Method and device for in-situ online determination of solubility of CO2 in alkane

Abstract

The invention discloses a method and a device for in-situ online determination of solubility of CO2 in alkane. The device comprises a confocal microscopic Raman spectrometer, a high-pressure ventilation pipeline, a circulation balance pipeline system, a cooling and heating table and the like. Because the property of the alkane is changed due to temperature change, an electric heating device is arranged on the phase equilibrium kettle, and a pipeline of the circulation equilibrium pipeline system is coated with a heat preservation layer so as to keep the consistency of the temperature of the system. According to the method disclosed by the invention, CO2 is quantitatively injected into a CO2-alkane system in batches by utilizing a high-pressure ventilation pipeline; the method further includes detecting and recording peak-height ratio values of C-H telescopic vibration peaks of CO2 Fermi double bonds and alkane in the CO2-alkane system under the CO2 gradient concentration, drawing a standard curve taking the CO2 concentration as an abscissa and the peak-height ratio as an ordinate, and then determining the solubility of CO2 in alkane. The method provided by the invention has the characteristics of high data credibility, no need of sampling, safety, high efficiency, intuition, strong operability, repeated operation and the like.

Description

technical field [0001] The invention relates to an in-situ online measurement of CO 2 Method and apparatus for solubility in alkanes. Background technique [0002] With the rapid development of the social economy and the continuous progress of the industry, people's living standards have also improved, and the basic necessities of life have become more and more convenient. But at the same time, a large amount of carbon dioxide (CO2) is emitted from activities such as fossil fuel combustion and industrial operations. 2 ) and other greenhouse gases (GHG) are becoming increasingly apparent. The global average temperature increase, the occurrence of extreme weather and the acidification of sea water have received more and more attention, and the reduction of CO 2 The emission of greenhouse gases has become a common concern of all mankind and an important issue that needs to be solved urgently. [0003] In recent years, CCS has always been the focus of the international commu...

AI Technical Summary

Problems solved by technology

The gas PVT measurement method cannot determine the temperature and pressure range of the entire system measurement; the equilibrium liquid sampling analysis method is easy to change the original temperature and pressure conditions during the sampling process and the system balance is destroyed; the pressure cannot be accurately controlled when the bubble point pressure method is measured. The result is less accurate

Most researchers use CO 2 -The temperature and pressure changes before and after the appearance of bubbles in the crude oil / simulated oil system are used to judge whether the dissolution process has reached equilibrium. This method is easily affected by factors such as the experimental environment and the subjectivity of the personnel, resulting in differences in the judgment results, and the sampling analysis method will break the original system. The phase equilibrium state reduces the accuracy of the experimental results

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