Purification of phosphorus compounds

Details Purification of phosphorus compounds Purification of phosphorus compounds

1989-10-31

1991-04-16

Silverman, Stanley

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

564 15, 562 14, B01D 1104

Patent

active

050080156

ABSTRACT:
The content of hydrogen chloride and phosphorous acid of crude amino organic phosphonic acids, especially diethylenetriaminepentakis (methylene phosphonic acid) is reduced by solvent extraction into an alcoholic phase leaving purified phosphonic acid behind.

REFERENCES:
patent: 3288846 (1966-11-01), Irani et al.
Kurt Moedritzer et al., "The Direct Synthesis of .alpha.-Amino-methylphosphonic Acids. Mannich-Type Reactions with Orthophosphorous Acid", May 1966, pp. 1603-1607, Research Dept., Inorganic Chemicals Division, Monsanto Company.
Derwent Abstract 15393/E08 (General Chemistry-p. 2, Moscow Lomonosov Univ.-5/15/79, "Purification of Amido or Di:Amido Phosphorous Acids or their Derivitives . . . ".

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