Method for making polyphosphoric acid

Method for making polyphosphoric acid

An improved method for making polyphosphoric acid from phosphoric acid includes the steps of introducing a first phosphoric acid feed stream into the top end of a packed column, introducing a second phosphoric acid feed stream into a stream of hot air to form a stream of hot air and acid, introducin...

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Hauptverfasser: HUDSON ROBERT W, MILLS NATHAN P, RAZMUS DAVID MICHAEL, PAYEN VINCENT, MYERS DENNIS L
Format: Patent
Sprache:eng
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CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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creator HUDSON ROBERT W
MILLS NATHAN P
RAZMUS DAVID MICHAEL
PAYEN VINCENT
MYERS DENNIS L
description An improved method for making polyphosphoric acid from phosphoric acid includes the steps of introducing a first phosphoric acid feed stream into the top end of a packed column, introducing a second phosphoric acid feed stream into a stream of hot air to form a stream of hot air and acid, introducing the stream of hot air and acid into the bottom end of the column, and polymerizing phosphoric acid of the first and second phosphoric acid feed streams to make polyphosphoric acid. By-product phosphoric acids containing organic contaminants may be substituted for all or part of the phosphoric acid stream being introduced into the bottom end of the column to allow recovery of the phosphorus values of the by-product phosphoric acids.
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subjects CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
title Method for making polyphosphoric acid
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