Overview
Hydroxyethylmorpholine (HEMO) is an organic compound combining morpholine and ethanol structural elements. As a bifunctional molecule containing both hydroxyl and amine groups, it serves as a valuable intermediate in specialty chemical synthesis. The compound was first developed in the mid-20th century and has gained importance in pharmaceutical manufacturing due to its ability to modify drug solubility and bioavailability. Industrial production typically involves the reaction of morpholine with ethylene oxide under controlled conditions. Modern purification techniques ensure high-purity grades (≥98%) suitable for sensitive applications like drug formulation. Its unique structure enables diverse reactivity patterns, making it adaptable to multiple industrial processes.
Physical and Chemical Properties
Hydroxyethylmorpholine exhibits characteristic properties of both alcohols and secondary amines. The presence of the hydroxyl group (-OH) enhances its water solubility (>500 g/L at 20°C), while the morpholine ring contributes to its organic solvent compatibility. The compound's pKa of approximately 7.5 makes it a weak base that can form stable salts with acids. Thermal analysis shows good stability up to 200°C, beyond which decomposition occurs. Its viscosity ranges from 10-15 cP at 25°C, similar to light machine oils. The surface tension measures about 38 dynes/cm, explaining its effectiveness as a wetting agent in coating formulations. These balanced properties make it particularly useful in systems requiring both hydrophilic and lipophilic characteristics.
Main Applications
In pharmaceuticals, HEMO serves as a building block for contrast agents and solubility enhancers in injectable formulations. Approximately 60% of production supplies the drug industry, where it modifies active compounds' physicochemical properties. The chemical's chelating ability also makes it effective in metalworking fluids as a corrosion inhibitor at 0.5-2% concentrations. The personal care sector utilizes hydroxyethylmorpholine in hair conditioning products (3-8% in leave-on treatments) due to its substantivity to keratin. In polyurethane production, it acts as a reactive catalyst (0.1-0.5% loading) that becomes incorporated into the polymer matrix, eliminating catalyst leaching concerns. Emerging applications include gas treatment solvents and electronic chemicals for semiconductor manufacturing.
Safety and Storage
Classified as harmful if swallowed (H302) and causes serious eye irritation (H319) under GHS standards. Engineering controls should include local exhaust ventilation and closed system handling. Spills should be contained with inert absorbents like vermiculite, never rinsed to drains. Firefighters require alcohol-resistant foam for combustion incidents (flash point 110°C). Proper storage involves stainless steel or polyethylene containers with nitrogen blanketing to prevent moisture absorption. Shelf life typically exceeds two years when stored below 30°C. Incompatible materials include strong oxidizers, acid chlorides, and reactive metals. Transport regulations classify it as UN number 2735 (amines, liquid, corrosive, n.o.s.), packing group III.
B2B Procurement Guide
Pharmaceutical buyers should insist on DMF-filed material with full analytical documentation including residual solvent profiles. Industrial-grade purchases (for coatings or lubricants) can consider 95% purity to reduce costs by 15-20%. Asian suppliers dominate production, but European sources offer tighter batch-to-batch consistency. Key supplier qualifications include ISO 9001 certification, REACH compliance, and ability to provide stability data. Tanker deliveries (≥5 metric tons) typically offer 8-12% cost savings versus drum shipments. Negotiate testing protocols - HPLC purity verification is standard, while heavy metal screens (As, Pb, Hg ≤10 ppm) may carry premium pricing. Sample evaluation should assess color (APHA ≤50 preferred) and water content (≤0.5%).
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