NPK Fertiliser Process Thermal Balance via Reaction Coupling
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Solution Overview
Problem
Conventional NPK fertiliser production processes require energy-intensive temperature control measures, leading to increased production costs and environmental impact, and often involve complex equipment and long production times.
Innovation Solution
A process that couples and coordinates endothermic and exothermic reactions between potassium carbonate, ammonium hydrogen carbonate, and phosphoric acid to produce NPK fertiliser without the need for external cooling or heating devices, maintaining the reaction temperature within a desired range through precise control of reactant addition rates and amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If temperature control measures (cooling or heating) are implemented in conventional NPK fertiliser production processes, then the reaction temperature can be maintained within suitable ranges, but production costs increase and environmental impact worsens due to high energy consumption
Solution Approach 1:
The patent utilizes the exothermic heat generated during the neutralization reaction between phosphoric acid and carbonates/bicarbonates to drive the endothermic decomposition of ammonium bicarbonate. This converts the harmful waste heat that would otherwise require cooling into a useful energy source for maintaining reaction temperature, eliminating the need for external heating and reducing energy consumption.
Solution Approach 2:
The patent combines multiple reactions (neutralization, decomposition, and fertilizer formation) into a single integrated reaction system. By merging the exothermic neutralization reaction with the endothermic decomposition reaction in one reactor, the system achieves self-regulating temperature control without requiring separate heating or cooling equipment.
2Temperature
If conventional processes use separate production and mixing steps for NPK components, then temperature control is easier, but production time increases and productivity decreases
Solution Approach 1:
The patent merges the production of multiple fertilizer components (ammonium phosphate and potassium phosphate) into a single simultaneous reaction process. All reactants (phosphoric acid, carbonate, and bicarbonate) are introduced together into one reactor, allowing concurrent formation of multiple products without sequential steps or separate mixing operations, thereby reducing production time and increasing productivity.
3Reliability
If complex equipment and multiple production steps are used in prior art processes, then product quality can be maintained, but device complexity and production time increase
Solution Approach 1:
The patent consolidates multiple production steps and equipment requirements into a single reactor system where all reactions occur simultaneously. This simplification maintains product quality because the integrated process ensures proper stoichiometric ratios and reaction conditions are achieved through careful control of reactant addition, eliminating the need for complex multi-step equipment while producing high-quality NPK fertiliser.
4Temperature
If external cooling or heating devices are used for temperature control, then reaction temperature can be maintained, but production costs increase and equipment complexity increases
Solution Approach 1:
The patent creates a self-regulating reaction system where the exothermic neutralization reaction automatically provides the heat needed for the endothermic decomposition reaction. This internal heat exchange mechanism eliminates the need for external heating or cooling devices, simplifying equipment while maintaining precise temperature control through the inherent thermal balance of the coupled reactions.
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 the production of NPK fertiliser with all required components in a single reaction mixture, reducing energy consumption and production costs, while simplifying equipment requirements and shortening production time, and minimizing environmental impact by eliminating the need for external temperature control devices.
Implementation Method 1
the at least one exothermic reaction comprises the reaction of K2CO3 with H2O to form KHCO3 and KOH
Implementation Method 2
the reaction of KHCO3 with H3PO4 to form K3PO4, CO2 and H2O
Implementation Method 3
the at least one endothermic reaction comprises or constitutes the reaction of NH4HCO3 with H3PO4 to form (NH4)3PO4, CO2 and H2O
Data Source
AI summary
The present invention relates to a process for producing a liquid NPK fertiliser, which is characterised in that the educts K2CO3 or KHCO3, NH4HCO3 and H3PO4 are reacted in aqueous solution to form potassium and ammonium phosphates, in particular to form K3PO4 and (NH4)3PO4, wherein the reaction takes place in a plurality of steps and comprises at least one exothermic reaction and at least one endothermic reaction, and wherein the temperature of the reaction is controlled by regulating the added amount and rate of addition of the respective educts in the various steps such that the reaction mixture is kept in a desired temperature range, throughout the entire reaction without any external cooling or heating devices being required to control the temperature of the reaction.