Trisodium Phosphate

One of the CAS numbers of trisodium phosphate is 7601-54-9. Trisodium phosphate can be regarded as the parent of phosphoric acid H₃PO₄, and three metal sodium atoms Na are used to replace all the elements contained in its molecular formula. The resulting product after 3 hydrogen ions H+.Because phosphoric acid H₃PO₄is a tribasic acid, its molecular formula has three hydrogen ions that can be replaced by metal elements.

Basic Information

Physical properties

1. Colorless to white crystal or crystalline powder, anhydrous or crystal water containing 1-12 molecules, odorless.The melting point of dodecahydrate is 73.4°C.Soluble in water, insoluble in ethanol.The pH value of 1% aqueous solution is 11.5-12.1.

2. Colorless or white crystals.Soluble in water, its aqueous solution is strongly alkaline; insoluble in ethanol and carbon disulfide.

Chemical properties

1. It is easy to deliquescence and weathering in dry air to generate sodium dihydrogen phosphate and sodium bicarbonate.It is almost completely decomposed into disodium hydrogen phosphate and sodium hydroxide in water. Heated to 55-65°C to form decahydrate, heated to 60-100°C to form hexahydrate, heated to above 100°C to form monohydrate, Heated to above 212 ° C to become anhydrous.The pH value of 1% aqueous solution is 11.5-12.1.Oral LD_​​50>2g/kg of woodchuck, AD10～70mg/kg (FAO/WHO, 1994).

Relevant chemical reaction equations:

Na₂CO₃+H₃PO₄→N_a2HPO₄+H₂O+CO₂↑

Na₂HPO₄+NaOH→Na₃PO₄+H₂O

2. Relevant chemical reaction equation:

Ca₅F (PO₄)₃+ 5H₂SO₄+ 10H₂O → 3H₃PO₄+ 5CaSO₄+ 2H₂O + HF

H₃PO₄+Na₂CO₃→Na₂HPO₄+H₂O+CO₂↑

N_a2HPO₄+NaOH→-Na₃PO₄+H₂O

H₃PO₄+3NaOH→Na₃PO₄+3H₂O

H₃PO₄+3NaOH→Na₃PO₄+3H₂O

Application field

1. As a quality improver, it can improve the complex metal ions, pH value, and ionic strength of food, thereby improving the adhesion and water holding capacity of food.China stipulates that it can be used for cheese, and the maximum amount is 5g/kg; the maximum amount used in Western-style ham, meat, fish, shrimp and crab is 3.0g/kg; the maximum amount used in canned food, juice, beverages and dairy products is 0.5g/kg.           

2. Used as water softener and detergent in chemical, textile, printing and dyeing, papermaking, power generation and other industries, boiler scale inhibitor, water softener in paper dyeing, pH buffer for producing varnished paper adhesives, and when printing and dyeing color fixing agent, mercerizing enhancer for fabrics, anti-brittleness agent for thread making.Metallurgical industry for chemical degreasing, decontamination, as an excellent accelerator in photographic developing solutions.Detergent for tooth cleaners and bottle holders.Coagulant for rubber latex.Syrup purifier.Phosphate plays a role in quality improvement in food processing, for example, in meat products, it maintains the water-holding capacity of meat and improves binding force, so as to reduce the loss of nutrients in meat and preserve the tenderness of meat.It is also used as emulsifier, nutritional supplement and quality improver in food processing.It is the raw material for the preparation of lye water for pasta, and is also used in the refining of sugar and the manufacture of α-starch.Also used as a detergent for food bottles, cans, etc.[3]

3. Solid trisodium phosphate (TSP) is a strong base and weak acid salt, with strong alkalinity and high solubility, stable chemical properties, and can be stored for a long time. It can be added to the spray water of the shell spray system (EAS). Instead of NaOH, TSP can adjust the pH value of the spray liquid, effectively remove the iodine gas released from the leaked cooling water into the shell, avoid the injury of the strong alkali to the staff, and is easy to clean up after the accident.

Precautions

Hazard terminology

1. After accidental contact with eyes, rinse immediately with plenty of water and seek medical advice.

2. Wear appropriate protective clothing, gloves and goggles or mask.

3. In the event of an accident or feeling unwell, seek medical attention immediately (show its label if possible).

Risk term

Cause burns.Route of entry: Inhalation and ingestion

Health Hazards: This product severely damages mucous membranes, upper respiratory tract, eyes and ~.Inhalation can be fatal due to spasm, inflammation and edema of the larynx and bronchi, chemical pneumonitis or pulmonary edema.Contact causes burning sensation, coughing, wheezing, laryngitis, shortness of breath, ~, nausea and vomiting.

First-aid

Skin touch: Remove contaminated clothing and rinse immediately with plenty of running water for at least 15 minutes.seek medical attention.

Eye touch: Immediately open the upper and lower eyelids and flush with running water or normal saline for at least 15 minutes.seek medical attention.

Inhalation: Quickly leave the scene to fresh air.Keep the airway open.Give oxygen if breathing is difficult.Once breathing stops, begin CPR immediately.seek medical attention.

Ingestion: If swallowed by mistake, rinse mouth immediately and drink milk or egg white.seek medical attention.

Fire-fighting measures

Extinguishing methods and extinguishing media: Non-combustible.Extinguishing media available around the fire.

Wear a mask and gloves.Mix with sand, dry lime or soda ash, and then bury it deep in a dedicated waste site.If there is a large amount of leakage, it should be discarded after collection and recycling or harmless disposal.

Operation Disposal

Personal protection: higher allowable concentration:

Engineering control: closed operation, pay attention to ventilation.

Respiratory protection: Workers should wear dust masks.Wear a gas mask if necessary.

Eye Protection: Wear protective glasses if necessary.

Body Protection: Wear work clothes.

Hand Protection: Wear protective gloves.

Other protection: After work, shower and change clothes.Practice good hygiene.

Shipping Matters

Store in a cool, ventilated warehouse.Keep away from tinder heat sources.The packaging is required to be sealed and not in contact with the air.Moisture and sun protection.It should be stored separately from acids, etc.When handling, it should be lightly loaded and unloaded to prevent damage to packaging and containers.