Precise Urea/Water Eutectic Composition by Temperature-Resolved Second Harmonic Generation

被引：11
|
作者：
Yuan, Lina [1 ]
Clevers, Simon [1 ]
Couvrat, Nicolas [1 ]
Cartigny, Yohann [1 ]
Dupray, Valerie [1 ]
Coquerel, Gerard [1 ]
机构：
[1] Univ Rouen, Normandie Univ, Lab SMS EA3233, F-76821 Mont St Aignan, France
来源：
CHEMICAL ENGINEERING & TECHNOLOGY | 2016年 / 39卷 / 07期
关键词：
Eutectic composition; Hypereutectic; Hypoeutectic; Second harmonic generation; Urea; BIURET-WATER SYSTEM; PHASE-DIAGRAM; BINARY-SYSTEM; UREA; CRYSTALLIZATION; EQUILIBRIA; TRANSITION; SCR;
D O I：
10.1002/ceat.201600032
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The use of temperature-resolved second harmonic generation (TR-SHG) to determine the accurate eutectic composition between urea and water is illustrated. The TR-SHG results were confirmed with differential scanning calorimetry and thermal stage microscopy observations. Due to the sensitivity of this technique, by precisely differentiating the liquidus temperature and the eutectic temperature, the eutectic composition was determined to be between 32.8 and 32.9 wt %, compared to 32.5 wt% for the commercial aqueous urea solution marketed for NOx concentration reduction. This study demonstrates that TR-SHG is a promising tool for precisely determining the eutectic compositions of binary systems involving at least one non-centrosymmetric phase.
引用
收藏
页码：1326 / 1332
页数：7
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