Preparation of a hydroxyalkyl phosphonic acid
AssigneeRohm and Haas Company
InventorsAllen S. Bulick, Sarah L. Hruby, Muhunthan Sathiosatham
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Abstract
The present invention is a process for converting a phosphonate to a hydroxyalkyl phosphonic acid comprising the step of contacting together water, the phosphonate, and a sulfonated or phosphonated heterogeneous catalyst under conditions sufficient to convert at least 50% of the phosphonate to the hydroxyalkyl phosphonic acid. The process of the present invention provides a way of preparing hydroxyalkyl phosphonic acids safely and economically, without corrosive effects.
Claims4
A process for converting a phosphonate to a hydroxyalkyl phosphonic acid comprising the step of contacting together water, the phosphonate, and a heterogeneous catalyst;
- wherein the heterogeneous catalyst is a sulfonated crosslinked macroreticular ion exchange resin;
- wherein the phosphonate is contacted with the sulfonated crosslinked ion-exchange resin at a temperature of from 80° C. to 120° C. for 1 to 24 hours to convert at least 70% of the phosphonate to the hydroxyalkyl phosphonic acid;
- wherein the phosphonate is characterized by the following formula:
- where R is H or acetyl;
- and R1 is C1-C10-alkyl;
- and n is 2 to 10;
- and wherein methyl acetate and methanol are formed in addition to the hydroxyalkyl phosphonic acid.
Dependencies are inferred from the claim text.