Authors:C. Gonzales, J. Sempere, D. Nomen, and S. Waldram
This paper explains why directly agitated test cells are sometimes required in order to obtain good adiabatic calorimetry data that can be used with confidence to predict large scale plant behaviour. Experiments for methyl methacrylate polymerisation are reported. Simple procedures are presented for calculating genuine thermo-kinetic parameters from data which includes energy dissipation from the stirrer drive system.
A procedure is described for dealing with the error sources inherently present in any real calorimeter: work of powerPs input from stirrer and possibly temperature sensor, and heat exchange at a rate −G(T−Te) whereT andTc are the temperatures of calorimeter and surroundings respectively. The constantsPs andG are calculated from a period of thermal decay, and afterwards are used to correct the entire run. A calorimeter was designed
with high thermal homogeneity and used in a test. The curve of calculated temperature exactly traces the heater energy, even
after 5 h, with a standard deviation of about 1 mK. The relative error inCp is less than 1/1000.
Authors:Werner Hässelbarth, Jürgen Rauch, and Stefan M. Sarge
the adiabatic temperature rise.
The uncertainty of the calorific value of a gas sample measured with the GERG calorimeter is a combination of uncertainties of various different measurements, including those of The adiabatic temperature rise in
Authors:Sridhar Vethathiri Pakkirisamy, Surianarayanan Mahadevan, Sivapirakasam Suthandathan Paramashivan, and Asit Baran Mandal
numerous thermal measurement techniques to characterize the hazardous nature of pyrotechnic mixtures, accelerating rate calorimetry (ARC) is the only adiabatic and versatile calorimetry that produces reliable data. Because ARC measurements are conducted
multi-bed adiabatic reactor with intermediate heat exchangers is selected for such a simulation, while the effects of process conditions are investigated as well.
where α i is the stoichiometric coefficient.
The relationship between
Authors:Sheng-Hung Wu, Meng-Lung Lin, and Chi-Min Shu
energy ( E a ), frequency factor ( A ), maximum temperature ( T max ), temperature rise rate (d T · d t −1 ), time to maximum rate under adiabatic situation (TMR ad ), pressure rise rate (d P · d t −1 ), and maximum pressure ( P max ), etc., were
An adiabatic calorimeter in which automation of the control of the adiabatic condition and the thermogram recording is achieved
in a simple way has been designed for studies of both thermochemistry and thermokinetics. A new method for specific heat measurements
has been proposed and specific heats ofn-heptane were measured to test the reliability of this calorimeter.
Reactions with large negative enthalpy changes are often encountered in the chemical industry. Sometimes they give rise to
technical dangers and hazards, including explosions. This investigation concentrates on examination of adiabatic temperature-time-curves
and gives non-linear optimization procedures for obtaining kinetic parameters of simple decompositions,e.g. o-nitrobezaldehyde, two types of autocatalysis, consecutive reactions and competitive consecutive reactions. The advantage
of this computing method is that only differential kinetic equations are needed.
experimental data of density, speed of sound at the range of temperature (25–40)°C for HMAP, in N,N -dimethylformamide (DMF) system are listed in Table 1 . The apparent molar volumes, V ϕ and apparent molar adiabatic compressibility, K s,ϕ of HMAP, at