Alkenyl succinate are a class of esters derived from succinic acid and an alkenyl group. They are formed by the reaction of an alkenyl alcohol with succinic acid. These compounds readily react with amines and amides to form different products, depending on the type of amine or amide used. Common uses include surfactants, adhesives, and lubricants in a variety of industries.
Table of Contents
Synthesis
Alkenyl succinate are produced by a thermal esterification reaction between an alkenyl alcohol and succinic acid. The reactants are typically heated in the presence of a catalyst such as p-toluenesulfonic acid or anhydrous zinc chloride, for a period of time at a temperature of 80-200°C depending on the type of alkenyl alcohol used.
Properties
Alkenyl succinates are slightly viscous liquids with excellent solubility in water and other organic solvents. They have relatively low vapor pressure and flash points, and can be used as a lubricant or thermal stabilizers for other compounds.
Uses
Alkenyl succinates are used as surfactants and emulsifiers in a variety of industries. They are commonly used in the production of lubricating oils, adhesives, paints, and other similar products.
Because of their low vapor pressure, alkenyl succinates can also be used as thermal stabilizers in many applications.
Safety
Alkenyl succinates are readily biodegradable and not considered to be acutely toxic. They do not bioaccumulate and have relatively low EC50 values.
The anti-rust performance of this product is equivalent to that of T746, but it has low acid value. It has good fluidity, good oil solubility, can form a protective film on the metal surface to prevent corrosion and rust on the metal surface and form a dense oil film with the metal. It is excellent anti-rust agent with good performance .
This product is used as a kind of anti-rust additive for industrial lubricants such as turbine oil,machine tools oil, hydraulic oil and gear oil, especially suitable for the preparation of turbine oil and hydraulic oil with lower acid value.
🧪 What Is Alkenyl Succinic Anhydride (ASA)?
Alkenyl succinates, especially Alkenyl Succinic Anhydrides (ASA), are a family of oil-soluble chemical compounds used widely in lubricants, fuels, and coolants as:
- Dispersants
- Corrosion inhibitors
- Detergency boosters
- Additive intermediates
🧬 Basic Structure:
Where R = long-chain alkenyl group (e.g., C12–C30)
It’s basically maleic anhydride reacted with an alpha-olefin (like dodecene, hexadecene, etc.).
⚙️ Key Functions in Lubricants:
| Function | Description |
|---|---|
| Dispersant precursor | Reacted with polyamines or polyols to form ashless dispersants (like PIBSA) |
| Corrosion inhibition | Inhibits rusting in coolants or metal-contact systems |
| Metal surface adhesion | Strong adsorption on metal surfaces helps protect and clean |
| Viscosity modifier carrier | Used as an anchor in viscosity index improvers |
🔧 Applications:
- Engine oils (as part of PIBSA-based dispersants)
- Hydraulic fluids
- Greases
- Fuel additives
- Metalworking fluids
- Coolants (as corrosion inhibitors)
🏭 How Alkenyl Succinates Are Made:
Reaction:
Maleic anhydride + Alpha-olefin → Alkenyl succinic anhydride (ASA)
(Typically via thermal ene reaction at 180–250°C)
If the olefin is polyisobutylene (PIB), the result is PIBSA, a key component in ashless dispersants.
📋 Example Variants:
| Type | Description | Use |
|---|---|---|
| C12–C18 ASA | Shorter chain | Coolants, corrosion inhibitors |
| C20–C30 ASA | Longer chain | Lubricant dispersant intermediates |
| PIBSA | Polyisobutenyl succinic anhydride | Used in heavy-duty engine oils |
🧪 Physical Properties:
| Property | Typical |
|---|---|
| Appearance | Amber liquid or viscous oil |
| Solubility | Oil-soluble |
| Acid number | 100–150 mg KOH/g |
| Density | ~0.95–0.98 g/cm³ |
| Viscosity | Depends on R group size |
🧰 Commercial Brands:
- Chevron OSA (Octenyl succinic anhydride)
- Lubrizol ASA intermediates
- Infineum, Afton, Oronite – use ASA chemistry in dispersant packages