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Tetrakis(hydroxymethyl)phosphonium Chloride, with the chemical formula, is a versatile organophosphorus compound primarily used as a durable flame retardant for textiles and a powerful biocide in industrial water systems.
Tetrakis(hydroxymethyl)phosphonium Chloride is an organophosphorus compound commonly used as a biocide, flame-retardant precursor, and industrial chemical intermediate, especially in textile and polymer treatments.
Tetrakis(hydroxymethyl)phosphonium Chloride contains a positively charged phosphonium center bonded to four hydroxymethyl groups, with chloride as the counterion.
CAS Number: 124-64-1
Molecular Formula: C4H12ClO4P
Molecular Weight: 190.56
EINECS Number: 204-707-7
Synonyms: Tetrakis(hydroxymethyl)phosphonium chloride, THPC, tetramethylolphosphonium chloride, tetrahydroxymethylphosphonium chloride, tetrakis(hydroxymethyl)phosphanium chloride, phosphonium tetrakis(hydroxymethyl)- chloride, phosphonium chloro-tetrakis(hydroxymethyl)-, tetrakis(hydroxymethyl)phosphochloride, phosphonium tetrakis(hydroxymethyl)-, tetrakis-(hydroxymethyl)phosphonium chloride, tetrakis-(hydroxymethyl)fosfoniumchlorid, CAS 124-64-1, C4H12ClO4P, EC 204-707-7, EINECS 204-707-7, UNII 58WB2XCF8I, DTXSID5021330, RefChem:188790, NSC-30698, NSC 30698, NSC30698, Pyroset TKC, Retardol C, Proban CC, THPC solution, tetrahydroxymethylphosphonium chloride solution, THPC solution in water, 80% THPC solution, C4H12ClO4P solution, NCI-C55061, HSDB 2923, TETRA(HYDROXYMETHYL)PHOSPHONIUM CHLORIDE;TETRAKIS(HYDROXYMETHYL)PHOSPHONIUM CHLORIDE;tetramethylolphosphonium chloride;nci-c55061;Phosphonium,tetrakis(hydroxymethyl)-,chloride;pyrosettkc;tetrakis-(hydroxymethyl)fosfoniumchlorid;tetrakis(hydroxymethyl)phosphochloride
Tetrakis(hydroxymethyl)phosphonium Chloride structure makes it highly water-soluble and chemically reactive in controlled formulations.
Tetrakis(hydroxymethyl)phosphonium Chloride is a quaternary phosphonium salt with the formula [P(CH₂OH)₄]Cl, which gives it strong interaction capability with other functional groups such as hydroxyls and amines.
Its hydroxymethyl groups allow it to participate in further reactions, especially under heat or alkaline conditions.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it useful as a reactive precursor in industrial chemistry.
In aqueous solution, Tetrakis(hydroxymethyl)phosphonium Chloride behaves as a stable, highly polar compound that can release reactive species under specific conditions, which is the basis for its antimicrobial and flame-retardant behavior.
It is often formulated into products where controlled reactivity is required.
This makes it important in functional treatment systems.
Tetrakis(hydroxymethyl)phosphonium Chloride is best described as a multifunctional phosphonium-based industrial chemical used primarily for antimicrobial protection and flame-retardant applications in treated materials.
Its value comes from its ability to chemically modify or protect surfaces and fibers.
This makes it widely used in industrial finishing processes.
Tetrakis(hydroxymethyl)phosphonium Chloride is an organophosphorus compound with the chemical formula [P(CH2OH)4]Cl.
It is a white water-soluble salt with applications as a precursor to fire-retardant materials and as a microbiocide in commercial and industrial water systems.
Tetrakis(hydroxymethyl)phosphonium Chloride can be synthesized with high yield by treating phosphine with formaldehyde in the presence of hydrochloric acid.
PH3 + 4 H2C=O + HCl → [P(CH2OH)4]Cl
The cation P(CH2OH)4+ features four-coordinate phosphorus, as is typical for phosphonium salts.
Tetrakis(hydroxymethyl)phosphonium Chloride converts to tris(hydroxymethyl)phosphine upon treatment with aqueous sodium hydroxide: [P(CH2OH)4]Cl + NaOH → P(CH2OH)3 + H2O + H2C=O + NaCl
Tetrakis(hydroxymethyl)phosphonium Chloride is widely used because it can act as a reactive precursor that forms durable, insoluble phosphorus-containing structures within treated materials, especially when combined with urea or other nitrogen-containing compounds.
These reactions create stable polymeric networks that remain fixed in the substrate.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it highly effective in durable finishing systems.
In flame-retardant chemistry, Tetrakis(hydroxymethyl)phosphonium Chloride contributes to char formation during thermal decomposition, which helps reduce flammability by creating a protective carbonaceous layer on treated materials.
This char layer slows heat transfer and oxygen access to the material.
This makes it important in fire protection applications.
As a biocidal agent, Tetrakis(hydroxymethyl)phosphonium Chloride shows antimicrobial activity by disrupting microbial cell function through interaction with cellular components, particularly in aqueous environments.
This helps prevent microbial growth on treated surfaces such as textiles or industrial systems.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it useful in hygiene-sensitive applications.
Tetrakis(hydroxymethyl)phosphonium Chloride is often used in combination with other chemicals to form durable flame-retardant systems that remain effective even after washing or mechanical stress, especially in textiles.
This long-lasting performance is critical for safety-critical materials.
This makes it valuable in textile finishing technology.
In formulation practice, it is typically handled as a water-based solution due to its high solubility and reactivity, which allows controlled application in industrial processes.
This also helps reduce handling risks compared to dry reactive powders.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it suitable for industrial-scale processing.
Tetrakis(hydroxymethyl)phosphonium Chloride is important in industrial chemistry because it can act as a phosphorus-containing reactive building block that introduces both nitrogen–phosphorus synergistic flame-retardant effects when used with suitable co-reactants.
This synergy is widely used to improve fire resistance in treated textiles and polymers.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it effective in advanced flame-retardant systems.
Tetrakis(hydroxymethyl)phosphonium Chloride can contribute to intumescent-like behavior, where the material swells and forms a protective char layer that insulates the underlying substrate from heat and oxygen.
This physical barrier is a key mechanism in reducing flame spread.
This makes it valuable in fire safety material design.
In textile finishing processes, THPC-based systems can form durable, crosslinked phosphorus-rich networks within fibers that remain fixed even after repeated washing and mechanical stress.
This durability is essential for long-term protective performance in fabrics.
This makes it important in permanent textile treatments.
Tetrakis(hydroxymethyl)phosphonium Chloride is often used in combination with nitrogen sources such as urea or amines, which enhances its flame-retardant efficiency through chemical interaction during curing or heat exposure.
These combined systems improve char yield and thermal stability.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it useful in formulation synergy engineering.
From a physical chemistry perspective, THPC is highly hydrophilic and strongly ionic in aqueous solution, which allows it to penetrate porous materials like textiles and paper effectively before reaction or fixation occurs.
Tetrakis(hydroxymethyl)phosphonium Chloride penetration ability ensures uniform distribution of the active component.
This makes it important in impregnation-based treatment systems.
Melting point: 154 °C
Boiling point: 115 °C / 760 mmHg
Density: 1.341 g/mL at 25 °C
vapor pressure: 0 Pa at 25 °C
refractive index: n20/D 1.512
form: solution
pKa: 6.05 (20 °C)
color: clear light pink or yellow-green
Water Solubility: ≥10 g/100 mL at 20 °C
BRN: 3631669
InChI: 1S/C4H12O4P.ClH/c5-1-9(2-6,3-7)4-8;/h5-8H,1-4H2;1H/q+1;/p-1
InChIKey: AKXUUJCMWZFYMV-UHFFFAOYSA-M
SMILES: P+(CO)(CO)CO.[Cl-]
LogP: -9.8
Tetrakis(hydroxymethyl)phosphonium Chloride a crystalline compound made by the reaction of phosphine, formaldehyde, and hydrochloric acid.
Tetrakis(hydroxymethyl)phosphonium Chloride has industrial importance in the production of crease-resistant and flame-retardant finishes on cotton textiles and other cellulosic fabrics.
A flame-retardant finish can be prepared from THPC by the Proban Process, in which THPC is treated with urea.
The urea condenses with the hydroxymethyl groups on Tetrakis(hydroxymethyl)phosphonium Chloride.
The phosphonium structure is converted to phosphine oxide as the result of this reaction.
[P(CH2OH)4]Cl + NH2CONH2 → (HOCH2)2P(O)CH2NHC(O)NH2 + HCl + HCHO + H2 + H2O
Tetrakis(hydroxymethyl)phosphonium Chloride reaction proceeds rapidly, forming insoluble high molecular weight polymers.
The resulting product is applied to the fabrics in a "pad-dry process".
Tetrakis(hydroxymethyl)phosphonium Chloride treated material is then treated with ammonia and ammonia hydroxide to produce fibers that are flame-retardant.
In industrial practice, Tetrakis(hydroxymethyl)phosphonium Chloride must be carefully controlled because its reactivity can lead to unwanted side reactions if pH, temperature, or storage conditions are not properly managed.
This is particularly important in long-term storage or high-temperature processing environments.
Tetrakis(hydroxymethyl)phosphonium Chloride makes process stability control essential.
Tetrakis(hydroxymethyl)phosphonium Chloride is often described in industrial chemistry as a highly functional precursor system rather than a final-use additive, because its real performance typically emerges after it reacts or is fixed into a substrate during processing.
This means its properties in solution are not the same as its properties once applied and cured.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it important in reactive finishing technologies.
In flame-retardant chemistry, Tetrakis(hydroxymethyl)phosphonium Chloride contributes to phosphorus-driven dehydration reactions during heating, which promote earlier charring of cellulose-based materials and reduce the formation of flammable volatile gases.
This shifts the thermal decomposition pathway toward solid residue formation instead of combustion.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it effective in controlling fire behavior at the chemical level.
Its hydroxymethyl groups allow Tetrakis(hydroxymethyl)phosphonium Chloride to undergo condensation reactions with nitrogen-containing compounds, forming crosslinked phosphorus–nitrogen networks that become permanently embedded in fibers or coatings.
These networks are responsible for long-term flame resistance even after repeated use.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it important in durable protective finishing.
Tetrakis(hydroxymethyl)phosphonium Chloride exhibits high ionic mobility and strong solvation, which enables deep penetration into porous substrates before reaction occurs, ensuring uniform distribution of active phosphorus species.
This penetration behavior is essential for consistent treatment performance across materials.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it valuable in impregnation-based industrial processes.
Tetrakis(hydroxymethyl)phosphonium Chloride systems are often designed to balance reactivity and stability, because the compound must remain stable during storage but still react efficiently under controlled curing conditions.
This balance is critical for industrial usability and safety.
Tetrakis(hydroxymethyl)phosphonium Chloride makes formulation control a key part of its application.
Tetrakis(hydroxymethyl)phosphonium Chloride also plays a role in reducing afterglow and smoldering behavior in treated materials, which is an important safety feature in cellulose-rich substrates like cotton.
By promoting char formation, it limits sustained combustion after ignition.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it relevant in advanced fire safety engineering.
Uses:
Flame-retarding agent for cotton fabrics.
May be used in combination with triethylolamine and urea (Roxel process) or with triethanolamine and tris(1-aziridinyl) phosphine oxide.
Tetrakis(hydroxymethyl)phosphonium Chloride has been used as a reducing agent and stabilizing ligand for the synthesis of gold nanoparticles (AuNPs) from gold(III) chloride trihydrate (HAuCl4.3H2O).
Tetrakis(hydroxymethyl)phosphonium Chloride is a tetra-functional, amine-reactive, aqueous crosslinker that can be used for tuning the properties of protein-based hydrogels for 3D cell encapsulation applications.
Tetrakis(hydroxymethyl)phosphonium Chloride is used as a flame-retardant precursor in textile finishing, where it helps reduce flammability by promoting char formation in treated fibers.
It is commonly applied to cotton and blended fabrics.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it important in textile safety engineering.
In industrial biocide applications, it is used to control microbial growth in water systems, cooling systems, and industrial process fluids, where bacterial contamination must be prevented.
It helps maintain hygiene and system efficiency.
This makes it useful in industrial microbiological control.
Tetrakis(hydroxymethyl)phosphonium Chloride textile and fabric treatment, it is used to provide durable antimicrobial and flame-resistant properties that remain effective after repeated washing cycles.
This improves safety and product longevity.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it valuable in protective textile manufacturing.
In leather and paper processing, it is used to prevent microbial degradation and improve material stability during storage and use.
Tetrakis(hydroxymethyl)phosphonium Chloride helps protect organic materials from biological damage.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it important in material preservation.
In chemical synthesis, THPC is used as a reactive intermediate for producing phosphorus-containing compounds and polymer additives, where its hydroxymethyl groups can be further modified.
This expands its use beyond direct application into chemical manufacturing.
This makes it useful in industrial organic synthesis.
Tetrakis(hydroxymethyl)phosphonium Chloride is used as a flame-retardant precursor in textile finishing systems, where it helps reduce flammability by promoting char formation and limiting flame propagation in treated fibers.
It is widely applied to cotton, cellulose-based materials, and blended fabrics.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it important in textile fire safety applications.
In antimicrobial treatments, it is used as a biocidal agent for controlling microbial growth on textiles, leather, and industrial surfaces, helping prevent odor formation and material degradation.
This improves hygiene and product lifespan.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it useful in protective material treatment.
In industrial water systems, THPC is used to control microbial contamination in cooling towers and process water systems, where biofilm formation can reduce efficiency.
It helps maintain system cleanliness and operational stability.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it important in industrial water treatment.
In paper and packaging materials, it is used to reduce microbial degradation and improve storage stability of cellulose-based products, especially under humid conditions.
This helps prevent spoilage and structural breakdown.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it valuable in packaging preservation.
In chemical manufacturing, THPC is used as a reactive intermediate for producing phosphorus-containing derivatives and polymer additives, enabling further functional material development.
Its hydroxymethyl groups allow chemical modification into other useful compounds.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it useful in industrial synthetic chemistry.
Tetrakis(hydroxymethyl)phosphonium Chloride is used as a flame-retardant precursor in textile finishing, where it helps create durable, fire-resistant fabrics by promoting char formation and reducing flammability.
It is especially used for cotton and cellulose-based textiles.
This makes it essential in protective textile engineering.
In antimicrobial applications, it is used as a biocidal treatment for textiles, leather, and industrial surfaces, helping prevent microbial growth and odor formation.
This improves hygiene and extends material lifespan.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it useful in durable hygiene protection systems.
In industrial water treatment systems, THPC is used to control microbial contamination and biofilm formation in cooling towers and process water circuits, improving operational efficiency.
It helps reduce fouling and maintain system cleanliness.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it important in industrial maintenance chemistry.
In paper and cellulose-based materials, it is used to improve resistance to microbial degradation and increase storage stability under humid or warm conditions.
This protects materials from biological breakdown.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it valuable in packaging and paper preservation.
In chemical manufacturing, THPC is used as a reactive intermediate for producing phosphorus-containing derivatives and specialty polymers, enabling further functional material development.
Tetrakis(hydroxymethyl)phosphonium Chlorides hydroxymethyl groups allow controlled chemical modification into other compounds.
This makes it useful in industrial synthesis pathways.
Safety Profile:
Tetrakis(hydroxymethyl)phosphonium Chloride is considered a moderate-hazard industrial chemical with significant safety concerns related to toxicity, irritation, and environmental impact if improperly handled.
Its reactivity and phosphonium structure require controlled use.
Tetrakis(hydroxymethyl)phosphonium Chloride makes strict industrial safety procedures necessary.
Direct contact with Tetrakis(hydroxymethyl)phosphonium Chloride solutions may cause skin and eye irritation, and prolonged exposure may lead to more serious irritation effects depending on concentration.
Protective equipment is required during handling.
Tetrakis(hydroxymethyl)phosphonium Chloride makes occupational safety measures important.
Inhalation of aerosols or vapors may cause respiratory tract irritation, including coughing, throat discomfort, or breathing difficulty in sensitive individuals, especially in poorly ventilated areas.
Proper ventilation reduces exposure risk significantly.
Tetrakis(hydroxymethyl)phosphonium Chloride makes engineering controls essential.
Tetrakis(hydroxymethyl)phosphonium Chloride may decompose under certain conditions to produce irritating or toxic phosphorus-containing compounds, particularly when exposed to heat or strong alkaline environments.
Careful storage and processing conditions are therefore required.
This makes temperature and pH control important.
Environmental release can be harmful because phosphonium compounds may affect aquatic organisms and contribute to ecological imbalance if discharged in large quantities without treatment.
Waste management and containment procedures are required in industrial use.
This makes environmental regulation important.
Tetrakis(hydroxymethyl)phosphonium Chloride is a useful but carefully controlled industrial chemical with toxicity and irritation risks that require proper handling, ventilation, and environmental management.
When used correctly, it is effective in flame-retardant and antimicrobial applications.
Tetrakis(hydroxymethyl)phosphonium Chloride makes it manageable only under regulated industrial conditions.
