N-phosphonomethyliminodiacetic Acid Synthesis via Phosphoric Acid Catalysis
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Solution Overview
Problem
Existing methods for synthesizing N-phosphonomethyliminodiacetic acid face challenges such as the selection of acid catalysts, formation of undesirable by-products, lack of selectivity, and the corrosive nature of chloride ions, leading to inefficiencies and economic concerns.
Innovation Solution
A method involving a reaction mixture with an acid catalyst, a compound having a specific formula, and a P—O—P anhydride moiety to form N-phosphonomethyliminodiacetic acid or its derivatives, using a controlled hydrolysis process to minimize by-product formation and optimize selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods using hydrochloric acid and phosphorous acid are used to synthesize N-phosphonomethyliminodiacetic acid, then the reaction can proceed, but chloride ions cause equipment corrosion and formation of undesirable by-products
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by replacing hydrochloric acid with phosphoric acid as the catalyst. This parameter change eliminates chloride ions from the reaction mixture, thereby preventing equipment corrosion and reducing the formation of undesirable chloride-containing by-products while maintaining the synthesis efficiency of N-phosphonomethyliminodiacetic acid
Solution Approach 2:
The patent converts the potentially harmful effect of strong acid catalysts (which cause corrosion and by-product formation) into a beneficial process by using phosphoric acid that provides catalytic activity without the harmful chloride ions. The phosphoric acid catalyst system transforms the reaction to produce the desired product with improved environmental and equipment compatibility
2Productivity
If strong mineral acids are used as catalysts in the synthesis process, then reaction efficiency can be improved, but equipment corrosion increases
Solution Approach 1:
The patent changes the acid catalyst parameter from strong mineral acids (hydrochloric, sulfuric) to phosphoric acid. This parameter change maintains the catalytic efficiency needed for good reaction productivity while eliminating the severe corrosion problems associated with chloride and sulfate ions, achieving both high productivity and equipment protection
3Manufacturing precision
If conventional synthesis methods are used, then N-phosphonomethyliminodiacetic acid can be produced, but selectivity is poor and by-products are formed
Solution Approach 1:
The patent changes the catalytic system parameter to phosphoric acid, which provides superior selectivity for the formation of N-phosphonomethyliminodiacetic acid. This parameter change reduces side reactions and by-product formation, improving manufacturing precision and reducing material loss through better reaction specificity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides an efficient, economical, and environmentally friendly synthesis of N-phosphonomethyliminodiacetic acid, reducing the need for special precautions and minimizing equipment corrosion, while improving product quality and reducing operational costs.
Implementation Method 1
forming a reaction mixture comprising an acid catalyst, a compound having the general formula R1—CH2—NX—CH2—R2 and a compound having one or more P—O—P anhydride moieties, to form a compound having the general formula R1—CH2—N(—CH2—PO3H2)(—CH2—R2)
Implementation Method 2
b) hydrolyzing the reaction mixture to form N-phosphonomethyliminodiacetic acid or one of its derivatives
Data Source
AI summary
A method for synthesis of N-phosphonoalkyliminodiacetic acid or derivatives thereof by forming a reaction mixture having an acid catalyst, a compound of the following general formula R1—CH2—NX—CH2—R2 and a compound having one or more P—O—P anhydride moieties to form a compound having a formula R1—CH2—N(—CH2PO3R32)(—CH2—R2) wherein in R1—CH2—NX—CH2—R2: X is —CH2—OH or —CH2—COOH; R1 and R2 are independently selected from the group consisting of nitrile, C1-C4 alkyl carboxylate, and carboxylic acid for when X is —CH2—OH, or R1 and R2 are both carbonyl groups linked by a hydrogen substituted nitrogen atom or a C1-C4-alkyl substituted nitrogen atom; and R3 is H, an alkyl group, or an aryl group; the anhydride moieties in the P—O—P anhydride compound have one P atom at the oxidation state (+III) and one P atom at the oxidation state (+III) or (+V); and 2) hydrolyzing the mixture to form N-phosphonomethyliminodiacetic acid or one of its derivatives.