Vanconol® RF-401N Neutralizing Corrosion Inhibitor
Vanconol® RF-401N Neutralizing Corrosion Inhibitor
Abstract
After crude oil enters a refinery, it undergoes the “one desalting and four injections” protection scheme: deep desalination, caustic injection into the crude oil, ammonia (or amine) injection into the overhead distillate line, corrosion inhibitor injection and water injection. This series of measures effectively removes impurities from the crude oil, neutralizes acidic corrosive species in the process, and forms a corrosion-inhibiting adsorption film on equipment surfaces. Vanconol® RF-401N effectively adjusts pH and provides corrosion inhibition, lowering Fe3+ concentration.
Vanconol® RF-401N neutralizing amine corrosion inhibitor is designed for refinery systems and is suitable for corrosion inhibition of equipment and piping in refinery preliminary distillation towers. The product contains no heavy metals or organic chlorides and offers good thermal stability, making it suitable for replacing conventional ammonia and caustic injection processes.
Chemical Description
Water-soluble imidazoline, organic amines, etc.
Core Product Information
| Item | Technical Specification | Test Method |
| Appearance | Yellow to brown homogeneous liquid | Visual inspection |
| Water solubility | Miscible with water in any ratio | Visual inspection |
| pH value (10% aqueous solution, 25 °C) | >11 | pH meter |
| Freezing point (°C) | ≤ -20 in winter | GB/T 510 |
| Kinematic viscosity (40 °C, mm2/s) | 80 | GB/T 265 |
| Corrosion inhibition rate (25 ppm, %) | ≥90 | Q/SHCG109-2017 |
Application
Tower overhead vapor lines.
Instructions for Use
Pump the corrosion inhibitor into the dosing tank and inject it into the process water system via a metering pump. Adjust the dosage dynamically according to the pH of the system outlet water, and adjust the corrosion inhibitor dosage according to the iron ion concentration. The film-forming period of the product is 7–10 days; based on the unit feed rate, the injection concentration is 20–50 ppm. During normal operation, the dosage is 10–30 ppm; once operating conditions have stabilized, return to the original injection rate.
When unit operating conditions and feedstock properties change, or when the overhead flow velocity changes, the passivation film formed by the corrosion inhibitor can be damaged to a considerable extent, causing occasional rises in iron ions and fluctuations in pH. In such cases, the dosage may be appropriately increased.
Packaging, Storage and Transportation
The product is packed in plastic drums with a net content of 220 L per drum. Other packaging is available on request.
During storage and transportation, protect the product from sunlight, fire, moisture and impact, and store it in a clean, cool and dry warehouse. If product remains in the container after use, reseal it to prevent evaporation. The shelf life of this product at room temperature is one year.