The starch used to enhance the paper surface dissolves in water during the production process and forms pollutants that accumulate in water when old corrugated cardboard (OCC) is returned to a paper mill for pulping and reuse. At present, anaerobic fermentation is widely used in the paper industry to treat starch-containing wastewater, producing biogas energy, or oxidative decomposition, which is a huge waste of valuable starch resources. Phosphomolybdic acid (PMo₁₂) is a highly selective catalyst for the oxidation of carbohydrates; therefore, PMo₁₂ can be envisaged as a suitable catalyst to convert waste starch into glycolic acid, an important high added-value chemical. In this paper, the catalytic oxidation technology of PMo₁₂ was explored to produce glycolic acid from starch contained in OCC papermaking wastewater, and the kinetics and influencing factors of the catalytic oxidation reaction were studied. The results indicated that the PMo₁₂-catalyzed oxidation of starch followed a first-order reaction; the reaction rate constant increased with increasing the temperature, the apparent activation energy of starch to monosaccharide was 104.7 kJ mol⁻¹, the apparent activation energies of starch and monosaccharide to humins were 126.5 and 140.5 kJ mol⁻¹, and the apparent activation energy of monosaccharide to glycolic acid was 117.2 kJ mol⁻¹. The yields of monosaccharide and glycolic acid were 80.7 wt% and 12.9 wt%, respectively, and the utilization of starch resources was about 90.0 wt% under the following reaction conditions: temperature, 145 °C; reaction time, 120 min; pH, 2. Therefore, the feasibility of the PMo₁₂-catalyzed oxidation of starch to produce high value-added glycolic acid is demonstrated, which has theoretical guiding significance and potential application value for the clean production and resource utilization of waste starch in the OCC papermaking process.

中文翻译：

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废淀粉在磷钼酸上转化为乙醇酸的实验和动力学研究

用于增强纸张表面的淀粉在生产过程中溶解在水中，并在将旧瓦楞纸板 (OCC) 返回造纸厂进行制浆和再利用时形成污染物，这些污染物会积聚在水中。目前，厌氧发酵在造纸工业中被广泛用于处理含淀粉废水，产生沼气能源，或进行氧化分解，是对宝贵淀粉资源的巨大浪费。磷钼酸（PMo ₁₂）是一种用于碳水化合物氧化的高选择性催化剂；因此，可以设想 PMo ₁₂作为一种合适的催化剂，将废淀粉转化为乙醇酸，乙醇酸是一种重要的高附加值化学品。本文介绍了 PMo _{12的催化氧化技术}探索以OCC造纸废水中的淀粉为原料生产乙醇酸，并研究了催化氧化反应的动力学及影响因素。结果表明，PMo ₁₂催化的淀粉氧化遵循一级反应；反应速率常数随温度升高而增大，淀粉对单糖的表观活化能为104.7 kJ mol ^-1，淀粉和单糖对腐殖质的表观活化能分别为126.5和140.5 kJ mol ^-1，单糖转化为乙醇酸为 117.2 kJ mol ^-1. 在下列反应条件下，单糖和乙醇酸的收率分别为80.7 wt%和12.9 wt%，淀粉资源利用率约为90.0 wt%：温度，145℃；反应时间，120 分钟；pH, 2.由此论证了PMo ₁₂催化淀粉氧化生产高附加值乙醇酸的可行性，对OCC废淀粉的清洁生产和资源化利用具有理论指导意义和潜在应用价值。造纸工艺。