Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for analyzing and detecting octadecyl dimethyl betaine in crude oil by liquid chromatography

A technique for analyzing octadecyldimethyl beet and liquid chromatography, which is applied in the field of analytical chemistry, can solve the problems of rare betaine amphoteric surfactants and the like, and achieves the effects of high sensitivity and good repeatability

Active Publication Date: 2022-02-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, up to now, there are few methods for the analysis and detection of betaine amphoteric surfactants in crude oil

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
  • Method for analyzing and detecting octadecyl dimethyl betaine in crude oil by liquid chromatography
  • Method for analyzing and detecting octadecyl dimethyl betaine in crude oil by liquid chromatography
  • Method for analyzing and detecting octadecyl dimethyl betaine in crude oil by liquid chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of samples to be tested

[0036] Take 2 mL each of the three crude oil samples to be tested, 6AT235, 6AT216, and 6A237, dilute them with 2 mL of n-hexane, mix well, and then use 4 mL of ethanol / water mixture to extract the betaine surface activity in the crude oil / n-hexane mixture. agent, let it stand for stratification, take the ethanol / water extract, and inject 20 µL.

[0037] 2. Detection

[0038] Chromatographic conditions: chromatographic column: 25 cm C18 chromatographic column; mobile phase: acetonitrile / water mixture (volume ratio 3 / 2), flow rate 1.0 mL / min; detector: mass spectrometer detector, ESI source, positive mode detection;

[0039] Under the above chromatographic conditions, 20 μL of the ethanol / water extract was injected, and there was no octadecyldimethyl betaine chromatographic peak around 11.0 min, which proved that none of the three crude oils contained octadecyldimethyl betaine .

Embodiment 2

[0041] 1. Sample preparation

[0042] Add 100 mg / L octadecyl dimethyl betaine to 6AT235, 6AT216, and 6A237 three crude oils respectively, take 2 mL of the above-mentioned spiked crude oil samples, dilute with 2 mL of n-hexane, mix well, and then use 4 Extract the spiked betaine surfactant in the crude oil / n-hexane mixed solution with mL ethanol / water mixture, let stand to separate the layers, take the ethanol / water extract, and inject 20 µL.

[0043] 2. Detection

[0044] Chromatographic conditions: with embodiment one;

[0045] Under the above chromatographic conditions, 20 μL of ethanol / water extract was injected, and octadecyldimethyl betaine peaked around 11.0 min (see figure 2 ), measure the chromatographic peak area of ​​octadecyldimethyl betaine in different crude oils;

[0046] According to the linear relationship: Y = 98992000 + 9638310 X, the concentrations of octadecyldimethyl betaine in the three crude oils of 6AT235, 6AT216 and 6A237 are calculated, w...

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

No PUM Login to View More

Abstract

The invention discloses a method for analyzing and detecting octadecyldimethyl betaine in crude oil by liquid chromatography, including (1) sample pretreatment: mixing the crude oil sample to be detected with n-hexane at a volume ratio of 1:1 After homogeneity, use an equal volume of ethanol-free / water mixed solution to extract the betaine surfactant in the above crude oil / n-hexane mixed solution, let it stand for stratification, and the extract is used as the injection sample; (2) Chromatographic conditions: the chromatographic column is 25 cm C18 chromatographic column; the mobile phase is a mixture of acetonitrile / water (volume ratio 3 / 2); mass spectrometry detector, ESI source, positive mode detection; (3) Quantification by external standard method: determination of octadecane in the extract The peak area of ​​octadecyl dimethyl betaine was calculated according to the linear relationship to calculate the concentration of octadecyl dimethyl betaine in crude oil samples. This method has the characteristics of accuracy, reliability, good repeatability, and high sensitivity, and provides technical support for the study of the migration law of oil displacement agents in the reservoir environment.

Description

technical field [0001] The invention relates to a method for determining octadecyl dimethyl betaine amphoteric surfactant in crude oil, in particular to a method for determining octadecyl dimethyl betaine in crude oil by high performance liquid chromatography, which belongs to Analytical chemistry technology field. Background technique [0002] Surfactant plays an important role in tertiary oil recovery, and its mechanism of action is to effectively reduce the interfacial tension of oil and water, enhance the emulsification performance of the system, and then enhance oil recovery. Octadecyl dimethyl betaine amphoteric surfactant has been widely used in the field of tertiary oil recovery due to its excellent interfacial properties in recent years. The structure of octadecyl dimethyl betaine amphoteric surfactant is an amphoteric surfactant composed of octadecyl dimethyl quaternary ammonium salt cationic group and carboxylate anionic group. Its structural formula is as follow...

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): G01N30/88
CPCG01N30/88G01N2030/884G01N2030/027
Inventor 王立成王磊王旭生郭勇梁晓静李亦婧
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com