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Synthesis method of symmetrical imidazoline Gemini surfactant

A technology of surfactant and synthetic method, applied in the direction of organic chemistry, etc., can solve the problems of low cost, lengthy, low efficiency, etc., and achieve the effect of ensuring the yield

Inactive Publication Date: 2019-06-21
XUZHOU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The linking group used in this process is prepared by the reaction of diethylamine and epichlorohydrin. In fact, this makes the whole reaction more cumbersome, more lengthy, less efficient, and more expensive. It is not suitable for actual production and life.
[0006] Therefore, there is currently no synthetic method of a low-cost, high-yield Gemini surfactant

Method used

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  • Synthesis method of symmetrical imidazoline Gemini surfactant
  • Synthesis method of symmetrical imidazoline Gemini surfactant
  • Synthesis method of symmetrical imidazoline Gemini surfactant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of synthetic method of symmetrical imidazoline Gemini surfactant, comprises the following steps:

[0027] 1) Melt the fatty acid at 140°C first, add zinc powder with 15% fatty acid amount (based on the amount of substance, the same below) as a catalyst, then add xylene with 30% fatty acid amount as a water-carrying agent, at 140°C , slowly drop diethylenetriamine, wherein the ratio of the amount of fatty acid to diethylenetriamine is 1:1, and react for 2 hours;

[0028] Then raise the temperature to 190°C, react for 6 hours, and install a water separator at the same time. After the effluent quality reaches the theoretical water production value, it ends; if the theoretical water production value does not reach the theoretical water production value, use vacuum suction filtration;

[0029] Distilled under reduced pressure at 130°C to distill off excess solvent (water, xylene) to obtain an intermediate;

[0030] 2) At 85°C, add dimethyl carbonate in an equimolar a...

Embodiment 2

[0035] A kind of synthetic method of symmetrical imidazoline Gemini surfactant, comprises the following steps:

[0036] 1) First melt the fatty acid at 140°C, add zinc powder with 15% fatty acid content as a catalyst, add xylene with 30% fatty acid content as a water-carrying agent, and slowly add diethylenetriamine dropwise at 140°C, in which fatty acid The ratio of the amount of substance with diethylenetriamine is 1:1.2, and the reaction is 2 hours;

[0037] Then raise the temperature to 200°C, react for 8 hours, and install the water separator at the same time. After the effluent quality reaches the theoretical water production value, it ends; if the theoretical water production value does not reach the theoretical water production value, use vacuum suction filtration;

[0038] Distilled under reduced pressure at 140°C to distill off excess solvent (water, xylene) to obtain an intermediate;

[0039] 2) At 85°C, add dimethyl carbonate in an equimolar amount to the intermed...

Embodiment 3

[0042] A kind of synthetic method of symmetrical imidazoline Gemini surfactant, comprises the following steps:

[0043] 1) First melt the fatty acid at 140°C, add zinc powder with 15% fatty acid content as a catalyst, add xylene with 30% fatty acid content as a water-carrying agent, and slowly add diethylenetriamine dropwise at 140°C, in which fatty acid The ratio of the amount of substance with diethylenetriamine is 1:1.3, reacted for 2 hours;

[0044] Then raise the temperature to 210°C, react for 10 hours, and install a water separator at the same time. After the effluent quality reaches the theoretical water production value, it ends; if the theoretical water production value does not reach the theoretical water production value, use vacuum suction filtration;

[0045] Distilled under reduced pressure at 150°C to distill off excess solvent (water, xylene) to obtain an intermediate;

[0046] 2) At 85°C, add dimethyl carbonate in an equimolar amount to that of the intermedi...

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Abstract

The invention discloses a synthesis method of a symmetrical imidazoline Gemini surfactant. The synthesis method comprises the following steps: step 1) using fatty acid and diethylenetriamine as raw materials, xylene as a solvent and zinc powder as a catalyst, heating up to 190-210 DEG C and reacting for 6-10 h, distilling under reduced pressure at 130-150 DEG C to obtain an intermediate; step 2) adding dimethyl carbonate into the intermediate at 85 DEG C, reacting for 4-6 h, heating up to 90 DEG C, adding 1, 3-dibromopropane, reacting for 6-8 h; and step 3) cooling to 56 DEG C, adding acetone,filtering while hot to remove the zinc powder, standing for crystallization, filtering and then washing solids with acetone for several times to obtain the surfactant. The synthesis method has advantages of low cost, high yield, mild reaction conditions, and capability of stably acquiring the imidazoline Gemini surfactant.

Description

technical field [0001] The invention relates to a method for synthesizing a symmetrical imidazoline Gemini surfactant, belonging to the field of surfactants. Background technique [0002] Quaternary ammonium salt-type Gemini surfactants have attracted the attention of researchers because of their high surface activity and bactericidal properties. [0003] At present, there are reports (Zhang Guanghua, Wang Bin. Synthesis and performance research of bisimidazoline quaternary ammonium salt corrosion inhibitor [J]. Science Technology and Engineering, 2016 (29): 1-6) using fatty acids and diethylenetriamine, Use zinc particles as a catalyst, react at 140°C for 2 hours until water evaporates, then raise the temperature to 190-210°C for 6 hours, then place in a rotary evaporator and evaporate xylene at 140°C to obtain an imidazoline reaction intermediate . Then react the intermediate with dimethyl carbonate at 80-100° C. for 4-5 hours, then keep the above temperature constant, a...

Claims

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Application Information

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IPC IPC(8): C07D233/16
Inventor 王汐璆庄文昌
Owner XUZHOU INSTITUTE OF TECHNOLOGY
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