In-situ on-line measurement method for solubility of CO2in pure water

Abstract

The invention provides an in-situ on-line measurement method for solubility of CO2 in pure water. The method comprises two parts as follows: drawing a standard curve and measuring solubility of CO2 inpure water. The method has the advantages of being direct, low-consumption, accurate and convenient, realizing continuous operation and the like, temperature gradient of the reaction can be effectively reduced by a quartz capillary tube, and the defects that bulk temperature is lower than set temperature and measurement value is too large when the system is under the condition close to the environment temperature are overcome; besides, according to the method, in-situ on-line analysis based on Raman spectrum is applied to the system innovatively, a peak height ratio of CO2 to pure water in the system is detected and calculated in a certain period of time, whether the system reaches thermodynamics balance is judged by measured value comparison, accuracy of measured CO2-H2O system solubility is guaranteed, and a new thinking is provided for research of measuring dissolution characteristics of CO2 in geological sequestration under conditions of certain temperature and pressure.

Description

(1) Technical field [0001] The invention relates to an in-situ online measurement of CO 2 Solubility method in pure water. (2) Background technology [0002] With the rapid development of contemporary social economy, people use a lot of fossil fuels in order to speed up economic development, and the combustion of fossil fuels causes a lot of CO 2 gas emissions. CO 2 It is the chief culprit of global warming and environmental change. It has a long life span, large emissions, and contributes the most to the "greenhouse effect". According to the EDGAR report composed of the European Commission (European Commission) and the Netherlands Environmental Assessment Agency (Netherlands Environmental Assessment Agency), the world's carbon dioxide emissions reached 35.3 billion tons in 2015, of which China's carbon dioxide emissions reached 10.3 billion tons, becoming the world's No. A major carbon dioxide emitter. Therefore, reducing the greenhouse gas CO 2 The emission of emissi...

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Problems solved by technology

However, we found that the traditional method has some defects: the static analysis method is easy to destroy the system balance during the sampling process, and the static synthesis method is easy to destroy the system balance in the CO 2 There are errors in quantification, and the volume of the autoclave is large, resulting in a large amount of sample, high energy consumption of equipment, slow mass transfer rate, and difficult balance of mass transfer

French National Center for Scientific Research S.Marre team (Liu N, Aymonier C, Lecoutre C, et al. Microfluidic approach for studying CO 2 solubility in water and brine using confocal Raman spectroscopy) and the Laura.J.Bonales team of Complutense University in Spain (Bonales LJ, V, Prieto-Ballesteros O. Raman spectroscopy as a tool to study the solubility of CO 2 in magnesium sulfate brines: application to the fluids of Europa’s cryomagmatic reservoirs) using microreactors combined with Raman spectroscopy to carry out CO 2 Solubility studies in brine layers, but not quantification of CO 2 Solubility; Lu Wanjun's team (Guo H R, Chen Y, Hu Q C, etal. Quantitative Raman spectroscopic investigation of geo-fluids high-pressurephase equilibria: Part I. Accurate calibration and determination of CO 2 solubility in water from 273.15to 573.15K and from 10 to 120MPa) quantitatively and systematically determined CO using Raman spectroscopy 2 Solubility studies in water, but its operation requires mercury seal technology to prepare different known CO 2 Concentration of standard samples, complex operation, and different data points cannot achieve continuous measurement

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