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Calcium Alkyl Salicylate Detergent — TBN 100-350
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Calcium Alkyl Salicylate - Detergent
cas 824-35-1
Description：
Factory-direct calcium alkyl salicylate detergent. CAS 824-35-1. TBN 100-350, four grades. Best thermal stability of sulfonate/phenate/salicylate. For HDEO, marine, gas engine oils. Request TDS/MSDS.
Category：
Detergents & TBN Booster
Product Details
Quick Specs
| CAS Number | 824-35-1 |
| Metal Content | Calcium |
| TBN Range | <100 to 350 mgKOH/g (4 grades) |
| Available Grades | Low base / T109A(TBN~150) / T109B(TBN~280) / Super overbased(TBN~350) |
| Packaging | 200 kg metal drum / 1000 kg IBC tote |
| MOQ | 1 drum / 1 IBC |
| Lead Time | 7–15 days after order confirmation |
What is Calcium Alkyl Salicylate?
The detergent with the best thermal stability in the engine oil additive toolbox. Phenates are good. Sulfonates are good. When sump temperatures push past the point where sulfonate and phenate micelles destabilize, salicylate is usually still working.
The chemistry: alkylphenol + CO2 under the Kolbe-Schmitt reaction introduces a carboxyl group ortho to the phenolic -OH. The result is alkyl salicylic acid. Neutralize with calcium hydroxide. Overbase with CaCO3 to the target TBN. The calcium cation forms a six-membered chelate ring bridging the carboxyl and phenolic oxygens. This chelated structure is more thermally stable than the simple ionic sulfonate bond or the partially ionic phenate bond. And residual phenol functionality — inherent to the Kolbe-Schmitt synthesis — gives the detergent built-in antioxidant and corrosion-inhibiting properties that sulfonates lack entirely.
The alkyl chain length and branching control oil solubility. C16–C24 chains with moderate branching give the best balance of solubility and detergent performance. Too short and the detergent crashes out. Too long and the polar salicylate head group gets diluted by the tail.
Product Grades
Full TBN spectrum — low base through super-overbased. One chemistry, four alkalinity levels.
| Grade | TBN (mgKOH/g) | Type | Key Applications |
|---|---|---|---|
| Low Base | <100 | Neutral/Low overbased | Corrosion inhibition, friction modification |
| T109A | ~150 | Medium base | Balanced detergency, light engine oils |
| T109B | ~280 | High base | HDEO, marine, gas engine — workhorse grade |
| Super Overbased | ~350 | Super overbased | Marine cylinder oils, high-sulfur HFO |
Not sure which grade? T109B (TBN ~280) is the standard starting point for most engine oil and industrial formulations. Need maximum TBN for marine HFO? Super overbased (~350). Need only corrosion protection? Low base (<100). Contact our technical team for a recommendation →
Structure & Chemistry
Six-Membered Calcium Chelate Ring
Calcium bridges the carboxyl oxygen and phenolic oxygen in a six-membered chelate structure. This is more thermally stable than the ionic sulfonate bond or partially ionic phenate bond. The chelate is the structural reason salicylates survive higher sump temperatures.
Kolbe-Schmitt Synthesis
Alkylphenol + CO2 at elevated temperature and pressure. The carboxyl group is introduced ortho to the -OH — this regiochemistry creates the chelate. Para substitution would give a different isomer with different properties entirely.
Built-in antioxidant — the bonus feature:
The Kolbe-Schmitt reaction does not convert every alkylphenol molecule to alkyl salicylic acid. A small fraction of residual alkylphenol remains — and this residual phenol functionality gives the finished detergent antioxidant and corrosion-inhibiting properties. Sulfonate detergents have no equivalent functionality. Phenates acquire antioxidant function through sulfur bridging during manufacture — a different route to a similar end. Salicylates get it naturally from the synthesis chemistry.
Key Features
Best Thermal Stability of the Three
Calcium chelate structure survives temperatures where sulfonate micelles begin to destabilize. The primary reason formulators choose salicylate for high-temperature gas engine and marine applications.
Built-in Antioxidant & Corrosion Inhibition
Residual phenol from Kolbe-Schmitt synthesis provides antioxidant and corrosion-inhibiting function built into the detergent. Sulfonates lack this entirely. Reduces primary AO demand in the finished oil.
Soap Contributes to TBN
Unlike sulfonates where only the overbased carbonate neutralizes acids, salicylate soaps are Lewis bases with acid-neutralizing capacity of their own. Less carbonate per unit of TBN means a different ash/TBN ratio.
Full TBN Range (100–350)
From low-base for corrosion inhibition to super-overbased (TBN 350) for marine cylinder oils burning high-sulfur HFO. One chemistry covers the full alkalinity spectrum.
Three-Detergent Synergy
Salicylate + phenate + sulfonate = the premium three-detergent system. Each covers the others' weaknesses. Standard in top-tier marine and gas engine oils.
Kolbe-Schmitt = Quality Signal
The ortho-regiochemistry of the Kolbe-Schmitt reaction creates the chelate ring. This is what separates a properly manufactured salicylate detergent from one where the synthesis was rushed or the regiochemistry was uncontrolled.
Applications
Marine Cylinder Oils
Slow-speed two-stroke engines on HFO (0.5–3.5% S). Finished oil needs TBN 40–100. Super-overbased salicylate (TBN ~350) delivers maximum alkalinity per unit. Cylinder wall temperatures exceed 200°C — salicylate's thermal stability is critical here.
Natural Gas Engine Oils
Landfill/digester gas engines generate nitric acid from NOx during lean combustion. High combustion temperatures. Salicylate's thermal stability + built-in AO function controls the nitration-oxidation pathway better than sulfonate-only or phenate-only packages.
Heavy-Duty Diesel Engine Oils
T109B (TBN ~280) in HDEO formulations where thermal stability margins are tight — extended drain intervals, high-soot environments, high-ambient-temperature operation. Typically combined with calcium sulfonate for a complementary detergent package.
Industrial & Corrosion-Inhibiting Oils
Low-base grades (TBN <100) used primarily for corrosion inhibition and friction modification in industrial lubricants where acid neutralization is not the primary function. The chelated calcium structure provides a protective surface film.
Compatibility & Blending
Synergistic. Salicylate = thermal stability + AO. Sulfonate = dispersion + bulk alkalinity. Complementary pairing for engine oils.
Three-detergent system: salicylate + phenate + sulfonate for premium marine and gas engine formulations.
Standard engine oil pairing. Detergent + dispersant = ~45–50% of total additive volume.
ZDDP & Antioxidants
Compatible. Salicylate's built-in AO reduces primary AO demand. Monitor total sulfated ash from detergent + ZDDP.
Base Oils
Group I, II, III mineral oils. Standard carrier oil for additive packages. Pre-diluted grades available for easier blending.
Not Compatible With
Strong acids (consume TBN). Extended water exposure.
Synonyms & Regulatory Information
| Common Name | Calcium Alkyl Salicylate |
| CAS Number | 824-35-1 |
| Synonyms | Alkyl salicylate calcium, Calcium alkylsalicylate, Calcium long-chain alkyl salicylate, Salicylate detergent, Overbased calcium salicylate |
| HS Code | 3811.21 |
| REACH | Registered |
Documentation
| Document | Description | Download |
|---|---|---|
| Technical Data Sheet (TDS) | Complete specifications for calcium alkyl salicylate | Download PDF |
| Material Safety Data Sheet (MSDS) | Safety, handling, storage information | Request via Email |
| Certificate of Analysis (COA) | Batch-specific quality test results | Request via Email |
Frequently Asked Questions
Ready to Evaluate Calcium Alkyl Salicylate?
Free 1 kg samples within 3 working days. Tell us your target TBN and application.
Request Free Sample & TDS ⟶Last updated: May 6, 2026
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Key word：
Calcium Alkyl Salicylate
calcium alkyl salicylate
Super Overbased Calcium Alkyl Salicylate
High Base Alkyl Calcium Salicylate T109B
Calcium branched alkyl phenate sulphide
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