Trisodium phosphate, colorless to white acicular crystal or crystalline powder, dodecahydrate, melting point 73.4 ° C. Soluble in water, its aqueous solution is strongly alkaline; Insoluble in ethanol and carbon disulfide. It is one of the important product series of phosphate industry. Because of its special properties, it is widely used in modern chemical industry, agriculture and animal husbandry, petroleum, papermaking, detergent, ceramics and other fields.
It is easy to be deliquescent and weathered in dry air to form sodium dihydrogen phosphate and sodium bicarbonate. It is almost completely decomposed into disodium hydrogen phosphate and sodium hydroxide in water When heated to 55 ~ 65 ° C, it becomes decahydrate, when heated to 60 ~ 100 ° C, it becomes hexahydrate, when heated to more than 100 ° C, it becomes monohydrate, and when heated to more than 212 ° C, it becomes anhydrous. The pH value of 1% aqueous solution is 11.5 ~ 12.1.
In the chemical, textile, printing and dyeing, papermaking, power generation and other industries, it is used as a water softener and detergent, a boiler scale inhibitor, a water softener in paper dyeing, a pH buffer for the production of adhesive for waxed paper, a color fixing agent for printing and dyeing, a mercerization enhancer for fabrics, and an anti embrittlement agent for thread making. Metallurgical industry is used for chemical degreasing and decontamination, and as an excellent accelerator in photographic development solution. Tooth cleaner and bottle detergent. A coagulant for rubber milk. Sugar juice purifier.
Solid trisodium phosphate (TSP) is a strong alkali weak acid salt, with strong alkalinity and high solubility. It has stable chemical properties and can be stored for a long time. Adding TSP to the spray water of the containment spray system (EAS) instead of NaOH can adjust the pH value of the spray liquid, effectively remove the iodine gas released into the containment from the leaked cooling water, avoid the injury of the strong alkali to the staff, and facilitate the cleaning after the accident.
Although trisodium phosphate can be used as aluminum corrosion inhibitor and steel corrosion inhibitor in cleaning agents, it reacts with calcium and magnesium salts in hard water to become insoluble calcium phosphate and magnesium phosphate. However, these phosphates are not sticky and will not stick to the fabric like the calcium and magnesium salts of soap, which is more convenient for cleaning. When used, the dosage should be moderate. Its alkalinity is relatively strong, and it will pollute the water source. Therefore, potassium hydroxide manufacturers suggest that we do not use sodium phosphate as a detergent to wash clothes!
Precautions for use
1. In case of contact with eyes, rinse immediately with plenty of water and consult a doctor.
2. Wear appropriate protective clothing, gloves and goggles or masks.
3. In case of accident or discomfort, seek medical attention immediately (show the label if possible).
First aid measures
Skin contact: take off contaminated clothes, and immediately wash thoroughly with a large amount of flowing water for at least 15 minutes. Seek medical attention.
Eye contact: immediately open the upper and lower eyelids and rinse with flowing water or normal saline for at least 15 minutes. Seek medical attention.
Inhalation: quickly leave the site to a place with fresh air. Keep respiratory tract unobstructed. Give oxygen when breathing is difficult. When breathing stops, give artificial respiration immediately. Seek medical attention.
Ingestion: rinse mouth immediately and drink milk or egg white. Seek medical attention.
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