What is the difference between phosphorus-free high temperature corrosion inhibitor and ordinary high temperature corrosion inhibitor?

BXH-103 Phosphorus-free high-temperature corrosion inhibitor uses special nitrogen-sulfur heterocyclic organic compounds as active components. Compared with phosphorus-based corrosion inhibitors: ① It is phosphorus-free and meets zero phosphorus emission requirements; ② Higher temperature resistance (≤300℃ vs phosphorus-based ≤220℃); ③ Film formation is stable in acidic high-temperature environments (pH 3–6).

FCCWhich corrosion inhibitor should be selected for the catalytic cracking unit?

The top temperature of FCC main fractionation tower is usually 120–180°C. It is recommended that BXH-101 (water phase) + BXH-102 (oil phase) compound scheme be used. For FCC oil slurry circulation line (180–350°C), BXH-103 phosphorus-free high-temperature corrosion inhibitor should be selected, which can withstand high temperature, high pressure and catalyst particle erosion.

What are the dosage standards and injection methods for high-temperature corrosion inhibitors?

BXH-103 Recommended injection volume 15–50 mg/L (based on corrosive medium flow meter). Injection method: continuous injection is the main method. In high-corrosion seasons (high-acid crude oil processing period), it can be increased to 80 mg/L impact treatment in stages. It is recommended to use a metering pump for injection, and the injection point is before the entrance of the high temperature section.

How to select corrosion inhibitors for high-temperature equipment in acidic environments?

Acidic high temperature (pH 200℃) is the worst corrosion condition. BXH-103 is specially designed for this: the active components do not decompose at high temperatures and can form a dense protective film in weakly acidic media. It has been used in the protection of vacuum residual oil heating furnace tubes and high-temperature heat exchangers in many refineries.

Product Center / Refining Unit Corrosion Inhibitor

BXH-103 / RUN-129 Phosphorus-free high temperature corrosion inhibitor

Breaking through the theoretical framework and bottleneck that traditional high-temperature corrosion inhibitors can only use phosphorus-based systems, it provides good corrosion inhibition under vacuum conditions at 220~360℃, and avoids fouling, blockage and unplanned shutdowns of downstream units such as hydrotreating caused by phosphorus-containing high-temperature inhibitors.

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Product Specifications

Project	Technical Indicators	Testing Standards/Methods
Appearance	Uniform tan liquid	Visual inspection
Solubility	Miscible with aromatic hydrocarbons in any ratio	Visual inspection
Density (20℃), g/cm³	0.80~1.00	GB/T 2540
Freezing point, ℃	≤-10	GB/T 510
Closed cup flash point, ℃	≥61	GB/T 261
Phosphorus content, %	≤0.01	SH/T 0296-1992
Chloride ion content, %	≤0.01	ASTM D7536
Corrosion inhibition rate, %	≥90	Q/WRUN002-2019

BXH-103 phosphorus-free high-temperature corrosion inhibitor finished product actual shot

Core advantages

🔥 High temperature resistant film forming: The integrity rate of the protective film under 300°C working conditions is >85%, far exceeding the traditional imidazoline type (the limit is about 180°C)
♻️ True phosphorus-free formula: Phosphorus content <0.001%, meeting the "three phosphorus" control requirements and complying with the latest environmental regulations
🧪 In-house synthesis process: Phosphorus-free high-temperature corrosion inhibition compound system, filling the gap of domestic high temperature phosphorus-free corrosion inhibitors
⚡ Broad spectrum applicable: Suitable for extreme working conditions such as high-temperature cracking, coke treatment, vacuum residual oil, etc.

⚠️Key selection suggestions

When the feedstock acid value is ≥0.5 mgKOH/g and the temperature exceeds 200°C, it is strongly recommended to choose BXH-103/RUN-129 instead of ordinary phosphorus-containing high-temperature inhibitors, addressing both high-temperature corrosion and the impact of phosphorus on oil quality.

Applicable device scenarios

🏭

Vacuum distillation device

Residue oil system at the bottom of the pressure reduction tower, 250–320°C high temperature oil and gas corrosion environment

⚗️

Hydrogenation reactor outflow system

High temperature and high pressure hydrogen environment, NH₄HS·HCl compound corrosion conditions

🔩

Coking vent and fractionation

Delayed coking high-temperature oil and gas pipelines containing H₂S·Organic acid corrosion

🌿

Environmentally sensitive area devices

Park refinery with zero phosphorus emission requirements, replacing phosphorus-containing high-temperature corrosion inhibitors

In-depth analysis: Phosphorus-free high-temperature corrosion inhibitor BXH-103

Why do high-temperature working conditions require special corrosion inhibitors?

Ordinary imidazoline corrosion inhibitors lose their protective effect due to the breakage of adsorption bonds when the temperature is above 150°C. FCC In high-temperature devices such as catalytic cracking, vacuum coking, and residual oil hydrogenation, the operating temperature is generally 200–350°C. At the same time, the concentration of the corrosive medium (naphthenic acid·H₂S·HCl) is high, and the corrosion rate can be as high as 2–5 mm/a. By introducing a highly thermally stable heterocyclic structure, BXH-103 extends the effective operating temperature to 300°C, filling the product gap in the field of high-temperature corrosion inhibition.

Under high-acid crude processing conditions (TAN>1.0 mgKOH/g), BXH-103/RUN-129 is applied to vacuum residue lines and high-temperature heat exchangers with an acceptance criterion of ≥90% inhibition (finished product, Q/SHCG standards). Successfully trialed at a coastal refinery No.2 CDU (signed application report, verified by the client group research institute scale-sample analysis), with an evaluation certificate issued by A Central China refinery.

BXH-103 Key technical parameters

index	numerical value
Appearance	Dark brown homogeneous liquid
Phosphorus content	Not detected (<0.01%)
Use temperature	80–300℃ (can withstand 350℃ in the short term)
Recommended dosage	15–50 mg/L
Naphthenic acid corrosion inhibition	TAN≤4.0 mgKOH/g device is applicable
Implementation standards	Q/BXH 003—2023

Core application scenarios of high temperature corrosion inhibitors

FCC device corrosion inhibitor

FCC Oil slurry circulation line (250–350℃), catalyst particle erosion + naphthenic acid corrosion, BXH-103 high temperature resistance and erosion resistance dual protection

High-acid crude oil processing and anti-corrosion

TAN>1.0 mgKOH/g high-acid crude oil produces strong naphthenic acid corrosion above 220℃, BXH-103 can be applied by online injection for protection

High temperature section of vacuum distillation

The feed section of the pressure reducing tower (330–380°C) and the outlet pipeline of the pressure reducing furnace are the most serious areas of high temperature corrosion. BXH-103 can be protected by injecting crude oil in front of the furnace.

Phosphorus-free compliant alternative

Replaces phosphorus-containing high-temperature corrosion inhibitors to meet the discharge requirements of total phosphorus <1 mg/L in sewage treatment, while maintaining corrosion inhibition efficiency and keeping the overall cost the same

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