Vanconol ®RF-403 Oil-soluble Corrosion Inhibitor for Refining

Abstract

Vanconol ®RF-403 is an oil-soluble, high-efficiency corrosion inhibitor specifically designed for low-temperature corrosion scenarios in refineries. It is suitable for operating temperatures below 150℃ and is formulated to address uniform corrosion and pitting corrosion in HCl-H₂S-H₂O systems, with particular suitability for severe corrosion zones such as phase transition points. Through heteroatoms including intramolecular N and metal-anchoring groups, it forms a coordination-bond adsorption film on metal surfaces, blocking corrosive media contact and reducing H ion diffusion rates, thereby slowing electrode reactions. It effectively addresses corrosion caused by ammonium chloride salt deposition and blockage in atmospheric/vacuum distillation units, as well as hydrogen sulfide corrosion in fluid catalytic cracking units, extending equipment service life, reducing maintenance costs and safety risks, and ensuring stable unit operation.

Key Product Information

Parameter	Specification
	RF—403
Appearance	Clear liquid
Oil solubility	Miscible with straight-run gasoline in all proportions, no phase separation
Density (d20) g/cm3	0.8–1.00
Kinematic viscosity mm2/s	≤80 (40℃)
Flash point (closed cup)/℃	≥61
Pour point (℃)	≤−30
Corrosion inhibition efficiency %	≥95%
Note: Corrosion inhibition performance evaluated per Q/SHCG 110-2017

Key Features and Advantages

◼ Oil-soluble compatibility:Specifically designed for oil-phase systems, formulated with light oil dilution, offering excellent compatibility with refinery process media, uniform dispersion, and comprehensive protection.

◼ Targeted corrosion prevention:Precisely suited for atmospheric/vacuum distillation unit overhead systems, hydroprocessing unit reactor effluent systems, FCC unit fractionator overhead systems, and circulating water systems. Provides focused protection for overhead condensing heat exchangers, overhead heat exchangers, air coolers, and associated piping, specifically addressing core issues such as ammonium chloride salt deposition corrosion and hydrogen sulfide corrosion.

◼ Enhanced pre-filming:During initial startup, a dense protective film can be rapidly formed through high-concentration pre-filming treatment (90–150 ppm), followed by reduction to normal dosage levels (30–40 ppm) to maintain protection, accommodating equipment start-up/shutdown and feedstock property fluctuations.

◼ Reliable mechanism:The monomolecular adsorption film provides dual-barrier protection by blocking corrosive media contact and H ion diffusion, inhibiting corrosion reactions at the source. Corrosion inhibition performance is stable and long-lasting, suitable for complex low-temperature corrosion systems below 150℃.

Application Guide

Recommended Applications

Vanconol ®RF-403 oil-soluble corrosion inhibitor is focused on low-temperature corrosion protection in refineries below 150℃, suitable for core equipment including atmospheric/vacuum distillation units, hydrotreating units, and FCC units. It specifically addresses corrosion issues in overhead systems and circulating water systems, including overhead condensing heat exchangers, overhead heat exchangers, air coolers, and associated piping. It is particularly well-suited for corrosion caused by ammonium chloride salt deposition and hydrogen sulfide, ensuring continuous and stable unit operation.

Usage and Recommended Dosage

☑ Pre-operation preparation:Check whether the product in the packaging drum is in a molten state; if solidified, pre-heat to melt before use.

☑ Dilution and preparation:For a 20% concentration injection solution as an example, draw 200 kg of this product into a clean mixing tank equipped with agitation, then add 800 kg of light oil and stir until a homogeneous liquid is achieved. Sampling and observing no phase separation indicates proper preparation.

☑ Normal dosage:Typical active matter injection rate is 30–40 ppm, continuously injected using a metering pump; specific dosage may be adjusted based on corrosive media content in the feedstock.

☑ Pre-filming treatment:During initial startup (8–10 days), pre-filming is required at an injection rate of 90–150 ppm (based on throughput); after the protective film is established, gradually reduce to approximately 30 ppm for maintenance. Injection rate may be increased when feedstock quality is poor and decreased when feedstock quality is good.

☑ Performance monitoring:Periodically test the iron ion content in overhead draw-off water, ensuring it remains below 3 ppm, and adjust injection rates based on test results and feedstock property changes.

Safety and Storage

◆ Safe handling:Protective gloves and safety glasses should be worn during use to avoid direct contact with skin and eyes. In case of accidental contact, rinse immediately with plenty of water and seek medical attention if necessary.

◆ Storage conditions:The product should be stored in a clean, cool, and dry warehouse, away from direct sunlight, high temperatures, and ignition sources. Protection from sun, fire, moisture, and impact is required during storage and transportation.

◆ Packaging and shelf life:The product is packaged in plastic drums with a net weight of 220 L per drum; other packaging options are available upon request. Shelf life at ambient temperature is one year. Residual product after use should be sealed and stored to prevent evaporation.

FAQ (Frequently Asked Questions)

Q: What is the core difference between RF-403 and RF-401,RF-402 corrosion inhibitors?

A: The core difference lies in solubility characteristics and applicable scenarios:RF-403 is anoil-soluble corrosion inhibitor that requires dilution with light oil, making it more suitable for oil-phase-dominated refinery process systems. Its applicable temperature range is focused below 150℃, and it incorporates astartup pre-filming treatment procedure for more targeted protection.

Q: What is the purpose of pre-filming treatment? How arepre-filming duration and dosage determined?

A: Pre-filming treatment rapidly forms a dense protective film on metal surfaces during initial startup, enhancing the stability of subsequent protection.The pre-filming period is 8–10 days after startup, with an injection rate of 90–150 ppm (based on throughput); once the protective film is established (verified by stable iron ion content below 3 ppm ), gradually reduce to normal dosage levels.

Q: How should RF-403 injection rates be adjusted when feedstock properties fluctuate?

A: When feedstock quality is poor (high corrosive media content), the injection rate may be increased appropriately (up to the normal dosage upper limit of 40 ppm, with apre-filming upper limit of 150 ppm); when feedstock quality is good, the rate may be reduced to the normal dosage lower limit of approximately 30 ppm. The key requirement is to ensure overheaddraw-off water iron ion content remains below 3 ppm.

Contact Us and Documentation

For more detailed technical specifications, test reports, sample requests, or technical support regarding Vanconol ®RF-403 oil-soluble corrosion inhibitor for refining, please contact our customer representatives. We will provide professional, customized solutions and comprehensive service.