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Ethanolamine hydrochloride, with the molecular formula C₂H₈ClNO and CAS registry number 2002-24-6, normally appears as a white crystalline solid powder under normal ambient conditions. The particle size, crystal shape and particle size distribution of this solid powder exert a direct influence on its dissolution rate, uniform dispersibility and chemical reactivity when applied in diverse industrial scenarios.
This compound dissolves readily in pure water as well as several polar organic solvents, including anhydrous ethanol and methanol. Serving as a functional catalyst and processing additive within the petroleum and natural gas industry, it takes part in multiple refining and purification procedures of crude oil and natural gas resources. The addition of this substance effectively lifts the extraction yield and finished product quality of oil and gas products, better satisfying the growing social demand for stable energy supply. Apart from energy manufacturing, it also gains widespread utilization in the production of industrial cleaning agents and surfactants. When formulated as a key component of detergents and surface active agents, it significantly enhances the overall cleaning performance and long-term storage stability of the final commercial products.
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Chemical Properties and Structure
Ethanolamine hydrochloride is the hydrochloride salt of ethanolamine (2-aminoethanol), a primary aliphatic amine with a hydroxyl group attached to the β-carbon.The compound crystallizes as a white powder or crystalline solid, exhibiting a melting point range of 82–86°C and a boiling point of 170.9°C at 760 mmHg. Its solubility in water is notable, facilitating its use in aqueous solutions for various applications.
The compound's structure consists of a two-carbon chain with an amino group (-NH₂) and a hydroxyl group (-OH), which contribute to its amphiprotic nature-acting as both an acid and a base.The presence of the chloride ion (Cl⁻) in ethanolamine-hydrochloride enhances its stability and solubility compared to its freebase form. The hydrogen bonding capacity of the amino and hydroxyl groups enables strong interactions with water molecules, explaining its high solubility. Additionally, the compound's vapor pressure (0.458 mmHg at 25°C) and flash point (93.3°C) indicate moderate volatility and flammability, necessitating careful handling during industrial processes.
Synthesis Methods
Ethanolamine hydrochloride is synthesized through the reaction of ethanolamine with hydrochloric acid (HCl). The process typically involves the following steps:
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Alternative methods include the use of gaseous hydrogen chloride (HCl) for direct protonation of ethanolamine, followed by crystallization and drying. The choice of synthesis route depends on factors such as yield, purity requirements, and cost-effectiveness.
Industrial Applications
Ethanolamine hydrochloride's versatility stems from its ability to participate in various chemical reactions, including nucleophilic substitution, condensation, and hydrogen bonding. Its applications span multiple industries:
One of the most significant industrial uses of ethanolamine-hydrochloride is in the removal of acidic gases, such as carbon dioxide (CO₂) and hydrogen sulfide (H₂S), from natural gas and refinery streams. Although ethanolamine itself is more commonly used in its freebase form for gas sweetening, its hydrochloride salt serves as a precursor or intermediate in the synthesis of specialized amines tailored for specific gas treatment applications. The amino group in ethanolamine-hydrochloride reacts with acidic gases to form stable carbamates or sulfides.
Ethanolamine-hydrochloride is a key raw material in the manufacture of nonionic surfactants, such as alcohol ethoxylates and amine oxides. These surfactants are widely used in detergents, personal care products, and industrial cleaners due to their excellent emulsifying, foaming, and wetting properties. The hydroxyl group in ethanolamine-hydrochloride facilitates etherification reactions with ethylene oxide, leading to the formation of polyethoxylated derivatives with enhanced surface activity.
In the pharmaceutical sector, ethanolamine-hydrochloride serves as a building block for the synthesis of various drugs and active pharmaceutical ingredients (APIs). For example, it is used in the production of antihistamines, local anesthetics, and muscle relaxants. The compound's ability to form stable salts with basic drugs improves their solubility, stability, and bioavailability, making it an ideal excipient in drug formulation. Additionally, ethanolamine-hydrochloride is employed as a buffering agent to maintain pH stability in pharmaceutical solutions and injectables.
Ethanolamine-hydrochloride serves as a vital intermediate reagent that performs key synthetic functions during the manufacturing process of various agrochemical products, including insecticidal pesticides, selective herbicides and bioactive plant growth regulators. Its inherent chemical reactivity towards different chlorinated organic compounds facilitates the controllable synthesis of stable organophosphorus pesticides, a category of agrochemicals that deliver reliable insecticidal activity against a broad and diverse spectrum of agricultural pests and harmful larvae. Furthermore, this compound carries inherent mild surfactant properties.
Safety and Handling
Ethanolamine-hydrochloride is classified as an irritant, with potential health hazards associated with skin, eye, and respiratory tract exposure. The compound's safety data sheet (SDS) indicates that it can cause severe irritation upon contact, leading to redness, pain, and burns. Inhalation of dust or vapors may result in respiratory distress, coughing, and shortness of breath, while ingestion can cause gastrointestinal irritation, nausea, and vomiting.To ensure safe handling, the following precautions are recommended:
- Personal Protective Equipment (PPE): Wear chemical-resistant gloves, goggles, and a lab coat or protective clothing to minimize skin and eye exposure.
- Ventilation: Use local exhaust ventilation or fume hoods to maintain airborne concentrations below recommended exposure limits.
- Storage: Store ethanolamine-hydrochloride in a cool, dry, and well-ventilated area, away from incompatible substances such as oxidizing agents and strong acids.
- Spill Response: In case of spills, contain the material using inert absorbents and dispose of it according to local regulations. Avoid direct contact with the spilled substance and use appropriate PPE during cleanup.
Market Expansion: Driven by Diversified Demand
Pharmaceutical Sector: Precision Medicine and Biotech Boom
The pharmaceutical industry remains a primary consumer of ethanolamine-hydrochloride, utilizing it as a buffering agent, intermediate, and catalyst in drug synthesis. With the global precision medicine market projected to grow at a CAGR of 10.2% through 2030, demand for high-purity ethanolamine-hydrochloride will surge. For instance, its role in synthesizing antiviral drugs and neuroregulators is critical, as seen in the production of compounds targeting neurological disorders. Additionally, biotech firms are leveraging its ionic exchange properties to develop novel drug delivery systems.
Cosmetics and Personal Care: Clean Beauty and Functional Ingredients
The clean beauty movement, valued at $54 billion globally in 2025, is reshaping ingredient sourcing. Ethanolamine-hydrochloride's pH-regulating and emulsifying properties make it indispensable in shampoos, lotions, and serums. Brands like L'Oréal and Estée Lauder are reformulating products to replace harsher chemicals with ethanolamine derivatives, aligning with consumer preferences for "free-from" labels. By 2030, the Asia-Pacific region, particularly China and South Korea, will dominate this segment due to rising disposable incomes and regulatory support for sustainable ingredients.
Agriculture: Smart Farming and Crop Protection
Ethanolamine-hydrochloride enhances pesticide efficacy by improving adhesion to plant surfaces and penetration into tissues. With the global agricultural chemicals market expected to reach $300 billion by 2027, its use in biopesticides and herbicides will expand. For example, Syngenta and Bayer are integrating ethanolamine-based adjuvants into precision agriculture tools, enabling farmers to reduce chemical usage by 30% while maintaining yields. This aligns with the EU's Farm to Fork Strategy, which mandates a 50% reduction in pesticide use by 2030.
Industrial Applications: Green Chemistry and Energy Transition
In the industrial sector, ethanolamine-hydrochloride is pivotal in gas treatment (e.g., CO₂ capture) and surfactant synthesis. As nations commit to net-zero emissions, its role in carbon capture technologies will grow. National Energy Group's 400MW photovoltaic-hydrogen project in China, which uses ethanolamine derivatives for CO₂ scrubbing, exemplifies this trend. Additionally, the rise of bio-based surfactants-projected to capture 25% of the $45 billion market by 2030-will drive demand for ethanolamine-hydrochloride as a sustainable alternative to petroleum-derived compounds.
Challenges and Mitigation Strategies
Raw Material Volatility: Ethanolamine-hydrochloride production relies on ethylene and ammonia, whose prices fluctuate with oil markets. To mitigate risks, producers are diversifying feedstocks. For example, Saudi Aramco's "Blue Ammonia" project, which captures CO₂ during production, provides a stable supply for Middle Eastern ethanolamine plants. Similarly, bio-ethylene from sugarcane, used by Brazil's Braskem, reduces exposure to fossil fuel markets.
Competition from Alternatives: Substitutes like amino methyl propanol (AMP) and triethanolamine (TEA) are gaining ground in niche applications. To differentiate themselves, ethanolamine-hydrochloride suppliers are emphasizing their compound's superior biodegradability and lower toxicity. For instance, Clariant's "Hostapon" line, which replaces TEA in detergents, has captured 12% of the European market since its 2023 launch.
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Infrastructure Gaps in Emerging Markets
Ethanolamine-hydrochloride's versatility stems from its dual functionality as a nucleophile and pH regulator, enabling applications across high-value industries. From life-saving drugs to sustainable energy solutions, its role continues to expand through innovations in green chemistry and nanotechnology. As regulatory pressures and sustainability goals reshape manufacturing, the compound's adaptability ensures its relevance in the next decade of scientific and industrial advancement.
While Asia-Pacific leads growth, inadequate storage and transportation networks hinder distribution. To address this, companies like China's COFCO are investing in modular ethanolamine plants near consumer hubs, reducing logistics costs by 30%. Similarly, partnerships between Indian producers and logistics firms like DHL ensure just-in-time delivery to pharmaceutical clients.Ethanolamine-hydrochloride is a multifaceted compound with a wide range of applications across science and industry.Its unique chemical properties, including water solubility, reactivity, and biological compatibility, make it an indispensable component in gas treatment, surfactant production, pharmaceuticals, agriculture, and polymers.
However, its potential health and environmental hazards necessitate careful handling and disposal. As research continues to uncover new applications and sustainable synthesis methods, ethanolamine-hydrochloride is poised to play an even more significant role in advancing technology and improving quality of life. By understanding its properties, applications, and safety considerations, scientists and engineers can harness the full potential of this versatile compound while minimizing its impact on human health and the environment.
references
Smith T D, Gerken J B, Jog P V, Roberts J D. Conformational Equilibria of Ethanolamine and Its Hydrochloride in Solution[J]. Organic Letters, 2007, 9(22): 4555-4557. DOI:10.1021/ol7020077
Fiume M M, Heldreth B. Final Amended Report On the Safety Assessment of Ethanolamine and Ethanolamine Salts as Used in Cosmetics[R]. Washington DC: Cosmetic Ingredient Review Expert Panel, 2012.
BenchChem Technical Team. Optimizing EthanolamineHydrochloride Concentration in Protein Extraction Buffers: Application Notes and Protocols[Z]. BenchChem Internal Technical Document, 2025.
Li S L, Yan J, Zhang Y Q, et al. Niclosamide ethanolamine inhibits artery constriction[J]. Pharmacological Research, 2017, 115:78-86. PMID:27840237.
FAQ
Q1: What is ethanolamine-hydrochloride, and what core physical and chemical properties does it possess?
Ethanolamine-hydrochloride (CAS 2002-24-6), also named 2-Aminoethanol hydrochloride, is a white or off-white hygroscopic crystalline solid with molecular formula C₂H₈ClNO and molecular weight 97.54. It dissolves freely in water, shows limited solubility in low-polar organic solvents, and has a pKa value of 9.5 at 25°C, making it a mild biological buffer. The compound remains stable under sealed dry conditions at room temperature, yet it easily absorbs moisture from air to form agglomerates, so moisture isolation is required for long-term storage.
Q2: What are the mainstream application scenarios of ethanolamine-hydrochloride across industries?
It covers biochemical research, pharmaceutical synthesis, cosmetic formulation and industrial chemical processing. In life science labs, it is widely configured into cell culture media and protein extraction buffers to stabilize pH and maintain normal cell membrane lipid metabolism. For pharmaceuticals, it acts as a key synthetic intermediate for amine-based APIs and a solubilizing excipient to improve the solubility of poorly soluble active ingredients. In cosmetics, it functions as a mild pH regulator and auxiliary emulsifier. Industrially, it serves as a metal corrosion inhibitor and absorbent to remove acid gases like CO₂ from raw natural gas.
Q3: What safety risks exist during handling ethanolamine hydrochloride, and what storage precautions should be followed?
Ethanolamine-hydrochloride is classified as a mild irritant under GHS standards; direct contact may trigger skin dryness, eye stinging and mild respiratory discomfort if inhaled as dust. It carries low acute oral toxicity but should never be ingested intentionally. Operators need to wear protective gloves and goggles during weighing and dissolution, and wash exposed skin thoroughly with running water after operation. For storage, the product must be tightly sealed in HDPE containers, placed in cool, dry environments away from humidity and strong oxidants, with a shelf life of around 3 years under compliant storage conditions.
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