Crude oil demulsifier is an oil field chemical agent for oil-water separation of petroleum production fluid. Its demulsification principle is that the demulsifier penetrates deeply and adheres to the interface of the emulsified droplets, replaces the original emulsifier and destroys the surface film, and coats the film. The droplets are released and coalesced, so that the oil and water phases are separated. Because the oil extraction technology does not change from the initial water injection to thermal recovery of heavy oil, to alkaline water flooding, surfactant flooding, polymer flooding and tertiary oil recovery, the colloids, asphalt, naphthenic acid in crude oil The emulsification of, fatty acid and salt, crystalline paraffin, and artificially introduced various surface-active substances makes the extracted crude oil present the form of emulsion. In addition, due to the continuous advancement of new technologies, most of the current oil fields in my country have entered a period of high water cut. The crude oil emulsion has changed from CDE type to EDC type. The demulsification mechanism and other aspects have also undergone great changes. For an ideal crude oil demulsifier, it should have strong surface activity, good wetting performance, sufficient flocculation ability, and better coalescence effect. While meeting the needs of oilfields and ensuring the demulsification and dehydration effect of crude oil, it has also greatly promoted the development of crude oil demulsifiers.Crude oil demulsifier is an oil field chemical agent for oil-water separation of petroleum production fluid. Its demulsification principle is that the demulsifier penetrates deeply and adheres to the interface of the emulsified droplets, replaces the original emulsifier and destroys the surface film, and coats the film. The droplets are released and coalesced, so that the oil and water phases are separated. Because the oil extraction technology does not change from the initial water injection to thermal recovery of heavy oil, to alkaline water flooding, surfactant flooding, polymer flooding and tertiary oil recovery, the colloids, asphalt, naphthenic acid in crude oil The emulsification of, fatty acid and salt, crystalline paraffin, and artificially introduced various surface-active substances makes the extracted crude oil present the form of emulsion. In addition, due to the continuous advancement of new technologies, most of the current oil fields in my country have entered a period of high water cut. The crude oil emulsion has changed from CDE type to EDC type. The demulsification mechanism and other aspects have also undergone great changes. For an ideal crude oil demulsifier, it should have strong surface activity, good wetting performance, sufficient flocculation ability, and better coalescence effect. While meeting the needs of oilfields and ensuring the demulsification and dehydration effect of crude oil, it has also greatly promoted the development of crude oil demulsifiers.

Generally speaking, there are three types of low-temperature corrosion in the condensing cooling system at the top of the crude distillation unit:

(1) The HCl and H₂S gas at the top of the tower dissolve in liquid water to form a HCl-H₂S-H₂O dew point corrosion environment.

(3) When the acid water at the top of the tower is excessively neutralized, a corrosion environment under FeS scale is formed; or the neutralizer enters the gas phase due to its low boiling point and reacts with H₂S gas to form a corrosion environment under NH4HS scale.

The majority of domestic refineries pay more attention to the dew point corrosion of the condensing cooling system at the top of the crude oil distillation unit. The wet hydrogen sulfide corrosion of the secondary or tertiary air-cooling system at the top of the vacuum tower, the corrosion under scale of FeS caused by excessive neutralization, and the under scale corrosion of NH₄HS caused by gas phase neutralization are often overlooked. The neutralizing corrosion inhibitor commonly used in China can effectively slow down the dew point corrosion of the HCl-H₂S-H₂O environment, but it cannot well control the corrosion of FeS and NH₄HS in the condensed water, and the wet hydrogen sulfide corrosion in the gas phase, so it is in use Many problems are exposed in:

(1) The concentration of Fe²⁺ in the condensate water often exceeds the control standard of 3.0mg/L; or although the monitoring concentration of Fe²⁺ in the condensate is low, the cold exchange equipment has frequent corrosion and leakage, and the equipment has a short service life.

(2) Condensate has high pH, serious emulsification, high ammonia nitrogen and COD, and oil content exceeding the standard; it has a greater impact on subsequent sewage treatment.

(3) The dosage is larger and the cost is higher.

The series of neutralizing corrosion inhibitors produced by our company are composed of high boiling point organic amines, amphoteric imidazolines, polycarboxylic acid scale inhibitors and dispersants, gas-liquid two-phase corrosion inhibitors and other components. It can effectively neutralize the acidic substances in the condensation zone at the top of the tower, and can also form a stable and dense protective film on the surface of the equipment. It not only can well control the dew point corrosion and FeS scale corrosion of the low-temperature light oil at the top of the tower, but also can greatly slow down the wet hydrogen sulfide corrosion formed by gas phase condensation, and the gas phase neutralization can cause NH₄HS scale corrosion.

(1) According to the nature of the crude oil processed, the characteristics of the equipment process and the characteristics of the condensate, the proprietary formula is tailored.

(2) It has been successfully used in more than a dozen large atmospheric and vacuum equipment for more than 6 years.

(3) The corrosion inhibition rate is ≥90%, the condensate Fe²⁺ is ≤1.0mg/L, and the service life of the carbon steel air cooler is more than 5 years.

(4) It can slow down the emulsification of the condensed water at the top of the decompression tower, and the ammonia nitrogen, COD and oil content of the condensed water meet the control indicators.

Appearance: uniform liquid

Water solubility (miscible with water in any ratio): no phase separation.

Density (20℃): 0.8~1.1g/cm³

Freezing point: ≤-15℃

pH (10% aqueous solution): ≥11.0

Amine value: ≥200mgKOH/g

Corrosion inhibition rate: ≥90%

It is used to inhibit the hydrochloric acid dew point corrosion of the top condensation system of the atmospheric and vacuum distillation unit, as well as the corrosion under the scale of ammonium salt and FeS.