Tetrapotassium Pyrophosphate

Product NameTetrapotassium Pyrophosphate
CAS7320-34-5
MFK4O7P2
MW330.336522
EINECS230-785-7
MOL File7320-34-5.mol

Chemical Properties

Melting point	1300 °C (lit.)
Density	2.33
vapor pressure	0Pa at 20℃
solubility	soluble in H
form	Powder
color	White
PH	pH (40g/l, 25℃) : 10.0～11.0
Odor	Odorless
PH Range	10
Water Solubility	SOLUBLE
Sensitive	Hygroscopic
Merck	14,7663
InChI	InChI=1S/4K.H4O7P2/c;;;;1-8(2,3)7-9(4,5)6/h;;;;(H2,1,2,3)(H2,4,5,6)/q4*+1;/p-4
InChIKey	RYCLIXPGLDDLTM-UHFFFAOYSA-J
SMILES	[K+].[K+].[K+].[K+].P(OP([O-])([O-])=O)([O-])([O-])=O
CAS DataBase Reference	7320-34-5(CAS DataBase Reference)
EPA Substance Registry System	Tetrapotassium pyrophosphate (7320-34-5)

Safety Information

Hazard Codes	Xi
Risk Statements	36/37/38-36
Safety Statements	26-36-22
WGK Germany	2
RTECS	JL6735000
TSCA	Yes
HS Code	28353990
Toxicity	LD50 skin in rabbit: > 4640mg/kg

MSDS

Provider	Language
Potassium pyrophosphate	English

Usage And Synthesis

Chemical Properties

Tetrapotassium pyrophosphate is a white crystalline powder or granules and has a strong moisture absorption capability in air and is easily soluble in water but insoluble in ethanol. Its aqueous solution is alkaline and has effect on inhibition of food spoilage and fermentation.

Tetrapotassium Pyrophosphate.png

Uses

Tetrapotassium pyrophosphate is mostly used in combination with other condensed phosphates. It is commonly used for preventing the generation of struvite in canned fish, preventing the discoloration of canned fruit, increasing the swelling degree of ice cream, the extracting amount of the raw materials of coffee as well as the yield of ham and sausage.

Preparation

Tetrapotassium pyrophosphate is produced by the reaction of furnace-grade phosphoric acid with sodium carbonate to form disodium phosphate, which is then heated to 450 °C to form Tetrapotassium pyrophosphate:

2 Na2HPO4 → Na4P2O7 + H2O

Health Hazard

Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Toxicity evaluation

ADI 0~70mg/k (the total amount of phosphorus calculated from phosphate; FAO/WHO, 2001).

It may cause kidney stones in large doses.

Adl 0~70 mg/kg (in terms of phosphorus); According to the provision of the FAO/WHO (1984): for the processed cheese, the total phosphate is 9 g/kg (in terms of phosphorus); luncheon meat: 3 g/kg; frozen shrimp or prawns: 5 g/kg; cooked meat 3 g/kg (based on anhydrous matter).