Method for preparing formylphosphonic acid
AssigneeMonsanto Company
InventorThaddeus S. Franczyk II
Life of this patent
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Abstract
An improved process for the manufacture of formylphosphonic acid derivatives is reported. An aminomethylphosphonic acid substrate is contacted with a reagent selected from the group consisting of water, an alcohol, a phenol compound, and mixtures thereof and an oxidizing gas in the presence of a catalyst to form a reaction product mixture containing a formylphosphonic acid derivative and the conditions under which said contacting is carried out are controlled so that no more than 50% of the formylphosphonic acid derivative formed in the reaction product mixture is consumed by reaction with the reagent.
Claims40
A method for the preparation of a formylphosphonic acid derivative, the method comprising:
- contacting an aminomethylphosphonic acid substrate, a reagent selected from the group consisting of water, an alcohol, a phenol compound, and mixtures thereof and an oxidizing gas in the presence of a catalyst to form a reaction produce mixture containing a formylphosphonic acid derivative, and
- controlling the conditions under which said contacting is carried out so that no more than 50% of the formylphosphonic acid derivative formed in the reaction product mixture is consumed by reaction with the reagent.
The method of 1 wherein said contacting is carried out in a batch reaction zone wherein formation of the formylphosphonic acid derivative is terminated at an end point at which at least 75% of said substrate charged to the reaction zone has been converted to the formylphosphonic acid derivative.
A method for the preparation of a formylphosphonic acid derivative, the method comprising contacting an aminomethylphosphonic acid substrate, a reagent selected from the group consisting of water, an alcohol, a phenol compound, and mixtures thereof, and an oxidizing gas in the presence of a homogeneous catalyst to form a reaction product mixture containing a formylphosphonic acid derivative.
Dependencies are inferred from the claim text.