Ethanol Absolute CAS 64-17-5

Introduction to Ethanol Absolute

Ethanol Absolute is a highly purified aliphatic alcohol consisting of a two-carbon chain with a terminal hydroxyl group. The molecular structure provides a balanced hydrophilic and lipophilic profile, allowing the liquid to mix completely with water and dissolve a vast array of non-polar organic compounds. The material exists as a colorless, volatile liquid with a characteristic wine-like odor at room temperature. It absorbs moisture rapidly from the atmosphere.

Key Features of Ethanol Absolute

• Hydroxyl functionality: Participates in hydrogen bonding, enabling the dissolution of polar resins, alkaloids, and essential oils.
• Low moisture content: Prevents unwanted hydrolysis in moisture-sensitive chemical reactions and anhydrous formulations.
• High volatility: Evaporates cleanly at room temperature without leaving residual films or impurities on substrates.

Ethanol Absolute Chemical & Physical Properties

Applications of Ethanol Absolute

Pharmaceutical and botanical extraction: Used as the primary solvent for extracting active alkaloids and flavonoids from plant matter. The anhydrous nature prevents the degradation of moisture-sensitive APIs. Formulators frequently blend the final botanical extracts with macromolecular hydrators like Sodium Hyaluronate to stabilize topical serums and enhance skin penetration.

Medical and industrial disinfectants: Formulated into surface sanitizers and skin antiseptics. The alcohol denatures microbial proteins and disrupts lipid membranes upon contact. Chemists often dissolve active biocides like Chlorhexidine Gluconate into the alcohol base to create fast-acting, broad-spectrum surgical scrubs and wound cleansers.

Chemical synthesis and coatings: Acts as a reaction medium and a fast-evaporating solvent in industrial coatings and printing inks. It is frequently esterified with organic acids or blended with solvents like Ethyl Acetate to adjust the evaporation rate and improve the flow and leveling of the final coating film.

Storage & Safety Precautions for Ethanol Absolute

• Moisture exclusion: Store in tightly sealed, grounded steel or HDPE drums under a dry nitrogen blanket. The liquid is highly hygroscopic and will rapidly absorb atmospheric water, ruining its anhydrous properties.
• Flammability: Ethanol Absolute is highly flammable with a low flash point. Keep away from heat, sparks, and open flames. Ensure all transfer lines and pumps are properly grounded to prevent static discharge.
• Handling and PPE: Wear chemical splash goggles and nitrile gloves. The vapor can cause mild respiratory and eye irritation in unventilated spaces. Use local exhaust ventilation during drum decanting.
• Field note: When dispensing the liquid into dry reaction vessels, purge the receiving tank with nitrogen first. Introducing ambient air brings in humidity that can immediately trigger side reactions in moisture-sensitive Grignard or organolithium syntheses.

Ethanol Absolute FAQ

Q: How does Ethanol Absolute function in botanical extraction?

A: Ethanol Absolute penetrates plant cell walls to dissolve non-polar alkaloids and essential oils. Its ultra-low moisture content prevents hydrolysis of sensitive active ingredients. Formulators use this anhydrous solvent to maximize extraction yields and preserve final tincture stability.

Q: Why is Ethanol Absolute preferred for medical disinfectants?

A: Ethanol Absolute rapidly denatures microbial proteins and disrupts cell membranes upon contact. Its high volatility ensures the skin dries quickly without leaving sticky residues. Manufacturers blend it with biocides to create fast-acting, broad-spectrum surgical scrubs and surface sanitizers.

Q: What causes Ethanol Absolute to degrade during storage?

A: Ethanol Absolute is highly hygroscopic and rapidly absorbs atmospheric moisture, which ruins its anhydrous properties and triggers unwanted hydrolysis in sensitive reactions. To maintain ultra-low water content, store the liquid in tightly sealed drums under a dry nitrogen blanket.