Method for measuring and calculating dynamic heat capacity of adiabatic reaction calorimetry samples

A technology of adiabatic reaction and samples, applied in the field of chemical safety testing technology and instruments

Active Publication Date: 2017-05-10
CHINA JILIANG UNIV
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Problems solved by technology

The precise measurement of specific heat capacity can generally be carried out without chemical reaction of the substance. For example, a low-temperature precision calorimeter based on the principle of heat dissipation compensation and adiabatic calorimetry[6] can be used to measure the heat capacity of a substance in equilibrium, but it cannot be used Dynamic measurement of specific heat capacity during chemical reaction under adiabatic conditions

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  • Method for measuring and calculating dynamic heat capacity of adiabatic reaction calorimetry samples
  • Method for measuring and calculating dynamic heat capacity of adiabatic reaction calorimetry samples
  • Method for measuring and calculating dynamic heat capacity of adiabatic reaction calorimetry samples

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0045] 1, there is following simplified condition in the method of the present invention: suppose sample specific heat capacity is only a function of temperature:

[0046] In fact, the specific heat capacity of the sample is not only related to temperature during the reaction process, but also affected by the concentration of reactants. For the control side where the reaction path is shifted, because of the difference in reaction progress, the sample concentration at the same temperature is different from that of the adiabatic side, and the actual specific heat capacity-temperature function also deviates from that of the adiabatic side. Compared with the change of specific heat capacity in the whole reaction process, the specific heat capacity deviation is relatively small, so it is ignored in the calculation.

[0047] 2. Before the start of the reaction and...

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Abstract

The invention discloses a method for measuring and calculating dynamic heat capacity of adiabatic reaction calorimetry samples. The method is provided with an adiabatic reaction calorimetry device with two-channel asymmetric sample pool structures, data of adiabatic condition reaction process and path offset reaction process can be measured by the adiabatic reaction calorimetry device and are processed by the aid of an energy-balance equation, and a specific heat capacity-temperature variation function of the samples close to real rules is acquired by the aid of constant approximation of an interpolation function and a dynamic estimation method of reactant concentration. According to the method, approximate heat capacity-temperature variation rules of the samples of the adiabatic reaction process can be acquired, key index-reaction heat calculated according to the heat capacity-temperature variation rules is closer to real conditions, and more accurate reference is provided for heat hazard evaluation of reactants.

Description

technical field [0001] The invention belongs to the field of chemical safety testing technology and instruments, and relates to a design based on the structure of a traditional adiabatic reaction calorimeter, and a method for measuring and calculating the change in specific heat capacity of a sample during a reaction process by using the deviation of the reaction path and the dynamic estimation of the reactant concentration. Background technique [0002] Dow's chemistry was the first to propose the adiabatic reaction calorimetry method and device [1-3], the schematic diagram is as follows figure 1 As shown, the sample cell 5 holding the reactant sample 4 is suspended in the cavity of the temperature control furnace 7, and is heated by the furnace body heater 1 and the radiation heater 6 until the initial reaction temperature is reached, and the temperature of the furnace body thermocouple 2 is detected. signal to control the temperature of the furnace body 7 to track the tem...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 许启跃叶树亮杨遂军丁炯
Owner CHINA JILIANG UNIV
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