Search Results

You are looking at 11 - 20 of 45 items for :

  • "self-heating" x
  • Refine by Access: All Content x
Clear All

Fauske & Associates, LLC [ 22 ]. The test data of a sample such as self-heating rate; control reaction of temperature, pressure, and time and reaching maximum heating temperature and pressure; and other related data were obtained by VSP2. In addition, the

Restricted access

temperature ( T 0 ), time to maximum rate ( TMR ), maximum temperature ( T max ), maximum pressure ( P max ), Δ H d , activation energy ( E a ), maximum self-heating rate ((d T d t −1 ) max ), and maximum pressure rise rate ((d P d t −1 ) max ) can be

Restricted access

. VSP2 tests VSP2, which is a PC-governed adiabatic calorimeter system manufactured by Fauske and Associates, LLC (FAI) [ 17 ], was used to acquire thermokinetic and thermal hazard data, such as self-heating rate ((d T d t −1 ) max ), and

Restricted access

Abstract  

In November 2003 an explosion occurred at a shopping center in a room where organic waste including raw garbage is treated. Eleven people were injured including firefighters on duty and the explosion destroyed the walls of the room. To obtain a better understanding of self-heating and gas evolution processes thermal analysis, gas products analysis, spontaneous ignition test and bacterial analysis were carried out. Based on the experimental results accident scenario was investigated and it was considered that the flammable gases generated during a self-heating and combustion in a fermentation tank caused the gas explosion.

Restricted access

Abstract  

Composting technologies rely on standard methods for quality determination. The maturity of a compost is assayed by self-heating experiments in Dewar-vessels. The resulting maximum temperature is classified on a five-level scale. This study demonstrated systematic errors that might occur when assays are performed in Dewars of different size. The vessels were characterized as heat conduction calorimeters and the processes of biochemical decomposition and heat generation and autothermic effects (temperature) were evaluated quantitatively.

Restricted access

Abstract  

Contrary to the situation in the field of temperature, heat and heat flow rate calibration, so far no generally accepted and easily practicable chemical reaction exists with regard to a kinetic evaluation. A possible reaction would be the well-known first-order cis-trans isomerization of subcooled liquid azobenzene. Surprisingly, the evaluation of measurements performed with a power compensated calorimeter yields activation parameters, which are dependent on the heating rate. The desmearing of the curves does not produce any improvements. However, constant activation parameters are obtained, if a small self-heating of the sample during the exothermic reaction is taken into account.

Restricted access

The most decisive phenomena arising either from specific DTA measurements (heat inertia, temperature deviation, self-heating) or from non-isothermal kinetic treatment (overlapping models, characteristics determinations) are discussed.

Restricted access

Summary The influence of the atmospheric conditions such as the oxygen concentration and its pressure on the spontaneous ignition behaviour of activated carbon was investigated with high pressure DSC (HP-DSC), TG-DTA and SIT (spontaneous ignition test). The onset temperature with HP-DSC lowered with the increase of the oxygen concentration and the onset temperature could be predicted with the oxygen concentration. From the adiabatic self-heating profiles observed by SIT the onset temperature lowered with the increase of the oxygen concentration and the activation energy of induction period of exothermic reaction was determined as 28~39 kJ mol-1.

Restricted access

Abstract  

Organic peroxides (OPs) have caused many momentous explosions and runaway reactions, resulting from thermal instability, chemical pollutants, and even mechanical shock. In Taiwan, dicumyl peroxide (DCPO), due to its unstable reactive nature, has caused two thermal explosions and runaway reaction incidents in the manufacturing process. To evaluate thermal hazards of DCPO in a batch reactor, we studied thermokinetic parameters, such as heat of decomposition (†H d), exothermic onset temperature (T 0), maximum temperature rise ((dT/dt)max), maximum pressure rise ((dP/dt)max), self-heating rate (dT/dt), etc., via differential scanning calorimetry (DSC) and vent sizing package 2 (VSP2).

Restricted access

Abstract  

Over 90% of the cumene hydroperoxide (CHP) produced in the world is applied in the production of phenol and acetone. The additional applications were used as a catalyst, a curing agent, and as an initiator for polymerization. Many previous studies from open literature have verified and employed various aspects of the thermal decomposition and thermokinetics of CHP reactions. An isothermal microcalorimeter (thermal activity monitor III, TAM III), and a thermal dynamic calorimetry (differential scanning calorimetry, DSC) were used to resolve the exothermic behaviors, such as exothermic onset temperature (T 0), heat power, heat of decomposition (ΔH d), self-heating rate, peak temperature of reaction system, time to maximum rate (TMR), etc. Furthermore, Fourier transform infrared (FT-IR) spectrometry was used to analyze the CHP products with its derivatives at 150 °C. This study will assess and validate the thermal hazards of CHP and incompatible reactions of CHP mixed with its derivatives, such as acetonphenone (AP), and dimethylphenyl carbinol (DMPC), that are essential to process safety design.

Restricted access