Potassium Formate Purification via Phase Separation and Vacuum Evaporation
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Solution Overview
Problem
Existing methods for producing potassium formate lack a comprehensive and effective purification process, resulting in impurities and an inability to achieve high purity levels.
Innovation Solution
A process involving the reaction of formaldehyde, potassium hydroxide, and isobutyraldehyde in water at specific molar ratios and temperatures, followed by neutralization, separation of phases, and final evaporation to produce a melt, which is then filtered to achieve a potassium formate solution with greater than 99% purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification processes are used for potassium formate production, then the production process is simple, but the purity of potassium formate cannot exceed 97.5% and impurities remain
Solution Approach 1:
The patent utilizes phase transition by evaporating water from the reaction mixture to concentrate the solution and induce separation of potassium formate from impurities. The evaporation process transforms the aqueous solution into a concentrated melt, enabling subsequent filtration and crystallization steps that achieve >99% purity.
Solution Approach 2:
The patent extracts impurities from the potassium formate solution through multiple separation steps. First, neutralization with formic acid removes excess potassium hydroxide. Then, evaporation and filtration separate organic impurities from the potassium formate. Finally, recrystallization from water selectively extracts pure potassium formate while leaving impurities behind.
2Use of energy by stationary object
If evaporation is carried out at atmospheric pressure, then the equipment is simple, but the temperature is too high causing decomposition and the process is energy intensive
Solution Approach 1:
The patent changes the pressure parameter from atmospheric pressure to reduced pressure (0.01-0.5 bar) during evaporation. This parameter change allows the evaporation to occur at lower temperatures (60-100°C instead of 100-120°C), preventing decomposition of potassium formate and reducing energy consumption while maintaining process efficiency.
Solution Approach 2:
The patent replaces the conventional high-temperature evaporation system with a vacuum evaporation system. By using pressure reduction instead of high temperature to drive evaporation, the process avoids thermal decomposition and reduces energy input requirements.
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 process effectively separates and purifies potassium formate, achieving a high purity of over 99% weight content, surpassing previous methods by significantly reducing impurities and achieving a pure formate solution.
Implementation Method 1
The reaction solution obtained is neutralised to pH 4-6 and evaporated, whereby two phases are obtained, one aqueous phase, containing the main part of the potassium formate and one organic phase. The organic phase is subsequently separated from the aqueous phase
Implementation Method 2
a final evaporation of the aqueous phase takes place at a pressure of 0.0-1.0 bar, preferably 0.0-0.5 bar or rather 0.0-0.2 bar and a temperature of 160-250° C., to obtain a melt of potassium formate
Data Source
AI summary
The present invention relates to a process for producing potassium formate. Formaldehyde, potassium hydroxide and isobutyraldehyde are reacted in water, at a molar ratio of 1.0:1.0:1.0 to 3.0:2.0:1.0 and at a temperature of 0-1000 C, preferably 30-700 C. The obtained reaction solution is neutralised to pH 4-6 and evaporated in a first step, whereby two phases are obtained, one organic phase and one aqueous phase, the latter comprising the main part of the potassium formate. The organic phase is subsequently separated from the aqueous phase, where after a final evaporation of the aqueous phase takes place at a pressure of 0.0-1.0 bar and a temperature of 160-2500 C, to obtain a melt of potassium formate. Water is added followed by filtration resulting in a solution having a content of >99% by weight of potassium formate, calculated on a water free basis.