Phosphorus Cyanohydrin Ester Synthesis via Segmented Reaction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing phosphorus-containing cyanohydrin esters, such as those used in the synthesis of glufosinate, face challenges including low yields, high proportions of co-products, difficult purification, and harsh reaction conditions, which affect efficiency and safety.
Innovation Solution
A process involving the reaction of specific compounds with free-radical-forming substances under controlled conditions, using metered streams of reactants and free-radical initiators, to improve yield and purity of phosphorus-containing cyanohydrin esters, thereby facilitating the production of glufosinate or its salts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce phosphorus-containing cyanohydrin esters, then production is possible, but yields are insufficient and co-products are excessively high
Solution Approach 1:
The patent changes the reaction parameters by using a two-stage process with controlled temperature progression (first stage: 0-50°C, second stage: 50-100°C) and specific molar ratios of reactants. This optimization of reaction conditions improves the yield of phosphorus-containing cyanohydrin esters while reducing unwanted co-products compared to conventional single-stage methods.
Solution Approach 2:
The patent divides the reaction process into two distinct stages: a first reaction stage and a second reaction stage, each with specific temperature ranges and reactant addition sequences. This segmentation allows better control over the reaction pathway, improving product yield and reducing side products.
2Manufacturing precision
If conventional methods are used to produce phosphorus-containing cyanohydrin esters, then production is possible, but purification is excessively difficult
Solution Approach 1:
The patent performs preliminary action by optimizing the reaction conditions in the two-stage process to maximize product formation and minimize side products before purification is needed. The controlled temperature progression and specific reactant ratios ensure that the desired product is formed preferentially, reducing the burden on subsequent purification steps.
Solution Approach 2:
By changing the reaction parameters (temperature stages, molar ratios, addition rates), the patent achieves better product selectivity, which directly improves purity and reduces the complexity of purification operations required.
3Reliability
If conventional methods are used to produce phosphorus-containing cyanohydrin esters, then production is possible, but reaction conditions are too harsh
Solution Approach 1:
The patent segments the temperature profile into two stages: a first stage at lower temperatures (0-50°C) for safe initial reaction, and a second stage at higher temperatures (50-100°C) for complete conversion. This segmentation makes the reaction conditions safer and more controllable compared to conventional single-stage high-temperature methods.
Solution Approach 2:
The patent applies preliminary action by conducting the first reaction stage at lower temperatures before proceeding to higher temperatures. This preliminary low-temperature stage allows safe initiation of the reaction and formation of intermediates, reducing safety risks associated with direct high-temperature processing.
Data Source
AI summary
The invention relates primarily to a method for producing certain cyanohydrin esters of formula (I) containing phosphorous, and to their use for producing glufosinate or glufosinate salts. The invention also relates to a method for producing glufosinate or glufosinate salts.