Vanconol ®RF-401 Refinery Overhead Corrosion Inhibitor

Abstract

Vanconol ®RF-401 is a high-performance corrosion inhibitor specifically developed for refinery systems, suitable for operating conditions below 180°C. It effectively addresses low-temperature corrosion issues caused by HCl-H₂S-H₂O systems. Through intramolecular heteroatoms such as N and metal-anchoring groups, it forms a monomolecular adsorption film on metal surfaces, isolating corrosive media from metal contact and slowing electrode reaction rates. This significantly reduces equipment corrosion rates and extends equipment service life, ensuring stable refinery operation while lowering safety risks and production costs.

Core Product Information

Item	Technical Specification	Test Method
	RF—401
Appearance	Light yellow transparent liquid	Visual inspection
Density (d20) g/cm3	0.90-1.10	GB/T 13378
Kinematic viscosity mm2/s	≤80 (at 40°C)	GB/T 265
Pour point (°C)	≤-10	GB/T 510
Corrosion inhibition efficiency %	≥90%	Static weight-loss method
Note: Corrosion inhibition efficiency test standard: Q/SHCG 110—2017

Key Features and Advantages

◼ Targeted Performance: Specifically designed for low-temperature corrosion scenarios in refineries, effectively addressing uniform corrosion and pitting corrosion caused by HCl-H₂S-H₂O systems, particularly suited for severe corrosion zones such as vapor-liquid transition points.

◼ Efficient Protection: Molecules rapidly adsorb onto metal surfaces forming coordination bonds, creating a dense monomolecular adsorption film that provides dual-barrier protection against corrosive media contact and H ion diffusion, delivering stable corrosion inhibition performance.

◼ Broad Applicability: Suitable for various refinery applications including atmospheric/vacuum distillation unit overhead systems, hydrotreating unit reactor effluent systems, FCC unit fractionator overhead systems, and cooling water systems.

◼ Operational Flexibility: Can be diluted for use; dosage can be adjusted based on corrosive media content in the feedstock. Economic dosage can be determined through laboratory testing to minimize usage costs.

Application Guide

Recommended Application Areas

Vanconol ®RF-401 corrosion inhibitor is particularly suitable for various low-temperature corrosion conditions in refineries (operating temperature below 180°C), providing corrosion protection for overhead recycle exchangers, overhead heat exchangers, air coolers, and associated piping, effectively extending equipment service life, ensuring stable unit operation, and reducing maintenance and safety risks.

Usage Method and Recommended Dosage

☑ Pre-operation preparation: Inspect product packaging for integrity and confirm the product is in a flowable state (if solidified, pre-heat to melt before use).

☑ Dilution preparation: For a 20% injection concentration example, transfer 200kg of product into a clean mixing tank equipped with agitation, then add 800kg of softened water. Agitate until uniform; a homogeneous liquid upon sampling indicates proper preparation. Dilution ratio can be adjusted based on site requirements.

☑ Dosage calculation: Active inhibitor concentration should not be less than 5ppm, continuously injected via metering pump. Specific dosage varies depending on corrosive media content in the feedstock; laboratory testing is recommended prior to use to determine the economical dosage.

☑ Monitoring during use: Periodically monitor iron ion content in the cooling water, ensuring it remains below 3ppm. Adjust inhibitor injection rate accordingly based on test results.

Safety and Storage

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

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

◆ Packaging and shelf life: Product is packaged in plastic drums with a net content of 220L per drum. Custom packaging is available upon request. Shelf life is one year under ambient conditions. Seal remaining product after use to prevent evaporation.

Frequently Asked Questions (FAQ)

Q: What specific operating conditions is RF-401 corrosion inhibitor suitable for?

A: RF-401 corrosion inhibitor is designed specifically for refinery systems, suitable for low-temperature corrosion scenarios with operating temperatures below 180°C, including atmospheric/vacuum distillation unit overhead systems, hydrotreating unit reactor effluent systems, FCC unit fractionator overhead systems, and cooling water systems, particularly in environments containing HCl-H₂S-H₂O corrosive media.

Q: How to accurately determine the dosage of RF-401 corrosion inhibitor?

A: An initial active concentration of not less than 5ppm is recommended. The specific dosage should be determined through laboratory testing based on the corrosive media content of the feedstock. During operation, monitor iron ion content in the cooling water (maintain below 3ppm) and adjust injection rate accordingly to ensure optimal corrosion inhibition efficiency and cost-effectiveness.

Contact Us and Documentation

For more detailed information, technical support, or sample requests regarding Vanconol ®RF-401 refinery overhead corrosion inhibitor, please contact our customer service representative. We are committed to providing professional consultation and solutions.