Study on the Dangers of Tetramethyl Orthosilicate and Tetraethyl Orthosilicate
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摘要:针对正硅酸乙酯蒸馏提纯过程中出现的燃爆事故，通过DSC实验、隔板实验、克南实验和时间压力实验，开展正硅酸甲酯和正硅酸乙酯的热分解特性和爆炸性研究。结果表明：DSC显示正硅酸甲酯和正硅酸乙酯的初始分解温度分别为212.20℃和208.49℃，分解热分别为88.55J/g和11.98J/g；隔板实验中钢管部分破裂且验证板均未穿孔；克南实验中，当孔径为1mm时，样品在150s内开始发生反应，实验后钢管完好；时间压力实验中，两种样品均未被引燃。综合4种实验的结果，表明两种样品均不属于爆炸性物质。
Abstract:Aiming at the explosion accident in the distillation and purification process of tetraethyl orthosilicate,by means of differential scanning calorimetry,the gap test,the Koenen test and the time pressure test, the detonation performance and thermal stability of tetraethyl orthosilicate and tetramethyl orthosilicate were investigated .The results show that tetramethyl orthosilicate decomposed at 212.20℃ with exothermic heat of 88.55J/g, tetraethyl orthosilicate decomposed at 208.49℃ with exothermic heat of 11.98J/g. In the gap test,the witness plates were not perforated and the tubes were ruptured partially. In the Koenen test,when the hole diameter was 1mm,the samples started to react within 150 seconds and the tubes were still intact after test. In the time pressure test, both samples were not burning.Based on the four test results, the two samples of tetramethyl orthosilicate and tetraethyl orthosilicate are not explosive substances.
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