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Dicarboxyl long-chain viscoelastic surfactant as well as preparation method and application thereof

A surfactant and viscoelastic technology, which is applied in the field of dicarboxy long-chain viscoelastic surfactant and its preparation, can solve problems such as safety hazards and explosions, and achieve improved recovery, simple preparation process, and low cost of raw materials Effect

Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chlorosulfonic acid in the raw material has strong hygroscopicity, and it is easy to cause an explosion when it contacts with water, and it is easy to cause a safety hazard in the preparation process

Method used

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  • Dicarboxyl long-chain viscoelastic surfactant as well as preparation method and application thereof
  • Dicarboxyl long-chain viscoelastic surfactant as well as preparation method and application thereof
  • Dicarboxyl long-chain viscoelastic surfactant as well as preparation method and application thereof

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preparation example Construction

[0027] According to the second aspect of the present invention, the present invention provides the preparation method of the dicarboxy long-chain viscoelastic surfactant described in the first aspect of the present invention, the preparation method comprising:

[0028] In the presence of an emulsifier, alkyl diol and alkenyl succinic anhydride undergo a synthesis reaction to obtain a reaction product, and the reaction product is demulsified by a demulsifier, suction filtered, washed, dried and extracted to obtain a dicarboxy long-chain viscoelastic surface active agent.

[0029] Preferably, the molecular structural formula of the alkyl glycol is:

[0030]

[0031] Wherein, n=1-8 natural numbers, preferably 1-4 natural numbers, more preferably 1-2 natural numbers;

[0032] Preferably, the molecular structural formula of described alkenyl succinic anhydride is:

[0033]

[0034] where R 1 for C 4-10 alkyl or alkenyl, preferably C 5-8 Alkyl or C 5-7 alkenyl, more pref...

Embodiment 1

[0059] A double carboxyl long-chain viscoelastic surfactant, the surfactant structural formula is:

[0060]

[0061] Among them, n=2;

[0062] R 1 is n-butane, R 2 For isobutane. .

[0063] A preparation method of a double carboxyl long-chain viscoelastic surfactant, comprising the following steps:

[0064] (1) in reaction vessel (such as there-necked flask), add N-dodecyl dimethylamine 2mol and mix with alkenyl succinic anhydride (ASA) 1mol, make the emulsion of ASA;

[0065] (2) slowly add 2mol alkyl glycol solution into the emulsion with a constant pressure dropping funnel at a speed of 1 drop / s, and react for 3h under the conditions of a stirring speed of 100rpm and a reaction temperature of 65°C to obtain a reaction product;

[0066] (3) demulsification with ethanol after completion of the reaction, suction filtration, washing, and drying at 85°C to obtain a crude product;

[0067] (4) The crude product is extracted and dried in vacuum at 90° C. to obtain a doubl...

Embodiment 2

[0076] A double carboxyl long-chain viscoelastic surfactant, the surfactant structural formula is:

[0077]

[0078] Among them, n=4, R 1 is n-pentyl, R 2 Isopentyl.

[0079] A preparation method of a double carboxyl long-chain viscoelastic surfactant, comprising:

[0080] (1) in reaction vessel (such as there-necked flask), add quaternary ammonium salt 3mol and mix with alkenyl succinic anhydride (ASA) 1mol, make the emulsion of ASA;

[0081] (2) slowly add 2.01mol alkyl glycol solution into the emulsion with a constant pressure dropping funnel at a speed of 2 drops / s, and react for 4h under the conditions of a stirring speed of 150rpm and a reaction temperature of 75°C to obtain a reaction product;

[0082] (3) demulsification with ethanol after completion of the reaction, suction filtration, washing, and drying at 80° C. to obtain a crude product;

[0083] (4) The crude product is extracted and dried in vacuum at 100° C. to obtain a double carboxyl long-chain viscoel...

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Abstract

The invention relates to the field of tertiary oil recovery, in particular to a dicarboxyl long-chain viscoelastic surfactant, a preparation method thereof and application of the dicarboxyl long-chain viscoelastic surfactant as an oil-displacing agent. The preparation method comprises the following steps: in the presence of an emulsifier, alkyl glycol and alkenyl succinic anhydride are subjected to a synthetic reaction to obtain a reaction product, and the reaction product is demulsified by a demulsifier, subjected to suction filtration, washed, dried and extracted to obtain the dicarboxyl long-chain viscoelastic surfactant. The reaction activity of alkenyl succinic anhydride is very high, the alkenyl succinic anhydride can easily react with hydroxyl, and the generated substance has a dicarboxyl long-chain carbon structure. The effect of a long-chain carbon surfactant can be achieved. The preparation process is simple, the raw material cost is low, and meanwhile, the recovery rate is increased by 10% or above through an indoor physical simulation experiment.

Description

technical field [0001] The invention relates to the field of tertiary oil recovery, in particular to a dicarboxyl long-chain viscoelastic surfactant, a preparation method thereof, and an application as an oil-displacing agent. Background technique [0002] Surfactant refers to a substance that can significantly change the interface state of the solution system by adding a small amount. It has a fixed hydrophilic and lipophilic group, and can be aligned on the surface of the solution. The molecular structure of surfactants is amphoteric: one end is a hydrophilic group, the other end is a hydrophobic group; the hydrophilic group is often a polar group, such as carboxylic acid, sulfonic acid, sulfuric acid, amino or amine group and its salts , hydroxyl, amide group, ether bond, etc. can also be used as polar hydrophilic groups; while hydrophobic groups are often non-polar hydrocarbon chains, such as hydrocarbon chains with more than 8 carbon atoms. Surfactants are divided int...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/593C09K8/584
CPCC07C67/08C07C69/593C09K8/584
Inventor 钱钦田玉芹张峰咸国旗张冬会李福军徐山衣哲韦雪曲萍萍
Owner CHINA PETROLEUM & CHEM CORP