To investigate the influence of dilute acid pickling on pyrolysis behavior and product distribution during rape straw (RS) pyrolysis, HCl, HF, and HCl + HF were selected. Proximate and ultimate analysis, ICP-AES, SEM, and BET were employed to examine the composition and the physicochemical properties of the biomass. It is found that the alkali and alkaline earth metals (AAEMs) in RS were obviously removed by acid pickling, especially HCl. Fixed bed pyrolysis data showed that liquid product increased from 37.48 wt % (RS) to 42.24 wt % (RS-HCl), 48.03 wt % (RS-HF), and 47.20 wt % (RS-HCl + HF). The relative content of main compounds in bio-oil were identified by GC/MS. Sugars increased from 1.43% (RS) to 25.27% (RS-HCl), 19.00% (RS-HF), and 19.78% (RS-HCl + HF). Particularly, d-allose, which has been widely used in the field of healthcare, increased dramatically. It is proposed that the removal of AAEMs promoted the depolymerization of cellulose or hemicellulose, resulting in increased sugars. Current results provide greater feasibility using bio-oil as raw material in biorefinery process.

中文翻译：

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油菜秸秆固定床反应器热解：稀酸洗对生物油生产和糖分提高的影响

为了研究稀酸酸洗对油菜秸秆（RS）热解过程中热解行为和产物分布的影响，选择了HCl，HF和HCl + HF。采用近似和最终分析，ICP-AES，SEM和BET来检查生物质的组成和理化性质。研究发现，酸洗特别是HCl可以明显去除RS中的碱金属和碱土金属（AAEM）。固定床热解数据显示液体产品从37.48 wt％（RS）增至42.24 wt％（RS-HCl），48.03 wt％（RS-HF）和47.20 wt％（RS-HCl + HF）。通过GC / MS鉴定生物油中主要化合物的相对含量。糖从1.43％（RS）增至25.27％（RS-HCl），19.00％（RS-HF）和19.78％（RS-HCl + HF）。特别是d-在医疗领域中广泛使用的-allose急剧增加。提出AAEM的去除促进了纤维素或半纤维素的解聚，导致糖增加。当前的结果提供了在生物精炼过程中使用生物油作为原料的更大可行性。