Effect of water on the thermal stability of alpha-aluminum hydride

Water can significantly enhance the thermal spontaneous combustion and explosion hazard of alpha-aluminum hydride (α-AlH₃). Thermal analysis suggested that, as the water content increased from 10% to 40%, the total reaction heat was increased by 68.3%. α-AlH₃ with different water contents (10%–40%) underwent hydrolysis reaction and oxidation reaction with the activation energy of 57.9–68.7 kJ/mol and 88.3–107.6 kJ/mol, respectively. As the heating rate increased from 0.2 to 2 °C/min, the onset temperature, the peak temperature, and the maximum heat flow of the exothermic reaction were increased. As the storage temperature increased from 45 to 65 °C, the time to maximum reaction rate decreased from 5.16 to 0.84 h. Combining the results of SEM, XRD, XPS and thermal analysis, the reaction mechanism of α-AlH₃ and water under isothermal and non-isothermal conditions was revealed.     

中国沉淀白炭黑工业中废气、废液资源化利用现状与研究

详细叙述了中国沉淀法白炭黑生产过程中废气、废液产生的来源及危害,指出直接向环境排放二氧化碳废气、硫酸钠废液不仅浪费资源、污染环境,而且严重限制其行业可持续发展。阐述了两种污染物资源化利用的各种方法,其中二氧化碳可以转化成沉淀碳酸钡、轻质碳酸钙等,硫酸钠可以转化成硫酸钡、硫酸钾、硫化钠等工业产品。通过分析、对比资源化利用的各种方法,建议白炭黑生产企业要积极与钡盐行业进行合作联营生产,这样不仅减少“三废”排放,保护环境,而且是污染物资源化利用最佳途径,并且具有一定的可行性。     

中波发射机播出信号失真故障的分析与处理

文中以中波发射机为研究对象,根据设备工作原理,分别从射频电路、信号源、噪音、转换器等方面阐述了故障问题,提出了故障处理的有效措施,结合实际案例掌握了解决中波发射机失真故障的最佳方法。     

AOS生产反应机理描述及相关工艺计算

简述了α-烯基磺酸盐(AOS)的特性,通过对AOS磺化反应机理的分析,就反应过程物料组成及相关控制指标进行了理论计算,提供了一系列理论数据,阐述了AOS生产工艺控制关键点。