Method for measuring enthalpy change of carbon dioxide absorption reaction of absorbent solution by isothermal calorimeter

Abstract

The invention discloses a method for measuring enthalpy change of carbon dioxide absorption reaction of an absorbent solution by an isothermal calorimeter. Nitrogen and carbon dioxide enter a pre-constant-temperature system T1 and a pre-constant-temperature system T2 in a constant temperature bath through a nitrogen gas tank and a carbon dioxide gas tank respectively, are switched by a three-way valve, step by step enter a mass flowmenter, a solvent saturation pool, a constant temperature system of the calorimeter and the calorimeter in serial connection, and react and are absorbed in the absorbent solution in a heat measuring pool of the calorimeter, and residual gas is dehydrated and then evacuated by the mass flowmeter. Constant temperature and constant pressure conditions are used, fewer sample is used, the balancing speed is high, the method is suitable for synchronous thermodynamics and dynamics research of liquid phase absorbing gas phase or gas-liquid multiphase reaction, and the method has an application value.

Description

technical field [0001] The invention belongs to the technical field of methods for directly measuring the enthalpy change of gas in a liquid phase by using a calorimeter, and in particular relates to a method for measuring the enthalpy change of an absorbent solution absorbing carbon dioxide by using an isothermal calorimeter. Background technique [0002] The current phenomenon of global warming and the increasing CO in human activities 2 Emissions are closely related. Various technological innovations for energy saving and emission reduction are to reduce the greenhouse gas CO 2 concentration, and the high-speed development of science and technology is indeed the energy consumption per unit output and CO 2 The reduction of emissions has made an important contribution. However, due to population growth and increased production, CO 2 The total amount of emissions continues to increase. Therefore, research and development are carried out to capture CO from emission sourc...

AI Technical Summary

Problems solved by technology

However, due to the mass transfer at the gas-liquid interface, it is difficult to control the exact same experimental conditions for this research method with separate thermodynamics and kinetics. It is necessary to study CO from the perspectives of thermodynamics and kinetics at the same time. 2 The absorption process, established in situ in a calorimeter for isothermal and isobaric CO 2 Simultaneous measurement of thermodynamics and kinetics of absorption is the most direct and should be the most effective method

In order to achieve this simultaneous measurement, a more precise nanojoule calorimeter is required from an experimental point of view, but there is currently no suitable method for this CO 2 in situ absorption commodity calorimeter

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