Vanconol® RF-403 Corrosion Inhibitor
----------Refinery Oil-Soluble
1. Abstract
Vanconol® RF-403 is a high-efficiency oil-soluble corrosion inhibitor specifically designed for low-temperature corrosion scenarios in refineries. It is suitable for working conditions with an operating temperature < 150℃ and specifically addresses uniform corrosion and pitting corrosion caused by the HCl-H₂S-H₂O system, especially suitable for severe corrosion areas such as two-phase transition zones. Through heteroatoms such as N and metal-philic anchoring groups in the molecule, a coordinate bond adsorption film is formed on the metal surface, which blocks the contact of corrosive media, reduces the diffusion rate of H ions, and slows down the electrode reaction. It effectively copes with corrosion caused by ammonium chloride salt formation and blockage in atmospheric and vacuum distillation units, hydrogen sulfide corrosion in catalytic cracking units, and other issues, extending the service life of equipment, reducing maintenance costs and safety risks, and ensuring stable operation of the units.
2. Core Product Information
Item Name | Technical Indicators (RF-403) |
Appearance | Transparent liquid |
Oil Solubility | Miscible with straight-run gasoline in any ratio, no phase separation |
Density (d₂₀) (g/cm³) | 0.8-1.00 |
Kinematic Viscosity (mm²/s) | ≤80 (40℃) |
Flash Point (Closed Cup) (℃) | ≥61 |
Freezing Point (℃) | ≤－30 |
Corrosion Inhibition Rate (%) | ≥95% |
Note: The corrosion inhibition evaluation method refers to Q/SHCG 110-2017 |
Main Features and Advantages
Oil-Soluble Compatibility: Specifically designed for oil-phase systems, diluted and prepared with light oil, it has excellent compatibility with refinery process media, disperses uniformly, and provides comprehensive protection without dead corners.
Targeted Corrosion Protection: Precisely suitable for the overhead system of atmospheric and vacuum distillation units, the reaction effluent system of hydrogenation units, the overhead system of fractionating towers in catalytic cracking units, and circulating water systems. It focuses on protecting equipment and pipelines such as overhead circulating heat exchangers, overhead heat exchangers, and air coolers, specifically addressing core issues such as ammonium chloride salt formation corrosion and hydrogen sulfide corrosion.
Pre-Film Enhancement: During the initial startup period, a dense protective film can be quickly formed through high-concentration pre-film treatment (90-150ppm), and then the dosage is reduced to the conventional level (30-40ppm) to maintain the protective effect, adapting to working conditions such as equipment startup/shutdown and fluctuations in raw material properties.
Reliable Mechanism: The monomolecular adsorption film double blocks the contact of corrosive media and the diffusion of H ions, fundamentally inhibiting corrosion reactions. The corrosion inhibition effect is stable and long-lasting, adapting to complex low-temperature corrosion systems below 150℃.
3. Application Guide
3.1 Recommended Application Fields
Vanconol® RF-403 Oil-Soluble Corrosion Inhibitor focuses on low-temperature corrosion protection in refineries below 150℃. It is suitable for core equipment such as atmospheric and vacuum distillation units, hydrogenation units, and catalytic cracking units. It focuses on solving corrosion problems of overhead circulating heat exchangers, overhead heat exchangers, air coolers, and related pipelines in the overhead system and circulating water system, especially suitable for scenarios such as corrosion caused by ammonium chloride salt formation and blockage, and hydrogen sulfide corrosion, ensuring continuous and stable operation of the units.
3.2 Usage Methods and Recommended Dosage
Pre-operation Preparation: Check if the product in the packaging barrel is in a molten state. If solidified, it needs to be preheated and melted in advance.
Dilution and Preparation: Taking a 20% concentration injection solution as an example, extract 200kg of this product into a clean mixing tank with stirring, then add 800kg of light oil, stir until it becomes a homogeneous liquid, and take a sample for observation; it is considered qualified if there is no stratification.
Conventional Dosage: The conventional injection amount of active substances is 30-40ppm, which is continuously injected using a metering pump; the specific dosage can be adjusted according to the content of corrosive media in raw materials.
Pre-Film Treatment: During the initial startup period (8-10 days), pre-film treatment is required, and the injection amount is 90-150ppm (calculated by processing capacity); after the protective film is formed, gradually reduce it to about 30ppm to maintain protection. When the raw material quality is poor, the injection amount can be appropriately increased; when the raw material quality is good, it can be appropriately reduced.
Usage Monitoring: Regularly detect the iron ion content in the overhead water cut to ensure it is < 3ppm, and adjust the injection amount according to the test results and changes in raw material properties.
4. Safety and Storage
Safe Operation: Wear protective gloves and goggles during use to avoid direct contact with skin and eyes. In case of accidental contact, immediately rinse with a large amount of clean water and seek medical help if necessary.
Storage Conditions: The product should be stored in a clean, cool, and dry warehouse, away from direct sunlight, high temperature, and fire sources. During storage and transportation, it is necessary to protect from sunlight, fire, moisture, and collision.
Packaging and Shelf Life: The product is packaged in plastic barrels with a net content of 220L per barrel. Other packaging can be customized according to user requirements. The shelf life is one year at room temperature. The remaining product after use should be sealed and stored to prevent volatilization.
5. Frequently Asked Questions (FAQ)
Q: What are the core differences between RF-403 Corrosion Inhibitor and RF-401, RF-402?
A: The core difference lies in solubility characteristics and applicable scenarios: RF-403 is an oil-soluble corrosion inhibitor that needs to be diluted and prepared with light oil, making it more suitable for oil-phase-dominated refinery process systems; the applicable temperature focuses on < 150℃, and a new startup pre-film treatment process is added, with stronger targeting.
Q: What is the function of pre-film treatment? How to determine the pre-film cycle and dosage?
A: Pre-film treatment can quickly form a dense protective film on the metal surface during the initial startup period, improving the stability of subsequent protection. The pre-film cycle is 8-10 days after startup, and the injection amount is 90-150ppm (calculated by processing capacity); after the protective film is formed (which can be verified by the stable iron ion content < 3ppm), gradually reduce it to the conventional dosage.
Q: How to adjust the injection amount of RF-403 when the raw material properties fluctuate?
A: When the raw material quality is poor (high content of corrosive media), the injection amount can be appropriately increased (the upper limit of conventional dosage is 40ppm, and the upper limit of pre-film amount is 150ppm); when the raw material quality is good, it can be reduced to about 30ppm, the lower limit of conventional dosage. The core is to ensure that the iron ion content in the overhead water cut is < 3ppm.
6. Contact Us and Information Acquisition
For more detailed technical parameters, test reports, sample applications, or technical support about Vanconol® RF-403 Refinery Oil-Soluble Corrosion Inhibitor, please contact our customer representative. We will provide you with professional customized solutions and comprehensive services.
