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Gemini surfactant and preparation method thereof

A technology of gemini surface and active agent, applied in the field of gemini surfactant and its preparation, anionic gemini surfactant and its preparation field, can solve the problems of difficulty, low yield, complex synthesis steps, etc., achieves easy operation and improved conversion High efficiency, easy purification effect

Inactive Publication Date: 2011-04-27
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis steps of most anionic gemini surfactants are relatively complicated and the yield is low, which makes it difficult for them to enter the oil flooding application field on a large scale.

Method used

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  • Gemini surfactant and preparation method thereof
  • Gemini surfactant and preparation method thereof
  • Gemini surfactant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1、1

[0059] The preparation of embodiment 1, 1,8-dioctylmethoxy-3,6-dioxa-1,8-tetracosane sodium disulfate (S-8-1-8)

[0060] (1) Preparation of n-octyl glycidyl ether (E-8)

[0061] Put a 250mL three-necked flask equipped with a thermometer and a constant pressure dropping funnel into a constant temperature magnetic stirring water bath, add 104.0g n-octanol, 48.0g sodium hydroxide, and 9.1g benzyltriethylammonium chloride into the flask, Stir and mix evenly at 30°C, slowly add 111g of epichlorohydrin (wherein the molar ratio of n-octanol, epichlorohydrin, sodium hydroxide and benzyltriethylammonium chloride is 1: 1.5: 1.35: 0.05 ), and keep warm for about 3 hours after the completion of the dropwise addition. After the reaction is completed, the product is suction filtered to remove sodium hydroxide and benzyltriethylammonium chloride, and then washed with water several times to combine the organic phase, and decompress at 0.005MPa and 95°C Water and unreacted epichlorohydrin wer...

Embodiment 2、1

[0066] Example 2, Preparation of 1,14-dioctylmethoxy-3,6,9-trioxa-1,14-sodium octadecanedisulfate (S-8-3-8)

[0067] (1) Preparation of n-octyl glycidyl ether (E-8)

[0068] The experimental procedure is the same as the preparation of (1) E-8 in Example 1; wherein, the basic compound used is potassium hydroxide, and the phase transfer catalyst is dodecyltrimethylammonium chloride, n-octanol, epichlorohydrin The molar ratio of potassium hydroxide and dodecyltrimethylammonium chloride is 1: 1.1: 1.1: 0.04, the reaction temperature is 35° C., and the reaction time is 4 hours.

[0069] (2) Preparation of 1,14-dioctylmethoxy-3,6,9-trioxa-1,14-octadecanediol (O-8-3-8)

[0070] Method is the same as the preparation of (2) O-8-1-8 in embodiment 1, triethylene glycol is replaced the ethylene glycol in the embodiment 1, wherein, E-8, triethylene glycol and potassium The molar ratio is still 1: 2: 0.1; its structural formula is as shown in formula (III), wherein, R is n-octyl, n is 1, ...

Embodiment 3、1

[0073] Embodiment 3, 1,8-two (dodecyl) methoxy-3, 6-dioxa-1, the preparation of 8-tridocosane sodium disulfate (S-12-1-12)

[0074] (1) Preparation of n-dodecyl glycidyl ether (E-12)

[0075] Method is with the preparation of (1) E-8 among the embodiment 1; Wherein, used fatty alcohol is n-dodecyl alcohol, and basic compound used is potassium hydroxide, and phase-transfer catalyst is tetrabutylammonium bromide, n-dodecyl alcohol The mol ratio of epichlorohydrin, potassium hydroxide and tetrabutylammonium bromide is 1: 1.1: 1.1: 0.04, and reaction temperature is 40 ℃, and the reaction time is 5 hours; Measure product epoxy value 6.06, theoretical ring The oxygen value is 6.58, and the product yield is 92%.

[0076] (2) Preparation of 1,8-bis(dodecyl)methoxy-3,6-dioxa-1,8-docosanediol (O-12-1-12)

[0077] Method is the same as the preparation of (2) O-8-1-8 in Example 1, E-12 is substituted for E-8 in Example 1, wherein, the mol ratio of E-12, ethylene glycol and potassium is ...

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Abstract

The invention discloses a Gemini surfactant and a preparation method thereof. The structure of the Gemini surfactant is as shown in formula (I), wherein R is a C8-C16 alkyl group, and n is a natural number ranging from 1 to 3. The preparation method of the cationic Gemini surfactant as shown in formula (I) comprises the following steps: 1) reacting C8-C16 fatty alcohol with epoxy chloropropane in the presence of a basic compound and a phase transfer catalyst to generate a compound as shown in formula (II), wherein R is as defined in formula (1); 2) reacting the compound as shown in formula (II) with polyethylene glycol in the presence of alkali metal, and acidifying to obtain a compound as shown in formula (III), wherein the polymerization degree of the polyethylene glycol is 1-3; and 3) reacting the compound as shown in formula (III) with chlorosulfonic acid, and alkalifying to obtain the Gemini surfactant as shown in formula (I). The surfactant provided by the invention has stronger temperature tolerance, salt resistance, foamability and emulsibility, and can achieve a favorable synergic effect when being used with surfactants of other types.

Description

technical field [0001] The invention relates to a surfactant and a preparation method thereof, in particular to a gemini surfactant and a preparation method thereof, in particular to an anionic gemini surfactant and a preparation method thereof. Background technique [0002] Surfactants are widely used in the field of chemical enhanced oil recovery because they can greatly reduce the interfacial tension of oil and water. As a new type of high-performance surfactant, gemini surfactant can reduce the electrostatic repulsion between hydrophilic groups due to the linking group in the structure of this type of surfactant, so that the active components of the surfactant are in close contact but not Destroying the hydrophilic characteristics of the hydrophilic group; and because the molecule has two or more hydrophilic groups and hydrophobic groups, this type of surfactant has extremely strong micellization ability and surface / interface activity, and some structures It has been co...

Claims

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Application Information

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IPC IPC(8): B01F17/04B01F17/42C07C305/10C07C303/24C09K23/04C09K23/42
Inventor 柳建新郭拥军吕鑫张健
Owner CHINA NAT OFFSHORE OIL CORP
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