Effect of humidity on moisture absorption of sodium percarbonate and its thermal hazard

IF 3.6 3区工程技术 Q2 ENGINEERING, CHEMICAL

Journal of Loss Prevention in The Process Industries Pub Date : 2024-08-20 DOI:10.1016/j.jlp.2024.105409

Yosuke Nishiwaki

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Abstract

Sodium percarbonate (SPC), also known as sodium carbonate–hydrogen peroxide, is a bleaching. The thermal decomposition of SPC produces oxygen, which slightly increases its bleaching ability. Nevertheless, the heat and oxygen produced pose a fire risk, potentially leading to spontaneous combustion when the SPC is stored alongside flammable materials. Previous studies have noted that water vapour affects SPC decomposition; However, the moisture absorption of SPC and the particular details of the effect have not been reported. In this study, the moisture absorption test revealed the deliquescence of SPC above 75% relative humidity (RH) and its hygroscopicity above 60% RH. Deliquescence occurred at 30 °C and 84% RH for 192 h, and the absorbed water caused its decomposition. Adiabatic calorimetry revealed only 30 wt% water, which was similar to that absorbed by SPC stored for 24 h at 30 °C and 97% RH, decreasing the thermal stability of SPC. These results indicate that the humidity surrounding the SPC is an extremely important parameter for estimating thermal hazards during the storage and manufacturing of SPC.

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湿度对过碳酸钠吸湿性的影响及其热危害

过碳酸钠（SPC）又称碳酸钠-过氧化氢，是一种漂白剂。过碳酸钠在热分解过程中会产生氧气，从而略微增强其漂白能力。然而，产生的热量和氧气会带来火灾风险，当 SPC 与易燃材料一起存放时，可能会导致自燃。以前的研究曾指出，水蒸气会影响 SPC 的分解；但 SPC 的吸湿性及其影响的具体细节尚未见报道。在这项研究中，吸湿测试显示 SPC 在相对湿度（RH）超过 75% 时会潮解，在相对湿度超过 60% 时会吸湿。潮解发生在 30 °C 和 84% 相对湿度条件下，持续时间为 192 小时，吸收的水分导致其分解。绝热热量测定法显示只有 30 wt% 的水分，这与在 30 °C 和 97% 相对湿度条件下存放 24 小时的 SPC 所吸收的水分相似，从而降低了 SPC 的热稳定性。这些结果表明，SPC 周围的湿度是估计 SPC 储存和制造过程中热危害的一个极其重要的参数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Loss Prevention in The Process Industries 工程技术-工程：化工

CiteScore

7.20

自引率

14.30%

发文量

226

审稿时长

52 days

期刊介绍： The broad scope of the journal is process safety. Process safety is defined as the prevention and mitigation of process-related injuries and damage arising from process incidents involving fire, explosion and toxic release. Such undesired events occur in the process industries during the use, storage, manufacture, handling, and transportation of highly hazardous chemicals.