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Magnetic liquid drop dispersion and extraction method for separating petroleum acid

A magnetic droplet and petroleum acid technology, applied in separation methods, liquid solution solvent extraction, material separation, etc., can solve problems such as poor reproducibility of liquid-liquid extraction, difficult preparation of adsorbents, cumbersome and time-consuming operations, etc., to achieve improved The effect of recovery and sensitivity, high practical value, and high mass transfer efficiency

Inactive Publication Date: 2018-09-14
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As one of the most common sample pretreatment methods, liquid-liquid extraction has the advantages of being easy to reproduce in different laboratories and requiring less equipment, but it has disadvantages such as large solvent consumption, easy emulsification, cumbersome and time-consuming operation, and low throughput; Solid-phase extraction can circumvent these shortcomings, but there are problems such as the need for special equipment, difficulty in preparing specific adsorbents, or high cost, and the reproducibility in different laboratories is not as good as that of liquid-liquid extraction.

Method used

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  • Magnetic liquid drop dispersion and extraction method for separating petroleum acid
  • Magnetic liquid drop dispersion and extraction method for separating petroleum acid
  • Magnetic liquid drop dispersion and extraction method for separating petroleum acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Soak a 2mL glass sample bottle in n-hexane solution containing 5% dichlorodimethylsilane, take it out after standing for 8 hours, wash it with methanol and n-hexane, and dry it in an oven at 60°C , to obtain a silanized glass sample bottle; weigh 5 mg of magnetic nano-silica gel particles and place them in a silanized glass sample bottle, add 0.1 mL of 10 wt % ammonia water, vortex and mix them, and put Under the action, use a pipette to take out the excess ammonia water free from the magnetic nano silica gel particles to obtain the magnetic nano silica gel particles coated with ammonia water; add 1mL containing 0.1 The n-hexane sample solution of g / mL crude oil was vortexed for 2 minutes. At this time, the magnetic nano-silica gel particles coated with ammonia water were dispersed in the sample in the form of magnetic droplets. After the extraction, the raffinate was taken out under the action of a square magnet. Add 1 mL of n-hexane to the silanized glass sample bottle...

Embodiment 2

[0041] The difference between this embodiment and embodiment 1 is only that: the glass sample bottle of 5mL is soaked in the n-hexane solution containing 8% dichlorodimethylsilane, the consumption of magnetic nano-silica gel particles is 2mg, and the concentration of ammonia water is 15wt%, the addition of crude oil sample solution is 2mL, the dilution factor of crude oil sample is 6 times, the addition of acetone is 0.3mL; the rest is basically the same as embodiment 1.

Embodiment 3

[0043] The difference between this embodiment and embodiment 1 is only that a glass sample bottle with a specification of 10 mL is soaked in a n-hexane solution containing 9% dichlorodimethylsilane, the amount of magnetic nano-silica gel particles is 10 mg, and the concentration of ammonia water is 18wt%, the addition of crude oil sample solution is 4mL, the dilution factor of crude oil sample is 10 times, the addition of acetone is 0.4mL; the rest is basically the same as Example 1.

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Abstract

The invention provides a magnetic liquid drop dispersion and extraction method for separating petroleum acid. The magnetic liquid drop dispersion and extraction method comprises the following steps: carrying out silylation hydrophobic modification on an extraction container; preparing magnetic particles coated with an extracting agent in the silylation extraction container; adding a crude oil sample solution into the silylation extraction container and carrying out vortex oscillation to disperse the magnetic particles coated with the extracting agent into the crude oil sample solution to formmagnetic liquid drops; extracting petroleum acid in a crude oil sample; after finishing extraction, taking out raffinate and discharging under the action of an additional magnet; adding a washing solvent into the silylation extraction container and carrying out the vortex oscillation; taking out washing liquid and discharging under the action of the additional magnet; adding a desorption solvent into the silylation extraction container and carrying out desorption; dissolving a liquid-state extracting agent dissolved with petroleum acid through a desorption solvent and removing the magnetic particles; taking out desorption liquid and collecting under the action of the additional magnet. The method provided by the invention is simple and rapid to operate, has less consumption of the solventsand can be used for treating various samples in batches.

Description

technical field [0001] The invention relates to the technical field of sample pretreatment, in particular to a magnetic droplet dispersion extraction method for petroleum acid separation. Background technique [0002] Acidic compounds in crude oil, namely petroleum acids, including fatty acids and naphthenic acids, are important molecular markers for studying petroleum geochemical content such as petroleum origin and biodegradation. In addition, the content and composition of petroleum acid are also important parameters for research on corrosion protection of crude oil processing equipment and environmental risk assessment. Due to the extreme complexity of crude oil samples, it is necessary to selectively separate petroleum acid before instrumental analysis. Currently, petroleum acid separation mainly adopts liquid-liquid extraction and solid-phase extraction. As one of the most common sample pretreatment methods, liquid-liquid extraction has the advantages of being easy t...

Claims

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Application Information

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IPC IPC(8): G01N30/06B01D11/04
CPCB01D11/0419G01N30/06G01N2030/062
Inventor 朱钢添刘飞何生
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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