Ferrous Chloride
FeCl₂
Ferrous chloride is an iron(II) coagulant solution used for wastewater coagulation, hydrogen sulphide (H₂S) scavenging, refinery de-oiling and oil-production water-flooding systems. CHIMI ART supplies it as a greenish aqueous solution at concentrations up to 30% FeCl₂ with a specific gravity of 1.25-1.35, manufactured in Egypt and delivered in drums, IBCs or bulk flexitanks with a certificate of analysis.
Product Overview
Ferrous chloride is an iron(II) coagulant solution used for wastewater coagulation, hydrogen sulphide (H₂S) scavenging, refinery de-oiling and oil-production water-flooding systems. CHIMI ART supplies it as a greenish aqueous solution at concentrations up to 30% FeCl₂ with a specific gravity of 1.25-1.35, manufactured in Egypt and delivered in drums, IBCs or bulk flexitanks with a certificate of analysis.
Technical Specifications
- Chemical Formula
- FeCl₂
- CAS Number
- 7758-94-3
- Appearance
- Greenish liquid
- Concentration
- up to 30% FeCl₂
- Specific Gravity
- 1.25-1.35
- pH Range
- 1.5-3.0 (1% solution)
- Solubility
- Fully miscible with water
- Available Packaging
- 200L drums · 1000L IBC · Bulk flexitank
- Shelf Life
- 12 months
- Storage Conditions
- Polyethylene containers
| Property | Value |
|---|---|
| Chemical Formula | FeCl₂ |
| CAS Number | 7758-94-3 |
| Appearance | Greenish liquid |
| Concentration | up to 30% FeCl₂ |
| Specific Gravity | 1.25-1.35 |
| pH Range | 1.5-3.0 (1% solution) |
| Solubility | Fully miscible with water |
| Available Packaging | 200L drums · 1000L IBC · Bulk flexitank |
| Shelf Life | 12 months |
| Storage Conditions | Polyethylene containers |
Applications
Dosing Guidelines
Dosing is application-specific. For coagulation duties, typical doses fall in the range of 50-300 mg/L, with the optimum confirmed by jar testing on the actual water. For H₂S scavenging, the dose is set in proportion to the measured sulphide concentration and dosed continuously at a point with good mixing, then trimmed against residual sulphide readings. Feed the solution with chemical-resistant metering pumps, either neat or diluted, and verify pH and iron residuals downstream. Site trials are recommended before fixing a permanent dosing regime.
How It Works
Ferrous chloride supplies dissolved Fe²⁺, which destabilises colloidal particles by neutralising their negative surface charge so they can aggregate and settle. Its most distinctive chemistry is sulphide control: Fe²⁺ reacts with dissolved sulphide to precipitate highly insoluble iron sulphide, removing H₂S from the water phase and suppressing odour and corrosion in sewers, digesters and sour-water systems. In aerated or oxidising conditions, ferrous iron gradually oxidises to Fe³⁺, which hydrolyses to ferric hydroxide floc and contributes sweep coagulation — useful in de-oiling and clarification duties, where destabilised oil droplets attach to the growing floc and are floated or settled out. Because performance depends on redox conditions, pH and the sulphide load, jar testing or a plant trial is the reliable way to set the operating point.
Usage Tips
Ferrous chloride is an acidic, corrosive liquid: handle it with chemical-resistant pumps, piping and gaskets, and wear acid-resistant gloves, eye protection and protective clothing. Store in polyethylene containers or lined tanks in a cool, well-ventilated area away from direct sunlight; shelf life is 12 months. Keep containers tightly closed and minimise air contact, since exposure to oxygen slowly oxidises ferrous iron to the ferric form. Provide spill containment at the storage area and flush any splashes with plenty of water.
Certifications & Compliance
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Frequently Asked Questions
What is the primary difference between Ferric and Ferrous Chloride?
Ferrous Chloride contains iron in the +2 oxidation state, making it effective for specific applications like H₂S scavenging and anaerobic treatment. It's particularly useful in oil field applications and refinery de-oiling systems.
How should Ferrous Chloride be stored to prevent oxidation?
Store in sealed containers with minimal air exposure to prevent oxidation to ferric form. Keep in cool, well-ventilated areas away from oxidizing agents. Use nitrogen blanketing for long-term storage of large quantities.
Can Ferrous Chloride be used in aerobic treatment systems?
While possible, Ferrous Chloride oxidizes to ferric form in aerobic conditions. For aerobic systems, direct use of Ferric Chloride is typically more cost-effective and predictable in performance.
What are the main applications for Ferrous Chloride in oil refining?
Primary uses include H₂S scavenging in sour water systems, oil-water separation enhancement in DAF units, and heavy metals precipitation in refinery wastewater treatment.
How does solution concentration affect handling and performance?
Higher concentrations (up to 30%) reduce shipping costs but require more careful handling due to increased corrosivity. Lower concentrations are easier to handle but may require larger dosing systems and storage volumes.
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