In the bio-based economy concept, any biomass should not be used directly for energy purposes without considering the possibility of using it for bioproducts with higher added value. Extractable phytochemicals found in lignocellulosic biomass of perennial industrial crops (PIC) are used in the pharmaceutical, cosmetics, chemical, food and feed industries. Therefore, these compounds should be obtained first, and only the so-called PIC extraction biomass should be used, for example, for the production of bioenergy. An efficient low-energy and environmentally friendly method of extracting phytochemicals from the plant biomass is supercritical carbon dioxide (scCO 2 ) extraction. The aim of the study was to assess the thermophysical properties and chemical composition of 19 types of PIC biomass previously subjected to two types of scCO 2 extraction compared to the biomass before extraction. The biomass after pure scCO 2 and scCO 2 /H 2 O (1 wt%) extraction contained less ash (by 4.9 and 11.3%), carbon (by 3.1 and 7.8%), hydrogen (by 5.8 and 8.9%), nitrogen (by 4.5 and 6.8%), sulfur (by 3.8 and 3.8%), lignin (by 5.4 and 1.1%), hemicellulose (by 14.4%) and more chlorine (by 4.7 and 15.3%) compared to the biomass before extraction. In addition, the biomass after extraction with pure scCO 2 contained more cellulose and was characterized by lower moisture content and higher heating value and lower heating value. However, the biomass after scCO 2 /H 2 O extraction contained more substances soluble in cold and hot water. Generally, the bark of four short-rotation coppice (SRC) species was characterized by a high content of nitrogen, sulfur, substances soluble in cold and hot water, other soluble substances and at the same time low cellulose content (26–28% d.m.). In turn, the wood of all SRC species was characterized by a high cellulose content (51–56% d.m.). However, all herbaceous crops and grasses contained more chlorine, hemicellulose and generally less lignin compared to the SRC biomass. To assess the practical suitability of the PIC biomass extraction for the production of bioenergy (solid, liquid or gaseous biofuels), further research is needed.

中文翻译：

---

用超临界二氧化碳提取生物活性物质如何影响木质纤维素生物质特性？

在基于生物的经济概念中，任何生物质都不应直接用于能源目的，而不考虑将其用于具有更高附加值的生物产品的可能性。在多年生经济作物 (PIC) 的木质纤维素生物质中发现的可提取植物化学物质可用于制药、化妆品、化学、食品和饲料行业。因此，应首先获得这些化合物，并且仅应使用所谓的 PIC 提取生物质，例如，用于生产生物能源。从植物生物质中提取植物化学物质的一种高效、低能耗且环保的方法是超临界二氧化碳 (scCO 2 ) 提取。该研究的目的是评估 19 种类型的 PIC 生物质的热物理特性和化学成分，与提取前的生物质相比，之前进行了两种类型的 scCO 2 提取。纯 scCO 2 和 scCO 2 /H 2 O (1 wt%) 提取后的生物质含有较少的灰分（分别为 4.9% 和 11.3%）、碳（分别为 3.1% 和 7.8%）、氢（分别为 5.8% 和 8.9%）、氮（与提取前的生物质相比，分别增加 4.5% 和 6.8%）、硫（分别增加 3.8% 和 3.8%）、木质素（分别增加 5.4% 和 1.1%）、半纤维素（分别增加 14.4%）和更多的氯（分别增加 4.7% 和 15.3%）。此外，纯scCO 2 提取后的生物质含有较多的纤维素，具有含水量低、热值高、热值低的特点。然而，scCO 2 /H 2 O提取后的生物质含有更多的可溶于冷水和热水的物质。一般来说，四种短轮伐木（SRC）树皮的特点是氮、硫、冷热水中可溶性物质、其他可溶性物质含量高，同时纤维素含量低（26-28% dm ）。反过来，所有 SRC 物种的木材都具有高纤维素含量（51-56% dm）的特点。然而，与 SRC 生物质相比，所有草本作物和牧草都含有更多的氯、半纤维素和更少的木质素。为了评估 PIC 生物质提取在生物能源（固体、液体或气体生物燃料）生产中的实际适用性，需要进一步研究。其他可溶性物质，同时纤维素含量低（26-28% dm）。反过来，所有 SRC 物种的木材都具有高纤维素含量（51-56% dm）的特点。然而，与 SRC 生物质相比，所有草本作物和牧草都含有更多的氯、半纤维素和更少的木质素。为了评估 PIC 生物质提取在生物能源（固体、液体或气体生物燃料）生产中的实际适用性，需要进一步研究。其他可溶性物质，同时纤维素含量低（26-28% dm）。反过来，所有 SRC 物种的木材都具有高纤维素含量（51-56% dm）的特点。然而，与 SRC 生物质相比，所有草本作物和牧草都含有更多的氯、半纤维素和更少的木质素。为了评估 PIC 生物质提取在生物能源（固体、液体或气体生物燃料）生产中的实际适用性，需要进一步研究。