Kinetics of nitrous acid formation in a two-phase tri-n-butylphosphate-diluent/aqueous nitric acid extraction system under the effect of power ultrasound
Kinetics of nitrous acid formation in a two-phase tri-n-butylphosphate-diluent/aqueous nitric acid extraction system under the effect of power ultrasound
复制标题
功率超声作用下磷酸三正丁酯-稀释剂/硝酸水两相萃取体系中亚硝酸形成的动力学
DOI：
10.1016/s1350-4177(99)00038-3
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发表时间：
2000
影响因子：
8.4
通讯作者：
Madic
中科院分区：
文献类型：
--
作者：
Nikitenko;Moisy;Venault;Madic
在Ar气氛下，研究了磷酸三丁酯（TBP）-稀释剂/HNO 3（1.5-6.0moll-1）两相体系（稀释剂为n-C_（16）H_（34），n-C_（12）H_（26），n-C_（9 H）_（20）和i-C_（8H）_（18））在频率为20 kHz的功率超声作用下生成亚硝酸的动力学。HNO 2声化学生成速率随稀释剂蒸汽压的升高而降低。生成的HNO 2由于被TBP萃取而分布在水相和有机相之间。HNO 2声化学生成动力学在两相系统中表现出诱导期由于NOx（NO+NO2）气体反应在HNO 3介质。该诱导期随HNO 3浓度和超声强度的增加而减小。在长时间超声作用下，HNO 2的稳态浓度作为HNO 2声化学分解的结果。在超声处理下，HNO 2在水相中比在有机相中分解得更快。
The kinetics of nitrous acid formation were investigated in two-phase tri-n-butylphosphate (TBP)–diluent/HNO3(1.5–6.0moll−1) systems, where diluent is n-C16H34, n-C12H26, n-C9H20and i-C8H18, under the effect of power ultrasound at 20kHz frequency under Ar atmosphere. The rate of HNO2sonochemical formation decreases with the rise in diluent vapor pressure. The HNO2formed is distributed between the aqueous and organic phases due to its extraction with TBP. The kinetics of HNO2sonochemical formation in the two-phase system exhibits induction periods due to NOx(NO+NO2) gas reactions in the HNO3medium. This induction period decreases with increasing HNO3concentration and ultrasound intensity. The HNO2steady-state concentration was obtained under long-time sonication as the result of HNO2sonochemical decomposition. HNO2decomposes faster under sonication in the aqueous phase than in the organic phase.