Tri-n-Butyl Phosphate TOPS-03™ (TBP)

Tri Butyl Phosphate (TBP) is an Organo phosphorus compound which is pale yellow in color and used as an extractant and plasticizer. It is an ester of phosphonic acid with n- butanol.

In the nuclear industry it is used as nuclear solvent for extraction and purification of various radioisotopes / rare – earth metals from ores as well as spent fuels by solvent extraction due to its formation of stable hydrophobic complexes with some metals.

It also exhibits huge demand in the non-nuclear fields such as solvent & plasticizer for cellulose esters, as a component of aircraft hydraulic fluid / brake fluid, as a solvent in inks, emulsions, synthetic resins, gums, adhesives, defoamer and as herbicide & fungicide concentrates & heat-exchange medium.

Item	Unit	Value	Method/Standards
Sampling	---	---	ASTM-D300/D270
Assay	%	> 99.7	Gas chromatograph
Appearance	---	Clear, colorless	Visual
Density at	g/cc	0.973	ASTM-D1298 – 80
Viscosity	cp	3.32	ASTM-D445 – 79
Refractive Index	--	1.4226	ASTM-D1218 – 61
Surface Tension	mN/m	>27 (+ - 0.5)	ASTM D 971-99a
IFT tension with water	mN/m	>8	ASTM D 971-99a
Solubility in water	g/l	0.39	Total phosphorus by ICP
Solubility of water	g/l	64	ASTM D 1533 -00
Butanol content	Red. Nor, N	< 0.05	Gas chromatograph
HDBP	ppm	< 42	Gas chromatograph
H2MBP	ppm	< 31	Gas chromatograph
Moisture Content	mg/ml	< 2	ASTM-D1533/D1744
Free Phosphoric Acid	%	< 0.02	Spectrophotometer