Showing papers in "Thermochimica Acta in 1983"

TL;DR: In this article, the effects of pressure and purge gas flow rate (gas phase residence time) on the heat demands of cellulose pyrolysis were investigated using a Setaram DSC in conjunction with stainless steel pressure vessels.

TL;DR: In this paper, an approach, employing the concept of molecular connectivity index of the third degree of graph theory, has been developed to evaluate molar excess enthalpy, HE(T1, x), and molar capacity VE(T 1, x) of any kind of binary mixture (liquid as well as gaseous) of non-electrolytes.

TL;DR: In this article, a three phase research program, using a tubular, laminar flow, micro reactor system, was undertaken to study the effects of pressure on biomass pyrolysis.

TL;DR: In this paper, the relation of kinetic constants calculated by various differential equations was studied using calcium carbonate as a model substance, and a very formal character and the practical equivalency of the various equations used for evaluation of the thermoanalytical curves were found.

TL;DR: In this article, experimental melting enthalpies and entropies of a great number of salt hydrates are reviewed and/or determined by differential scanning calorimetry (DSC).

TL;DR: The heat capacities of NaNO3 and KNO3 were determined from 350 to 800 K by differential scanning calorimetry Solid-solid transitions and melting were observed at 550 and 583 K for Na NO3 and 406 and 612 K for K NO3, respectively as discussed by the authors.

TL;DR: In this paper, a differential scanning calorimeter was used for the measurement of specific heats of clay minerals (sodium and calcium kaolinites, sodium and calcium montmorillonites, illite, and attapulgite) from 300 to 700 K.

TL;DR: The stability constants of M 2+ -EDTA (M 2+ = Ca 2+ or Mg 2+ ) have been determined pH-metrically in aqueous solution as mentioned in this paper.

TL;DR: In this paper, a review of the application of differential scanning calorimetry and thermogravimetry to the study of coals, oil shales and oil sands is presented.

TL;DR: In this article, the α-transformation of pseudoboehmite, boehmite and bayerite containing Cr 3+ and Fe 3+ ions at concentrations of 0, 4.8, 9.1 and 16.7 mole%, which were prepared by coprecipitation, was investigated by means of TG, DTA, X-ray diffraction and diffuse reflectance spectra.

TL;DR: In this paper, a study of the kinetics of the thermal degradation of polyethylene terephthalate (PET) employing differential kinetic models and rapid computer analysis of thermogravimetric weight-loss data is presented.

TL;DR: Determination experimentale a partir du diagramme de phase and des chaleurs de fusion des energie libre, entropie et enthalpie d'exces de cet eutectique.

TL;DR: In this paper, the authors measured the excess enthalpy of mixing of DMF-water at 25° C in the 0-1 molar fraction range and developed the maximum of heat for a 0.33 molar mixture.

TL;DR: In this paper, the decomposition mechanism of natural and artificial hydrargillites was investigated by means of quasi-isothermal-quasi-isobaric thermogravimetry and X-ray examination.

TL;DR: In this article, the experimental TG and DTG curves were used for examination of the thermodynamics and kinetics of amine hydrochlorides, and the values evaluated for the enthalpy of vaporization enable the estimation of some parameters characterizing this group of compounds, namely, the enthpy of formation and the energy of the crystal lattice of the salts, as well as the formation of the C n H 2 n + 1 NH + 3 ions.

TL;DR: In this article, a model was devised to analyse excess property data for binary liquid mixtures, which embodied the concept of the segmentation of the total composition range into three distinct regions.

TL;DR: In this article, a systematic investigation of the oxidation of metal sulphides and sulphide concentrates by various methods, including chemical, mineralogical and sieve analysis, together with combined DTA, DTG and gas phase analysis, was conducted.

TL;DR: In this paper, the thermal decomposition of some platinum(II) and platinum(IV) complexes was studied using thermogravimetric and differential thermal analysis (TG and DTA) techniques.

TL;DR: In this paper, flow calorimetric techniques were used to determine excess enthalpies and volumetric heat capacities of 2,5,8-trioxanonane + n -heptane mixtures at 25°C.

TL;DR: In this article, a probable explanation is presented on the basis of the trend of Δ T /ν mK vs mK, which is a measure of liquid-solid equilibrium temperatures in binary mixtures of acetamide and inorganic salts.

TL;DR: In this article, an approximate correction for the smearing in a differential heat flux calorimeter is presented. But the correction is based on a simple equivalent circuit diagram, which eliminates the greatest part of the distortion.

TL;DR: In this paper, the uncertainty of the calibration factor for heat-flux-calorimeters due to variation of sample parameters is estimated to be 1 to 5 percent depending on temperature and on the properties of the calorimeter in question.

TL;DR: In this article, the authors used heat flow calorimetry to study the thermal behavior of different milk powders above 20°C. Exothermic reactions of different types occurred when measurements were made with the samples in sealed cells.

TL;DR: Differential thermal analysis was used to investigate the spontaneous combustion of cotton cellulose in an atmosphere of flowing air, and the temperature at which the onset of spontaneous ignition occurs, Ti, was determined as a function of sample mass, air flow rate and heating rate as mentioned in this paper.

TL;DR: In this article, the enthalpy of formation of ω-amino-acids in the gaseous state with the values calculated using Benson's scheme was compared.

TL;DR: In this paper, the desorption process of water from zeolites is presented as a first-order reaction, and both isothermal and non-isothermal kinetic analyses are carried out.

TL;DR: The role of Na2O-and Li2Odoping on the thermal decomposition of Co3O4 to CoO and the re-oxidation of cobaltous to cobaltic oxide has been investigated using DTA, with controlled rates of heating and cooling, IR and X-ray diffraction spectrometry techniques.

TL;DR: In this paper, the effects of sample mass and particle size on the determination of kinetic parameters with the calculation procedures of Ozawa and Kissinger in differential scanning calorimetry were studied with factorial designs.