Thermolysis of 1,3-dioxin-4-ones: fast generation of kinetic data using in-line analysis under flow

Thermolysis of 1,3-dioxin-4-ones: fast generation of kinetic data using in-line analysis under flow
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1,3-二恶英-4-酮的热解:使用流动下在线分析快速生成动力学数据

DOI:
10.1039/c5re00007f
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发表时间:
2016
影响因子:
3.9
通讯作者:
Durand T
Durand T
中科院分区:
化学2区
文献类型:
--
作者:
Durand T

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快速采集动力学数据证明了与商业中尺度流动反应器,使用流量的阶跃变化或“推出”从流线。对于1,3-二恶英-4-酮(1)的热分解,我们从两种流速(±3 kJ mol−1,0.7 kcal mol−1)之间的过渡期间通过在线UV或透射FT-IR监测输出收集的光谱数据中获得了测量的活化能的良好再现性。多组分UV和IR数据的分析使用正交投影方法(通过交替最小二乘法进行多变量曲线解析)进行复杂光谱,或通过非重叠峰吸光度的无校准积分进行。所有的分析方法进行了验证,使用离线1H NMR分析,和动力学参数使用的方法的流速阶跃变化进行了验证,对传统的稳态测量,其中的时间序列数据,在多个实验中获得。热传递和分散效果的解决。本文所述的实验方法对于加速反应研究和工艺开发是有价值的。
Rapid acquisition of kinetic data is demonstrated with a commercial meso-scale flow reactor, using a step-change in flow rate or ‘push-out’ from the flow line. For thermolysis of 1,3-dioxin-4-ones (1), we obtain excellent reproducibility in the activation energies measured from spectroscopic data collected by in-line UV or transmission FT-IR monitoring of the output during the transitional period between two flow rates (±3 kJ mol−1, 0.7 kcal mol−1). Analysis of multi-component UV and IR data is conducted using an orthogonal projection approach (multivariate curve resolution by alternating least squares) for complex spectra, or by calibration-less integration of non-overlapping peak absorbance. All analysis methods were validated using off-line 1H NMR analysis, and kinetic parameters obtained using the method of a flow rate step-change were validated against conventional steady-state measurements in which time-series data were acquired across multiple experiments. Thermal transfer and dispersion effects are addressed. The experimental methods described herein are valuable for accelerated reaction study and in process development.
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