Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus esters
Reexamination Certificate
2008-07-25
2011-10-18
Caldarola, Glenn (Department: 1771)
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus esters
C558S087000, C558S146000, C210S660000, C210S661000, C210S681000, C210S688000, C438S478000, C438S479000, C438S480000, C438S423000
Reexamination Certificate
active
08039658
ABSTRACT:
A method of removing trace levels of arsenic-containing impurities from raw triethylphosphate (TEPO) is disclosed. The method uses adsorption, or adsorption followed by a flash distillation. The method comprises contacting raw triethylphosphate (TEPO) with an adsorbent which selectively adsorbs the arsenic-containing impurities in the raw triethylphosphate (TEPO). The adsorbent is a base promoted alumina containing adsorbent represented by a formula: ZxWy;where x is the weight percentage of Z in the adsorbent ranging from 30% to 99.999%; y is the weight percentage of W in the adsorbent, and x+y=100%; Z is selected from the group consisting of alumina (Al2O3), magnesium-alumina based layered double hydroxide (MgO—Al2O3), alumina-zeolite, and mixtures thereof; and W is selected from the group consisting of at least one basic metal oxide, at least one basic metal carbonate, and mixtures thereof. The method will result in a final triethylphosphate (TEPO) with a few ppb to less than 1 ppb arsenic containing impurities.
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Bowen Heather Regina
Chandler Kelly Ann
Mayorga Steven Gerard
Air Products and Chemicals Inc.
Caldarola Glenn
Stein Michelle
Yang Lina
LandOfFree
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