2-Ethylhexanoic Acid (2-EHA)

2-Ethylhexanoic Acid (2-EHA) is a chemical compound used in a wide variety of industrial and commercial applications, particularly as a chemical intermediate in the production of metal salts, esters, and plasticizers. It is a colorless, oily liquid with a mild, characteristic odor and is highly soluble in organic solvents like alcohols, ethers, and hydrocarbons.

General Information

• Chemical Name: 2-Ethylhexanoic Acid
• Chemical Formula: C₈H₁₆O₂
• CAS Number: 149-30-4
• Molecular Weight: 144.21 g/mol
• Synonyms: 2-Ethylhexanoate acid, iso-octanoic acid, octanoic acid, 2-ethyl-

Properties of 2-EHA

1. Appearance: Clear, colorless to pale yellow liquid
2. Odor: Mild, characteristic, slightly fatty odor
3. Boiling Point: 207°C (405°F)
4. Melting Point: -55°C (-67°F)
5. Density: 0.87 g/cm³ at 25°C
6. Flash Point: 92°C (198°F)
7. Solubility: Soluble in organic solvents (alcohols, ethers, hydrocarbons); insoluble in water
8. Viscosity: Relatively low, allowing for easy mixing and application in formulations

Uses of 2-Ethylhexanoic Acid

1. Production of Metal Salts:

   • 2-EHA is primarily used to produce metallic salts, particularly zinc and calcium salts of 2-ethylhexanoic acid. These salts are important as stabilizers and plasticizers in the polyvinyl chloride (PVC) industry, helping to improve the processing and durability of PVC products, including pipes, flooring, and wiring.
   • Example: Zinc 2-ethylhexanoate is a common stabilizer for PVC and other polymers.

2. Plasticizers:

   • 2-EHA is used as an intermediate in the manufacture of plasticizers like dioctyl 2-ethylhexyl phthalate (DEHP), which is used to make flexible plastics (PVC products, flexible tubing, etc.).
   • These plasticizers are commonly found in electrical cables, synthetic leather, and flooring materials.

3. Lubricants and Additives:

   • It is used in the production of lubricants, greases, and additives. 2-EHA can act as a dispersing agent or anti-wear additive in industrial lubricants and engine oils.

4. Coatings:

   • Used as a raw material for manufacturing paint driers and coatings. The salts of 2-EHA can help improve the drying times and durability of paints and coatings.

5. Esters for Solvents:

   • 2-EHA is used to create esters, such as 2-ethylhexyl esters, which are valuable solvents. These esters are used in a wide range of industrial and commercial applications, including paints, adhesives, and cleaning agents.
   • 2-EHA esters are effective solvents for resins, oils, and other materials in various formulations.

6. Food Additives:

   • Although less common, 2-EHA and its derivatives have some uses in the food industry as flavoring agents or in food packaging materials, although it is subject to regulation.

7. Pharmaceutical Intermediates:

   • It can be used in the synthesis of some pharmaceutical compounds and active ingredients, although it is more commonly used in industrial and consumer applications.

Advantages of 2-EHA

• Effective Solvent: Its solvent properties make it valuable for use in coatings, adhesives, and cleaning products.
• High Solubility: 2-EHA is highly soluble in various organic solvents, making it versatile for different applications.
• Improved Polymer Properties: In the production of plasticizers and metal salts, it improves the processing, stability, and durability of plastics, especially in PVC.
• Low Freezing Point: Its low freezing point makes it easy to handle and store in colder climates, particularly in bulk quantities.

Safety and Handling Considerations

• Irritation: 2-EHA is mildly irritating to the skin and eyes. Proper protective equipment (gloves, goggles, etc.) should be worn when handling it.
• Flammability: 2-EHA is flammable and should be kept away from open flames, sparks, or heat sources during storage and use.
• Toxicity: Although 2-EHA is not highly toxic, prolonged or excessive exposure (particularly via inhalation or ingestion) could cause respiratory or gastrointestinal discomfort. Adequate ventilation should be maintained when using it in industrial settings.
• Environmental Impact: 2-EHA and its derivatives should be handled with care to prevent spillage into water systems. While it is biodegradable, large quantities could still pose a risk to aquatic life and ecosystems if released improperly.

Industrial Handling

• Storage: 2-EHA should be stored in tightly sealed containers in a cool, dry, well-ventilated area away from sources of heat or ignition. It should be protected from contamination to maintain its stability.
• Transportation: It should be transported in compliance with hazardous material regulations, as it is classified as a flammable liquid. Proper labeling, handling, and documentation are required during transportation.

Price of 2-EHA

The price of 2-Ethylhexanoic Acid can vary depending on factors such as quantity, supplier, and regional market conditions. Bulk purchases (like industrial or large-volume quantities) typically range from $2,000 to $5,000 per metric ton. Smaller quantities may cost $4 to $10 per liter, depending on the grade and supplier.

Conclusion

2-Ethylhexanoic Acid (2-EHA) is a versatile chemical used extensively in the manufacture of plasticizers, metal salts, lubricants, and solvents. Its solvency, low freezing point, and ability to produce various esters and salts make it valuable in many industrial processes, particularly in the PVC and polymer industries. However, it should be handled with care due to its flammability and potential to irritate the skin and eyes.