Urea Ammonium Sulphate Pipe Reactor Synthesis
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Solution Overview
Problem
Current commercial production of urea ammonium sulphate (UAS) fertilizers faces challenges such as high urea losses, fluctuating impurities in ammonium sulphate, and increased maintenance costs due to corrosive dust and caking issues in the solid route, while the liquid route struggles to fully utilize heat released during synthesis.
Innovation Solution
A method involving the synthesis of UAS directly in a urea solution using pipe reactor technology, where sulphuric acid and ammonia react to form ammonium sulphate without substantial urea decomposition, allowing for increased urea conversion and flexible AS content, with elemental sulphur added for slow release, and utilizing pipe reactor design to minimize urea loss and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ammonium sulphate is synthesized directly in urea solution using pipe reactor technology, then urea conversion yield is enhanced and maintenance costs are reduced, but the process complexity increases compared to conventional solid route mixing
Solution Approach 1:
The patent combines the urea synthesis and ammonium sulphate synthesis processes into a single integrated system. Ammonium sulphate is synthesized directly within the urea solution in the pipe reactor, merging two separate production steps into one continuous process, thereby enhancing productivity without requiring additional separate reaction vessels or complex downstream mixing operations
Solution Approach 2:
The pipe reactor serves multiple functions simultaneously: it acts as both the urea synthesis reactor and the ammonium sulphate synthesis reactor. This multi-functionality allows the same equipment to perform multiple chemical transformations, reducing the need for additional specialized equipment while maintaining high conversion yields
2Manufacturing precision
If ammonium sulphate is synthesized directly in urea solution, then urea decomposition is minimized and product purity is improved, but precise control of AS content becomes more challenging
Solution Approach 1:
The patent employs feedback control mechanisms to monitor and adjust the synthesis conditions in real-time. By continuously measuring parameters such as temperature, pressure, and reactant concentrations within the pipe reactor, the system can dynamically adjust operating conditions to maintain precise control over ammonium sulphate content while minimizing urea decomposition
Solution Approach 2:
The patent utilizes controlled changes in physical and chemical parameters (temperature, pressure, residence time, reactant ratios) to optimize the synthesis process. By carefully adjusting these parameters within the pipe reactor, the system achieves both high product purity and precise control over ammonium sulphate content in the final urea ammonium sulphate product
3Ease of manufacture
If the liquid route is used for UAS production, then manufacturing simplicity is improved, but heat utilization during synthesis is insufficient
Solution Approach 1:
The patent performs preliminary heating of the urea solution and reactants before they enter the pipe reactor. This pre-heating action prepares the feed streams at optimal temperatures for the exothermic synthesis reactions, ensuring that the heat released during ammonium sulphate formation can be effectively utilized for maintaining reaction temperature and for subsequent product concentration
Solution Approach 2:
The patent utilizes phase transitions, particularly evaporation and condensation, to manage and utilize heat in the process. The heat released during the exothermic ammonium sulphate synthesis is used to evaporate water from the urea solution, and the vapor is then condensed to provide additional heating, creating an efficient heat recovery system that improves overall energy utilization while maintaining manufacturing simplicity
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 method enhances urea conversion yield, reduces maintenance costs, and allows for flexible AS content in UAS, improving the efficiency and stability of the production process while minimizing urea decomposition and corrosion issues.
Implementation Method 1
wherein free ammonia and/or as carbamate to be decomposed from urea production, is reacted with sulphuric acid without substantially decomposing urea in the process stream
Implementation Method 2
The pressure drop through the reactor is between 0 and 10 bars
Implementation Method 3
The heat of reaction for AS production is preferably used for concentration of the UAS solution
Data Source
AI summary
Method for the production of solid urea ammonium sulphate (UAS) fertilizers from sulphuric acid, ammonia and urea, wherein free ammonia and/or as carbamate to be decomposed from urea production, is reacted with sulphuric acid without substantially decomposing urea in the process stream, where after urea and ammonium sulphate (AS) is mixed and particulated. The point of integration of the ammonium sulphate production in the urea production process is chosen according to the desired product composition. The reaction is carried out in a pipe reactor where the head of the reactor enhanced the chemical reaction between sulphuric acid and ammonia and the urea solution surrounds the ammonium sulphate formation.