Tertiary Alkoxide Base Reduces Viscosity in Triazine Carbamate Synthesis
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Solution Overview
Problem
The existing processes for preparing triazine carbamates often result in excessively high viscosity during reactions, leading to increased energy consumption and the need for specialized equipment or diluted reaction mixtures, which reduces space-time yield and complicates handling and neutralization.
Innovation Solution
The use of a base with a tertiary alkoxide of alkali or earth alkali metals in combination with specific monohydric alcohol solvents, such as tert-butyl or tert-pentyl alcohols, significantly reduces viscosity, allowing for higher reactant concentrations and efficient mixing, thereby improving space-time yield and handling of the reaction mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional bases (alkali metal hydrides, alkoxides, hydroxides) are used in the reaction, then the reaction can proceed, but the viscosity of the reaction mixture becomes excessively high
Solution Approach 1:
The patent changes the chemical composition parameter by introducing a specific base mixture comprising an alkali metal or earth alkali metal alkoxide combined with a quaternary ammonium or phosphonium alkoxide in a weight ratio of 1:4 to 1:10. This parameter change fundamentally alters the reaction mixture's viscosity characteristics, enabling high concentration reactions without excessive viscosity buildup.
Solution Approach 2:
The patent employs a composite base system combining two types of alkoxides with different chemical properties - a metal alkoxide (alkali or earth alkali) and a quaternary ammonium or phosphonium alkoxide. This composite base mixture synergistically reduces viscosity while maintaining reaction effectiveness, allowing higher reactant concentrations and improved space-time yield.
2Ease of operation
If the reaction mixture is diluted to reduce viscosity, then handling becomes easier, but the space-time yield decreases
Solution Approach 1:
The patent changes the concentration parameter by enabling reactions at high reactant concentrations (without dilution) while maintaining acceptable viscosity through the specialized base mixture. This parameter change simultaneously improves productivity (higher space-time yield) and maintains ease of operation (acceptable handling).
Solution Approach 2:
The patent converts the typically harmful effect of high concentration (which would increase viscosity) into a benefit by using the specialized base mixture that prevents viscosity buildup. This allows the process to operate at high concentrations for improved productivity while maintaining ease of handling.
3Ease of operation
If special equipment such as thin film reactors or kneaders is used to handle high viscosity, then the reaction can proceed, but device complexity increases
Solution Approach 1:
The patent changes the viscosity parameter of the reaction mixture through the specialized base mixture, enabling the use of conventional reactor equipment. This parameter change eliminates the need for complex specialized equipment while maintaining ease of operation.
Solution Approach 2:
The patent replaces expensive, complex specialized equipment (thin film reactors, kneaders) with conventional, simpler reactor designs. This substitution reduces device complexity and capital investment while achieving the same handling effectiveness through the improved chemical composition.
4Productivity
If higher reactant concentrations are used to increase productivity, then space-time yield improves, but viscosity increases making handling difficult
Solution Approach 1:
The patent changes the chemical composition parameter by introducing the specialized base mixture, which decouples the relationship between concentration and viscosity. This enables higher reactant concentrations for improved productivity without the usual penalty of excessive viscosity.
Solution Approach 2:
The patent uses a composite base mixture that synergistically manages viscosity at high concentrations. The combination of metal alkoxide and quaternary ammonium/phosphonium alkoxide creates a system that maintains flowability even at high reactant concentrations, enabling improved productivity without handling difficulties.
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 approach allows for higher reaction product concentrations, efficient neutralization, and the use of conventional reactor designs, enhancing the process's efficiency and productivity while maintaining low viscosity, thus overcoming the limitations of previous methods.
Implementation Method 1
a base B which is an alkoxide M(OR1) which is selected from the group consisting of alkali metals (a = 1) and earth alkali metals (a = 2), or mixtures thereof with a further alkoxide M(OR0)
Data Source
AI summary
This invention relates to a process for the preparation of triazine carbamates by reacting a mixture of an aminotriazine A having at least two amino groups per molecule, an organic carbonate C, and a base B selected from the group consisting of alkoxides, and arylalkoxides of metals M, which may be alkali or earth alkali metals, and a solvent S which is a monohydric alcohol solvent R2OH or a mixture of solvents that comprises a monohydric alcohol R2OH, and a monohydric alcohol R3OH, or a mixture of solvents that comprises a monohydric alcohol R2OH with a further solvent selected from the group consisting of ether, alcohol, and hydrocarbon solvents, and adding to the products of the said reaction, an acid or a solution of an acid in a solvent.