scholarly journals Characterization of reaction enthalpy and kinetics in a microscale flow platform

2020 ◽  
Vol 5 (11) ◽  
pp. 2115-2122
Author(s):  
Agnieszka Ładosz ◽  
Christina Kuhnle ◽  
Klavs F. Jensen
Keyword(s):  
Isothermal Flow ◽  
Reaction Enthalpy ◽  
Flow Calorimeter ◽  
Microscale Flow

We report an isothermal flow calorimeter for characterization of reaction enthalpy and kinetics.

scholarly journals Software-guided microscale flow calorimeter for efficient acquisition of thermokinetic data

2021 ◽  
Author(s):  
Timothy Aljoscha Frede ◽  
Marlene Dietz ◽  
Norbert Kockmann
Keyword(s):  
Design Of Experiments ◽  
Process Development ◽  
Reaction Conditions ◽  
Experimental Conditions ◽  
Flow Calorimeter ◽  
Microscale Flow ◽  
Increased Sensitivity ◽  
Important Time ◽  
Optimal Reaction

AbstractFast chemical process development is inevitably linked to an optimized determination of thermokinetic data of chemical reactions. A miniaturized flow calorimeter enables increased sensitivity when examining small amounts of reactants in a short time compared to traditional batch equipment. Therefore, a methodology to determine optimal reaction conditions for calorimetric measurement experiments was developed and is presented in this contribution. Within the methodology, short-cut calculations are supplemented by computational fluid dynamics (CFD) simulations for a better representation of the hydrodynamics within the microreactor. This approach leads to the effective design of experiments. Unfavourable experimental conditions for kinetics experiments are determined in advance and therefore, need not to be considered during design of experiments. The methodology is tested for an instantaneous acid-base reaction. Good agreement of simulations was obtained with experimental data. Thus, the prediction of the hydrodynamics is enabled and the first steps towards a digital twin of the calorimeter are performed. The flow rates proposed by the methodology are tested for the determination of reaction enthalpy and showed that reasonable experimental settings resulted. Graphical abstract A methodology is suggested to evaluate optimal reaction conditions for efficientacquisition of kinetic data. The experimental design space is limited by thestepwise determination of important time scales based on specified input data.

Preparation and Characterization of Nanoenergetic Materials Based on KNO3-Filled Carbon Nanotubes

2012 ◽  
Vol 557-559 ◽  
pp. 603-606
Author(s):  
Rui Guo ◽  
Yan Hu ◽  
Rui Qi Shen ◽  
Ying Hua Ye
Keyword(s):  
Chemical Method ◽  
Characteristic Temperature ◽  
Exothermic Peak ◽  
Reaction Enthalpy ◽  
Wet Chemical Method ◽  
Nanoenergetic Materials ◽  
Mean Diameter ◽  
Wet Chemical ◽  
Dsc Curves

A novel nanoenergetic material was prepared by filling KNO3in the CNTs through a wet chemical method. The samples were characterized by TEM, XRD, and TG/DSC. The results show that KNO3with a mean diameter of ~9 nm were homogeneously filled into CNTs to form KNO3@CNTs nEMs. The TG/DSC curves indicate that the reaction enthalpy (ΔH) of KNO3@CNTs nEMs was 876.1 J/g and the characteristic temperature of the exothermic peak was 386.8 °C.

An isothermal flow calorimeter for use with corrosive solutions from 50 to 125°C

1995 ◽  
Vol 255 ◽  
pp. 71-81 ◽  
Author(s):  
S.E. Gillespie ◽  
J.L. Oscarson ◽  
R.M. Izatt ◽  
P. Wang
Keyword(s):  
Isothermal Flow ◽  
Flow Calorimeter

scholarly journals Thermal Properties of Lignocellulose Pellets

2017 ◽  
Vol 25 (40) ◽  
pp. 83-90
Author(s):  
Igor Wachter ◽  
Siegfried Hirle ◽  
Karol Balog
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Reaction Enthalpy ◽  
Wood Pellets ◽  
Scanning Calorimetry ◽  
Wood Pellet ◽  
Exothermic Reactions ◽  
Enthalpy Changes ◽  
Dsc Method

Abstract This article deals with the characterization of biomass pellets using Differential Scanning Calorimetry. We used three types of industrially produced and commercially available pellets as samples: wood pellets containing grass, wood pellet containing bark and wood pellets without bark. Each of the samples were examined using the DSC method. Based on the measurements in atmosphere of air and nitrogen temperature, the changes caused by thermal degradation of various kinds of test fuels were observed. Subsequently, limits of exothermic processes, reaction enthalpy changes and the temperature at which exothermic reactions reached peaks were determined.

An isothermal flow calorimeter for high temperature aqueous solutions

1986 ◽  
Vol 99 ◽  
pp. 159-168 ◽  
Author(s):  
J.J. Christensen ◽  
P.R. Brown ◽  
R.M. Izatt
Keyword(s):  
High Temperature ◽  
Aqueous Solutions ◽  
Isothermal Flow ◽  
Flow Calorimeter
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