风化煤中腐殖酸的提取及其性能表征
Humic acid extraction from weathered coal and its properties characterization
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摘要: 以陕西黄陵风化煤为原料,分别采用碱溶酸析、氧解法和催化法提取腐殖酸,确定提取的最佳工艺条件,并通过测定腐殖酸灰分、红外光谱、凝胶色谱和E4/E6值对提取的腐殖酸进行性能表征,考察不同的提取方法对腐殖酸的提取率及结构的影响。结果显示, 3种方法制备的腐殖酸在官能团结构方面没有明显的差异,腐殖酸中含有大量的-COOH和-CO官能团;催化法提取的腐殖酸灰分最多,分子量最大。实验得到最佳提取腐殖酸的实验方法为催化法,最佳提取工艺为催化剂选用NHPI、1∶8的固液比、0.5 mol·L-1NaOH碱液和30 min的沸水浴时间。Abstract: By using Huangling weathered coal from the Shaanxi province as the raw material, humic acid from weathered coal was extracted through alkali soluble acid, oxygen, and catalytic methods and the optimum process for humic acid extraction was determined. The properties of humic acid were characterized through ash analyses, infrared chromatography, gel chromatography, and E4/E6 value determinations. The influence of different extraction methods was assessed in terms of the yield and structure of the humic acid. The results revealed that there were no significant differences in the humic acid functional groups after the raw material was treated with the three extraction methods, and all products contained large numbers of -COOH and -CO functional groups. The ash content was the highest and the molecular weight of humic acid was the largest in the product produced with the catalytic method. The catalytic method was found to be optimal for the extraction of humic acid. During the optimum extraction process, an NHPI catalyst was used and the raw material was treated in a 0.5 mol·L-1 NaOH solution at a 1:8 solid-liquid ratio for 30 min in a boiling water bath.
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Key words:
- weathered coal /
- humic acid /
- extraction /
- characterization
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