Method for directly determining components in multicomponent system adopting raman spectrum
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A Raman spectroscopy and system technology, applied in Raman scattering, material analysis by optical means, material analysis, etc., can solve the problems of affecting the authenticity of data, cumbersome operation, low accuracy, etc., to achieve high accuracy, guarantee Authentic, easy-to-use effects
Active Publication Date: 2017-01-11
OPTOTRACE SUZHOU TECH
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[0003] The technical problem to be solved by the present invention is to provide a method for directly determining the components of a multi-component system by using Raman spectroscopy, so as to solve the above-mentioned deficiencies in the prior art, such as cumbersome operation, low accuracy, and affecting data authenticity
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Embodiment 1
[0036] In the first embodiment, the process of determining the volume percentage of a component cyclohexane in a cyclohexane-n-hexane-ethanol ternary liquid phase system is used to illustrate the method proposed by the present invention.
[0037] A method for directly determining the components of a multi-component system by using Raman spectroscopy, wherein the multi-component system is a ternary liquid phase system of cyclohexane-n-hexane-ethanol, and the component to be quantified is cyclohexane. The method includes the following steps:
[0038] ①In a volumetric flask, prepare a series of homogeneous solutions of a ternary liquid phase system of cyclohexane-n-hexane-ethanol with a known content. N: According to the volume percentage of component A to be quantified, the cyclohexane is in the range of 0-100% Prepare 6 samples of homogeneous solution N within (8.0%, 16.0%, 30.0%, 50.0%, 70.0%, 90.0%), and the remaining component B n-hexane and component C ethanol are formed in rando...
Embodiment 2
[0049] The second embodiment illustrates the method proposed by the present invention by determining the mass percentage of a component n-hexane in a cyclohexane-n-hexane-ethanol ternary liquid phase system.
[0050] A method for directly determining the components of a multi-component system by using Raman spectroscopy, wherein the multi-component system is a ternary liquid phase system of cyclohexane-n-hexane-ethanol, and the component to be quantified is n-hexane. The method includes the following steps:
[0051] ①In a volumetric flask, prepare a series of homogeneous solutions of a ternary liquid phase system of cyclohexane-n-hexane-ethanol with a known content. N: According to the volume percentage of component B to be quantified, the volume percentage of n-hexane is in the range of 0-100% (8.0%, 16.0%, 30.0%, 50.0%, 70.0%, 90.0%) Prepare 6 samples of homogeneous solution N, the remaining component A cyclohexane, component C ethanol in random proportions; further preparation is...
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Abstract
The invention discloses a method for directly determining components in a multicomponent system adopting a raman spectrum, and relates to a measuring method of the components in the multicomponent system. The method comprises the steps that 1, the raman spectrums is measured, wherein the raman spectrum of a pure solution of each component in the multicomponent system to be tested and the raman spectrum of a homogeneous solution M of the unknown-content multicomponent system to be tested are respectively measured; 2, each raman spectrum is converted to an integral spectrum through a computer, wherein the integral spectrum of the component to be quantified is recorded as SI, the matrix formed by the integral spectrums of the other components is recorded as SJ, and the integral spectrum of the homogeneous solution M is recorded as SPI; 3, the vector quantity-space included angle theta between SI and SJ is calculated, and the vector quantity-space included angle beta between SPI and SJ is also calculated; 4, the content of the component to be quantified in the homogeneous solution M is obtained through calculating the ratio of beta and theta. According to the method, direct measurement of each phase in the multicomponent system can be realized conveniently, the operation is simple and the data is real, moreover, the method can be used for the phase equilibrium study on a liquid-liquid multicomponent system and process condition control of a series of separation unit operations such as extraction and rectification.
Description
Technical field [0001] The invention relates to a method for measuring the components of a multiple system, in particular to a method for directly determining the components of a multiple system by using Raman spectroscopy. Background technique [0002] In the multi-element liquid system, the determination of the content of the components in each phase during phase equilibrium is a common and important task in the teaching and research of chemistry and chemical engineering, such as the drawing of multi-equilibrium phase diagrams, the selection of extraction process conditions, and so on. At present, the existing methods either use chromatographic analysis after sampling, or use the relationship between refractive index and material composition, or use system turbidity changes for characterization. These methods have disadvantages such as cumbersome operation or low accuracy; in addition, due to the sensitivity of phase equilibrium , Contact operations such as sampling may disturb...
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