1,5-Pentanediamine Extraction Using Basic Substance Precipitation
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Solution Overview
Problem
Current methods for extracting 1,5-pentanediamine from solution systems containing 1,5-pentanediamine salt are complex, costly, and have low recovery rates, particularly when dealing with solid impurities and inorganic salts, which affect the distillation process and product quality.
Innovation Solution
A method involving the addition of a basic substance, such as solid magnesium hydroxide, calcium oxide, or magnesium oxide, to form a solution system with a high molar percentage of sulfate, carbonate, or phosphate of 1,5-pentanediamine, followed by distillation/evaporation, which allows for the formation of poorly soluble inorganic salt precipitates that facilitate continuous conversion and easy removal of impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic solvents such as chloroform or butanol are used for extraction, then extraction efficiency is improved, but environmental pollution increases and solvent recovery cost increases
Solution Approach 1:
The patent changes the fundamental parameter of the extraction system by replacing organic solvents with supercritical carbon dioxide. This parameter change transforms the extraction medium from a liquid organic solvent to a supercritical fluid, which eliminates environmental pollution and solvent recovery costs while maintaining high extraction efficiency. The supercritical state of CO2 provides both the solubility characteristics of liquids and the diffusion properties of gases, enabling effective extraction without harmful byproducts.
Solution Approach 2:
The patent utilizes phase transitions of carbon dioxide between supercritical and gaseous states to achieve extraction and automatic solvent removal. By controlling pressure and temperature, CO2 transitions to a supercritical state for extraction, then returns to gaseous state for easy separation from the extracted compounds. This phase transition mechanism eliminates the need for separate solvent recovery steps and prevents environmental pollution.
2Productivity
If nanofiltration is used to increase recovery rate, then pentanediamine recovery is improved, but membrane blockage increases and process complexity increases
Solution Approach 1:
The patent extracts and removes solid impurities from the solution before the nanofiltration step by adding basic substances that precipitate impurities as insoluble compounds. This preliminary extraction of harmful solid particles prevents them from blocking the nanofiltration membrane, thereby maintaining high recovery rates without increasing process complexity or requiring additional pre-filtration equipment.
Solution Approach 2:
The patent performs preliminary treatment by adding basic substances to precipitate and remove solid impurities before nanofiltration. This preliminary action protects the nanofiltration membrane from blockage, ensuring sustained high recovery rates without increasing device complexity. The precipitated impurities are removed before they can interfere with the membrane filtration process.
3Productivity
If strong bases such as sodium hydroxide or potassium hydroxide are added, then conversion of salt to free base is improved, but salt precipitation increases and distillation yield decreases
Solution Approach 1:
The patent uses calcium oxide or calcium hydroxide as a disposable basic substance that converts the pentanediamine salt to free base while forming insoluble calcium salts that can be easily removed. These calcium-based bases are cheaper than sodium or potassium hydroxide and provide the advantage of forming precipitates that do not interfere with subsequent distillation, thereby maintaining high conversion rates and distillation yields.
Solution Approach 2:
The patent converts the potentially harmful effect of base addition (which could cause salt precipitation and reduce distillation yield) into a beneficial outcome by selecting calcium-based bases that form insoluble precipitates. These precipitates can be easily removed by filtration, and their presence actually aids in the separation process. The conversion of salt to free base is achieved while the formed calcium salts are removed, preventing interference with distillation and maintaining high yield.
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 increases the conversion rate of 1,5-pentanediamine salt to pentanediamine, reduces environmental impact, and lowers operational costs by simplifying the process, improving yield, and allowing for direct distillation without pre-filtration, while minimizing water-soluble inorganic salts in wastewater.
Implementation Method 1
adding a basic substance to a solution system to form a solution system containing free 1,5-pentanediamine
Implementation Method 2
followed by distillation/evaporation
Implementation Method 3
followed by distillation/evaporation
Implementation Method 4
allows for the formation of poorly soluble inorganic salt precipitates that facilitate continuous conversion and easy removal of impurities
Data Source
AI summary
Provided is a method for extracting a 1,5-pentanediamine from a solution system containing a 1,5-pentanediamine salt. The method comprises adding to the solution system an insoluble basic substance to form a solution system containing free 1,5-pentanediamine. The provided method has high applicability, is easy to use, and is environmentally-friendly, significantly lowering raw material costs and operating costs for the entire manufacturing process. The method achieves a high recovery rate for pentanediamine, and is more suitable for industrial-scale production.