Long-chain alkyl morpholine｜4-Tetradecylmorpholine, high-efficiency mining flotation collector and key raw material for oil-gas metal corrosion inhibitor

Driven by continuous development of salt-lake potassium resource exploitation, oil-gas production, metal processing and fine surfactant industries, traditional short-chain alkyl morpholines suffer from poor flotation selectivity, thin corrosion-inhibition film and easy deactivation in high-salt media, failing to satisfy harsh operating conditions of high-salinity, acidity and high temperature. Our company has achieved stable high-purity mass-production of 4-Tetradecylmorpholine (TDM). Benefiting from its unique molecular structure consisting of tetradecyl long-alkyl hydrophobic chain and morpholine heterocyclic polar head group, it delivers powerful interfacial adsorption, long-term metal corrosion inhibition and excellent mineral separation performance. It serves as a key special-purpose raw material for salt-lake potassium extraction, oil-field pipeline anti-corrosion, industrial lubricant additives and quaternary-ammonium surfactant synthesis. Bulk supply is now available for domestic salt-lake chemical, oil-gas service and fine-chemical manufacturers.

Core Product Specifications

Full Chemical Name: 4-Tetradecylmorpholine English Name: 4-Tetradecylmorpholine / N-Tetradecylmorpholine CAS No.: 25727-93-9 Molecular Formula: C₁₈H₃₇NO Molecular Weight: 283.49 Appearance: Pale yellow transparent oily liquid Purity: ≥95% Density: 0.874 g/cm³ Boiling Point: 170 °C (4 mmHg, reduced pressure) Flash Point: 108 °C Key Characteristics: Long hydrophobic carbon chain, heterocyclic polar adsorption group, high-salt resistance, weak-acid resistance, easy film-forming property, quaternizable for modification

Core Differentiated Advantages

1. Extra-long tetradecyl alkyl chain for greatly enhanced hydrophobic adsorption 

The long tetradecyl carbon chain endows the molecule with strong hydrophobicity. It rapidly orients and adsorbs onto mineral / metal surfaces in high-salt pulp and oil-water two-phase systems. Compared with dodecyl morpholine, its sodium-removal flotation efficiency improves by over 10 %. The anti-corrosion protective film is denser with superior scouring resistance and long-term stability.

2. Morpholine oxygen-containing heterocyclic structure integrating corrosion inhibition and mineral separation

The polar N-O heterocyclic group enables nitrogen atoms to form coordination protective films on metal surfaces and suppress acid-alkali corrosion. Meanwhile, it exhibits selective adsorption toward sodium-chloride crystals, precisely removing sodium-salt impurities during potash reverse flotation with potassium recovery rate above 95 %.

3. High-salt tolerance and wide pH adaptability, stable performance under complex conditions 

It maintains long-term activity in saturated brine and weak-acid environments. Compatible with high-salt salt-lake pulp and acidic oilfield produced fluid, free of precipitation or deactivation under high-ionic-strength conditions, fit for continuous industrial production processes.

4. Derivatizable for synthesis of high-end cationic surfactants

The tertiary-amine site can undergo quaternization reaction to produce tetradecyl morpholinium quaternary ammonium salts, which can be used as antibacterial agents, flexible emulsifiers and mining Gemini collectors. One single raw material supports both basic additives and high-end derivative product lines.

5. Low dosage for lower comprehensive application cost

 Lower loading is required in flotation and corrosion-inhibition formulations compared with short-chain alkyl morpholines. Reduced chemical consumption mitigates downstream wastewater-treatment burden and cuts overall production cost for end-users.

Five Core Application Fields

1.Salt-Lake Potash Reverse-Flotation Collector (Primary High-End Application) 

Core special reagent for sodium removal from carnallite and potash ores:

· Selectively adsorbs on sodium-chloride crystal surfaces to realize efficient potassium-sodium separation; sodium-chloride impurity content in concentrate is kept below 2 %;

· Outstanding stability in high-salt ore pulp with moderate foam for easy defoaming, improving continuous-production efficiency of salt-lake potash fertilizer;

· Substitutes imported long-chain alkyl morpholines and substantially reduces procurement cost of salt-lake beneficiation reagents.

2.High-Efficiency Corrosion Inhibitor for Oil-Gas Production Pipelines

Acid-resistant additive for oil-field gathering-transport pipelines and down-hole equipment:

· Forms dense hydrophobic protective films on steel substrates to resist corrosion by CO₂ and H₂S acidic media and extend pipeline service life;

· Uniformly dispersible in oil-water two-phase systems for complex coexisting crude-oil and formation-water conditions, with auxiliary demulsification performance.

3.Anti-Rust & Lubricating Additive for Metalworking Fluids 

Special anti-rust component for cutting fluids, rolling oils and industrial cleaning solutions:

· Universal multi-metal corrosion inhibition providing long-term rust protection for carbon steel, cast iron and aluminum alloys;

· Intrinsic bacteriostatic property reduces biocide dosage, extends service cycle of working fluids and lowers waste-liquid discharge.

4.Fine-Chemical Intermediate — Raw Material for Quaternary-Ammonium Surfactants

Tetradecyl morpholinium quaternary ammonium salts synthesized via quaternization:

· Used for manufacturing mining Gemini collectors, broad-spectrum industrial bactericides and textile softening emulsifiers;

· Suitable for synthetic routes of various high-end cationic additives in water treatment, daily-chemicals and mineral flotation sectors.

5.Auxiliary Additive for Industrial Anti-Corrosion and Coatings 

Wetting additive for water-borne anti-rust coatings and oil-gas pipeline anti-corrosion coatings. Enhances adhesion between paint film and metal substrate and improves salt-spray resistance of coatings.

Product Supply & Industry Value

Domestic demand for home-grown long-chain alkyl morpholine keeps rising in salt-lake potash-fertilizer and oil-gas anti-corrosion industries. Leveraging mature alkylation synthetic technology, 4-Tetradecylmorpholine achieves stable mass-production with controllable purity and carbon-chain distribution. Industrial-grade standard liquid and custom purified grades are available. Free sample testing for flotation / corrosion-inhibition performance as well as formulation-process technical support are provided.

This product can fully replace imported alkyl morpholine reagents, advancing domestic substitution for salt-lake chemical and oil-gas anti-corrosion industrial chains and lowering raw-material procurement and operation-maintenance costs for downstream manufacturers.