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,

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

Example Embodiment

[0038] Example 1:

[0039] Soak a 2mL glass sample bottle in a 5% dichlorodimethylsilane-containing n-hexane solution. After standing for 8 hours, take out the glass sample bottle, wash it with methanol and n-hexane, and dry it in an oven at 60℃ , Get the silanized glass sample bottle; weigh 5mg magnetic nano silica gel particles in the silanized glass sample bottle, add 0.1mL 10wt% ammonia water, vortex and mix, and place it on the square magnet (specification 20mm×15mm×10mm) Under the action, use a pipette to take out the excess ammonia water free from the magnetic nano silica gel particles to obtain ammonia water-coated magnetic nano silica gel particles; add 1 mL of the silanized glass sample bottle containing the ammonia water-coated magnetic nano silica gel particles to the silanized glass sample bottle containing 0.1 g / mL crude oil n-hexane sample solution, vortex for 2min. At this time, the magnetic nano silica gel particles coated with ammonia water are dispersed in the ...

Example Embodiment

[0040] Example 2:

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

Example Embodiment

[0042] Example 3:

[0043] The difference between this embodiment and embodiment 1 is only that: the 10 mL glass sample bottle is immersed in the 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 added amount of crude oil sample solution is 4mL, the dilution factor of crude oil sample is 10 times, and the added amount of acetone is 0.4mL; the rest is basically the same as in 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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