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D1569-05 – Standard Test Method Technical Guide
The ASTM D1569-05 standard, reapproved in 2014, is issued under fixed designation D1569 and provides standard test methods for evaluating detergent alkylate. These methods are under the jurisdiction of ASTM Committee D12 on Soaps and Other Detergents and focus on alkylbenzene used in sulfonation for surfactant applications.
📐 Scope and Applicability
These test methods cover various properties of alkylbenzene pertinent to its characterization for desired uses. Detergent alkylate comprises alkylbenzenes prepared by varying processes, with varying alkyl chain configuration and length. The largest application is in detergent products after sulfonation. Careful control of alkylate characteristics is desired to avoid undesirable end-use properties due to variations in sulfonate.
⚙️ Test Methods and Procedures
The standard references several ASTM methods for specific tests, including Saybolt viscosity (D88), flash point (D92), Saybolt color (D156), kinematic viscosity (D445), aniline point (D611), acid wash color (D848), specific gravity (D891), Kauri-Butanol value (D1133), bromine number (D1159), refractive index (D1218), and water content (D1364). These methods are crucial for evaluating the alkylate’s physical and chemical properties.
| 🟦 Standard | 📏 Test Method | 🎯 Parameter Measured |
|---|---|---|
| D88 | Saybolt Viscosity | Viscosity measurement |
| D92 | Flash Point (Cleveland Open Cup) | Flammability |
| D156 | Saybolt Color | Color assessment |
| D445 | Kinematic Viscosity | Dynamic viscosity |
| D611 | Aniline and Mixed Aniline Point | Aromatic content |
| D848 | Acid Wash Color | Purity evaluation |
| D891 | Specific Gravity (Apparent) | Density |
| D1133 | Kauri-Butanol Value | Solvent power |
| D1159 | Bromine Number | Unsaturation level |
| D1218 | Refractive Index | Optical characteristics |
| D1364 | Water Content (Karl Fischer) | Moisture content |
These methods are integral to characterizing detergent alkylate and ensuring consistency across production batches.
📊 Key Measured Properties
Key measured properties include viscosity, which affects handling; flash point for safety; color for appearance; aniline point for aromatic content; acid wash color for purity; specific gravity for density; Kauri-Butanol value for solvent power; bromine number for unsaturation; refractive index for optical properties; and water content for moisture levels. Each property contributes to the overall quality of the detergent alkylate.
💡 Note: The standard recommends careful control of alkylate characteristics to prevent variations in sulfonate that could lead to undesirable end-use properties.
⚠️ Safety: Users should establish appropriate safety and health practices and review Section 4 for specific hazard statements before conducting tests.
❓ Frequently Asked Questions
🔍 What is detergent alkylate?
Detergent alkylate consists of alkylbenzenes prepared by various processes, with varying alkyl chain configurations and lengths. It is sulfonated for use in surfactant and detergent products.
💡 Why is the aniline point measured?
The aniline point and mixed aniline point are measured to indicate the aromatic content and solvent properties of the alkylate, which are critical for sulfonation behavior and end-use performance.
⚡ How is bromine number determined?
Bromine number is determined using ASTM D1159, which involves electrometric titration to measure the unsaturation level in petroleum distillates and commercial aliphatic olefins.
📌 What reagent purity is required?
All reagents should be reagent grade chemicals conforming to the specifications of the Committee on Analytical Reagents of the American Chemical Society, or of sufficient purity to maintain test accuracy.