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[目的]获得从腐熟糠醛渣中利用碱提酸析方法制备生化腐植酸的最优工艺。[方法]以发酵糠醛渣为原料,采用碱提酸析法提取生化腐植酸(BHAs)。通过四因素四水平的正交实验,考察固液比(发酵糠醛渣与水的质量比)、碱液浓度、提取温度、提取时间对生化腐植酸提取率的影响,再利用盐酸调节提取液的p H值,使生化腐植酸沉淀析出,固液分离烘干后得到成品生化腐植酸。[结果]最佳的腐植酸提取工艺条件为:碱提步骤固液比为1:8、碱液浓度为8%、提取时间为2.5 h、提取温度为70℃,酸析步骤p H为2.5。得到腐植酸含量为76%的固体生化腐植酸成品,其提取率为49%。[结论]该研究为碱提酸析法从发酵糠醛渣中分离提纯BHA提供了理论依据。
[Objective] The research aimed to obtain the optimum process for the preparation of biochemical humic acid from the matured furfural residue by acid extraction method. [Method] Fermentation furfural residue was used as raw material to extract biochemical humic acid (BHAs) by alkaline extraction. The effect of solid-to-liquid ratio (mass ratio of furfural residue to water), lye concentration, extraction temperature and extraction time on the extraction rate of biochemical humic acid was investigated by four-factor and four-level orthogonal experiment. p H value, so that biochemical humic acid precipitation, solid-liquid separation and drying finished biochemical humic acid. [Result] The optimum extraction conditions of humic acid were as follows: the ratio of solid to liquid was 1: 8, the concentration of lye was 8%, the extraction time was 2.5 h, the extraction temperature was 70 ℃, the pH of acid precipitation step was 2.5 . Obtained humic acid content of 76% of solid biochemical humic acid finished product, the extraction rate was 49%. [Conclusion] This study provided a theoretical basis for the separation and purification of BHA from fermented furfural residue by alkaline extraction.