Low-concentration viscoelastic surfactant solution and preparation method thereof

A technology of surfactant and viscoelasticity, which is applied in the field of low-concentration viscoelastic surfactant solution and its preparation, which can solve the problems of difficult post-processing and high concentration of surfactant, achieve good viscoelasticity and reduce the cost of use

Active Publication Date: 2012-01-18
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that a large amount of salt needs to be added to the solution in the prior art, and the concentration of the surfactant

Method used

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  • Low-concentration viscoelastic surfactant solution and preparation method thereof
  • Low-concentration viscoelastic surfactant solution and preparation method thereof
  • Low-concentration viscoelastic surfactant solution and preparation method thereof

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preparation example Construction

[0022] A method for preparing a low-concentration viscoelastic surfactant solution, first preparing a Gemini surfactant, then treating it with a strong basic ion exchange resin to obtain the corresponding quaternary ammonium base, and then obtaining the surfactant through acid-base neutralization The active ingredient is finally compounded with an inorganic salt to obtain the viscoelastic surfactant; wherein, the inorganic salt is sodium nitrate, and the Gemini surfactant is an oleic acid-based Gemini surfactant 18:1-2 -18:1 is obtained by the following reaction:

[0023]

[0024] Among them, oleyl alcohol can be directly purchased from the market, or can be prepared from natural product oleic acid through esterification and reduction. The preparation reaction formula is as follows:

[0025]

[0026] In the alcohol bromination step, oleyl alcohol is first reacted with p-toluenesulfonyl chloride, and then reacted with anhydrous lithium bromide. The molar ratio of oleyl a...

Embodiment 1

[0043] (1) Synthesis of methyl oleate

[0044] Add oleic acid (120 g), anhydrous methanol (120 g) and concentrated sulfuric acid (1 g) into a 500 mL single-necked bottle, and stir and reflux at 82° C. for 6 hours. After cooling, the low boiling point substances were removed, and the organic layer was washed with dilute sodium bicarbonate solution until neutral. Add anhydrous magnesium sulfate and dry overnight. After filtration, the crude product was distilled under reduced pressure to obtain methyl oleate. 176~178℃ / 6mmHg(uncorrected) Yield: 90.0%

[0045] 1 H NMR (300MHz, CDCl 3 , Me 4 Si) δ (ppm): 5.35 (m, 2H, CH=CH), 3.66 (s, 3H, OCH 3 ), 2.30(t, 2H, CH 2 COOCH 3 ), 2.02(t, 4H, CH 2 CH=CHCH 2 ), 1.62(t, 2H, CH 2 CH 2 COOCH 3 ), 1.30~1.27(m, 20H, CH 3 (CH 2 ) 6 CH 2 CH=CHCH 2 (CH 2 ) 4 ), 0.88(t, 3H, CH 3 )

[0046] (2) Synthesis of oleyl alcohol

[0047]Add methyl oleate (52 g) and tetrahydrofuran (207 g) after sodium-benzophenone reflux to remove wat...

Embodiment 2

[0066] Synthesis of 1-bromo-cis-9-octadecene:

[0067] Using commercially available oleyl alcohol, take 50g oleyl alcohol and 36g p-toluenesulfonyl chloride, the molar ratio of the two is 1:1, and react at -20°C for 15 hours in the presence of 10 times the molar amount of triethylamine. After washing with water and drying, the p-toluenesulfonate of oleyl alcohol is obtained. 80 g of anhydrous lithium bromide was added in a 5-fold molar amount, and acetone was added at the same time, and the reaction was carried out at room temperature for 2 hours. Acetone was evaporated to dryness, petroleum ether was added, and after standing at -5°C, 1-bromo-cis-9-octadecene was obtained by filtration, solvent removal, and column chromatography with a yield of 21.5%.

[0068] Quaternization:

[0069] 1-Bromo-cis-9-octadecene (40g, 0.12mol), N,N,N',N'-tetramethylethylenediamine (5g, 0.04mol), the molar ratio of the two is 3: 1. Add 150mL of anhydrous acetonitrile into a 500mL single-necked...

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Abstract

The invention relates to a preparation method of a low-concentration viscoelastic surfactant solution. The structure of an active ingredient is shown in the specifications. The preparation method of the surfactant solution comprises the following steps of: synthesizing an oleic acid-based Gemini quaternary ammonium salt surfactant in the ratio 18:(1-2)-18:1; performing ion exchange; neutralizing with acid and alkali; and compounding. The surfactant solution is characterized in that: the surfactant solution shows higher viscoelasticity at an extremely low concentration, and can be applied to oil field fracturing fluids, drag reduction agents and daily detergent formulas. The invention contributes to facilitating the application of oleic acid to a surfactant viscoelastic system.

Description

technical field [0001] The invention relates to a viscoelastic surfactant solution, in particular to a low-concentration viscoelastic surfactant solution using natural product oleic acid as a raw material and a preparation method thereof. Background technique [0002] Surfactant viscoelastic solutions are widely used in daily life and industrial production, such as fracturing fluid for oil recovery in oil fields, drag reducer and daily cleaning agent formulations, etc. A common surfactant viscoelastic solution can be obtained by adding a large amount of inorganic or organic salts to a single-headed, single-tailed surfactant solution. This kind of system usually requires a high concentration of surfactant, which increases the cost on the one hand, and causes unnecessary pollution to the system on the other hand, increasing the difficulty of post-processing. [0003] The viscoelasticity of the surfactant solution is related to the molecular structure of the surfactant, the ty...

Claims

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Application Information

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IPC IPC(8): B01F17/18C07C211/63C07C209/12C09K23/18
Inventor 宋湛谦宋冰蕾商士斌饶小平
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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