Device and method for measuring gas-liquid chemical reaction rate based on volumetric method
A technology of chemical reaction rate and gas-liquid reaction, which is applied to the analysis of materials and instruments, can solve the problems of inability to apply high-pressure or high-temperature reaction conditions, increase indication errors and subjectivity, and difficulty in improving efficiency, so as to achieve stable and reliable test performance Effect
Inactive Publication Date: 2015-05-13
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
First of all, syringes, soap bubble flowmeters or measuring cylinders cannot automatically measure the volume, and must be manually operated and read, which increases the error and subjectivity of the indication; secondly, during the gas measurement process, due to the residual gas in the container, Errors caused by frictional resistance or soap bubble collapse are difficult to eliminate; thirdly, such experiments all use glass containers, which cannot be applied to high-pressure or high-temperature reaction conditions; finally, for the reaction rate measurement process under complex conditions, the labor cost is increased due to the inability to realize automation , it is difficult to improve the efficiency
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[0026] The embodiment of the present invention measures the chemical reaction rate of monoethanolamine solution (MEA) and carbon dioxide gas, selects 500mL of 30% MEA solution for use, the volume of metering chamber 5 is 500mL, the volume of gas-liquid reaction chamber 21 is 1000mL, metering chamber thermocouple 7, gas meter Both the thermocouple 24 and the liquid temperature measuring thermocouple 26 are first-class T-type thermocouples with an accuracy of ±0.5°C. The metering chamber pressure sensor 10 adopts a piezoelectric sensor with a pressure range of 0~1MPa and an accuracy of ±0.06%. The reaction chamber pressure sensor 15 adopts a piezoelectric sensor with a working pressure range of 0~0.2MPa, a maximum pressure of 1MPa, and an accuracy of ±0.06%. piezoresistive sensor. The pumping rate of the vacuum pump 13 is 0.5L / s, the gas source gas cylinder 1 to be tested is a 40L carbon dioxide gas cylinder, the maximum pressure is 15MPa, and the maximum range of the pressure r...
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The invention discloses a device and a method for measuring the gas-liquid chemical reaction rate based on a volumetric method, and belongs to the field of chemical reaction engineering. The device consists of a gas source system, a vacuum system, a gas metering system, a gas-liquid reaction system, a heating system, a stirring system, a cooling system and a data acquisition system, wherein a solution and a magnetic stirrer are arranged in a gas-liquid reaction cavity through a liquid inlet; the vacuum pump is used for vacuumizing a metering cavity and the gas-liquid reaction cavity; residual gas is eliminated; a vacuum electromagnetic valve is closed; gas with appointed pressure is fed into the metering cavity; the mole number of the gas is calculated; a gas source electromagnetic valve is closed; then the solution is subjected to temperature control and stirring; when a reaction condition is achieved, a pressure equivalence electromagnetic valve is opened; reaction gas is injected into the gas-liquid reaction cavity; when the pressure is balanced, the pressure equivalence electromagnetic valve is closed; and the chemical reaction rate is obtained by monitoring the change of the gas along with the time in the gas-liquid reaction cavity. According to the device, a test process is automatic, and the temperature control precision and the temperature measurement precision are high; and the device is convenient to operate.
Description
technical field [0001] The invention belongs to the field of chemical reaction engineering, and relates to a device and a measuring method for measuring gas-liquid chemical reaction rate based on a volumetric method, which are suitable for measuring the rate constant when gas and liquid undergo chemical reactions, and obtaining a corresponding rate equation. Background technique [0002] Gas-liquid reaction is a typical process control link in chemical reaction engineering, and plays an important role in the fields of industry, medical treatment, teaching, and scientific research. For example, wet removal of SO from power plant or kiln tail gas 2 , Copper ammonia solution is used to absorb CO in the synthetic ammonia industry, and alkaline solution is used to absorb CO in industrial biogas 2 , NaOH solution is used to absorb residual CO in copper scrubbing 2 , In chemical analysis, copper ammonia solution is used to calibrate the oxygen concentration, and in medical oxygen...
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IPC IPC(8): G01N7/00
Inventor 张辉张四宗张翠珍谭雅倩刘洋
Owner UNIV OF SCI & TECH BEIJING
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