二氧化硫脲自热危险性的研究  

Study on self-heating hazard of thiourea dioxide

作　　者：吴保意[1,2] 郭璐[1,2] 张金梅[1,2] 霍明甲[1,2] 王亚琴[1,2] 

机构地区：[1]中国石化青岛安全工程研究院,化学品安全控制国家重点实验室,山东青岛266071 [2]国家安全生产监督管理总局化学品登记中心,山东青岛266071

出　　处：《中国安全生产科学技术》2013年第9期19-23,共5页Journal of Safety Science and Technology

基　　金：国家“十二五”科技支撑课题项目(2012BAK13B02)

摘　　要：为评价二氧化硫脲的自热特性,采用同步热分析仪STA和化学品恒温试验箱对其热分解过程进行了研究。考察了质量为25.0g的样品在温度为100℃、120℃、140℃、160℃、180℃、200℃的自热特性,并考察了质量分别为50g、75g、100g、150g、200g、400g、600g、800g的样品在温度100℃条件下的自热特性。结果表明,二氧化硫脲的分解温度为125.0℃,分解热为601.3J/g,最大放热速率41.8mW/mg;二氧化硫脲的自热过程是一个热分解过程,自热最低起始温度为95℃,峰值温度最小为201.5℃,且与质量呈函数关系;试验发现现有的自热试验标准或测试方法对二氧化硫脲危险性的划分存在一定的缺陷,建议以样品起始自热温度为基准到样品的峰值温差来判定其是否发生自热。The self-heating characteristics of thiourea dioxide were studied by means of synchronization thermal ana- lyzer and chemical temperature chamber. In this article, the self-heating characteristics of 25.0g sample at the tem- perature of 100℃, 120℃, 140℃, 160℃, 180℃ ,200℃ and 50g, 75g, 100g, 150g, 200g, 400g, 600g,800g sample at 100℃ were tested. The testing results showed that the decomposition temperature and enthalpy of which is 125.0℃ and 601.3 J/g respectively. The maximum heat release rate is 41.8mW/mg. Its self-heating is a ther- mal decomposition process. The thiourea dioxide starting with a minimal self-heating temperature of 95℃ and the peak temperature of self-heating is a function of mass with the minimal temperature of 201.5℃. There are some flaws in self-heating standards or test methods of thiourea dioxide in classification of dangerous. It ws suggested to use the difference between initial decomposition temperature and self-heating peak temperature when judging a chemical whether self-heating or not.

关 键 词：二氧化硫脲 自热 热稳定性 分解 

分 类 号：X937[环境科学与工程—安全科学]