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Gemini cationic surfactant and preparation method thereof

A technology of surfactant and gemini surface, applied in the field of cationic surfactant and its preparation, to achieve the effect of improving surface activity

Inactive Publication Date: 2012-02-15
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing template agent for the synthesis of MFI - amine monocation cationic surfactant has been difficult to make a breakthrough in this area, the goal turned to the research of another type of surfactant - gemini cationic surfactant

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Dissolve 5g of 1-bromooctadecane and 15g of N,N,N',N'-tetramethyl-1,6-hexanediamine in 100ml of acetonitrile and toluene mixture (volume ratio 1:1), heat at 70°C 10h, the following quaternization reaction occurs, that is, two quaternary ammonium salt groups are introduced in the long-chain brominated alkanes:

[0042]

[0043] Cool to room temperature, filter, wash with ether, and dry under vacuum at 50°C. to get the intermediate product C 18 h 36 Br-N(CH 3 ) 2 -C 6 h 12 - HN(CH 3 )2 , The yield is 40%.

[0044] The above-mentioned quaternization reaction is a key point and a difficult point in the preparation of the gemini surfactant, and the reaction is difficult to carry out, resulting in a lower yield. Therefore, it is very important to adjust the process parameters such as reaction temperature, reaction time and raw material ratio. The following is a set of experimental data under the condition that the reaction time is 10h and the ratio of raw material...

Embodiment 2

[0048] Dissolve 10g of 1-bromooctadecane and 15g of N,N,N',N'-tetramethyl-1,6-hexanediamine in 85ml of acetonitrile and toluene mixture (volume ratio 1:1.5), heat at 90°C for 8h ,reaction

[0049]

[0050] Cool to room temperature, filter, wash with ether, and dry under vacuum at 50°C. Gemini surfactant intermediate C is obtained 18 h 36 Br-N(CH 3 ) 2 -C 6 h 12 - HN(CH 3 ) 2 , The yield is 38%.

[0051] The following is a set of experimental data under the condition that the reaction temperature is 90°C and the ratio of raw materials is 1:10:

[0052] Table 2. C at different reaction times 18 h 36 Br-N(CH 3 ) 2 -C 6 h 12 - HN(CH 3 ) 2 Yield of

[0053]

Embodiment 3

[0055] Dissolve 10g of 1-bromooctadecane and 15g of N,N,N',N'-tetramethyl-1,6-hexanediamine in 106ml of acetonitrile and toluene mixture (volume ratio 1:1.3), heat at 80°C for 10h ,reaction

[0056]

[0057] Cool to room temperature, filter, wash with ether, and dry under vacuum at 50°C. Gemini surfactant intermediate C is obtained 18 h 36 Br-N(CH 3 ) 2 -C 6 h 12 - HN(CH 3 ) 2 , with a yield of 45%.

[0058] The following is a set of experimental data under the condition that the reaction temperature is 90°C and the reaction time is 10h:

[0059] Table 3 C under different raw material ratios 18 h 36 Br-N(CH 3 ) 2 -C 6 h 12 - HN(CH 3 ) 2 Yield of

[0060] Raw material ratio (molar ratio) Theoretical yield / g Actual output / g Yield / % 1:2 5.091 1.905 21.51 1:5 5.093 2.268 44.53 1:10 5.071 1.895 37.37 1:15 5.086 1.444 28.39 1:20 5.090 1.024 20.12

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Abstract

The invention discloses a gemini cationic surfactant and a preparation method thereof. The method is as follows: after a quaternization reaction and an alkylation addition reaction, two electropositive hydrophilic groups and two asymmetric hydrophobic chains are respectively introduced on both sides of a long-chain aliphatic hydrocarbon to prepare the gemini cationic surfactant of which structural formula is shown as below. The prepared gemini cationic surfactant can be used as the template agent to synthesize primitive cell nano-layer MFI nanometer thin-layer zeolite of which the thickness is only 2nm, the zeolite can be used to increase the activity and selectivity of the catalytic reaction; and the chemical bonding in a polar head group area inhibits a separation force between the original head groups of the single-chain single-head group surfactant, which is an important breakthrough for the increase of the surface activity and is also a new way for practical applications. By revealing the relation between the new molecular structure and the self-organizing behavior, the amphiphilic molecule self-organizing mechanism can be understood deeply.

Description

technical field [0001] The present invention relates to a kind of cationic surfactant and its preparation method, specifically, a kind of Gemini cationic surfactant containing quaternary ammonium ion and its preparation method. technical background [0002] Molecular sieves with MFI-type pore structure (the unit cell composition is︱Na n + (H 2 O) 16 ︱[Al n Si 96-n o 192 ] n < 27, n is the number of atoms of aluminum in the unit cell) is one of the most important catalytic materials, widely used in petrochemical, coal chemical and fine chemical and other catalytic fields. The existing templating agent of synthesizing MFI type molecular sieve is the amine monogram cationic surfactant represented by tetrapropyl ammonium bromide: [0003] [0004] There are also such as tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetraethylammonium bromide, diethylamine, ammonia water, n-butylamine, pyridine and the like. Such surfactants generally consist of two p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/63C07C209/12B01F17/18C09K23/18
Inventor 李哲何凯李振赵志军
Owner TAIYUAN UNIV OF TECH
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