Product Center / Imidazoline Corrosion Inhibitor Series

BXH-101 Water-soluble Imidazoline Polyoxyethylene Ether (Polyoxyethylene Ether)

Suitable for corrosion protection in aqueous environments of petrochemical refining units, inhibiting corrosion of carbon steel by corrosive media such as HCl·H₂S·CO₂

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Product Specifications

Project	Technical Indicators	Testing Standards/Methods
Appearance	Yellow to brown viscous liquid	Visual inspection
Solubility	Soluble in water and alcohol	Visual inspection
Density (20℃), g/cm³	0.95~1.10	GB/T 2540
Freezing point, ℃	≤0	GB/T 510
pH (1% aqueous solution)	≥7.0	SH/T 0069
Effective content, %	≥95	Solid content, 100℃

BXH-101 Water-soluble Imidazoline Polyoxyethylene Ether finished product blue barrel real shot – Hubei Benxin factory packaging

BXH-101 Real shot of water-soluble imidazoline polyoxyethylene ether finished product storage yard – petrochemical refining corrosion inhibitor

Applicable scenarios

⚙️ Atmospheric and vacuum distillation tower top: Protection against steam corrosion containing HCl, used in conjunction with ammonia injection
⚙️ Catalytic cracking (FCC) fractionation tower: Inhibit the corrosion of H₂S and moisture on the tower top condensation system
⚙️ Delayed coking device: Protection of the oil and gas line at the top of the coking tower to prevent vapor phase corrosion
⚙️ Circulating water system: Equipped with corrosion inhibition to extend the life of the heat exchanger
⚙️ Natural gas gathering and transportation pipeline:H₂S·CO₂ corrosion protection of gas field ground pipe network
🏭 Industrial cleaning / pickling: 0.1-0.5% concentration as pickling inhibitor to protect base metal
🔩 Electroplating & machining: process inhibitor for electroplating and inter-process rust prevention of machined parts

Product advantages

✔ The imidazoline head group is strongly adsorbed on the metal surface, and the corrosion inhibition efficiency is >85% (coupling test)
✔ Good water solubility, easy to add, does not affect the quality of downstream products
✔ Good compatibility with demulsifiers, neutralizing amines and other additives
✔ Former National Hi-Tech Enterprise certification, guaranteed by 13 national patents (3 invention, 10 utility model)

Typical application cases

A CNPC Refinery Atmospheric and Vacuum Unit

CNPC · A Certain Refinery

BXH-101 injected into overhead wash water (5-20 ppm on feed basis) as part of the standard desalting-and-injection anti-corrosion program, controlled to condensate Fe²⁺ ≤1 mg/L and pH 5.5-6.5, with coupon-tested inhibition efficiency >85%.

Daxie PetrochemicalFCCfractionating tower

Ningbo Daxie Petrochemical · Catalytic Cracking

BXH-101/102 are our flagship export concentrates: multiple export orders delivered on schedule since 2025, with overseas customers verifying quality through their own formulation programs.

Industrial cleaning & metalworking

PetroChina·Jingmen Petrochemical Company

At 0.1-0.5% concentration, used as a pickling inhibitor for equipment and workpieces, in electroplating processes and for inter-process rust prevention of machined parts — a mature application field beyond refineries.

FAQ

What is the difference between water-soluble imidazoline polyoxyethylene ether and oil-soluble one?

Water-soluble imidazoline (BXH-101) is dissolved in the water phase and injected into the washing water at the top of the tower to protect the aqueous corrosive environment; oil-soluble imidazoline (BXH-102) is dissolved in the oil phase and injected into circulating oil to protect the pipe wall. The two mechanisms are complementary and are usually used together in refineries.

Which petrochemical refining units is BXH-101 suitable for?

BXH-101 is mainly suitable for: ① Atmospheric and vacuum distillation tower top condensation system; ② FCC catalytic cracking fractionation tower top; ③ Hydrocracking/refined water injection system; ④ Delayed coking fractionation tower top. The above devices all have HCl+H₂S+CO₂ compound corrosion problems, and BXH-101 can effectively form a film for protection.

What is the standard dosage of imidazoline corrosion inhibitor?

The recommended filling amount is 5–20 mg/L (based on aqueous flow rate), depending on: corrosive medium concentration (Cl⁻ content), operating temperature, flow rate and pH value. It is recommended to start with 20 mg/L for the first time, and then lower it to the maintenance amount based on corrosion monitoring data after stabilization.

Are water-soluble imidazolines effective under high temperature and pressure conditions?

BXH-101 is designed to be used at a temperature ≤150°C. Film formation efficiency decreases beyond this temperature. For high-temperature conditions above 180°C, it is recommended to use phosphorus-free high-temperature corrosion inhibitor BXH-103. Short-term high temperature scenarios between 150-180℃ can be used in combination with BXH-103.

In-depth analysis: BXH-101 Water-soluble Imidazoline Polyoxyethylene Ether

Why choose water-soluble imidazoline?

In the atmospheric and vacuum distillation unit, the top condensation system contains three highly corrosive media: HCl, H₂S and CO₂, which dissolve in the condensed water to form hydrochloric acid and hydrosulfuric acid, causing severe pitting and uniform corrosion of carbon steel equipment. Water-soluble Imidazoline Polyoxyethylene Ether (BXH-101) can be dissolved in water-containing streams and form a dense adsorption film on the metal surface to control the corrosion rate below 0.1 mm/a.

Compared with traditional phosphorus-based corrosion inhibitors, imidazoline products are phosphorus-free, biodegradable, and meet the clean production requirements of refineries; compared with simple neutralizing corrosion inhibitors, BXH-101 is effective in a wide range of pH 4.5–7.5 and does not rely on precise pH control.

BXH-101 Core technical indicators

index	value/description
Appearance	Brown to brown-red transparent liquid
active ingredients	Imidazoline compounds ≥45%
Density (20℃)	1.02–1.06 g/cm³
water soluble	Completely soluble in water, transparent and uniform
Use temperature	≤150℃ (can withstand 180℃ in the short term)
Implementation standards	Q/BXH 001—2023

BXH-101 vs similar products: core differences

✓ Wide pH adaptability

pH 4.5–7.5 full coverage, no need for precise neutralization to be effective

✓ Phosphorus-free formula

Meets the zero phosphorus discharge requirements for sewage without affecting biochemical treatment

✓ Good compatibility

Compatible with neutralizers, desalting agents, and demulsifiers, and does not produce precipitation

✓ Low dosage

5–20 mg/L can achieve corrosion inhibition efficiency ≥88% and excellent economy

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