ABSTRACT

Montan resin (MR) is a by-product produced during the refinement process of montan wax extracted from lignite and has no usage yet. Chemical modification is an effective method to change the material property for expanding or converting the application area of the material itself. Our previous study found that the high hydrophobicity of MR is the primary limiting factor for its utilization in agriculture. Based on this point, this study attempted to chemically modify MR using the oxidation of peracetic acid, resulting that the MR hydrophilicity was significantly improved, and a water-soluble product (WSP) was obtained. The optimized oxidation conditions of MR, including the reaction temperature (X₁), reaction time (X₂), weight ratio of oxidant and montan resin (X₃), and oxidant concentration (X₄), were determined using single-factor experiments and response surface analysis. The modification degree was evaluated using elemental and oil-water partition coefficient analyses, infrared (IR) spectroscopy, and gas chromatography-mass spectrometry (GC-MS), revealing that the oil-water partition coefficient of the modified product decreased and that the number of chemical constituents with oxygen-containing functional groups clearly increased after modification. Furthermore, the WSP was tested its effects on germination and seedling growth of the wheat seed. Compared with the control group, the WSP showed a promoting effect on the growth and germination of wheat. The WSP concentrations of 600 mg·L⁻¹ and 300 mg·L⁻¹ had the most substantial effect on the root and seedling growth of wheat, respectively.

Implications: Montan resin, a useless by-product produced from crude montan wax, was chemically modified via oxidation of peracetic acid. Its hydrophilicity was significantly improved, and a water-soluble product was obtained after the chemical modification. The optimized oxidation conditions of montan resin were determined using single-factor experiments and response surface analysis. The amount of chemical constituents with oxygen-containing functional groups increased in the modified products after modification, as determined by IR and GC-MS analysis, among other methods. The water-soluble modified product showed an obvious effect in promoting growth and germination of wheat at 600 mg·L-1 and 300 mg·L-1, respectively.

摘要

Montan树脂（MR）是在提炼过程中从褐煤中提取褐煤蜡产生的副产品，目前尚未使用。化学改性是改变材料性质以扩大或转化材料本身的应用领域的有效方法。我们先前的研究发现，MR的高疏水性是其在农业中应用的主要限制因素。基于这一点，本研究试图通过过乙酸的氧化对MR进行化学修饰，从而使MR的亲水性得到显着改善，并获得了水溶性产品（WSP）。MR的最佳氧化条件，包括反应温度（X ₁），反应时间（X ₂），氧化剂与褐煤树脂的重量比（X _3））和氧化剂浓度（X ₄），是通过单因素实验和响应面分析确定的。使用元素和油水分配系数分析，红外（IR）光谱和气相色谱-质谱（GC-MS）对改性程度进行了评估，结果表明改性产品的油水分配系数降低并且数量减少修饰后具有含氧官能团的化学成分的含量明显增加。此外，测试了WSP对小麦种子发芽和幼苗生长的影响。与对照组相比，WSP对小麦的生长和发芽具有促进作用。WSP浓度分别为600 mg·L ^-1和300 mg·L ^-1 分别对小麦的根和幼苗生长有最大的影响。

含义：Montan树脂是由粗制褐煤蜡生产的无用副产品，已通过过氧乙酸的化学改性。其亲水性显着提高，并且在化学改性之后获得水溶性产物。利用单因素实验和响应面分析确定了褐煤树脂的最佳氧化条件。如通过IR和GC-MS分析确定的，除其他方法外，改性后的改性产物中具有含氧官能团的化学成分的量增加。水溶性改性产物分别在600 mg·L-1和300 mg·L-1下对小麦的生长和发芽具有明显的促进作用。