Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of solid-phase extraction removes the method for n-paraffin in oil product

A technology for n-alkanes and oil products, which is applied in the preparation of test samples, instruments, measuring devices, etc., can solve the problems of complicated process and long time consumption, and achieve the effect of short time consumption, high recovery rate and high purity

Active Publication Date: 2021-04-06
CHINA PETROLEUM & CHEM CORP +1
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the urea complexation method is effective in separating n-paraffins, it takes a long time and takes about 3-4 hours for a separation. In the step of filtration and separation, there is isopropanol in the filtrate, which will bring part of urea into the non-normal alkanes. Among the paraffin components, it is necessary to perform 2-3 repeated filtration-solvent recovery operations to obtain relatively pure non-normal paraffin components, and the process is very complicated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of solid-phase extraction removes the method for n-paraffin in oil product
  • A kind of solid-phase extraction removes the method for n-paraffin in oil product
  • A kind of solid-phase extraction removes the method for n-paraffin in oil product

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] (1) Preparation of urea stationary phase

[0037] Dissolve 10g of urea in 200mL of isopropanol. After the urea is completely dissolved, add 1g of silica gel to it at 65°C, and ultrasonically treat it for 15 minutes to load the urea on the silica gel. Cool naturally to 25°C, and then cool down to 0-5°C. Place at low temperature for 12 hours, evaporate the solvent to dryness, and dry the obtained solid at 80°C for 15 minutes to obtain a stationary phase.

[0038] (2) Removal of n-alkanes in oil products

[0039] Take 4g of the stationary phase prepared in step (1) and load it into a solid-phase extraction column, add 75 μL of paraffin-based straight-run diesel oil sample to the solid-phase extraction column at 25 ° C, then add 800 μL of isopropanol as an activator, and let it stand for 5 minutes , add 2mL of n-hexane and let it stand for 10 minutes to dissolve the non-normal alkanes not complexed by urea in the solid phase extraction column. Then wash the solid-phase ex...

example 2

[0041] Remove the n-paraffins in the paraffin-based straight-run diesel oil according to the method of example 1, the difference is that in (1) step, 10g urea is dissolved in 200mL isopropanol, 30g silica gel is added thereto, after loading, drying have a stationary phase. (2) In step (2), the stationary phase loaded into the solid phase extraction column is 4 g, and then 100 μL of paraffin-based straight-run diesel oil sample and 1050 μL of isopropanol are added successively as an activator, and 2 mL of n-hexane is added, left to stand for 10 minutes, and 6 mL of n-hexane The eluate was obtained by washing the alkane three times. The purity of the non-normal paraffin component was measured to be 98.15% by mass, and the recovery rate of the non-normal paraffin was 92.34% by mass.

example 3

[0043] Remove normal paraffins in paraffin-based straight-run diesel oil according to the method of Example 1, the difference is that in (1) step, 1g urea is dissolved in 20mL isopropanol, 10g silica gel is added thereto, after loading, drying have a stationary phase. (2) In step (2), the stationary phase loaded into the solid-phase extraction column is 4 g, and then 50 μL of paraffin-based straight-run diesel oil sample and 500 μL of isopropanol are added successively as an activator, 2 mL of n-hexane is added, and left standing for 10 minutes. The alkane was washed three times to obtain an eluent, and the purity of the non-normal paraffin component was measured to be 98.13% by mass, and the recovery rate of the non-normal paraffin was 89.82% by mass.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
boiling pointaaaaaaaaaa
particle diameteraaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

A method for removing normal alkanes in oil products by solid phase extraction, comprising dissolving urea in an organic solvent, adding a carrier to it at 60-75°C, loading the urea on the carrier, removing the solvent, and obtaining a stationary phase. The carrier described above is silica gel or alumina, and the stationary phase prepared is loaded into a solid-phase extraction column, and the oil sample to be tested and the activator are added to the stationary phase, left to stand, and then extracted with C 5 ~C 7 The n-paraffin is used as the eluent to wash the stationary phase, and the eluent obtained by washing is collected to obtain the oil product from which the n-paraffin has been removed. The organic solvent and the activator are all selected from methanol, ethanol, propanol or isopropanol alcohol. This method can effectively remove n-alkanes in oil products.

Description

technical field [0001] The present invention relates to a kind of method that solid phase extraction removes normal paraffin in oil product, specifically, is the method that adopts the stationary phase of loading urea to remove normal paraffin from oil product. Background technique [0002] Petroleum is a complex mixture containing thousands of compounds that can cause some interference in the qualitative and quantitative analysis of isoparaffins in oil by chromatography and mass spectrometry. In order to improve the detection sensitivity of isoparaffins, it is necessary to reduce the interference of other components in the oil sample, so it is necessary to separate the aromatics, normal paraffins and naphthenes in the oil sample. [0003] At present, the technologies for separating normal alkanes from oil products mainly include 5A molecular sieve adsorption method and urea complexation method. Molecular sieve is a synthetic zeolite, which belongs to crystalline alkali met...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/34G01N30/06
CPCG01N1/34G01N30/06
Inventor 蒋婧婕刘颖荣刘泽龙田松柏
Owner CHINA PETROLEUM & CHEM CORP