Production and characterization of hydrochar produced from hydrothermal liquefaction of pipeline-transported softwood biomass
Bibliographic record
Abstract
This study investigates hydrochar production from hydrothermal liquefaction (HTL) of pipeline-transported softwood biomass. Pipelining biomass using water as a carrier fluid offers a cost-effective alternative to truck transport, and its integration with HTL for hydrochar production is relatively unexplored. The objective of this study was to evaluate the effect of process parameters on HTL of pipelined biomass and characterize the resulting hydrochar for various applications. The yield of hydrochar produced from pipelined biomass, at the optimal process conditions, was 13.22 % (oven-dry mass basis), with 19.31 % of energy recovered in hydrochar. The hydrochar was characterized as a black, fragile, mildly acidic carbon material with a dry bulk density of 0.142 g/cm 3 , improved carbon content, increased surface area (9.27 m 2 /g), altered pore morphology, and a graphitized, amorphous structure, reflecting structural and compositional changes from the HTL process. Pipelining was found to have minimal impact on the lignocellulosic composition and particle size of the softwood biomass, but it resulted in the leaching of inorganic elements, leading to a reduction in ash content in the hydrochar. The characterization results suggest the hydrochar is suitable for soil amendment and solid fuel applications; its low surface area hinders its use as an adsorbent or for energy storage. This study thus demonstrates the potential of integrating hydro-transportation with HTL, offering a pathway to recover, manage, and use hydrochar for various applications. • The study characterized hydrochar from HTL of biomass transported via pipeline. • Hydrochar yield was 13.22 % with 19.31 % energy recovery under optimal HTL processing. • Hydrochar was black, fragile, and mildly acidic with 0.142 g/cm 3 dry bulk density. • Hydrochar had 72.4 % C, 9.27 m 2 /g surface area, and graphitized-amorphous structure. • Hydrochar obtained is suitable for soil amendment and solid fuel applications.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".