Liquids obtained by fractional condensation of pyrolysis vapors from two types of lignocellulosic biomass, namely Jerusalem artichoke stalk (high cellulose and ash contents) and white birch bark (high lignin and extractive contents), were compared. Using two condensers connected in series, a dark oily fraction rich in phenolic compounds and sugar derivatives was obtained at 90 °C (respectively, 14% of total polyphenols and 11% of total carbohydrates for the oily fraction from the agricultural stalk) followed by aqueous fraction at 0 °C. Stalk yielded a homogeneous oily fraction whereas the bark oily liquid was heterogeneous, due possibly to lignin pyrolysis products. Both yielded clear orange aqueous fractions having a chemical composition close to wood vinegar, > 60% water, and high concentrations of acetic acid, with also a significant content of polyphenols, around 5%. This study showed that fractional condensation could be a vital tool in pyrolysis-based biorefinery producing an oily (application as an energy source or as a chemical feedstock) and an aqueous fraction (applications as biocide or biostimulation in agriculture) by pyrolysis of vastly different lignocellulosic biomasses.

比较了从两种类型的木质纤维素生物质（即菊芋茎（纤维素和灰分含量高）和白桦树皮（木质素和提取物含量高））中通过热解蒸气的分馏冷凝获得的液体。使用两个串联的冷凝器，在90°C时得到富含酚类化合物和糖衍生物的深色油状馏分（分别来自农业秸秆的油状馏分，分别占总多酚总量的14％和总碳水化合物的11％），然后加水在0°C时的馏分。茎产生均匀的油状馏分，而树皮油状液体则是异质的，这可能是由于木质素热解产物所致。两者均产生清澈的橙色水性馏分，其化学成分接近木醋，> 60％的水和高浓度的乙酸，还含有大量的多酚，约为5％。这项研究表明，分馏冷凝可能是基于热解的生物精炼厂的重要工具，通过热解截然不同的木质纤维素来生产油状（作为能源或化学原料的应用）和水相（作为杀生物剂或生物刺激性的应用）。生物量。