Tetrabutylammonium hydrogen phosphate appears under the molecular formula C16H38NO4P and holds a distinct position among quaternary ammonium salts. Its structure centers around a bulky tetrabutylammonium cation paired with a hydrogen phosphate anion, providing a combination of organic and inorganic chemical traits. In business or academic catalogs, the compound often goes by its full name along with its HS Code 2923900090, helping buyers and customs officials trace and regulate the material across borders. The substance takes shape as a solid at room temperature, typically found as white flakes, powder, or sometimes crystalline particles, depending on storage and manufacturing conditions.
Most who have handled Tetrabutylammonium hydrogen phosphate notice its pure white appearance, an immediate indicator of product quality. The solid form, easy to crush or grind, dissolves readily in polar solvents such as water and methanol, releasing the characteristic butyl odor associated with quaternary ammonium salts. Density measures around 1.05 g/cm3, but variations arise based on packaging and purity. The compound stays stable in normal indoor storage—away from heat, moisture, and open flames—making it a reliable pick for analytical or synthetic tasks.
Its chemical backbone contains four butyl groups bonded to a central nitrogen atom, surrounded by a single hydrogen phosphate unit. This structural mix gives rise to robust chemical properties: on one side, the hydrophobic butyl chains help compatibility with organic phases; on the other, the inorganic phosphate ensures strong ion-pairing in water-based solutions. Unlike some quaternary salts, it avoids clumping or excess absorption of water from the air when stored in tightly sealed containers, allowing it to retain its solid or powder form for months.
Supplies range from crystalline solids and coarse flakes to fine powders, and—less often—small pearls for specialized applications. Liquid forms appear only in concentrated solutions, often prepared fresh in laboratories right before use, since the chemical prefers its more stable solid state in storage and transport. No matter the physical form, the substance dissolves quickly and responds well to filtration and handling, minimizing waste during formulation or research.
In the world of biochemistry, analytical chemistry, and industrial synthesis, Tetrabutylammonium hydrogen phosphate earns its role as a phase transfer catalyst, buffer, or ionic reagent, thanks to its reactivity and solubility range. In my work with buffer systems or extractions, this compound simplifies separations without triggering unwanted side reactions, showing reliable behavior both at small and large scales. On the other hand, the chemical’s safety demands respect. Inhaling dust or extended skin contact can trigger mild irritation, though the compound does not rate as acutely toxic by most regulatory standards. Always follow standard glove and goggle protocol and, crucially, ensure good local ventilation during weighing or dissolution.
Beneath every batch lies the formula C16H38NO4P and a specific molecular weight near 339.45 g/mol, confirmed by laboratory assay and purity checks. Professional suppliers indicate exact density, melting point—often cited around 125°C—and solubility figures for each lot, ensuring users can match these qualities to their own process needs. Reliable performance comes from meticulous control over raw materials: both the tetrabutylammonium base and hydrogen phosphate precursor must meet high standards before any final product packages ship to users, which experience has proven is essential for process repeatability and safety.
Everything starts with accurately sourced tetra-n-butylammonium hydroxide and a pure solution of phosphoric acid, reacted under measured temperatures to yield the hydrogen phosphate salt. Through careful filtration, drying, and grinding, workers deliver a uniform product ready for research or industrial application. From time to time, contaminants or byproducts from incomplete reactions can introduce hazards or lower grade, so ongoing quality checks—mass spectrometry, pH analysis, and moisture testing—remain the norm across reputable supply chains.
During pouring and weighing, density measurements prove useful: packing powder or crystals too tightly in a bottle can delay dissolution or cause lumps, showing why accurate dosing and gentle agitation matter with this and similar salts. From lab to warehouse, containers must stay dry and tightly closed, shielding contents from atmospheric moisture that could degrade quality. Even experienced users get tripped up by improper storage, which leads to slow caking or, in the worst cases, mild chemical decomposition that creates mysterious performance issues down the line.
While Tetrabutylammonium hydrogen phosphate does not show aggressive reactivity in standard lab settings, direct contact with acids or oxidizing agents brings the risk of hazardous decomposition. Disposal relies on local regulations for nonhazardous laboratory waste, but clarity in record-keeping—labeling, documentation, and batch tracking—remains a must. Proper training for all staff handling raw materials or stock solutions builds a culture of safety and responsibility, reducing costly mistakes and unnecessary exposure.
From high-purity syntheses to reliable separation protocols, this chemical provides performance that backs up its widespread use. With attention to purity, storage, and handling, users can benefit from its full range of properties while protecting workers and the environment. The mix of organic character and phosphate-based reactivity gives it a place among modern laboratory staples, provided its power and hazards stay under careful watch. With rising demand in specialty applications, those serious about quality and safety stand to make the most of what Tetrabutylammonium hydrogen phosphate can offer.
