Phosphoric Acid for Sale(75%/85% Food&Tech Grade)

It is odorless, can absorb moisture from air and is easily soluble in water and ethanol. When dissolved, it can give off a lot of heat. Phosphoric acid for sale in the market is non-toxic, corrosive and can corrode quartz. It is a nonvolatile acid without oxidation.Orthophosphoric acid is a phosphoric acid composed of single phosphorus-oxygen tetrahedron. In the phosphoric acid molecule, the P atom is sp3 hybridized, three hybrid orbitals form three sigma bonds with the oxygen atom, and the other P-O bond is composed of a sigma bond from phosphorus to oxygen and two from oxygen to phosphorus consists of d-pπ bonds. The σ-bonding bond is formed by the coordination of a pair of lone pairs of electrons on a phosphorus atom to an empty orbital of an oxygen atom. The d←p bond is formed by overlapping two pairs of lone pairs of electrons in the py and pz orbitals of the oxygen atom and the dxz and dyz orbits of the phosphorus atom. Since the 3d energy level of the phosphorus atom is much higher than the 2p energy level of the oxygen atom, the molecular orbital of the composition is not very effective, so the P-O bond is a triple bond in terms of number. But from the perspective of bond energy and bond length, it is between single and double bonds. There are hydrogen bonds in pure H3PO4 and its crystalline hydrates, which may be the reason why the concentrated phosphoric acid solution is thick.

Physical properties

It is a medium-strong acid with a crystallization point of 21℃. When it is below this temperature, hemihydrate crystals are precipitated. In general, it doesn’t form crystals at temperatures above 10℃ or even lower, because it has a supercooling property. Actually, commercially available phosphoric acid deviates from its crystallization point below 21℃ and won’t crystallize immediately. However, as long as such a low temperature is maintained for a while, it is liable to produce knot crystals in a static state. Phosphate crystallization is physical property rather than chemical property, like other liquid crystallizes. Its chemical property won’t change due to crystallization. Meanwhile, the quality of phosphoric acid won’t affected by crystallization. As long as the temperature is raised to make it melt or adding hot water to make it dilute and melt, it can still be used normally.

Chemical Properties

Phosphoric acid is ternary medium-strong acid, which can be ionized in three steps. It is not easy to volatilize, not easy to decompose. It also has a certain degree of oxidation, as well as the general property of acid. Concentrated phosphoric acid can co-heated with sodium chloride to generate hydrogen chloride gas. It is called high boiling acid made to boiling acid. The principle is to produce volatile acid from volatile acid. Phosphate ions have strong coordination ability, which can form soluble complexes with many metal ions. For example, Fe3 + and PO43- can form colorless soluble complexes [Fe (PO4) 2] 3- and [Fe (HPO4) 2]-. Using this property, PO43- is commonly used to masking Fe3 + ions in analytical chemistry. Concentrated phosphoric acid can dissolve tungsten, zirconium, silicon, iron silicide and form complexes with them. Phosphoric acid will dehydrate when subjected to intense, and can produce pyrophosphoric acid, triphosphoric acid and polyphosphoric acid. Triphosphate is a chain structure, and polymetaphosphate is a cyclic structure. The concentrated hot phosphoric acid can corrode silicon dioxide and produce heteropoly acid. It can also decompose most minerals, such as, chromite, rutile, ilmenite, etc…

1. It needs to be packed in special polyethylene plastic bucket with inner and outer cover sealing the barrel mouth tightly.
2. The package should be clearly marked with the product name, specification, net weight, as well as the symbol of corrosive materials.
3. It should be stored in a cool and ventilated warehouse.
4. In cold winter area, pay attention to the insulation of high concentration phosphoric acid to prevent icing and container rupture leakage.
5. It is nor allowed to be stored and transported together with alkali, toxic substances and other corrosive substances.
6. During transportation, keep out of the rain and hot sun.
7. During loading and unloading, it is necessary to take it lightly and avoid violent impact to prevent package container from breaking.
8. If there is a fire, use dry sand or dry powder fire extinguisher to save.

Risk Analysis

React with melt, it will give off hydrogen, which can form explosive mixture with air. Decomposition by heat will produce highly toxic phosphorus oxide flue gas.
Vapor or mist of phosphoric acid is irritating to eyes, nose and throat. Oral fluids can cause nausea, vomiting, abdominal pain, bloody stools or shock.
It is harmful to the environment and can cause pollution to water.

Keep Safety

• During transportation, ensure that the container won’t leak, collapse, fall or damage.
• The transport vehicle should be equipped with leak emergency treatment equipment.
• Operators must be specially trained and strictly follow the operating procedures. Meanwhile, operators are advised to wear self-suction filter mask, chemical safety glasses, wear rubber acid-resistant clothing and gloves.
• When diluting or preparing solutions, be careful to add the phosphoric acid to the water slowly to prevent overheating and splashing.
• Sealed operation, pay attention to ventilation.
• Be equipped with safe shower and eye wash equipment.