Method for preparing surfactants for displacement of oil

A surfactant and oil displacement technology, applied in chemical instruments and methods, drilling compositions, dissolution, etc., can solve the problems of difficult control of sulfonation reaction process speed, uneven mixing, etc., achieve good interfacial activity, improve reaction , The effect of short production cycle

Inactive Publication Date: 2009-04-01
BEIJING UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0006] The invention overcomes the problems of difficulty in controlling the speed of the sulfonation reaction process and uneven mixing in the prior art, applies the high gravity technology to the sulfonation reaction process, adapts to the needs of rapid reaction and microscopic mixing of the sulfonation reaction, and provides a high-efficiency A method for continuously industrially preparing alkylbenzenesulfonate surfactants with short production cycle and high product quality

Method used

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  • Method for preparing surfactants for displacement of oil
  • Method for preparing surfactants for displacement of oil
  • Method for preparing surfactants for displacement of oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Alkylbenzene between C9-C22 and fuming sulfuric acid with a concentration of 20% (wt) are put into a high-gravity rotating bed reactor with a processing capacity of 3L at a mass ratio of 0.3:1, and the speed of the high-gravity machine is 700 rev / min, the rotating speed of the stirring paddle is 800 rev / min, the sulfonation temperature is 30°C, the sulfonation reaction is an instantaneous continuous reaction, and the sulfonation reaction time is 5s.

[0021] Acid separation: add 5% (wt) of water in the total amount to the mixture of alkylbenzenesulfonic acid and sulfuric acid, the temperature of acid separation is 60°C, the time of acid separation is 1h, and the upper layer of alkylbenzenesulfonic acid is separated.

[0022] Neutralization: NaOH with a concentration of 25% (wt) neutralizes the separated alkylbenzenesulfonic acid to a pH value of 8-9.

[0023] Compounding: Add 5% (wt) isopropanol to the product at 20°C.

[0024] Using the prepared alkylbenzene sulfonate...

Embodiment 2

[0028] Alkylbenzene between C9-C22 and oleum with a concentration of 50% are injected into a high-gravity rotating bed reactor with a processing capacity of 3L at a mass ratio of 0.5:1, and the speed of the high-gravity machine is 2000 rpm , the sulfonation temperature is 50°C, the sulfonation reaction is an instantaneous continuous reaction, and the sulfonation reaction time is 10s.

[0029] Acid separation: add 10% (wt) water in total to the mixture of alkylbenzenesulfonic acid and sulfuric acid, the temperature of acid separation is 70°C, the time of acid separation is 2h, and the upper layer of alkylbenzenesulfonic acid is separated.

[0030] Neutralization: NaCO with a concentration of 25% (wt) 3 Neutralize the separated alkylbenzenesulfonic acid to pH 8-9.

[0031] Compounding: at 20° C., add 15% (wt) n-butanol to the product.

[0032] Others are the same as in Example 1, and the test results are shown in Table 2.

[0033] Table 2 Interfacial tension between weak base...

Embodiment 3

[0036] Alkylbenzene between C9-C22 and oleum with a concentration of 20% are injected into a high-gravity rotating bed reactor with a processing capacity of 3L at a mass ratio of 0.8:1, and the speed of the high-gravity machine is 200 rpm , the sulfonation temperature is 60°C, the sulfonation reaction is an instantaneous continuous reaction, and the sulfonation reaction time is 15s.

[0037] Acid separation: add 20% (wt) of water to the mixture of alkylbenzenesulfonic acid and sulfuric acid, the temperature of acid separation is 70°C, the time of acid separation is 3h, and the upper layer of alkylbenzenesulfonic acid is separated.

[0038] Compounding: at 20° C., add 10% (wt) n-butanol to the product.

[0039] Others are the same as in Example 1, and the test results are shown in Table 3.

[0040] Table 3 Interfacial tension between weak base alkylbenzene sulfonate surfactant / alkali system and crude oil

[0041]

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Abstract

The invention relates to a preparation method of a surfactant used for oil displacement, belonging to the field of tertiary oil recovery. The previously researched single agent can achieve good interfacial activity only by being compounded and prepared by more than two types of surfactants, has poor field application effect, and can only carry out oil displacement under high injected alkali concentration. The invention overcomes the problems in the prior art that the speed of sulfonation reaction process is difficult to control, the mixing is uneven, and the like; applies high gravity technology into the sulfonation reaction process, meets the needs of fast response and micromixing of the sulfonation reaction, and provides a method for continuously and industrially preparing alkylbenzene sulfonate surfactant which has high efficiency, short production cycle and high product quality. The prepared alkylbenzene sulfonate is a single type surfactant used for oil displacement, and the single agent has good interfacial activity and low using concentration, and can lead the oil-water interfacial tension to be ultra-low (10<-3>mN / m order of magnitude) in wider and lower alkali concentration range.

Description

technical field [0001] The invention relates to a method for preparing oil field surfactants by adopting supergravity technology, which belongs to the field of tertiary oil recovery. Background technique [0002] Hypergravity refers to the application technology of the force on matter to study the physical and chemical changes of matter in a hypergravity environment in an environment much greater than the earth's gravitational acceleration (9.8m / s2). As a high-tech, supergravity technology has great application prospects in industry. In a hypergravity environment, the molecular diffusion and interphase transfer processes between molecules of different sizes are much faster than those under a conventional gravity field. Flow contact occurs in porous media or channels in the environment, and the huge shear force tears the liquid into liquid films, liquid filaments and droplets on the micron to nanoscale, resulting in huge and rapidly renewed phase interfaces, enabling interph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584B01F17/12C09K23/12
Inventor 田英良孙诗兵张继光
Owner BEIJING UNIV OF TECH
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