with traditional fossil crude for liquid fuel needs in power and transportation sectors. Using supercritical CO2 for dewatering wet feedstocks, for liquefaction and extraction for lighter biocrude has produced biocrude with lower oxygen content by 50%, lowered metal content by 90%, stable viscosity, low acidity, and good aging stability compared to that produced from hydrothermal liquefaction along with higher hydrotreating and co-hydrotreating compatibility. Hydrotreating of the biocrude extract from sCO2 extraction also was feasible with no detected coke deposition, oxygen content of 1% and catalyst deactivation. The validation and capabilities of the NILE concept urges for its further development to obtain sustainable liquid fuels with lower GHG emissions and costs.
近临界二氧化碳辅助液化-提取生物质和废物为燃料和增值产品
随着对可持续碳中性液体燃料的需求不断增长,低品位原料如木质纤维素生物质和城市固体废物通过热化学转化提供了足够的潜力。但是,现有的热化学方法在进料灵活性和可扩展性方面受到限制,需要对中间体进行大量处理(能源和成本)。通过快速热解和水热技术获得的生物油/生物原油中间体存在稳定性、氧含量以及加氢处理可行性等问题。为了解决这些问题,我们在概念方面研究了一种近临界二氧化碳辅助综合液化提取(NILE)技术的新途径,该技术将各种生物质和城市固体废物转化为高质量的生物原油,具有高兼容性,可以与传统化石原油共加氢处理,以满足电力和运输部门的液体燃料需求。采用超临界CO2对湿原料进行脱水、液化和提取轻质生物原油,与水热液化相比,生产的生物原油氧含量降低50%,金属含量降低90%,粘度稳定,酸度低,老化稳定性好,加氢处理和共加氢处理的兼容性更高。对sCO2萃取后的生物粗提物进行加氢处理也是可行的,且无焦炭沉积,氧含量为1%,催化剂失活。尼罗河概念的验证和能力促使其进一步发展,以获得具有更低温室气体排放和成本的可持续液体燃料。
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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