Company Profile
Thermal Stability Analysis
Analytical Significance
Thermal stability analysis of materials refers to conducting thermal stability tests on the materials to be evaluated to obtain the technical data required for thermal stability evaluation. Based on the data of material thermal stability analysis, the potential explosion hazard of the material is evaluated, the dangerous situation caused by decomposition is analyzed, and requirements are put forward to avoid heating or over-temperature of the material during use, which may cause dangerous accidents.
Analysis Criteria
In January 2017, the "Guiding Opinions of the State Administration of Work Safety on Strengthening the Safety Risk Assessment of Fine Chemical Reactions" [Work Safety Supervision General Manager III [2017] No. 1] (Guidelines for Safety Risk Assessment of Fine Chemical Reactions) was carried out in accordance with the above guidelines (GBXXX-Fine Chemical Reaction Safety Risk Assessment Specifications)
GB 51283 Fire protection standard for engineering design of fine chemical enterprises
GB/T 22232 Determination of thermal stability of chemical substances by differential scanning calorimetry
GB/T 17802 Thermal analysis test method for kinetic constants of thermally unstable substances
SN/T 3078.1 Guide for evaluation of thermal stability of chemicals - Accelerated calorimeter method
NY/T 3784 Pesticide Thermal Stability Testing Method-Adiabatic Calorimetry
GB 51283 Fire protection standard for engineering design of fine chemical enterprises
GB/T 22232 Determination of thermal stability of chemical substances by differential scanning calorimetry
GB/T 17802 Thermal analysis test method for kinetic constants of thermally unstable substances
SN/T 3078.1 Guide for evaluation of thermal stability of chemicals - Accelerated calorimeter method
NY/T 3784 Pesticide Thermal Stability Testing Method-Adiabatic Calorimetry
Analytical Parameters
(1) Generate hot
(2) Reaction heat
(3) Adiabatic initial heat release temperature
(4) Adiabatic temperature rise
(5)Reaction rate
(6) Apparent reaction activation energy
(7) Adiabatic maximum temperature rise rate time
(8)Irreversible temperature
(9) Self-accelerating decomposition temperature
(2) Reaction heat
(3) Adiabatic initial heat release temperature
(4) Adiabatic temperature rise
(5)Reaction rate
(6) Apparent reaction activation energy
(7) Adiabatic maximum temperature rise rate time
(8)Irreversible temperature
(9) Self-accelerating decomposition temperature
Analysing content
(1) Maximum reaction rate arrival time under adiabatic conditions (TMRad)
Under adiabatic conditions, the time required for an exothermic reaction to start and reach the maximum reaction rate is the explosion time. Using the arrival time of the maximum reaction rate, you can estimate the possibility of a runaway reaction triggering a secondary decomposition reaction. The longer the time, the lower the possibility of a runaway reaction;
(2) Adiabatic temperature rise (ΔTad)
In an exothermic reaction under adiabatic conditions, all the heat released by the system when the reactants are completely converted leads to an increase in the temperature of the material. It is proportional to the heat release of the reaction. The greater the heat release of the reaction, the higher the adiabatic temperature rise, and the more serious the consequences. It is used to evaluate the possible severity of the out-of-control system;
(3) The maximum temperature that the process reaction can reach during thermal runaway (MTSR)
In thermal runaway, the highest temperature the system can reach when material accumulation reaches its maximum. It is related to the accumulation degree of reaction materials. The greater the accumulation degree of reaction materials, the higher the maximum temperature MTSR that the system can reach after the reaction is out of control;
(4)Decomposition heat
Under a certain temperature and pressure, the heat released or absorbed when all materials decompose is also the reaction heat of the material decomposition reaction;
(5) Apparent reaction heat
Under certain temperature and pressure conditions, the heat released or absorbed when physical or chemical changes occur in the target process, including the sum of the heat released or absorbed by reactions, crystallization, dissolution, decomposition, etc. that occur simultaneously during the target process;
Under adiabatic conditions, the time required for an exothermic reaction to start and reach the maximum reaction rate is the explosion time. Using the arrival time of the maximum reaction rate, you can estimate the possibility of a runaway reaction triggering a secondary decomposition reaction. The longer the time, the lower the possibility of a runaway reaction;
(2) Adiabatic temperature rise (ΔTad)
In an exothermic reaction under adiabatic conditions, all the heat released by the system when the reactants are completely converted leads to an increase in the temperature of the material. It is proportional to the heat release of the reaction. The greater the heat release of the reaction, the higher the adiabatic temperature rise, and the more serious the consequences. It is used to evaluate the possible severity of the out-of-control system;
(3) The maximum temperature that the process reaction can reach during thermal runaway (MTSR)
In thermal runaway, the highest temperature the system can reach when material accumulation reaches its maximum. It is related to the accumulation degree of reaction materials. The greater the accumulation degree of reaction materials, the higher the maximum temperature MTSR that the system can reach after the reaction is out of control;
(4)Decomposition heat
Under a certain temperature and pressure, the heat released or absorbed when all materials decompose is also the reaction heat of the material decomposition reaction;
(5) Apparent reaction heat
Under certain temperature and pressure conditions, the heat released or absorbed when physical or chemical changes occur in the target process, including the sum of the heat released or absorbed by reactions, crystallization, dissolution, decomposition, etc. that occur simultaneously during the target process;
Assessment Criteria
Thermal stability risk assessment standard for materials (raw materials, intermediates, semi-finished products, products, waste)
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