Vanconol ®RF-402 Refinery Overhead Corrosion Inhibitor

Abstract

Vanconol ®RF-402 is a high-efficiency corrosion inhibitor specifically developed for core refinery units (atmospheric/vacuum distillation columns, delayed coking units, and hydrogenation units), suitable for operating temperatures below 180℃, targeting low-temperature corrosion issues induced by HCl-H₂S-H₂O systems. Through intramolecular N heteroatoms and metal-anchoring groups, it forms a dense monomolecular adsorption film on metal surfaces, providing dual-barrier protection against corrosive media contact and H ion diffusion, significantly retarding electrode reaction kinetics and effectively suppressing uniform corrosion and pitting. It is particularly well-suited for corrosion-prone zones such as two-phase transition points, extending equipment service life, reducing maintenance costs and safety risks, and ensuring stable and efficient unit operation.

Core Product Information

Parameter	Specification	Test Method
	RF—402 Coking Type	RF—402 Sinopec Version
Appearance	Light yellow liquid	Light yellow liquid	Visual inspection
Water solubility	No phase separation	No phase separation	Visual inspection
Density (d20) g/cm3	0.90-1.10	0.90-1.10	GB/T13378
Kinematic viscosity mm2/s	≤80 (40℃)	≤80 (40℃)	GB/T265
Pour point (℃)	≤-20	≤-20	GB/T510
Corrosion inhibition efficiency %	≥90%	≥80%
Note: Corrosion inhibition efficiency for the coking type is tested per Q/SHCG 110—2017; the Sinopec version is tested per Luoyang Petrochemical method.

Key Features and Advantages

◼ Targeted Protection: Precisely formulated for overhead systems of atmospheric/vacuum distillation units, reactor effluent systems of hydrogenation units, fractionator overhead systems of FCC units, and circulating water systems. Provides critical protection for overhead reflux exchangers, overhead heat exchangers, air coolers, and associated piping, effectively addressing uniform corrosion and pitting at operating temperatures below 150℃.

◼ High Efficiency, Low Dosage: The molecule rapidly forms a coordinate-bond adsorption film with excellent corrosion inhibition performance. A dosage of 15ppm is sufficient to meet the Q/SHCG 110—2017 standard (corrosion inhibition efficiency ≥80%), significantly outperforming competitive products that typically require 40ppm or more. Under continuous injection conditions, dosages as low as 5ppm can still achieve compliance, substantially reducing operating costs.

◼ Reliable Mechanism: The monomolecular adsorption film provides dual-barrier protection against corrosive media and H ion diffusion, retarding electrode reactions at the source. The corrosion inhibition performance is stable and long-lasting, well-suited for the complex HCl-H₂S-H₂O corrosive system.

◼ Operational Flexibility: Supports dilution and formulation, with dosage adjustable based on corrosive media content in the feedstock. Economic dosage can be determined through laboratory testing, accommodating the varying operating conditions of different refineries.

Application Guide

Recommended Application Areas

Vanconol ®RF-402 corrosion inhibitor is focused on low-temperature corrosion protection in refineries (operating temperature below 180℃, with optimal performance below 150℃). It is suitable for atmospheric/vacuum distillation columns, delayed coking units, hydrogenation units, FCC units, and other critical equipment, with key protection for overhead reflux exchangers, overhead heat exchangers, air coolers, and associated piping. It effectively addresses corrosion caused by ammonium chloride salt deposition and plugging, as well as hydrogen sulfide corrosion, ensuring continuous and stable unit operation.

Usage and Recommended Dosage

✓ Pre-operation preparation: Check whether the product in the drum is in a molten state. If solidified, preheat to melt before use.

✓ Dilution: For a 20% injection concentration, transfer 200kg of the product into a clean mixing tank equipped with agitation, then add 800kg of softened water. Stir until a homogeneous liquid is achieved; sample and verify no phase separation to confirm proper preparation. The dilution ratio can be adjusted based on site requirements.

✓ Dosage calculation: Under standard conditions, the active dosage should be ≥15ppm (to achieve corrosion inhibition efficiency ≥80%). Under continuous injection conditions, dosages as low as 5ppm can be effective. Use a metering pump for continuous injection.

✓ Monitoring: Periodically test iron ion content in the cooling water to ensure it remains below 3ppm. Adjust the injection rate based on the corrosive media content of the feedstock, determining the economic dosage through laboratory testing.

Safety and Storage

◇ Safe handling: Wear protective gloves and safety goggles during use, avoiding direct contact with skin and eyes. In case of accidental contact, rinse thoroughly with plenty of water and seek medical attention if necessary.

◇ Storage conditions: Store in a clean, cool, and dry warehouse, away from direct sunlight, high temperatures, and ignition sources. Protect from sun, fire, moisture, and impact during storage and transportation.

◇ Packaging and shelf life: The product is packaged in plastic drums with a net weight of 220L per drum. Customized packaging is available upon request. Shelf life is one year at ambient temperature. After use, seal the remaining product to prevent evaporation.

FAQ

Q: What is the core advantage of RF-402 corrosion inhibitor?

A: The core advantage is high efficiency at low dosage. A concentration of 15ppm is sufficient to meet the Q/SHCG 110—2017 standard (corrosion inhibition efficiency ≥80%), whereas competitive products typically require 40ppm or more. Under continuous injection conditions, dosages as low as 5ppm can still meet iron ion control requirements, substantially reducing operating costs. Additionally, it is precisely tailored for a wide range of low-temperature corrosion scenarios in refineries.

Q: Which specific equipment and operating conditions are suitable for RF-402?

A: It is suitable for refinery units operating below 180℃ (optimized below 150℃), including atmospheric/vacuum distillation overhead systems, hydrogenation unit reactor effluent systems, FCC fractionator overhead systems, and circulating water systems. Key protection targets include overhead reflux exchangers, overhead heat exchangers, air coolers, and associated piping, addressing corrosion induced by the HCl-H₂S-H₂O system.

Q: How should the dosage of RF-402 be scientifically determined?

A: The recommended initial dosage under standard conditions is ≥15ppm. Under continuous injection, this can be reduced to as low as 5ppm. The specific dosage should be determined through laboratory testing based on the corrosive media content in the feedstock. During operation, monitor the iron ion content in the cooling water (target <3ppm) and adjust the injection rate accordingly to balance corrosion protection and cost-effectiveness.

Contact Us and Documentation

For detailed technical data sheets, test reports, sample requests, or technical support regarding Vanconol ®RF-402 refinery overhead corrosion inhibitor, please contact our customer service representatives. We will provide professional, customized solutions and comprehensive support.