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Synthetic method of gemini quaternary ammonium salt surfactant and application as drag reduction agent

A technology of surfactants and quaternary ammonium salts, applied in chemical instruments and methods, transportation and packaging, descaling and water softening, etc., can solve problems such as narrow applicable temperature range, strong corrosion, and large irritation, and achieve biological High safety, good drag reduction performance, overcoming strong corrosion effect

Inactive Publication Date: 2011-08-17
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to design and synthesize asymmetric gemini long-chain hydrocarbon-based quaternary ammonium salt surfactants, and use it as the main molecule of drag reduction and energy-saving agent, and use organic acid corrosion inhibitors as auxiliary ions to overcome the existing quaternary ammonium salt drag reduction The disadvantages of energy-saving agent are strong corrosion, irritation and narrow applicable temperature range

Method used

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  • Synthetic method of gemini quaternary ammonium salt surfactant and application as drag reduction agent
  • Synthetic method of gemini quaternary ammonium salt surfactant and application as drag reduction agent
  • Synthetic method of gemini quaternary ammonium salt surfactant and application as drag reduction agent

Examples

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Embodiment 1

[0036] Synthesis of Gemini Quaternary Ammonium Surfactant (Gemini 1) Using Coco Dimethyl Tertiary Amine and Dibromoethane as Raw Materials

[0037] In a 1000mL four-neck reaction flask equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a reflux condenser, add 300mL absolute ethanol and 227g (1.0mol) of coco dimethyl tertiary amine, stir and dissolve, and heat to reflux temperature, 75.2g (0.4mol) of dibromoethane reagent was added dropwise within 6 hours, and the reflux was maintained for 4 hours after the addition, and the progress of the quaternary amination reaction was tracked by measuring the residual tertiary amine content in the reaction solution. When the conversion rate of tertiary amine reaches more than 75% and no longer increases, the quaternary amination reaction is stopped, and 200 mL of ethanol solvent is recovered by vacuum evaporation to obtain a white viscous substance. Dissolve the distilled product with 500 mL of deionized water, then...

Embodiment 2

[0039] Synthesis of Gemini Quaternary Ammonium Surfactant (Gemini 2) Using Coconut Dihydroxyethylamine as Raw Material

[0040] In a 1000mL four-neck reaction flask equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a reflux condenser, add 300mL of absolute ethanol and 287g (1.0mol) of coco-dihydroxyethyl tertiary amine, stir to dissolve, and heat to At the reflux temperature, 75.2 g (0.4 mol) of dibromoethane reagent was added dropwise within 6 hours. After the addition, the reflux was continued for 4 hours. The quaternary amination reaction progress was tracked by measuring the residual tertiary amine content in the reaction solution. When the conversion rate of the tertiary amine reaches more than 75% and no longer increases, the reaction is stopped, and 200 mL of ethanol solvent is recovered by vacuum evaporation to obtain a white viscous substance. Dissolve the distilled product with 500 mL of deionized water, then transfer it into a reaction flask,...

Embodiment 3

[0042] Synthesis of Gemini Quaternary Ammonium Surfactant (Gemini 3) Using Coco-Dihydroxyethylamine and Epichlorohydrin as Raw Materials

[0043] In a 1000mL four-necked reaction flask equipped with a mechanical stirrer, a thermometer, a dropping funnel and a reflux condenser, add 300mL of absolute ethanol, add 287g (1.0mol) of coco-dihydroxyethyl tertiary amine and 48.7g of 30% hydrochloric acid. g (0.4mol), stir and dissolve, heat to reflux temperature, add epichlorohydrin reagent 37.0g (0.4mol) dropwise within 6 hours, keep refluxing for 4 hours after adding, measure the residual tertiary amine content in the reaction solution to track the progress of the quaternary amination reaction. When the conversion rate of the tertiary amine reaches more than 75% and no longer increases, the reaction is stopped, and 200 mL of ethanol solvent is recovered by vacuum evaporation to obtain a white viscous substance. Dissolve the distillation product with 300 mL of deionized water, then ...

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Abstract

The invention discloses a method for synthesizing gemini long chain alkyl quaternary ammonium salts by enabling long chain alkyl tertiary amine mixture to be reacted with dibromo hydrocarbon or epoxy chloropropane and an application as a drag reduction and energy conservation agent of a circulating water system. The method comprises the following steps: stirring and dissolving the long chain alkyl tertiary amine mixture in an organic solvent, and heating to reflux temperature; slowly adding dibromoethane or epoxy chloropropane for generating mixture of asymmetric and symmetric gemini long chain alkyl quaternary ammonium salts; stopping the reaction when the tertiary amine conversion rate is above 75%, and performing vacuum evaporation for recovering the solvent; and using deionized water to dissolve distillation products, and oxidizing the non-converted raw material to tertiary amine oxide with hydrogen peroxide at the temperature of 60-80 DEG C. A gemini quaternary ammonium salt surfactant is used as main molecules of the drag reduction agent, an organic acid corrosion inhibitor is used as auxiliary ions, the molar ratio of the main molecules to the auxiliary ions is 1: (2.4-6.0), then the drag reduction agent which is applicable to the range of 5-95 DEG C is prepared, and the drag reduction efficiency of the drag reduction agent to the circulating water system achieves 40%-70%, and the corrosion inhibition efficiency achieves 60%-95%. By adopting the gemini long chain alkyl quaternary ammonium salt surfactant, the problems of strong corrosion, great irritation and a narrow range of applicable temperature of the traditional long chain alkyl quaternary ammonium salt surfactant can be overcome.

Description

technical field [0001] The invention relates to a method for synthesizing a gemini quaternary ammonium salt surfactant and its application as a drag reducing agent, in particular to a method for synthesizing a mixture of long-chain hydrocarbyl dimethyl (or dihydroxyethyl) gemini quaternary ammonium salts and its application as circulating water The application of the pipeline drag reducing and energy saving agent belongs to the fields of fine chemical industry and environmental protection and energy saving. Background technique [0002] Building air conditioners, district central heating systems, industrial production devices and circulating water systems for oil heating and tracing pipes generally have problems of high energy consumption, among which the energy consumption of circulating pumps is as high as 30%-50% of the system energy consumption. Adding a pipeline drag reducer to the circulating water system is a simple and easy energy-saving method, which has received wi...

Claims

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Application Information

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IPC IPC(8): B01F17/18B01F17/38C02F5/14C09K23/18C09K23/38
Inventor 李建生孙宝丰何韬冯艳文刘炳光
Owner TIANJIN VOCATIONAL INST
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