Method for synthesizing water-soluble imidazoline quaternary ammonium salt corrosion inhibitor

A technology of water-soluble imidazoline and quaternary ammonium salt, which is applied in the preparation of water-soluble imidazoline quaternary ammonium salt corrosion inhibitor and the field of quaternization of imidazoline, which can solve the problems of unfriendly environment, strong toxicity, and great harm to production personnel. question

Active Publication Date: 2014-02-05
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are many reports on the synthesis of imidazoline quaternary ammonium salts at home and abroad. During quaternization, benzyl chloride or dimethyl sulfate are mostly used as quaternization reagents. These two reagents are highly toxic and volatile, which is harmful to production personnel. Harmful, not friendly to the environment

Method used

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  • Method for synthesizing water-soluble imidazoline quaternary ammonium salt corrosion inhibitor
  • Method for synthesizing water-soluble imidazoline quaternary ammonium salt corrosion inhibitor
  • Method for synthesizing water-soluble imidazoline quaternary ammonium salt corrosion inhibitor

Examples

Experimental program
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Effect test

Embodiment 1

[0027] step one

[0028] Under the protection of nitrogen, add oleic acid and diethylenetriamine accurately in sequence to the reactor with thermometer, stirrer, condenser and water separator, the molar ratio is 1:1.1, and add dry 50g of xylene as a solvent, after adding the solvent, reflux at 120°C for 2.5h to separate the water generated by the amidation reaction; then gradually raise the temperature to 210°C, keep it warm for 1h, evaporate the solvent and unreacted amine; then raise the temperature Heat the reaction at 240°C for 3 hours, steam the water generated by the cyclization reaction; finally cool the reactant to obtain imidazoline.

[0029] step two

[0030] Add the imidazoline synthesized in step 1 to the reactor with a thermometer, agitator, and condenser tube, and use 50 g of ethanol as a solvent, turn on the mechanical stirring, and add dimethyl phosphite dropwise into the reactor at 50° C., wherein The reactants are imidazoline and dimethyl phosphite, the rea...

Embodiment 2

[0032] Add the imidazoline synthesized in Step 1 of Example 1 into the reactor with a thermometer, agitator, and condenser tube, and use 50 g of ethanol as a solvent, turn on the mechanical stirring, and add dimethyl phosphite dropwise to the reactor at 50°C Among them, the reactants are imidazoline and dimethyl phosphite, and the reaction molar ratio is 1:0.75. At this temperature, stir and react for 1 h, and cool to obtain a reddish-brown imidazoline quaternary ammonium salt corrosion inhibitor.

Embodiment 3

[0034] Add the imidazoline synthesized in Step 1 of Example 1 into the reactor with a thermometer, agitator, and condenser tube, and use 50 g of ethanol as a solvent, turn on the mechanical stirring, and add dimethyl phosphite dropwise to the reactor at 50°C Among them, the reactants are imidazoline and dimethyl phosphite, and the reaction molar ratio is 1:1.0. At this temperature, stir and react for 1 h, and cool to obtain a reddish-brown imidazoline quaternary ammonium salt corrosion inhibitor.

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Abstract

The invention discloses a method for synthesizing a water-soluble imidazoline quaternary ammonium salt corrosion inhibitor. The method is characterized by comprising the following steps of performing amidation reaction on reaction raw materials organic acid and organic amine to synthesize amide, performing amide cyclization reaction to obtain imidazolidine, and quaternizing the oil-soluble imidazolidine by using a quaternizing agent such as dimethyl phosphite to synthesize the water-soluble imidazoline quaternary ammonium salt corrosion inhibitor. Evaluation tests show that an obtained product is high in water solubility and corrosion inhibition rate.

Description

technical field [0001] The invention relates to the technical field of industrial water treatment agents, in particular to a preparation method of a water-soluble imidazoline quaternary ammonium salt corrosion inhibitor, in particular to a quaternization method of imidazoline. Background technique [0002] Imidazoline quaternary ammonium salt corrosion inhibitor is widely used in the field of water treatment corrosion inhibitors, mainly used as oilfield corrosion inhibitors, fungicides, and pickling corrosion inhibitors. At present, there are many reports on the synthesis of imidazoline quaternary ammonium salts at home and abroad. During quaternization, benzyl chloride or dimethyl sulfate are mostly used as quaternization reagents. These two reagents are highly toxic and volatile, which is harmful to production personnel. Harmful, not friendly to the environment. Therefore, selecting a low-toxic quaternizing agent to synthesize a new type of water-soluble imidazoline quate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D233/16C07F9/11C07F9/142
CPCC07D233/06C07D233/16C07F9/11C07F9/142
Inventor 王素芳李志元林蓓王腾滕厚开张艳芳
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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