Aromatic Diphosphate Synthesis via Lewis Acid Catalysis
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Solution Overview
Problem
Current methods for producing aromatic diphosphates as phosphorus flame-retardant agents result in by-products that deteriorate the physical properties of the resin, requiring costly purification treatments and leading to reduced yield, especially when used in high-temperature molding processes.
Innovation Solution
A two-step method involving the reaction of an aromatic monohydroxy compound with phosphorus oxyhalide and subsequent reaction with an aromatic dihydroxy compound in the presence of a Lewis acid catalyst, under controlled conditions to minimize the production of by-products like phosphorus compounds with hydroxyphenyl groups, thereby maintaining high purity and yield without the need for recrystallization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If recrystallization or crystallization using a solvent is performed to obtain high-purity aromatic diphosphate, then purity is improved, but productivity deteriorates due to additional steps and solvent loss
Solution Approach 1:
The harmful by-product (phosphorus compound with hydroxyphenyl group) is selectively removed through controlled reaction conditions and catalyst selection, eliminating the need for solvent-based recrystallization while maintaining high purity
Solution Approach 2:
Reaction parameters such as temperature, catalyst type, and molar ratios are optimized to suppress by-product formation at the source, achieving high purity through controlled synthesis rather than post-reaction purification
2Ease of manufacture
If phosphorus compound with hydroxyphenyl group is present as by-product, then production cost is reduced by avoiding purification, but durability deteriorates due to adverse effects on resin properties
Solution Approach 1:
The formation of harmful by-products is prevented in advance through optimized reaction conditions and catalyst selection, eliminating the need for post-reaction purification while ensuring high purity and durability
Solution Approach 2:
Reaction parameters including temperature, catalyst type, and molar ratios are precisely controlled to suppress by-product formation, achieving both cost-effectiveness and high durability simultaneously
3Reliability
If aromatic diphosphate is used as flame-retardant agent, then flame-retardant effect is improved, but manufacturing complexity increases due to sensitivity to by-products
Solution Approach 1:
Reaction parameters are optimized to inherently suppress by-product formation, simplifying the manufacturing process while ensuring the aromatic diphosphate meets high purity requirements for effective flame retardancy
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 produces aromatic diphosphates with reduced by-products, ensuring excellent durability and flame retardancy, even at high temperatures, and maintains high purity and yield, making it suitable for industrial-scale production without the need for solvent purification.
Implementation Method 1
an aromatic monohydroxy compound having a steric hindrance group (a group for giving steric hindrance) at ortho-positions... is made to react with phosphorus oxyhalide in the presence of a Lewis acid catalyst
Implementation Method 2
the unreacted phosphorus oxyhalide is removed under a reduced pressure
Implementation Method 3
the reaction product obtained in the above step is made to react with an aromatic dihydroxy compound... in the presence of a Lewis acid catalyst to give an aromatic diphosphate
Data Source
AI summary
A method for producing an aromatic diphosphate comprising: Step 1 which is a step where a specific aromatic monohydroxy compound having a steric hindrance group at ortho-positions is made to react with phosphorus oxyhalide in the presence of a Lewis acid catalyst and then the unreacted phosphorus oxyhalide is removed under a reduced pressure to give a specific; and Step 2 which is a step where the reaction product obtained in the above step is made to react with a specific aromatic dihydroxy compound in an amount of 0.5 mol to 1 mol of halogen contained in the reaction product in the presence of a Lewis acid catalyst to give a specific aromatic diphosphate.