Liquefaction of lignocellulosic biomass through fast pyrolysis, to yield fast pyrolysis bio-oil (FPBO), is a technique that has been extensively researched in the quest for finding alternatives to fossil feedstocks to produce fuels, chemicals, etc. Properties such as high oxygen content, acidity, and poor storage stability greatly limit the direct use of this bio-oil. Furthermore, high coking tendencies make upgrading of the FPBO by hydrodeoxygenation in fixed-bed bed hydrotreaters challenging due to plugging and catalyst deactivation. This study investigates a novel two-step hydroprocessing concept; a continuous slurry-based process using a dispersed NiMo-catalyst, followed by a fixed bed process using a supported NiMo-catalyst. The oil product from the slurry-process, having a reduced oxygen content (15 wt%) compared to the FPBO and a comparatively low coking tendency (TGA residue of 1.4 wt%), was successfully processed in the downstream fixed bed process for 58 h without any noticeable decrease in catalyst activity, or increase in pressure drop. The overall process resulted in a 29 wt% yield of deoxygenated oil product (0.5 wt% oxygen) from FPBO with an overall carbon recovery of 68%.

中文翻译：

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使用浆料床和固定床加氢处理将快速热解生物油升级为可再生碳氢化合物

通过快速热解液化木质纤维素生物质以产生快速热解生物油 (FPBO)，是一种已被广泛研究的技术，旨在寻找化石原料的替代品来生产燃料、化学品等。诸如高氧含量等特性、酸性和较差的储存稳定性极大地限制了这种生物油的直接使用。此外，由于堵塞和催化剂失活，高结焦倾向使得通过固定床加氢处理装置中的加氢脱氧升级 FPBO 具有挑战性。本研究研究了一种新颖的两步加氢处理概念；使用分散 NiMo 催化剂的连续浆料工艺，然后使用负载型 NiMo 催化剂的固定床工艺。与 FPBO 相比，浆液工艺的油产品具有较低的氧含量 (15 wt%) 和相对较低的焦化倾向（TGA 残留物为 1.4 wt%），在下游固定床工艺中成功加工了 58 小时催化剂活性没有任何明显下降，或压降增加。整个过程使 FPBO 脱氧油产品的产率为 29 wt%（0.5 wt% 氧气），总碳回收率为 68%。