根据亚硫酸钠和铁催化剂的浓度比确定水中除氧的效率

M. Gomelya, A. Holiaka
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引用次数: 0

摘要

腐蚀活动的主要问题是去除水中的氧气。在某些条件下,抑制剂-钝化剂是有效的。其他方法以水的热脱氧和真空脱氧为基础。这些方法既耗费能源,又不能提供所需的水质,因此使用化学试剂对水进行深度脱氧,而不考虑二次污染。 在这项工作中,将含有一定浓度氧气的蒸馏水放入一个密封容器中。向水中加入计算量的亚硫酸钠溶液(焦亚硫酸钠),每隔一段时间后,用氧气计记录水中的氧气浓度,氧气计的传感器之前就放在容器中。在另一系列实验中,向水中加入计算量的亚硫酸钠和硫酸铁溶液,然后迅速关闭容器,每隔一段时间记录一次水中的氧气浓度。 实验表明,在室温下的蒸馏水中,亚硫酸钠与氧气的相互作用非常缓慢。当亚硫酸盐浓度从 50 毫克/分立方米增加到 300 毫克/分立方米时,1 小时内氧气回收率从 27.7% 增加到 56.9%。在亚硫酸盐浓度为 50-300 毫克/分立方米时,当铁浓度为 0.1 毫克/分立方米时,铁(II)离子就已经明显加快了亚硫酸盐还原氧气的速度。根据 0 阶、1 阶、2 阶和 3 阶积分动力学曲线,确定了铁离子存在时蒸馏水中氧气氧化亚硫酸盐的动力学模型。 结果表明,当亚硫酸盐的浓度增加到 200、300 mg/dm3 时,铁的浓度为 0.5-1.0 mg/dm3,氧化过程遵循一阶反应,其速度由氧气浓度决定。当铁和亚硫酸盐的浓度降低时,氧化过程按照二阶和三阶反应进行,此时氧化过程的速度不仅取决于氧气的浓度,还取决于亚硫酸盐(二阶)和铁离子(三阶)的浓度。 这项工作旨在解决冷却系统水制备过程中水脱氧的相关问题。考虑到所获得的令人满意的有效结果和所使用的廉价化学试剂,研究方向是非常有前景的。进一步研究的目标将是找到理想的反应条件,找到最佳的试剂浓度,同时确保过程的最高效率,这反过来将为人类带来解决花费大量资金、化学试剂和环境污染问题的办法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Determination of the efficiency of oxygen removal from water from the ratio of the concentrations of sodium sulfite and the iron catalyst
The main issue of corrosion activity is the removal of oxygen from water. Under certain conditions, inhibitors-passivators are effective. Other methods based on thermal and vacuum deaeration of water. These methods are energy-consuming and do not provide the necessary quality of water, so chemical reagents are used for deep deoxidation of water regardless of secondary pollution. In this work, distilled water with a certain concentration of oxygen was placed in a hermetic container. The calculated amount of sodium sulfite solution (sodium metabisulfite) was added to the water and after certain intervals the oxygen concentration in the water was recorded using an oxygen meter, the sensor of which was placed in the container before. In another series of experiments, calculated amounts of sodium sulfite and iron sulfate solutions were added to the water, the container was quickly closed and the oxygen concentration in the water was recorded at certain intervals. It has been shown that in distilled water at room temperature, sodium sulfite interacts very slowly with oxygen. In 1 hour, the rate of oxygen recovery increases from 27.7 % to 56.9 % when the sulfite concentration increases from 50 to 300 mg/dm3. It was established that iron (II) ions significantly accelerate the rate of oxygen reduction by sulfite already at an iron concentration of 0.1 mg/dm3 at a sulfite concentration of 50-300 mg/dm3. According to the integral kinetic curves of the 0th, 1st, 2nd, and 3rd orders, kinetic models of sulfite oxidation in distilled water with oxygen in the presence of iron ions were determined. It is shown that when the concentration of sulfite increases to 200, 300 mg/dm3, with an iron concentration of 0.5‑1.0 mg/dm3, the oxidation processes follow first-order reactions and their speed is determined by the oxygen concentration. When the concentration of iron and sulfite is reduced, the realization of oxidation processes according to the reactions of the 2nd and 3rd orders was noted, when the speed of the process depends not only on the concentration of oxygen, but also on the concentration of sulfite (2nd order) and iron ions (3rd order) . This work is aimed at solving the relevance of the problem of water deoxidation for water preparation in cooling systems. The direction of the research is very promising considering the satisfactory and effective results obtained and the inexpensive chemical reagents used. Further research will be aimed at finding ideal conditions for the reaction and finding optimal concentrations of reagents while ensuring maximum efficiency of the process, which in turn will bring mankind a solution to the problem of spending large amounts of money, chemical reagents and environmental pollution.
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