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7320-34-5

Basic Information
CAS No.: 7320-34-5
Name: Potassium pyrophosphate
Molecular Structure:
Molecular Structure of 7320-34-5 (Potassium pyrophosphate)
Formula: K4O7P2
Molecular Weight: 330.34
Synonyms: Tetra Potassium Pyrophosphate;Tetrapotassium Pyrophosphate (TKPP);Diphosphoricacid, potassium salt (1:4);Diphosphoricacid, tetrapotassium salt (9CI);Pyrophosphoric acid, tetrapotassium salt(8CI);Phosphosol;Potassium diphosphate (K4P2O7);Potassium phosphate(K4P2O7);Tetrakalium pyrophosphate;Tetrapotassiumdiphosphate;Tetra Potassium Pyrophosphate(TKPP);Potassium Diphosphate;
EINECS: 230-785-7
Density: 2.534
Melting Point: 1109oC
Boiling Point: >1500
Flash Point:
Solubility: Soluble in water
Appearance: White crystalline powder
Hazard Symbols: IrritantXi
Risk Codes: 36/37/38-36
Safety: 26-36
Transport Information:
PSA: 155.23000
LogP: 0.94120
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Chemistry

Empirical Formula: K4O7P2
Molecular Weight: 330.3365 g/mol
EINECS: 230-785-7
Solubility: Soluble in water
Sensitive: Hygroscopic
Appearance: White crystalline powder
Structure of Tetrapotassium pyrophosphate  (CAS NO.7320-34-5):
                    
IUPAC Name: Tetrapotassium phosphonato phosphate
Product Category of Tetrapotassium pyrophosphate  (CAS NO.7320-34-5): Inorganics

Uses

 Tetrapotassium pyrophosphate  (CAS NO.7320-34-5) can be used for non-cyanide electroplating, dyeing, fine clay, etc., and has been used as analytical reagent, hydrogen peroxide stabilizer and soaps' filler.

Production

potassium hydroxide for the production. First, adding 30% phosphoric acid into devices, with stirring, slowly adding potassium hydroxide solution for the reaction, control of pH value 8.4. Heating the solution after reaction, and add activated carbon for bleaching, then having the filtration to remove insolubles, and evaporation, and then cooling and taking them for crystallization to get dipotassium hydrogen phosphate . Heated it to 120 ~ 130 °C off to the crystal water and put it in the 500 ~ 600 °C high temperature for calcination 2 ~ 3h. Tetrapotassium pyrophosphate  (CAS NO.7320-34-5) can be obtained after cooling. Its
H3P04 +2 KOH → K2FIPO4 +2 H2O
2K2HPO4 [△] → K4P2O7 + H2O

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rabbit LD50 skin > 4640mg/kg (4640mg/kg) SKIN AND APPENDAGES (SKIN): "DERMATITIS, OTHER: AFTER SYSTEMIC EXPOSURE" National Technical Information Service. Vol. OTS0571153,
rat LDLo oral 4640mg/kg (4640mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

GASTROINTESTINAL: OTHER CHANGES
National Technical Information Service. Vol. OTS0571153,

Consensus Reports

EPA FIFRA 1988 pesticide subject to registration or re-registration. Reported in EPA TSCA Inventory.

Safety Profile

Hazard Codes: IrritantXi
Risk Statements: 36/37/38-36 
R36:Irritating to eyes. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.

Specification

 Tetrapotassium pyrophosphate , its cas register number is 7320-34-5. It also can be called Potassium pyrophosphate ; and Potassium diphosphate .