Device and method for measuring gas-liquid chemical reaction rate based on volumetric method

Abstract

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...

AI Technical Summary

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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