Solid-Phase Phosphonate Salt Production for Fungicidal Use
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Solution Overview
Problem
Existing methods for producing phosphonate salts in aqueous media are inefficient and costly due to the need for water removal, and there is a need for fungicidal agents that provide broad-spectrum, fast-acting, and long-lasting protection against harmful fungi.
Innovation Solution
A method involving the reaction of solid phosphonic acid with solid basic salts, such as dolomite, and sulfur in the absence of liquid media, producing phosphonate salts in solid form, which can be combined with sulfur and urea to enhance fungicidal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If phosphonate salts are produced in aqueous medium by conventional methods, then the reaction proceeds efficiently with good solubility, but water removal is required which increases production costs and reduces efficiency
Solution Approach 1:
The invention changes the physical state parameter of the reactants from aqueous solution to solid form. By using solid phosphonic acid and solid basic salt, the reaction proceeds without requiring water removal steps, directly producing solid phosphonate salt product and eliminating the costly water removal process inherent in conventional aqueous methods
Solution Approach 2:
The invention utilizes phase transition by conducting the neutralization reaction in the solid state rather than in aqueous solution. The solid-phase reaction between phosphonic acid and basic salt directly yields solid phosphonate salt, avoiding the liquid-to-vapor phase transition (evaporation) that would be required to remove water from aqueous reaction mixtures
2Loss of substance
If phosphonic acid and basic salt are mixed in solid form without liquid media, then water removal costs are eliminated, but the reaction efficiency and product solubility may be reduced
Solution Approach 1:
The invention optimizes particle size parameters of the solid reactants to enhance surface area and contact between phosphonic acid and basic salt particles. This particle size reduction compensates for the absence of liquid media by increasing the effective reaction interface, thereby maintaining high reaction efficiency in the solid-state process
3Adaptability or versatility
If conventional fungicidal agents are used, then broad-spectrum protection is achieved, but fast-acting and long-lasting properties are not simultaneously provided
Solution Approach 1:
The invention merges phosphonate salt with sulfur and optionally urea into a single composite fungicidal composition. This combination integrates the broad-spectrum protection capability of phosphonate salts with the complementary properties of sulfur, achieving both fast-acting and long-lasting fungicidal effects simultaneously in one application
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
The method yields phosphonate salts in a cost-effective and efficient manner, providing effective, broad-spectrum fungicidal protection with both fast-acting and long-lasting properties, suitable for agricultural applications.
Implementation Method 1
mixing phosphonic acid in solid form with a basic salt in solid form... phosphonic acid is reacted with a basic salt of the desired cation, such as a carbonate or a hydroxide
Implementation Method 2
producing phosphonate salts in solid form... The preparation of phosphonate salts is generally carried out in aqueous medium
Data Source
AI summary
The present invention relates to a method for producing a composition containing a phosphonate salt by mixing the reaction partners in solid form. The invention also relates to solid compositions A obtainable by said method and to the use of these compositions for combating harmful fungi.The invention moreover relates to compositions B comprising (a) a phosphonate salt of an alkali or earth alkaline metal or of two or more alkali and/or earth alkaline metals, and (b) sulfur and/or urea. In one embodiment, this composition B is solid. In another embodiment, this composition B comprises calcium phosphonate, magnesium phosphonate and sulfur.The invention also relates the use of these compositions A or B for combating harmful fungi.