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A Refinery Distillation Tower Top Corrosion Inhibitor Against Dilute Hydrochloric Acid and Hydrogen Sulfide Corrosion

A technology of hydrogen sulfide and corrosion inhibitor, applied in the direction of preventing corrosion during distillation, can solve the problems of unfriendly environment, affecting development and application, etc., and achieve the effect of good corrosion inhibition effect, good corrosion resistance effect and low corrosion rate

Active Publication Date: 2022-05-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, compound corrosion inhibitors added with solvents, synergists, and surfactants are all environmentally unfriendly chemical products, which greatly affects their future development and application.

Method used

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  • A Refinery Distillation Tower Top Corrosion Inhibitor Against Dilute Hydrochloric Acid and Hydrogen Sulfide Corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]N-Alkylpyridine tetrafluoroborate is prepared by the following process: Add a certain amount of methyl bromide (33mmol) into a three-neck round bottom flask, install a constant pressure dropping funnel with 30mmol of pyridine and a condensing reflux with a drying tube The device, fixed on the upper end of the transducer of the ultrasonic cleaner, starts ultrasonication, drops pyridine at a rate of 10mL / min, and reacts for 5 minutes in the Ar protection ultrasonic intermittent operation mode. , The reaction was stopped after 1.8h of reaction, and a light yellow solid was obtained by filtration. Add the light yellow solid, 31.5 mmol of sodium tetrafluoroborate (NaBF4) and 54 mmol of acetone into a single-necked round-bottomed flask with a condensing reflux device, and react with magnetic stirring for 11 hours at room temperature, then filter to remove the white precipitate NaBr, and add 20 mL of NaBr to the filtrate Dichloromethane produced white precipitate, filtered, and...

Embodiment 2

[0047] N-Alkylpyridine tetrafluoroborate is prepared by the following process: Add a certain amount of n-butane bromide (33mmol) into a three-necked round-bottomed flask, a constant pressure dropping funnel with 30mmol pyridine and a drying tube Condensation and reflux device, fixed on the upper end of the transducer of the ultrasonic cleaner, start ultrasonication, slowly add pyridine dropwise at a rate of 10mL / min, and Ar protection ultrasonic intermittent operation mode. A solid was formed, and the reaction was stopped after 2 hours of reaction, and a light yellow solid was obtained by filtration. The pale yellow solid was mixed with 31.5mmol sodium tetrafluoroborate (NaBF 4 ) and 54mmol of acetone were added to a single-necked round-bottomed flask with a condensing reflux device, and filtered under magnetic stirring at room temperature for 12 hours to remove the white precipitate NaBr, and 20 mL of dichloromethane was added to the filtrate to form a white precipitate, whic...

Embodiment 3

[0050] N-Alkylpyridine tetrafluoroborate is prepared by the following process: Add a certain amount of bromododecane (39mmol) into a three-necked round-bottomed flask, a constant pressure dropping funnel with 30mmol pyridine and a drying tube Condensation and reflux device, fixed on the upper end of the transducer of the ultrasonic cleaner, start ultrasonication, drop pyridine at a rate of 8mL / min, and Ar protection ultrasonic intermittent operation mode. After 2.2 hours of reaction, the reaction was stopped, and a light yellow solid was obtained by filtration. The pale yellow solid was mixed with 34.5mmol sodium tetrafluoroborate (NaBF 4 ) and 60mmol of acetone were added to a single-necked round-bottomed flask with a condensing reflux device, filtered under magnetic stirring at room temperature for 13 hours, and the white precipitate NaBr was removed, and 30 mL of dichloromethane was added to the filtrate to form a white precipitate, which was filtered and removed by rotary ...

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Abstract

The invention discloses an oil refinery distillation tower top corrosion inhibitor resistant to dilute hydrochloric acid and hydrogen sulfide corrosion. According to the mass percentage, it comprises: greater than or equal to 98% of pyridyl ionic liquid, the rest is NaBr, and the pyridyl ionic liquid is N-alkane N-alkylpyridine tetrafluoroborate or N-alkylpyridine hexafluorophosphate. The corrosion inhibitor of the invention has the characteristics of good anti-corrosion effect, less dosage, low cost, good water solubility and environmental friendliness in the process of industrialized production and application.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to an oil refinery distillation tower top corrosion inhibitor resistant to dilute hydrochloric acid and hydrogen sulfide corrosion. Background technique [0002] Atmospheric and vacuum distillation is the first process of crude oil in the petroleum refining process, and is the basis of the entire petroleum refining. According to API 571-2011 "Refinery Equipment Damage Mechanism", there are as many as 20 types of damage involved in atmospheric and vacuum distillation equipment, and there are 8 types of damage in atmospheric distillation overhead systems. HCl Corrosion and H in the Top System of Atmospheric and Vacuum Distillation Unit 2 S corrosion has always been an important problem plaguing refineries at home and abroad, and it is the bottleneck restricting the long-term operation of refining and chemical enterprises. According to the analysis of the physic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/04C10G7/10
CPCC23F11/04C10G7/10
Inventor 范磊尹成先杜笑怡张娟涛王峰王延海赵儒盼袁军涛
Owner BC P INC CHINA NAT PETROLEUM CORP
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