“干浓硫酸”的制备与性质研究

Preparation and property of “dry concentrated sulfuric acid”

用十三氟辛基三甲氧基硅烷对SiO_2纳米球(SN)表面进行功能化修饰,制得了耐腐蚀的超疏水SiO_2纳米球(SNF)。将SN-F与90%浓硫酸在高速搅拌下混合,成功地制备了"干浓硫酸",即空气包浓硫酸反相气泡。探讨了SN-F用量对形成"干浓硫酸"的影响,当SN-F的用量为浓硫酸质量的5%时,"干浓硫酸"为粒径100~200μm间均匀的球体。通过此方法制得的"干浓硫酸"形貌均匀、比表面积大,具有一定的机械强度,且其形貌及性质在18个月后没有改变,为浓硫酸的安全运输、储存、化学反应等应用提供了新的机会。

Functional modification of surface of＇ SiO2 nanoparticles （ SN ） with 1 H, 1 H, 2H, 2H - perfluoro- octanetrimethoxysilane was conducted, and corrosion resisting super hydrophobic SiO2 nanopartieles （ SiN - F） were prepared. Then ＂dry concentrated sulfuric acid＂, which is sulfuric acid encapsulated in air inverse phase bubbles was prepared by mixing SN - F and 90% concentrated sulfuric acid under high speed stirring. The effect of the dosage of SN - F on formation of ＂dry concentrated sulfuric acid＂ was examined. Result shows that when the dosage of SN - F is 5% of the mass of concentrated sulfuric acid ,morphology of the ＂dry concentrated sulfuric acid＂ is uniform spherical with particle size of 100 -200 μm. The prepared ＂dry concentrated sulfuric acid＂ displays high specific surface area and certain properties remain chemical reaction unchanged. The method provides mechanical strength. After 18 months, its morphology and new opportunities for safety in transportation, storage and operations in industrial applications of concentrated sulfuric acid.