Sodium Hypophosphite

Sodium hypophosphite monohydrate in electroplating, chemical plating, water-reducing agent and other industries are also customarily called sodium hypophosphite, the two in the molecular structure, appearance, indicators are the same, completely the same chemical. Sodium hypophosphite molecular formula for NaH2PO2.H2O, is a positive salt, there is no acid salt, with reducing effect, no toxicity, in the non-halogenated flame retardants, water-reducing agents, chemical plating of nickel, pharmaceutical intermediates, food antioxidants, water treatment and other industries with a wide range of uses. Sodium hypophosphite PH value of 6-8, neutral, there is no acid-base, the chemical formula of the phosphorus valence of +1 price, the phosphorus content of 29.8%, the decomposition temperature of 200 ℃, the decomposition products for PH3, Na3PO4, etc..

Basic data

English name: Sodium Hypophosphite; SHPP

H.S code: 28351000.00

CAS No.: 10039-56-2(Sodium Hypophosphite Monohydrate); 7681-53-0(Sodium Hypophosphite Anhydrous)

EINECS No.: 231-669-9

Molecular Formula: NaH2PO2.H2O

Molecular weight: 105.99

Melting point: 125.1～127.4°C

Density(20℃):1.77 g/cm3

Flash point: non-flammable

Solubility(20℃): 100g/100ml water

Appearance: white crystals similar to quicksand

Execution Standard: HG/T3253-2000

Export tax rebate rate：0%

Hazardous grade: export according to general cargo transportation storage

Waste nature: not hazardous waste

Quantity of 20-foot container: 20 tons of pallets; 25 tons of pallets without pallets; fumigation-free pallets or CP1-3 pallets

Product index

Purity≥101

Sodium phosphite(Na2HPO3)≤0.5%.

Sulfate(SO4)≤100mg/kg

Chlorine(Cl)≤100mg/kg

PH value: 6.0-8.0

Calcium(Ca)≤50mg/kg

Iron(Fe)≤5mg/kg

Lead(Pb)≤5mg/kg

Arsenic (As) ≤5mg/kg

Cadmium(Cd)≤5mg/kg

Chromium (Cr) ≤5mg/kg

Sodium hypophosphite reduction mechanism

1, and the role of the oxidizer

The phosphorus of sodium hypophosphite has a valence of +1, which can be oxidized into +3, +5 valence phosphate by electron transfer under the conditions of oxidant, oxygen, metal oxides and halogens. The reaction formula is as follows: 2NaH2PO2 + O2 → Na2HPO3 → Na3PO4

2, and the redox effect of metal ions

High-valent copper, silver, nickel, etc. have oxidizing properties, can be redox reaction with sodium hypophosphite, the reaction formula is as follows:

NaH2PO2+4Ag++2H2O→HgPO4+4Ag+4H+.

NaH2PO2+2Cu²++2H2O→HgPO4+2Cu+4H+.

Therefore, sodium hypophosphite should be avoided to be stored or mixed with oxidizing agents, copper sulfate, nickel sulfate, silver nitrate, silver chloride and so on during the storage process.

The main use

1, is the main raw material for the production of halogen-free flame retardant aluminum hypophosphite, and aluminum sulfate under the conditions of auxiliary reaction: NaH2PO2 + Al2 (SO4)3→Al(H2PO2)3 + Na2SO4, it is necessary to point out that the reaction process, the choice of auxiliaries, etc., may lead to the generation of aluminum hydroxide precipitation, which affects the quality of aluminum hypophosphite flame retardant.

2, is an organic hypophosphite, such as the main raw material of aluminum diethylphosphite flame retardant, and ethylene synthesized at high temperatures, this reaction is more complex, the synthesis is difficult, the reaction process control on the rate of acceptance, the molecular crystal type, flame retardant temperature resistance, stability have a greater impact.

3, sodium hypophosphite in nickel plating can be nickel sulfate, copper sulfate, etc. Reduced to nickel metal, to play a corrosion-resistant, abrasion-resistant, enhance the role of product surface hardness. Reaction equation is as follows: NiSO4 + 2NaH2PO2 + 2H2O → Ni + 2H3PO3 + Na2SO4, chemical nickel plating solution is often added lactic acid, citric acid, malic acid and other additives.

4, can be used for the synthetic production of calcium hypophosphite, potassium hypophosphite, nickel hypophosphite, zinc hypophosphite and other salts.

5, in water treatment and plastic additives can be used to produce organic phosphine compounds.

6, It is an important raw material for the production of high-end, environmentally friendly polycarboxylic acid water reducing agent, its safety, environmental protection, operability than mercaptopropionic acid, mercaptoacetic acid, hanging white block has more advantages.

Storage and transportation

Stored in cool and dry warehouse, pay attention to moisture, prevent exposure to sunlight, open the bag is not used up to be

Packing

25kg&500kg&1000&/bag, kraft paper bag, built-in polyethylene bag.

The price trend of sodium hypophosphite is closely related to the price of yellow phosphorus, the exchange rate, the price of tetrahydroxymethylphosphonium sulfate, the domestic production capacity, foreign demand, the production of non-halogenated flame retardants, environmental protection policies and many other factors. The main production raw materials are yellow phosphorus, quicklime, liquid alkali and water.