Preparation and application of double long-chain alkyls-containing sulphonate type anionic surfactant

A surfactant and long-chain alkyl technology, applied in the field of colloid and interfacial chemistry, can solve the problem of low interfacial tension between crude oil and water, and achieve excellent lipophilicity, excellent chemical stability, surface activity, and small adsorption loss.

Active Publication Date: 2017-12-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, under the condition of no alkali or weak alkali, commonly used surfactants in ASP flooding such as petroleum sulfonate, heavy alkylbenzene sulfonate, natural carboxylate, petroleum carboxylate and lignosulfonate It is difficult to reduce the interfacial tension of crude oil / water to ultra-low, so it is necessary to develop new surfactants

Method used

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  • Preparation and application of double long-chain alkyls-containing sulphonate type anionic surfactant
  • Preparation and application of double long-chain alkyls-containing sulphonate type anionic surfactant
  • Preparation and application of double long-chain alkyls-containing sulphonate type anionic surfactant

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Preparation of intermediate (I) containing didodecanyl

[0031]Add 0.25mol didodecanyl glyceryl ether and 0.35mol solid KOH into a 500mL three-necked flask, dissolve in 200mL n-hexane, and add 0.005mol TBAB as a catalyst. Then, 0.25mol epichlorohydrin was added dropwise at 30°C, and reacted at 50°C for 6 hours after the dropwise addition was completed. After the reaction was completed, the product was naturally cooled to room temperature, the inorganic salt was removed by vacuum filtration, and the solvent was removed by rotary evaporation to obtain the intermediate (I). The yield is about 85%.

Embodiment 2

[0033] Preparation and Characterization of Dilauryl Ether Hydroxypropyl Sulfonate (II)

[0034] Add 0.1 mol of sodium bisulfite to a 250 mL three-necked flask, dissolve it in 100 mL of water, and then slowly add 0.1 mol of the intermediate (I) obtained above at 75° C. Raise the temperature to the reflux temperature (100±2° C.), and continue the reaction for 48 hours. After the reaction was finished, the moisture was evaporated, the reaction product was cooled to room temperature, dissolved in 400mL of ethyl acetate, filtered to remove salt, and the solvent was removed in vacuo to obtain the crude product of sodium didodecylglyceryl ether hydroxypropyl sulfonate. The rate is about 80%. Dissolve the crude product in 100 mL of isopropanol / water (volume ratio 1:1) mixed solvent, extract with petroleum ether several times, remove the unreacted intermediate (I), and remove the solvent by rotary evaporation to obtain the purified dioctol Sodium Alkyl Glyceryl Ether Hydroxypropyl Su...

Embodiment 3

[0039] The synthesized sodium dialkyl glyceryl ether hydroxypropyl sulfonate was dissolved in pure water to prepare aqueous solutions of different concentrations, and the surface tension of the solution was measured by the suspension ring method at 25°C, and the relationship curve of the surface tension with the concentration was drawn, and the results were Such as image 3 shown. As can be seen from the figure, the critical micelle concentration (cmc) of dioctadecyl, didecyl and didodecyl glyceryl ether hydroxypropyl sulfonate sodium is 1.1×10 respectively. -4 mol / L,6.6×10 -6 mol / L, and 7.3×10 -6 mol / L, while the γ of the three sulfonates cmc Very low and basically the same, around 25mN / m. It shows that this series of surfactants has excellent surface activity.

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Abstract

The invention relates to preparation and application of a double long-chain alkyls-containing sulphonate type anionic surfactant and belongs to the field of colloidal and interfacial chemistry. The surfactant is derived from a renewable raw material, has very good interface activity, and is particularly suitable for reducing crude oil/water interface tension. When an aqueous solution contains weak base Na2CO3 with the mass fraction being 0.5 percent, the surfactant can reduce Daqing crude oil/formation water interface tension to be ultralow in the total surfactant concentration range of 0.1 mM to 10 mM by compounding with a plurality of conventional surfactants. A formula which takes the surfactant as a main surfactant also has excellent oil sand adsorption resistance; when the initial total concentration is 10 mM, ultralow surface tension can still be obtained after the surfactant is added into Daqing oil sand for adsorbing for 11 times continuously in the solid/liquid mass fraction ratio being 0.1/0.9. The surfactant is an excellent weak base-surfactant-polymer compound driven surfactant.

Description

technical field [0001] The preparation and application of a kind of double-long-chain alkyl-containing sulfonate anionic surfactant belongs to the technical field of colloid and interface chemistry. Background technique [0002] Petroleum is an important non-renewable resource. However, my country's dependence on foreign oil has exceeded 60%. Therefore, further increasing domestic crude oil production and reducing foreign dependence are related to my country's national defense security and national economy and people's livelihood. [0003] With the advancement of technology, onshore oil reservoirs have basically been discovered, so it is becoming more and more difficult to increase crude oil production by discovering new oil fields. But on the other hand, only 30% to 40% of the underground crude oil reserves have been extracted from the developed oil fields, which means that 60% to 70% of the crude oil remains underground. Since the residual oil is trapped in the pores of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/32C07C309/10C09K8/584E21B43/22
CPCC07C309/10C09K8/584E21B43/16
Inventor 崔正刚颜利民将建中宋冰蕾裴晓梅
Owner JIANGNAN UNIV
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