Tetrakis(hydroxymethyl)phosphonium sulfate Chemical Properties

Melting point:

-35°C

Boiling point:

111°C

Density 

1.4 g/mL at 25 °C(lit.)

vapor pressure 

0Pa at 20℃

Flash point:

96 °C

storage temp. 

Sealed in dry,Room Temperature

form 

liquid

Specific Gravity

1.42

color 

Colorless to Almost colorless

Water Solubility 

>=10 g/100 mL at 18 ºC

BRN 

8521357

InChI

InChI=1S/C4H12O4P.H2O4S/c5-1-9(2-6,3-7)4-8;1-5(2,3)4/h5-8H,1-4H2;(H2,1,2,3,4)/q+1;/p-1

InChIKey

HFDZMBPIARIWLN-UHFFFAOYSA-M

SMILES

[P+](CO)(CO)(CO)CO.S([O-])(=O)(=O)O

LogP

-9.8

CAS DataBase Reference

55566-30-8(CAS DataBase Reference)

EPA Substance Registry System

Tetrakis(hydroxymethyl)phosphonium sulfate (55566-30-8)

Safety Information

Hazard Codes 

C,N,T

Risk Statements 

22-34-43-50-41-20/22-45

Safety Statements 

26-36/37/39-45-61-53

RIDADR 

UN 2922 8/PG 3

WGK Germany 

1

RTECS 

TA2570000

TSCA 

TSCA listed

HazardClass 

6.1(b)

PackingGroup 

III

HS Code 

29319019

Storage Class

6.1C - Combustible acute toxic Cat.3
toxic compounds or compounds which causing chronic effects

Hazard Classifications

Acute Tox. 3 Inhalation
Acute Tox. 4 Oral
Aquatic Chronic 3
Carc. 1B
Eye Dam. 1
Skin Sens. 1

Hazardous Substances Data

55566-30-8(Hazardous Substances Data)

MSDS

• Language:English Provider:Octakis(hydroxymethyl)diphosphonium sulfate
• Language:English Provider:SigmaAldrich

Tetrakis(hydroxymethyl)phosphonium sulfate Usage And Synthesis

Description

Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) is an organophosphorus compound. It is used as a precursor in the flame retardant manufacturing process, a biocide in water systems, and a tanning agent in the leather industry. THPS is a safe aqueous solution with antimicrobial properties that is significantly less toxic, effective at lower concentrations, and more biodegradable than other traditional biocides.

General Description

Clear colorless viscous liquid.

Air & Water Reactions

Water soluble.

Reactivity Profile

Tetrakis(hydroxymethyl)phosphonium sulfate is incompatible with oxidizing materials and alkalis.

Fire Hazard

Tetrakis(hydroxymethyl)phosphonium sulfate is probably combustible.

Flammability and Explosibility

Non flammable

Synthesis

Add sulfuric acid and formaldehyde into the reaction kettle, open the gas-liquid circulation mixing reaction pump, add phosphine into the gas-liquid circulation mixing reaction pump, at 50-60 ?? through the gas-liquid circulation mixing reaction device to absorb phosphine, phosphine is not completely absorbed into the next gas-liquid circulation mixing reaction pump (the two gas-liquid circulation mixing reaction device is the same, just connected in series, so that it is more conducive to the use of phosphine), the reaction end point is determined by the central control detection of formaldehyde content, and then concentrated by decompression to get tetrahydroxymethylphosphine sulfate. Detect the content of formaldehyde through the central control to determine the end point of the reaction, after the end of the reaction by decompression and concentration to get tetrakis(hydroxymethyl)phosphine sulfate.

Advantages

Advantage of the wet white tanned leathers, using THPS offers:
a light color and pastel shades
They can reach shrink temperatures of at least 70 grad C
High softness
Good lightness
Feeling of naturalness
Pleasant to the touch
Beauty that lasts for a long time
Can be burned without the risk of hexavalent chromium formation

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