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product data sheet: Baysolvex D2EHPA pureissue 52005-05-24
page 1 of 4
TITLE: Baysolvex D2EHPA pure
TEXT: Baysolvex D2EHPA pure is a very efficientand versatile
extraction agent (solvent) inliquid-liquid extraction processes
forpurification, enrichment, separation andrecovery of metal
salts.
Baysolvex D2EHPA pure is also used as aprecursor for wetting
agents and other textileauxiliaries, and as a mould release agent
aswell.
Chemical name di (2-ethylhexyl) phosphoric acid (D2EHPA)
CAS Reg. No. 298-07-7
Structural formula
Empirical formula C16 H35 O4 P
Molecular weight 322.43 g/mol
Physical form clear, almost colorless, medium viscosity,highly
acidic liquid with a slightly sweetishodor.
Health and safety information Safety data and precautions which
must beobserved under all circumstances are to befound in EU Safety
Data Sheet No. 002600.
Hazard characteristics: corrosive.
Specified Properties
Property Nominal Value Unit Test Method
D2EHPA content min. 95 % w/w 2022-2304401-00
M2EHPA* content max. 0.5 % w/w 2022-2304201-00
Acid value 169.5 4.5 mg KOH/g ISO 2114
Water content max. 0.2 % w/w DIN 51 777
Hazen color value max. 50 - ISO 6271
Refractive index n 20/D 1.443 0.001 - DIN 53491
Iron content max. 5 mg/kg 2011-0093701-90
*M2EHPA = mono (2-ethylhexyl) phosphoric acid
PO
OHO
OC8H17
C8H17
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product data sheet: Baysolvex D2EHPA pureissue 52005-05-24
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Additional Information
Property Typical Value Unit Test Method
D2EHPA content 97.0 % w/w 2022-2304401-00D
Water content 0.08 % w/w DIN 51 777
Acid value 171 mg KOH/g DIN 53 402
Hazen color value 10 - ISO 6271
Density at 20C 0.96 g/cm DIN 51 757
Viscosity at 20C 40 mPa s DIN 53 015
Flash point (closed cup) approx. 180 C DIN 51 758
SolubilityD2EHPA in water at 20CWater in D2EHPA at 20C
< 0.1approx. 1.8
% w/w% w/w
These material properties are typical properties and, unless
specifically indicatedotherwise, are not to be considered as
delivery specification.
SolubilityBaysolvex D2EHPA pure is soluble incommon organic
solvents such as aliphatic,aromatic and chlorinated hydrocarbons
aswell as in alcohol. Baysolvex D2EHPA pure is only slightlysoluble
in water (0.1 % by weight at 20C).However, it is very soluble in
caustic sodawith the formation of its sodium di (2-ethylhexyl)
phosphate salt.
The safety precautions normally appliedfor acid-base
neutralizations must beobserved when mixing di
(2-ethylhexyl)phosphoric acid commercial productwith concentrated
sodium hydroxidesolution.
StorageThe product can be stored in tightly sealedoriginal
packaging without quality deterio-ration for a period of at least
two years,where material is stored under the appro-priate
conditions.
Materials for EquipmentThe following materials have proved
suitablefor the metering tanks, pumps and pipes forBaysolvex D2EHPA
pure:glass, stainless steel (e.g. DIN W1.4571 =US AISI 316 TI),
plastics such as poly-ethylene and polytetrafluoro ethylene(PTFE).
Seals should be made of PE, PTFEor graphite.Normal steel (W 1.0254)
is unsuitablebecause of its reaction with di
(2-ethylhexyl)phosphoric acid which results in theformation of
hydrogen.
Packaging200 kg Polyethylene drum900 kg IBC container
PeculiarityThe product is one that is subject tointernational
export control measures. Inaccordance with the international
"Respon-sible Care" initiative, Lanxess AG requiresthat a
declaration of End Use is completedeven where not explicitly
stipulated bylegislation.
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product data sheet: Baysolvex D2EHPA pureissue 52005-05-24
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Application
Baysolvex D2EHPA pure distinguishes oneself by the fact that it
is virtually free of M2EHPA[mono (2-ethylhexyl) phosphoric acid]
and exhibits a very low iron content only.
Liquid-liquid Extraction
The following is an overview of the mostimportant extractions
carried out withD2EHPA in industry :
Lanthanide extraction from HClsolution (bastnaesite concentrate
whichhas been reprocessed using hydro-chloric acid)
Uranium(VI) extraction from H3PO4solution (by-product in the
production ofwet-process phosphoric acid)
Zinc(II) extraction from chloridicsolution (reprocessing of
pyrite cinder;roasting in chlorine)
Zinc(II) extraction from Ca2+/Cl-solution (reprocessing of
pyrite cinder;roasting in chlorine; Kowa-Seiko pro-cess)
Zinc(II) extraction from Na+/H+/SO42solution (ZnSO4 wastewater
from theproduction of viscose fiber)
Zinc(II) extraction from sulfuric acidsolution containing Fe3+
(jarositewashings)
Iron(III) extraction fromHF/HNO3/Cr3+/Ni2+, etc. solutions
(spentstainless-steel pickling agents)
Calcium(II) extraction from MgCl2solution (purification of
concentratedMgCl2 solution)
Calcium(II) extraction fromMg2+/Ni2+/Co2+/SO42- solution
(separa-tion of Ca2+ during the recovery of Ni bythe HIKO
process)
Beryllium(II) extraction from sulfuricacid solution (recovery of
beryllium fromberyl and bertrandite which has beenreprocessed using
sulfuric acid)
Cobalt(II) extraction from Ni2+/Na+/SO42- (cobalt refining)
Gallium(III) extraction from neutralsulfate solution
(concentration of a dilute
gallium sulfate solution in the recoveryof gallium from primary
ore)
Molybdenum(VI) extraction fromsulfuric acid solution
(reprocessing ofMansfeld furnace slags to giveCaMoO4).
Due to the fact that Baysolvex D2EHPApure is virtually free of
M2EHPA [mono (2-ethylhexyl) phosphoric acid] best selec-tivities
can be achieved; e.g. in case of theZn2+ / Fe3+ separation.
Baysolvex D2EHPA pure is always used indiluted form, generally
in concentrations of10-30 %. The diluents employed are
usuallyhigh-boiling aliphatic hydrocarbons (forexample kerosene or
Shellsol D70).
In order to improve the phase separation, itis also possible to
add solubility promoters(modifiers), for example tributyl
phosphate,isodecanol or 2-ethylhexanol, in an amountin the order of
1 10 %.The modifiersincrease the solubility of the D2EHPAsodium
salt or the D2EHPA metalcomplexes in the aliphatic diluents
andconsequently, prevent the formation of athird phase. This is
particularly importantwhere there are high metal loading, pHvalues
are above 3.5, and in the productionof the D2EHPA sodium salt. In
this case theaddition of a modifier may be necessary.The modifier
may affect the position of theextraction equilibrium.
Further detailed information can be found inour brochure
Baysolvex D2EHPA forsolvent extraction.
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product data sheet: Baysolvex D2EHPA pureissue 52005-05-24
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Textile industry
Salts of the di (2-ethylhexyl) phosphoric acidare mainly used as
wetting agents in thetextile industry. Neutral sodium or
potassiumsalt solutions have proven suitable for thepretreatment of
fibers or textiles which are
dyed or antistatic finished in progressivesteps. In comparison
to tensid based wettingagents Baysolvex D2EHPA pure forms
nofoams
Miscellaneous
Due to its one OH-moiety di (2-ethylhexyl)phosphoric acid has an
acidic character.Therefore, it can also be applied as catalystin
acidic catalyzed reactions or as an acidicstopping agent for
alkaline catalyzed
reactions which are carried out in organicmedia.In the field of
the acrylic glass productionBaysolvex D2EHPA pure has proven
suit-able as a mould release agent.
This information and our technical advice - whether verbal, in
writing or by way of trials - are given in good faith butwithout
warranty, and this also applies where proprietary rights of third
parties are involved. Our advice does notrelease you from the
obligation to verify the information currently provided -
especially that contained in our safetydata and technical
information sheets - and to test our products as to their
suitability for the intended processes anduses. The application,
use and processing of our products and the products manufactured by
you on the basis ofour technical advice are beyond our control and,
therefore, entirely your own responsibility. Our products are sold
inaccordance with the current version of our General Conditions of
Sale and
Delivery._________________________________________________________________________________________________________________________LANXESS
Deutschland GmbH, 51369 Leverkusen editor: Dr.
Graupnerwww.lanxess.de
TITLE:Baysolvex D2EHPA pureStructural formulaPhysical formclear,
almost colorless, medium viscosity, highly acidic liquid with a
slightly sweetish odor.
StoragePackagingThis information and our technical advice -
whether verbal, in writing or by way of trials - are given in good
faith but without warranty, and this also applies where proprietary
rights of third parties are involved. Our advice does not release
you from
