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Combined surfactant with strong ability to solubilize crude oil and low-cost preparation method

A surfactant and capability technology, applied in the field of combined surfactants and low-cost preparation, can solve problems such as low interfacial activity and poor crude oil solubilization ability

Active Publication Date: 2020-10-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the surfactant used as the main component of the oil displacement agent system in the prior art has the problems of poor solubilization ability of crude oil and low interfacial activity, and a new surfactant with strong ability to solubilize crude oil is provided Combined Surfactants

Method used

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  • Combined surfactant with strong ability to solubilize crude oil and low-cost preparation method
  • Combined surfactant with strong ability to solubilize crude oil and low-cost preparation method
  • Combined surfactant with strong ability to solubilize crude oil and low-cost preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (a) Preparation of Gemini Cationic Quaternary Ammonium Salt Surfactant (10-6-10,2Cl-)

[0066] C 10 h 21 (C 2 h 5 ) 2 N + (CH 2 ) 6 N + (C 2 h 5 ) 2 C 10 h 21 .2Cl -

[0067] Mix 213.0 grams (1 mole) of decyldiethyl tertiary amine with 77.5 grams (0.5 moles) of 1,6-dichlorohexane and 600 grams of isopropanol in a 2000-milliliter vessel equipped with a mechanical stirrer, a thermometer and a reflux condenser. In the four-neck flask, be heated to reflux reaction 60 hours, stop reflux. Evaporate isopropanol, take a sample and titrate with sodium tetraphenylborate standard solution, Gemini cationic surfactant (10-6-10, 2Cl - ) content was 96.5%, and the rest of the samples were left untreated and set aside.

[0068] (b) Preparation of anionic and compound surfactant S-01

[0069]

[0070] (1) Add 276 grams (1 mole) of dodecylbenzyl alcohol and 4.6 grams of potassium hydroxide to a 2L pressure reactor equipped with a stirring device. When heated to 80-90...

Embodiment 2

[0073] (a) The cationic surfactant is dodecyltrimethylammonium bromide, a commercially available product with a content of 30%, and the solvent is water.

[0074] (b) Preparation of anionic and compound surfactant S-02

[0075] Anionic surfactant is prepared with [Example 1] (b). Cool the dodecylbenzyl alcohol polyoxyethylene (2) polyoxypropylene (10) polyoxyethylene (2) ether sodium acetate reaction solution to 40 ° C, add 175.6 grams (0.4 moles) of dodecyl trimethyl The aqueous solution of ammonium bromide was continued to be stirred at 45°C for 3 hours to obtain the required combined surfactant S-02, in terms of mass percentage, 35.14% of anion and cation surfactants, 2.16% of sodium bromide, and 0.51% of sodium glycolate , mixed alcohol (ethanol + n-propanol + isopropanol) 7.06%, water 55.13%.

Embodiment 3

[0077] (a) The cationic surfactant is dodecyl dimethyl benzyl ammonium chloride, commercially available, with a content of 45%, and the solvent is water.

[0078] (b) Preparation of anion and composite surfactant S-03

[0079]

[0080] (1) Add 262 grams (1 mole) of dodecylphenol, 4 grams of potassium hydroxide and 2.6 grams of anhydrous potassium carbonate to a pressure reactor equipped with a stirring device, and when heated to a reaction temperature of 80 to 90 ° C, open Vacuum system, dehydrate under high vacuum for 1 hour, then replace with nitrogen for 3 to 4 times, adjust the reaction temperature of the system to 150°C and slowly feed 701.8 grams (12.1 moles) of propylene oxide, control the pressure ≤ 0.50MPa, and wait for the ring to After the reaction of propylene oxide, the temperature was lowered, and 88.0 g (2.0 moles) of ethylene oxide was slowly introduced at 130° C., and the pressure was controlled to be ≤0.60 MPa. After the reaction was finished, the same po...

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Abstract

The invention relates to a combined surfactant with strong crude oil solubilizing capability and a low-cost preparation method thereof. The invention mainly overcomes the problem that a conventional surfactant used as a main component of an oil displacement agent system has poor crude oil solubilizing capability, low interfacial activity and high preparation cost caused by purification. The combined surfactant provided by the invention is prepared from a cationic surfactant as shown in a formula (I) which is described in the specification, an alkylphenol or aromatic alcohol or arylamine polyether carboxylate anionic surfactant as shown in a formula (II) which is described in the specification, short-carbon-chain alcohol and salt. In the formula (I) and the formula (II), R1 is selected from C4-C32 alkyl groups; R2 and R3 are selected from a group consisting of (CH2)dOH, (CH2)eCH3 and a substituted benzyl group; and R4 is one selected from a group consisting of (CH2)dOH, (CH2)eCH3 and CH2(CH2)fCH2. With such a technical scheme, the combined surfactant can overcome the above-mentioned problem and is applicable to tertiary oil recovery in an oil field.

Description

technical field [0001] The invention relates to a combined surfactant with strong ability to solubilize crude oil and a low-cost preparation method. Background technique [0002] As an important component of chemical flooding, surfactants can be divided into two categories, ionic and nonionic, according to their chemical composition and molecular structure. At present, the types of surfactants used in tertiary oil recovery research are mostly anionic, followed by nonionic and zwitterionic, and the least used are cationic. The patents US3927716, US4018281, and US4216097 of Mobil Petroleum Company successively reported the results of using alkaline water flooding, surfactant or alkaline water flooding, and using zwitterionic surfactants for oil flooding. The zwitterionic surfactants used are of different chain lengths Carboxylic acid or sulfonate type betaine surfactant, in simulated brine with total mineralization of 62000-160000 mg / L and calcium and magnesium ions of 1500-1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 沈之芹李应成王辉辉李斌
Owner CHINA PETROLEUM & CHEM CORP
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