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Tetrabutylphosphonium Hydroxide

    • Product Name Tetrabutylphosphonium Hydroxide
    • Alias TBP-OH
    • Einecs 242-240-6
    • Mininmum Order 1 g
    • Factory Site Tengfei Creation Center,55 Jiangjun Avenue, Jiangning District,Nanjing
    • Price Inquiry admin@sinochem-nanjing.com
    • Manufacturer Sinochem Nanjing Corporation
    • CONTACT NOW
    VTB
    Specifications

    HS Code

    166608

    Chemical Name Tetrabutylphosphonium Hydroxide
    Cas Number 871-18-7
    Molecular Formula C16H37OP
    Molecular Weight 276.44 g/mol
    Appearance Colorless to pale yellow liquid
    Odor Characteristic amine-like
    Solubility In Water Miscible
    Density 0.96 g/cm³ at 20°C
    Melting Point -18°C
    Boiling Point Decomposes before boiling
    Ph Strongly basic in aqueous solution
    Storage Temperature Store at 2–8°C
    Hazard Classification Corrosive
    Synonyms TBPH, Tetrabutylphosphanium hydroxide
    Inchi InChI=1S/C16H37P.H2O/c1-5-9-13-17(14-10-6-2,15-11-7-3,16-12-8-4)18/h18H,5-16H2,1-4H3

    As an accredited Tetrabutylphosphonium Hydroxide factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing Tetrabutylphosphonium Hydroxide is supplied in a 500 mL amber glass bottle with a secure, chemical-resistant screw cap and safety label.
    Shipping Tetrabutylphosphonium Hydroxide should be shipped in tightly sealed, chemical-resistant containers to prevent leaks. It must be protected from moisture and incompatible materials. The package should be clearly labeled, and transport should comply with all relevant regulations for corrosive substances. Use secondary containment and appropriate hazard communication during shipping.
    Storage Tetrabutylphosphonium Hydroxide should be stored in a tightly closed, corrosion-resistant container, away from moisture and carbon dioxide. Keep it in a cool, dry, well-ventilated area, away from incompatible materials such as acids and oxidizers. Store at room temperature or as recommended by the manufacturer, and ensure proper labeling and secondary containment to prevent leaks or spills.
    Application of Tetrabutylphosphonium Hydroxide

    Applications of Tetrabutylphosphonium Hydroxide in Industrial Manufacturing

    Tetrabutylphosphonium hydroxide supports advanced material synthesis and specialty process control across several industries. As the original manufacturer, we consistently supply high-purity grades to facilitate downstream fabrication in specific regulated sectors. The following scenarios highlight established industrial uses with strict compliance and proven formulation processes.

    1. Epoxy Resin Curing Systems

    Epoxy compound manufacturers utilize tetrabutylphosphonium hydroxide as a phase-transfer catalyst to optimize the crosslinking of advanced epoxy resins, frequently employed in high-performance coatings, adhesives, and electronic encapsulants. Its unique quaternary phosphonium structure increases the reaction efficiency for bisphenol-A and epichlorohydrin-based resins, while stabilizing rheology during blending and curing. Technical teams control addition precisely during the catalyst introduction phase, ensuring compliance with demanding electrical and mechanical standards.

    Industry compliance standards

    • IPC-4101 (Laminates and prepregs for printed boards)
    • UL 94 (Flammability of plastic materials)
    • REACH Annex XVII (EU chemical restrictions)
    • RoHS Directive 2011/65/EU (Electronic equipment hazardous substance limit)

    Typical usage ratio

    • 0.5−1.8% by weight of total resin system; technical teams adjust within this window based on desired molecular weight distribution and curing speed.

    Downstream process integration

    • Direct incorporation during resin pre-polymerization or co-blending with hardener prior to thermal curing stage in batch or continuous mixers.

    Final product types

    • High-grade electronic circuit board laminates
    • Industrial epoxy floor coatings
    • Adhesive systems for automotive assembly
    • Encapsulating compounds for semiconductors and sensors

    2. Anion-Exchange Membrane Synthesis for Fuel Cells

    Specialty membrane producers employ tetrabutylphosphonium hydroxide for the preparation and functionalization of anion-exchange membranes (AEMs), required in advanced alkaline fuel cell stacks. This compound acts as a quaternizer during polymer backbone modification, facilitating integration of ion-conductive sites. Process engineers add it with strict metering to assure the membrane fulfills both chemical and mechanical benchmarks set by the energy storage sector.

    Industry compliance standards

    • ISO 14687 (Hydrogen fuel—Product specification)
    • SAE J2719 (Hydrogen quality for fuel cell vehicles)
    • IEC TS 62282-1 (Fuel cell technologies—Terminology)
    • Internal specifications for proton conductivity, mechanical robustness, and stability in alkaline media

    Typical usage ratio

    • Between 1.2–2.5% relative to dry polymer substrate mass; dosage tailored to target ion-exchange capacity and degree of functionalization.

    Downstream process integration

    • Added in solution during the membrane casting phase or as a post-polymerization quaternization agent in functional group introduction steps.

    Final product types

    • Anion-exchange membrane rolls for fuel cell stacks
    • Membrane-electrode assemblies for electrolyzers
    • Custom electrolyte membranes for power generation modules

    3. Cellulose Fiber Modification in Specialty Paper & Textile Processing

    Producers in the specialty paper and technical textile industries leverage tetrabutylphosphonium hydroxide for controlled deacetylation and surface functionalization of cellulose fibers. This application enhances the wet strength, dye-uptake and chemical resistance of final substrates, supporting premium segment production. Dosing accuracy is monitored to prevent overtreatment, and equipment is configured for closed-loop recirculation to ensure complete fiber contact at uniform pH levels.

    Industry compliance standards

    • ISO 17088 (Specifications for compostable and biodegradable plastics used in films, sheets, and coated paper)
    • OEKO-TEX Standard 100 (Textile chemical safety)
    • FDA 21 CFR 176.170 (Paper and paperboard in contact with aqueous and fatty foods—when paper used for food packaging)
    • ISO 1833 (Textiles—Quantitative chemical analysis)

    Typical usage ratio

    • 0.8–1.6% w/w, calculated on oven-dried fiber basis; dosage refined to batch viscosity and targeted substitution degree.

    Downstream process integration

    • Injected during aqueous fiber pre-treatment, before forming and pressing; or introduced as a post-bleaching modifier using in-line reactors on continuous web systems.

    Final product types

    • High-grade filter papers and advanced battery separators
    • Printable technical papers for security documents
    • Performance apparel fibers with enhanced moisture management

    4. Catalytic Intermediate in Organic Synthesis for Pharmaceutical Manufacturing

    Pharmaceutical active ingredient manufacturers integrate tetrabutylphosphonium hydroxide into multi-step organic synthesis pathways, taking advantage of its non-nucleophilic base properties and distinctive reactivity profile. Professionals typically introduce the raw material during quaternization, nucleophilic substitution, or selective deprotection stages within GMP-governed environments, with in-process monitoring to secure batch reproducibility and end-product purity consistent with regulatory expectations.

    Industry compliance standards

    • ICH Q7 (Good manufacturing practice for active pharmaceutical ingredients)
    • EU GMP Part II
    • USP–NF (United States Pharmacopeia—National Formulary, applicable monographs)
    • EMA and FDA impurity guidelines

    Typical usage ratio

    • Ranges from 0.4–2.5% by molarity relative to limiting reactant; chemists determine final amount based on step-specific yield and by-product suppression requirements.

    Downstream process integration

    • Delivered into dedicated reactor vessels as part of base-driven reaction stages, typically under nitrogen atmosphere, followed by rapid separation and subsequent purification via crystallization or extraction protocols.

    Final product types

    • Pharmaceutical intermediates for small molecule synthesis
    • Key step derivatives in generic API pathways
    • Custom research compounds for investigational new drug (IND) production

    5. Ion-Conductive Additive in Electrolyte Formulation for Supercapacitors

    Energy storage device assemblers select tetrabutylphosphonium hydroxide for the fine-tuning of ionic conductivity and electrochemical stability of non-aqueous and hybrid electrolyte blends. By strengthening charge transport within electrode–electrolyte interfaces, downstream specialists boost charge–discharge rates and cycle life of high-power supercapacitors. Producers oversee tight parameter control during electrolyte blending and vacuum degassing steps.

    Industry compliance standards

    • IEC 62391 (Fixed electric double-layer capacitors for use in electronic equipment)
    • RoHS Directive (Restriction of Hazardous Substances)
    • REACH (European chemical safety registry)
    • Internal quality system standards for electrolytic materials (ISO 9001-based)

    Typical usage ratio

    • 0.3–1.2% of total electrolyte solvent component mass, with adjustments based on desired ionic mobility and target capacitance.

    Downstream process integration

    • Pre-mixing in closed solvent tanks, followed by blending into bulk electrolyte systems prior to cell assembly and vacuum filling.

    Final product types

    • Electrolyte solutions for double-layer or pseudocapacitor modules
    • Hybrid ultracapacitor cell packs for automotive energy recovery
    • Power management modules in renewable storage systems

    6. Carbon Dioxide Absorption in Gas Sweetening Systems

    Gas processing plants and environmental engineering firms employ tetrabutylphosphonium hydroxide in custom-formulated absorbent liquids to capture and neutralize carbon dioxide from natural gas, biogas, and industrial offgas streams. The quaternary phosphonium cation offers improved thermal stability and reduced volatility compared to amine-based alternatives, allowing downstream process operators to achieve long absorption cycles and energy-efficient regeneration, while meeting global emission targets.

    Industry compliance standards

    • ISO 14001 (Environmental management systems—Requirements for gas treatment operations)
    • US EPA 40 CFR Part 98 (Mandatory greenhouse gas reporting)
    • EN 13606 (Natural gas—Quality specifications)
    • API RP 941 (Steels for hydrogen service at elevated temperatures; relevant to gas plant piping safety)

    Typical usage ratio

    • 1.5–3.0% v/v in absorbent circulation systems; plant engineers optimize levels based on gas throughput and targeted absorption rates at varying pressures.

    Downstream process integration

    • Continuously dosed into absorption towers or packed column reactors in circulating liquid loops, followed by regeneration step via controlled heating or vacuum stripping.

    Final product types

    • Sweetened (CO₂-removed) pipeline natural gas
    • Biomethane with reduced carbon emissions
    • Tail gas streams meeting industrial emission compliance
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    Certification & Compliance
    More Introduction

    Tetrabutylphosphonium Hydroxide: Reliable Performance and Practical Advantages from a Manufacturer’s View

    Authentic Manufacturing: What Drives Our Approach

    Years on the plant floor have taught us that chemicals don’t just move paper—real performance shows up in how each batch behaves when a customer opens the drum. Few chemicals attract frequent calls quite like tetrabutylphosphonium hydroxide, commonly recognized by its shorthand, TBPH. There’s a reason for that: this phosphonium compound fills process gaps that traditional quaternary ammonium or inorganic bases can't patch. Whether our colleagues from electronics, clean energy, or specialty polymer sectors ring us about process tweaks or scale-up runs, their questions usually circle back to reliability, purity, and outcomes downstream.

    TBPH at a Glance: Composition Our Team Can Stand Behind

    Manufacturing TBPH is far more than turning out another pale-yellow solution. Every batch that leaves our site reflects concerted control over water content, residual impurities, and organic byproducts. That matters more than any line in a catalogue. We supply TBPH in aqueous solution, with custom concentrations usually settling between 20% and 40% by weight, although some customers’ reactors require more dilute or concentrated forms. Our purest standard TBPH regularly tests at above 99% cationic purity, confirmed by NMR and titration—analytical details, yes, but those numbers keep specifications real, not just theoretical.

    What Sets TBPH Apart: Perspective from Manufacture to Use

    Operators and R&D chemists that use TBPH rarely confuse it with other phosphonium or ammonium bases. Within our production rooms, the difference is obvious: TBPH releases less vapors compared to competing amines or alkali metal hydroxides, reducing corrosive risks across valves and piping. On the end-user’s site, it’s less about safety data sheets and more about what happens at application—TBPH won’t introduce cesium, sodium, or potassium ions that complicate downstream separations. The tetrabutylphosphonium ion, with its balanced hydrophobic and hydrophilic character, offers a different solubilizing power in organic synthesis or ion-exchange applications.

    Clients from ionomer membrane manufacturing and lithium battery research often reach for TBPH to avoid cross-contamination with other cations. Our colleagues working in phase-transfer catalysis or advanced electronics appreciate how its bulky organic architecture minimizes unwanted side reactions, especially in anion-exchange resins where purity dictates long-term throughput. Compared head-to-head, TBPH solutions generate less heat during neutralizations and solubilize certain organic and inorganic materials with a finesse inorganic hydroxides simply can’t match.

    How TBPH Functions in Modern Manufacturing

    Walking along our filling line, it becomes clear why TBPH continues to grow in demand. Plants working with anion-exchange membranes in water treatment systems tell us that even minor traces of alkali or metal ions can sabotage their performance, leading to thousands in lost operational hours. TBPH’s unique structure fits their needs, freeing resins from sodium and potassium contamination. Polymer modifier producers describe how TBPH assists in subtle deprotonation and quaternization steps, even where more aggressive bases trigger side reactions or polymer degradation.

    In clean energy, especially electrolyzers or fuel cell construction, our manufacturing partners focus on every trace component. Some cathode materials demand a non-metallic base for precise ion-exchange steps. TBPH satisfies this demand, its phosphonium backbone remaining stable under thermal and electrochemical stress. This stability, despite repeated cycling and synthesis, distinguishes our product from traditional quaternary ammonium hydroxides, where degradation can begin even before customer blending. We often adjust water content to support emerging battery technologies, ensuring solubility at every step without sacrificing process safety.

    Why Purity and Consistency Matter: Insights from the Plant

    Few phrases prompt more calls to our technical support than “unexpected residue.” Variability in feedstock, temperature, or storage means small impurities in TBPH, such as tributylphosphine oxide or unreacted tetrabutylphosphonium salts, can show up when least expected. We invest in multi-stage purification and tight process monitoring. That’s our response to real-world failures seen in early test batches. Our site’s analytical team reports directly to production so they can address minor shifts before they become costly rework.

    Customers don’t care for excuses—membrane fouling and catalytic deactivation result from subtle contaminants they can’t always see until a pilot run goes awry. Clean handling in our facility translates into fewer headaches for end-users running large-scale ion-exchange or phase transfer catalysis. These lessons, learned through both routine orders and urgent troubleshooting, reaffirm why we avoid ambiguous or incomplete specifications.

    Application Stories: Feedback from Real-World Users

    Sometimes, value only appears obvious after a process misstep. On a lithium extraction pilot, our client tried cutting costs by switching to a generic ammonium hydroxide. They spent weeks untangling how small amounts of sodium and nitrate affected their separation stages. Returning to our high-purity TBPH, they reported sharper fractionation and lower maintenance on filtration units. In circuit board cleaning lines, operators facing persistent etching failures saw marked improvement after using our TBPH blend, which left zero trace residues in high-aspect through-holes.

    A collaborative research group testing new composite ionomers for hydrogen fuel cells shared results comparing TBPH with other organic bases. Their data, backed by independent mass spectrometry, pinpointed fewer organic residues building up on membrane surfaces—an effect that directly extended stack lifespans. In polyurethane synthesis, specialty additive formulators remarked on the difference TBPH made in controlling pH during critical cross-linking phases, which helped them avoid shrinkage and yellowing that slowed their sales.

    Environmental and Handling Considerations: Long-Term Impact

    Strict compliance with environmental and workplace safety standards guides every batch we make. TBPH carries a lower aquatic toxicity profile compared to certain ammonium derivatives or alkali hydroxides. On our filling line, closed-loop systems cut vapor losses and protect operators from caustic spray. The product’s lower volatility means storage solutions experience slower concentration drift, reducing adjustment requirements over time.

    Labs and factories switching to TBPH notice reductions in hazardous waste volumes, owing to its milder handling properties and solubility profile. Cleaning and changeover on process equipment go quicker, helping users reclaim tankage and avoid metal ion interference in subsequent runs. Some clients commission regular shipment testing—those audits consistently reinforce that our TBPH batches don’t introduce the chloride or sulfate residues that cause headaches months after use.

    Cost Pressures, Supply Stability, and What We’re Doing About It

    Every purchasing manager faces price swings and supply chain uncertainty. Our plant keeps a strategic buffer inventory of raw tetrabutylphosphonium chloride and streamlines internal logistics to minimize delivery lags. Years when upstream phosphine supply contracted, our experience running multi-source validation programs kept disruptions in check. Few suppliers can back up a promise of delivery with firsthand knowledge of chemical conversion, purification, testing, and packaging.

    Our R&D group works alongside production to test advances in energy usage and waste reduction. Updated reactors consume less water and generate fewer side byproducts. Improved distillation lets us recycle offcuts into supporting byproduct streams, cutting both cost and landfill impact. Periodic audits by independent parties confirm our claims and support our certifications. We post batch traceability and purity verifications directly, so our clients can match lot data with their own records.

    Comparisons: TBPH Versus the Usual Suspects

    Some customers ask if cheaper alternatives such as tetraethylammonium hydroxide or sodium hydroxide can substitute for TBPH. We’ve watched those experiments up close. Sodium and potassium bases leave behind unwanted cations, which later appear as trace contamination or unexplained shifts in catalysis or membrane life. Quaternary ammonium hydroxides break down at elevated temperatures, forming problematic side products. TBPH’s larger phosphonium core withstands greater stress before decomposing—this contributes directly to cleaner end products in advanced separations and high-performance coatings.

    In anion-exchange resins and membrane preparation, not all quats behave the same way. Phosphonium ions display a higher organic tolerance, supporting reaction pathways that stifle under ammonium analogues. Chemists pursuing deeper conversion rates in phase-transfer catalysis rely on TBPH’s distinct hydrophobic-hydrophilic interplay, helping steer reactions toward desired intermediates without broadening byproduct spectra. Our routine feedback surveys show reduced operational headaches where customers switch from legacy ammonium or inorganic bases to TBPH in applications demanding high selectivity.

    Supporting Our Clients: From Sample to Scaled Run

    Most process improvements start with a single sample order and a brief call. Our approach is to learn what each customer’s line actually needs, not sell based on guesswork or stock phrases. We share past case studies—anonymized, but concrete—detailing how storage temperatures, tank materials, dilution techniques, and mixing speeds shape TBPH’s real-world handling. This approach speeds up process optimizations and ensures that each use delivers measured benefits.

    Alongside regular lot testing, our support team maintains direct feedback channels for specification tweaks and urgent troubleshooting. Shipping records include full analytical data, so process teams can track the impact of each batch. Routine technical audits help us catch minor shifts before they ripple down the line, protecting both our team and customers from rework or lost time.

    Ongoing Innovation and Real-World Results

    Customer demand pushes us to improve both formulation and supply chain. We’re currently trialing advanced monitoring tools in TBPH reactor vessels, logging real-time concentration, impurity trends, and reaction kinetics. These investments pay off in more reproducible and robust batches, creating certainty that reaches the end-user’s plant floor. Our site team explores alternatives for packaging materials to further minimize contamination or evaporation risks, extending TBPH’s shelf life even in less-than-ideal storage.

    Enhanced quality controls and process upgrades don’t just sound good—they translate into measured improvements for clients: better yields, less downtime, and fewer surprises during scale-up. In the last two years, remote troubleshooting capabilities helped catch dosing errors or equipment sizing mismatches, avoiding expensive loss of batch or run interruptions.

    Direct Engagement: Listening and Learning from Every Batch

    Feedback from actual use teaches us more than any textbook. Technical users across chemical manufacturing, electronics, and clean energy continuously share insights on TBPH’s performance. Their feedback—whether on issues like dilution stability, residue after evaporation, or interaction with exotic feedstocks—feeds directly into our process design and product support. This closes the loop from plant floor back to formulation lab.

    Every TBPH batch carries the weight of the client’s brand and our own. Whether the order is a single can to support a new lab project or a pallet-sized drum for full production, our team stands ready with traceable analytics, knowledgeable support, and genuinely practical advice. For us, success is measured by safety, yield, and trust every time a customer opens a drum.

    Conclusion: Why We Continue to Stand Behind TBPH

    Experience convinces us that tetrabutylphosphonium hydroxide is more than a commodity base. Decision-makers working on the sharp edge of technology need reliable, pure, and straightforward chemical inputs. By controlling our sourcing, maintaining exacting standards, and listening to every field report, we help our customers turn chemical challenges into process successes, batch after batch.