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Journal of Thermal Analysis and Calorimetry
Authors: B. Zapata, J. Balmaseda, E. Fregoso-Israel, and E. Torres-García

Abstract  

Thermal degradation of orange peel was studied in dynamic air atmosphere by means of simultaneous TG-DSC and TG-FTIR analysis. According to the obtained thermal profiles, the orange peel degradation occurred in at least three steps associated with its three main components (hemicellulose, cellulose and lignin). The volatiles compounds evolved out at 150–400 °C and the gas products were mainly CO2, CO, and CH4. A mixture of acids, aldehydes or ketones C=O, alkanes C–C, ethers C–O–C and H2O was also detected. The E α on α dependence reveled the existence of different and simultaneous processes suggesting that the combustion reaction is controlled by oxygen accessibility, motivated by the high evolution low-molecular-mass gases and volatile organic compounds. These results could explain the non-autocatalytic character of the reactions during the decomposition process.

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Abstract  

The power-time curves of the growth of three strains of petroleum bacteria at different temperatures have been determined. A novel equation of a power-time curve has been proposed in this paper. The general formula to calculate the rate constant of the bacterial growth has been derived. The rate constants of the bacterial growth at different temperatures, the heat production per newly formed bacterium, the bacterial number at the end of the bacterial growth and the deceleration rate constant of the bacterial growth at 50.00°C, have been calculated. The optimum growth temperatures of the three strains have been obtained.

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Abstract  

The reaction of ilmenite titanium raw materials with sulphuric acid has been studied in a non-isothermal-non-adiabatic type calorimeter. The influence of different starting conditions, temperature and ilmenite particle-size distribution on the thermo-kinetics of the reaction was investigated. A kinetic model is presented for this heterogeneous system for a specified ilmenite particle-size distribution and starting temperature. On the basis of this model and experimentally determined parameters it it possible to analyse by simulation the autothermic reaction of digestion of different titanium ores with sulphuric acid.

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Adiabatic thermokinetics and process safety of pyrotechnic mixtures

Atom bomb, Chinese, and palm leaf crackers

Journal of Thermal Analysis and Calorimetry
Authors: Sridhar Vethathiri Pakkirisamy, Surianarayanan Mahadevan, Sivapirakasam Suthandathan Paramashivan, and Asit Baran Mandal

limited for fireworks mixtures and the recent literature is by the authors on flash composition mixtures [ 7 , 8 ]. In this study, thermal data from ARC and the thermo kinetics of the fireworks mixtures, atom bomb, Chinese crackers, and plam leaf crackers

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. Zapata , B , Balmaseda , J , Fregoso-Israel , E , Torres-Garcia , E . Thermo-kinetics study of orange peel in air . J Therm Anal Cal 2009 98 : 309 – 315 10.1007/s10973-009-0146-9 . 24

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-5813(10)60002-3 . 17. Zapata , B , Balmesada , J , Fragoso-Israel , E , Torres-García , E 2009 Thermo-kinetics study of orange peel in air . J Therm Anal Calorim 98 : 309 – 315 10.1007/s10973

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with heating rate of 10.0 K min −1 and with 20 mg of sample. The Netzsch Thermo kinetics software was used for kinetic analysis of experimental data. Theoretical approach The kinetics of solid single step thermal

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. Zapata , B , Balmaseda , J , Fregoso-Israel , E , Torres-Garcia , E 2009 Thermo-kinetics study of orange peel in air . J Therm Anal Calorim 98 : 309 – 315 10.1007/s10973-009-0146-9 .

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. Zapata , B , Balmaseda , J , Fregoso-Israel , E , Torres-García , E 2009 Thermo-kinetics study of orange peel in air . J Therm Anal Calorim 98 1 309 – 315 10.1007/s10973-009-0146-9 . 3

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. Zapata , B , Balmaseda , J , Fregoso-Israel , E , Torres-García , E . 2009 . Thermo-kinetics study of orange peel in air . J Therm Anal Calorim . 98 : 309 – 315 10.1007/s10973-009-0146-9 . 21

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