Nuclear magnetic resonance detection methods for Fischer-Tropsch synthesis water compositions

Abstract

The invention belongs to the field of analysis chemistry of Fischer-Tropsch synthesis water composition detection and specifically relates to nuclear magnetic resonance detection methods for Fischer-Tropsch synthesis water compositions. According to a method, on the basis of a three-dimensional nuclear magnetic resonance diffusion sorting spectrum -<1>H-<1>H homonuclear chemical shift correlationspectrum, through utilization of difference of a diffusion rate and a coupling signal of each composition of Fischer-Tropsch synthesis water in a solvent, obtained diffusion rate and coupling signal data is represented in a three-dimensional map form; horizontal and longitudinal coordinates of a map are chemical shift; vertical coordinates are diffusion coefficients; chemical shift planes with different diffusion coefficients are obtained on the vertical coordinates according to the difference of the diffusion coefficient of each composition in the Fischer-Tropsch synthesis water; compounds with the same diffusion coefficient value are identified in sequence according to the coupling signals of the -<1>H-<1>H homonuclear chemical shift correlation spectrum; and each composition in the Fischer-Tropsch synthesis water is detected. According to the method, an obtained analysis result is visual and clear, detection resolution is high, operation is simple, the result is accurate and precision is high. Fischer-Tropsch synthesis water sample compositions can be detected qualitatively and quantitatively. The method is applicable to qualitative detection of various low carbon small molecular compound compositions.

Description

technical field [0001] The invention belongs to the field of analytical chemistry for the detection of water components in Fischer-Tropsch synthesis, and in particular relates to a nuclear magnetic resonance detection method for water components in Fischer-Tropsch synthesis. The invention is based on a three-dimensional nuclear magnetic resonance diffusion sorting spectrum- 1 H- 1 The nuclear magnetic spectrum of the H isonuclear chemical shift correlation spectrum, the nuclear magnetic resonance method of detecting the composition of each component in the Fischer-Tropsch synthesis water by using the difference in the diffusion rate and coupling signal of each component in the Fischer-Tropsch synthesis water in the solvent. Background technique [0002] Fischer-Tropsch synthesis is a key technology in the process of indirect coal liquefaction. It uses synthesis gas as raw material to synthesize paraffin-based liquid hydrocarbon fuels and their chemicals under catalyst and ap...

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Problems solved by technology

Liquid chromatography can avoid complex derivatization operations in most cases by adjusting the polarity of the mobile phase, but usually requires the use of more expensive analytical standards to assist in the completion of structure identification

[0004] Conventional NMR spectra, such as 1 H and 13 C spectrum is very convenient when analyzing pure substances, but the detection of mixtures has the following limitations: 1 In the H NMR spectrum, the signal peaks of the components of the mixture are crowded in a narrow spectrum range (about 20ppm), which easily leads to signal overlap and greatly increases the difficulty of spectrum analysis

13 Although the C NMR spectrum has a large spectral width (about 200 ppm), but 13 C spectrum will lose many important NMR information, such as coupling information, splitting, spectral peak integration, etc., which will also cause great difficulties for material analysis

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