Gemini surfactant preparation method

A technology of gemini surfactants and active agents, which is applied in the field of preparation of gemini surfactants, and achieves the effects of simple preparation methods, good water solubility, and easy operation

Inactive Publication Date: 2016-07-20
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The curing mechanism of gemini surfactants in oil reservoir clay anti-swelling is similar to that of expansive soil curing agents, but the application of gemini surfactants in expansive soils has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of gemini surfactant, comprises the following steps:

[0031] (1) Synthesis of intermediate N-(3-chloro-2-hydroxypropyl)-N,N-dimethyloctyl ammonium chloride

[0032] Add 4.25mL of hydrochloric acid and 10mL of water into a three-necked round-bottomed flask, heat and reflux at 40°C and stir, and drop 10mL of N,N-dimethyloctylamine at a rate of 0.1-0.5mL per minute. Add 6.25mL epichlorohydrin dropwise at a rate of 0.3mL, and determine the end point by measuring the content of hydroxypropyl quaternary ammonium salt. After the reaction was completed, vacuum rotary evaporation was carried out to obtain a light yellow transparent paste. The product was extracted by cyclohexane (3*30mL). liquid.

[0033] (2)C 8 -3(OH)-C 8 2Cl － Synthesis

[0034] Put the intermediate product of step (1) into a three-necked round-bottomed flask, use isopropanol and water (1:1) as the solvent, heat and reflux at 70°C and stir, and drop 10mL of N,N at a rate of 0.1-0.5m...

Embodiment 2

[0036] A preparation method of gemini surfactant, comprises the following steps:

[0037] (1) Synthesis of intermediate N-(3-chloro-2-hydroxypropyl)-N,N-dimethyloctyl ammonium chloride

[0038] Add 4.25mL of hydrochloric acid and 10mL of water into a three-necked round-bottomed flask, heat and reflux at 40°C and stir, and drop 10mL of N,N-dimethyloctylamine at a rate of 0.1-0.5mL per minute. Add 6.25mL epichlorohydrin dropwise at a speed of about 0.3mL, and determine the end point by measuring the content of hydroxypropyl quaternary ammonium salt. After the reaction was completed, vacuum rotary evaporation was carried out to obtain a light yellow transparent paste. The product was extracted by cyclohexane (3*30mL). liquid.

[0039] (2)C 8 -3(OH)-C 8 2Cl － Synthesis

[0040] Put the intermediate product of step (1) into a three-necked round-bottomed flask, use isopropanol and water (1:1) as the solvent, heat and reflux at 80°C and stir, and drop 11mL of N,N- Dimethylocty...

Embodiment 3

[0042] A preparation method of gemini surfactant, comprises the following steps:

[0043] (1) Synthesis of intermediate N-(3-chloro-2-hydroxypropyl)-N,N-dimethyloctyl ammonium chloride

[0044] Add 4.25mL of hydrochloric acid and 10mL of water into a three-necked round-bottomed flask, heat and reflux at 30°C and stir, add 10mL of N,N-dimethyloctylamine dropwise at a rate of 0.1-0.5mL per minute, and react for 1 hour, then Add 6.25mL epichlorohydrin dropwise at a speed of about 0.3mL, and measure the content of hydroxypropyl quaternary ammonium salt [12] to determine the endpoint. After the reaction was completed, vacuum rotary evaporation was carried out to obtain a light yellow transparent paste. The product was extracted by cyclohexane (3*30mL). liquid.

[0045] (2)C 8 -3(OH)-C 8 2Cl － Synthesis

[0046] Put the intermediate product of step (1) into a three-necked round-bottomed flask, use isopropanol and water (1:1) as the solvent, heat and reflux at 80°C and stir, a...

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Abstract

The invention discloses a gemini surfactant preparation method including the following steps: (1) synthesis of an intermediate N-(3-chloro-2-hydroxypropyl)-N,N-dimethyl octyl ammonium chloride; and (2) synthesis of the gemini surfactant N,N'-bis(octyl dimethyl)-2-hydroxy-1,3-dichloropropane diammonium salt. The gemini surfactant prepared by the gemini surfactant preparation method has good water solubility, and can form different mass fractions of solutions with water; the surfactant has small molecular weight and low viscosity, thereby being in favor of permeability in rock layers; the surfactant contains active groups -OH, thereby having active chemical properties; ammonium salt is conducive to growth of plants, is safe and has no pollution; and the preparation method is simple, and is easy to operate.

Description

technical field [0001] The invention relates to the field of surfactants, in particular to a preparation method of gemini surfactants. Background technique [0002] Gemini surfactant is a surfactant with special structure containing two hydrophilic groups, two hydrophobic groups and one linking group. Its birth is a milestone in the surfactant industry. According to the different types of charge carried by the hydrophilic group, it can be divided into anionic, cationic, nonionic and zwitterionic gemini surfactants. Gemini surfactants have attracted widespread attention since they were first synthesized by Bunton et al. in 1971. Since Professor Zhao Jianxi introduced the research progress of gemini surfactants in detail for the first time in 1999, it has been highly valued by various domestic industries and conducted in-depth research. At present, gemini surfactants are mainly used in industries such as oil and gas exploration, chemical industry, nanomaterials, biotechnolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C215/40C07C213/00C09K8/035
CPCC07C213/00C07C213/04C09K8/035C07C215/40
Inventor 熊德元丁世磊张信贵钱伟文陆晓清
Owner GUANGXI UNIV
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