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Multifunctional corrosion inhibitor and preparing method

A corrosion inhibitor, multi-functional technology, applied in the field of multi-functional corrosion inhibitor, can solve the problems of lack of protection, foaming oil quality, increase loss, etc., to achieve excellent corrosion inhibition performance, low water solubility, dehydration fast effect

Inactive Publication Date: 2005-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the concentration of some corrosion inhibitors is lower than a certain value, there will be no protective effect; when the dosage is large, most film-forming amine corrosion inhibitors have certain surface activity, which will cause oil emulsification, foaming, etc. Substandard quality and increased losses

Method used

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  • Multifunctional corrosion inhibitor and preparing method
  • Multifunctional corrosion inhibitor and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] 1. Propylene oxide (PO), ethylene oxide (EO) block copolyether

[0011] In a 500ml autoclave equipped with an electric stirrer, add 23.0g of diethylenetriamine, and 80ml of mixed xylene, and add 0.2g of potassium hydroxide as a catalyst. Under heating and stirring, 70.0g of PO and 15.0g of EO are sequentially introduced to react The temperature range is 120-140°C. After the absorption is complete, the xylene is distilled off under reduced pressure to obtain the desired polyether.

[0012] 2. Corrosion inhibitor synthesis

[0013] Add 41.0 g of polyether and 220 ml of absolute ethanol to a 500 ml three-neck flask with stirring, thermometer, and condenser. Carefully add 36.0g of sodium bromoethylsulfonate in three batches, the reaction temperature is 60°C, after the addition, reflux for 2.5 hours to remove the white solid in the solution by hot filtration, and then distill off the ethanol in the filtrate to obtain the finished product.

[0014] Corrosion inhibitor simu...

Embodiment 2

[0018] 1. Propylene oxide (PO), ethylene oxide (EO) block copolyether

[0019] In a 500ml autoclave equipped with an electric stirrer, add 23.0g triethylenetetramine, and 80ml mixed xylene, add 0.2g sodium hydroxide as a catalyst, and under heating and stirring, 70.0gPO and 15.0gEO are sequentially introduced to react The temperature range is 120-140°C. After the absorption is complete, the xylene is distilled off under reduced pressure to obtain the desired polyether.

[0020] 2. Corrosion inhibitor synthesis

[0021] Add 40.0g of polyether and 200ml of 1,2-dichloroethane to a 500ml three-neck flask with stirring, thermometer, and condenser, heat to 50°C, and slowly add 21.0g of 1,3-propylene sulfinic acid lactone dropwise (Dropping time is about 50 minutes), this reaction is an exothermic reaction, and external cooling measures should be taken, and the reaction temperature is 40°C. After the dropwise addition, the reactant was refluxed for about 2.5 hours to complete the ...

Embodiment 3

[0026] In a 500ml autoclave equipped with an electric stirrer, add 23.0g of ethylenediamine and 80ml of mixed xylene, add 0.2g of sodium hydroxide as a catalyst, and under the condition of heating and stirring, successively feed 70.0gPO and 15.0gEO, the reaction temperature Range 120-140°C. After the absorption is complete, the xylene is distilled off under reduced pressure to obtain the desired polyether.

[0027] Corrosion inhibitor synthesis

[0028] Add 40.0g of polyether and 200ml of 1,2-dichloroethane to a 500ml three-neck flask with stirring, thermometer, and condenser, heat to 50°C, and slowly add 21.0g of 1,3-propylene sulfinic acid lactone dropwise (Dropping time is about 50 minutes), this reaction is an exothermic reaction, and external cooling measures should be taken. After the dropwise addition, the reactant was refluxed for about 2.5 hours to complete the reaction. Remove the solvent under reduced pressure and cool the unreacted matter to room temperature, ad...

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Abstract

This invention relates to a multi-functional corrosion-inhibitor used in parts of atmospheric vacuum tower top tube, and its prepn. method. The characteristic of the molecular structure of the inhibitor is that it is of betaine sulfonate type, being of amphoteric ion, having excellent corrosion inhibiting property. In this polymer, triethenyl teraamine is used as initiator, and introducing epoxy propane and epoxy ethane block polyether (excellent demulsification agent) having advantages of coalescence, quick de-water rate, the removed water being clear, less dosage, broad pH value range.

Description

technical field [0001] The invention relates to a multifunctional corrosion inhibitor used for anticorrosion of atmospheric and vacuum tower top pipe parts in oil refineries and a preparation method thereof. Background technique [0002] The heavy oil catalytic cracking process in the refinery requires that the sodium ion content in the catalytic cracking raw oil be less than 1ppm. Therefore, the anti-corrosion measures of atmospheric and vacuum distillation and caustic injection after crude oil desalting have been cancelled. Therefore, the HCl-H in the evaporating condensing system of the atmospheric and vacuum column top volatile line vacuum column 2 O-H 2 S-O 2 -H 2 The corrosion of O corrosive media to process equipment pipelines is intensified. At present, the injection of film-forming amine corrosion inhibitors is widely used to slow down the corrosion of the initial setting area, the inner wall of the tower and internal components. The use of corrosion inhibitors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/16C23F11/173
Inventor 杜建卫刘键
Owner PETROCHINA CO LTD
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