Research On Hexamethyl Phosphoric Triamide Thermal Risk Of Assessment

In the chemical production process, if the heat exchange with the reactor or the reaction fails condenser operating temperature is not controllable, even better thermal stability of the product in a batch or semi-batch reactor will accumulate heat, which has may trigger a secondary reaction, the material in the reactor in a short time generate a lot of heat. If the heat can not be swapped out through the media, ranging from the reaction container is damaged, it caused heavy casualties. Thus, by what means, with what kind of instrument can accurately describe the nature of the chemical reaction, the reaction process judge whether the material can cause secondary reactions; how to assess the condenser temperature disturbances lapse or secondary reactions to heat exposure and the division of the size of the risk threshold, and based on an assessment placement in appropriate safety equipment or safety measures; thermal risk assessment methods evaluate the size of the risk evaluation method between Dow Chemical and differences between what has become a very worthwhile study.In this paper, hexamethylphosphoric triamide technology compared to the difference between the calorimeter, DSC differential scanning calorimetry select analyzed the process product and reactant derived heat release rate of q, the reaction wave peak, unit mass of the reaction enthalpy Hr, through the peak analysis, research process whether there will be secondary reactions. And based on the theory of thermodynamics, select the group contribution method, van’s hoff extrapolation of the rate of heat for some of the physical parameters used to fit calculated the heat used in the risk assessment derived activation energy E, specific heat capacity CP. Define the possibility of thermal risk and severity of failure time representation made with the greatest likelihood of heat exposure, heat exposure adiabatic heating value expressed in severity, and gives division of risk areas. For further study of thermal risk assessment methods, selecting Dow Chemical Evaluation Board through the ordinal value of the risk matrix and thermal risk assessment method comparison study of two evaluation methods and differences between.Heat through the risk assessment process that selected research process has certain risks, need to install some safety equipment, to take certain safety measures. Dow Chemical given by comparing the evaluation results, two evaluation methods are clear that this process has a certain degree of risk, this paper described the risk assessment method used by a certain application value. Meanwhile, the papers on the thermal stability from the material of the risk assessment process, further reveal the thermal stability and chemical substances secondary reactions triggered by the impact on the safe operation, draw maximum response time to failure and material factor MF between relevant, Dow Chemical evaluation methods fail due to the thermal reaction initiators secondary reaction risk assessment also applies.The study also showed that the material factor MF and maximum response time to failure TMRad although calculation methods, different definitions, but through the evaluation phase consistency between the two factors; material factor MF values are essentially the value of material response characterization, which involves participation of chemical substances reaction activity; maximum response time is the time value reflects the failure of thermal explosion formed by comparing the two methods, between these two factors relevant consistency.