Cyclohexylamine carbonate
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Product Description
Cyclohexylamine carbonate, also known as cyclohexylammonium hydrogen carbonate, is a crystalline compound. It is formed by the reaction of cyclohexylamine and carbonic acid in a 1:1 ratio, resulting in a bicarbonate salt structure. Cyclohexylamine carbonate is typically a white, crystalline solid that is soluble in water and common organic solvents. It has a melting point around 110–120 °C and is relatively stable, though it may decompose upon heating to release carbon dioxide. Cyclohexylamine carbonate is primarily used as a corrosion inhibitor in boiler water treatment systems, where it neutralizes acidic carbon dioxide and protects metal surfaces. It also serves as a chemical intermediate and pH regulator in various industrial applications, including the synthesis of pharmaceuticals, dyes, and rubber chemicals.
Analytical Identifiers
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InChI: InChI=1S/C6H13N.CH2O3/c7-6-4-2-1-3-5-6;2-1(3)4/h6H,1-5,7H2;(H2,2,3,4)
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InChIKey: GTLQZNKUEFUUIS-UHFFFAOYSA-N
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SMILES: C1CCC(CC1)N.C(=O)(O)O
Practical Tips
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Product Verification: Always confirm the CAS number and supplier product name/CoA/SDS before purchase or use.
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Data Accuracy: For precise melting points, crystalline forms, or spectroscopic data, request the supplier’s CoA and spectral data or check primary literature/analytical database entries.
Synthesis Methods
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Laboratory Method: Bubble CO₂ into a solution of cyclohexylamine under controlled conditions. The amine becomes protonated and pairs with bicarbonate to form the salt.
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Industrial Method: Saturate a 15-40% solution of cyclohexylamine in solvents with carbon dioxide. The suspension is then separated to obtain cyclohexylamine carbonate and a filtrate, which is recycled for the next synthesis.
Uses
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Corrosion Inhibitor: Primary use in boiler water and steam systems in power plants and industrial settings. It volatilizes with steam, condenses throughout the system, and forms a protective film that neutralizes acidic carbon dioxide, protecting metal surfaces from corrosion.
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Chemical Intermediate: Serves as a precursor or buffering agent in the synthesis of other chemicals, including pharmaceuticals, dyes, and rubber chemicals.
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pH Regulator: Used in applications requiring a mild, organic base.
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Vapor Phase Inhibitor: Effective for Nd-Fe-B magnets in simulated atmospheric environments and under thin electrolyte layers.
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Corrosion Inhibitor for Carbon Steel: Demonstrated strong inhibition effects on carbon steel N80, particularly in suppressing anodic corrosion reactions.
Molecular Formula
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Formula: C₇H₁₅NO₃
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Molar Mass: ≈ 161.20 g/mol
Chemical Structure
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Cation: Cyclohexylammonium ion ([C₆H₁₁NH₃]⁺)
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Anion: Hydrogen carbonate ion ([HCO₃]⁻)
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Description: The compound is a bicarbonate salt formed by the reaction of cyclohexylamine with carbonic acid in a 1:1 ratio.
Physical Properties
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Appearance: White crystalline solid or colorless material
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Solubility: Soluble in water and common organic solvents (e.g., ethanol)
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Melting Point: ≈ 110–120 °C (varies slightly between sources)
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Stability: Relatively stable but may decompose upon heating, releasing CO₂ and reverting to cyclohexylamine
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pH: Forms a slightly basic solution when dissolved in water
Safety, Hazards & Handling
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Acute Hazards: Cyclohexylamine and its salts can be irritating to skin, eyes, and the respiratory tract. Free cyclohexylamine is corrosive and toxic by inhalation or ingestion.
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Personal Protective Equipment (PPE): Nitrile gloves, eye protection, lab coat, and work in a fume hood. Have emergency washing facilities available.
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Storage: Store dry in a cool place, tightly sealed. Avoid exposure to CO₂ or moisture changes if precise stoichiometry is required.
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First Aid / Spill: Remove contaminated clothing, flush skin/eyes, move to fresh air, contain spill, and absorb with inert material. Dispose according to local regulations.