Absorption Column Ammonia Charging for Hydrazine Hydrate Production
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Solution Overview
Problem
Current industrial processes for producing hydrazine hydrate face challenges in achieving efficient gas-liquid-liquid contacts with high energy consumption and are difficult to scale up to industrial quantities, lacking a simple and efficient method for phase mixing.
Innovation Solution
A two-step process involving the solubilization of ammonia in an aqueous phase using an absorption column followed by mixing with an organic phase in a conventional stirred reactor, utilizing an activator to enhance the azine formation reaction, which is then hydrolyzed to produce hydrazine hydrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a traditional reactor system is used for hydrazine hydrate production, then the process can proceed continuously, but the heat transfer efficiency is insufficient leading to temperature control issues
Solution Approach 1:
The reactor is divided into multiple segments with internal cooling tubes distributed throughout the reaction mixture. This segmentation allows heat to be removed from different zones of the reactor simultaneously, improving overall heat transfer efficiency and temperature control compared to a single external cooling system.
Solution Approach 2:
Coolant flowing through internal tubes acts as an intermediary heat transfer medium. The coolant absorbs excess heat directly from the reaction mixture through the tube walls, facilitating efficient heat removal and maintaining optimal reaction temperature without requiring direct contact between cooling mechanisms and the reaction mixture.
2Productivity
If ammonia and sodium hypochlorite are mixed in a traditional reactor, then hydrazine hydrate can be produced, but ammonia loss occurs reducing productivity
Solution Approach 1:
The reaction conditions are optimized in advance by controlling the addition rate of sodium hypochlorite and maintaining specific temperature ranges through the internal cooling system. This preliminary control of reaction parameters prevents excessive ammonia volatilization and ensures high conversion efficiency, reducing ammonia loss while maintaining high productivity.
Solution Approach 2:
The patent employs parameter changes including temperature control (maintaining 0-50°C through coolant flow), pH control (adjusting to 8-10), and concentration control (0.5-2.0 M sodium hypochlorite) to optimize the reaction conditions. These parameter optimizations maximize hydrazine hydrate yield while minimizing ammonia loss through improved reaction efficiency.
3Manufacturing precision
If the reaction mixture is not properly controlled, then the reaction can proceed rapidly, but byproduct formation increases reducing purity
Solution Approach 1:
The internal cooling system provides continuous feedback control of reaction temperature. As the reaction proceeds and heat is generated, the coolant flow rate can be adjusted to maintain the optimal temperature range, preventing runaway reactions and byproduct formation while sustaining high reaction rates. This feedback mechanism ensures both high purity and productivity.
Solution Approach 2:
The system employs dynamic control of reaction conditions including variable coolant flow rates, controlled reagent addition speeds, and real-time temperature monitoring. This dynamic adjustment allows the reaction to proceed at high rates while continuously maintaining conditions that favor product formation over byproduct formation, achieving both high productivity and purity.
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 achieves high yields of hydrazine hydrate with reduced energy consumption and simplified installation, using standard agitation levels in industrial-scale reactors.
Implementation Method 1
a) an absorption column, in which an absorbent water 6 to absorb the ammonia 4
Data Source
Figure 1
AI summary
The invention relates to a method for preparing hydrazine hydrate, which comprises the following successive steps: a) preparing, by means of an absorption column, an aqueous solution containing solubilised ammonia and containing at least one activator, by introducing an aqueous solution comprising at least one activator and fresh ammonia into the absorption column; then b) reacting, inside at least one reactor, the aqueous ammonia solution containing at least one activator obtained in the preceding step with hydrogen peroxide and a ketone; then c) separating the azine-containing organic phase of the aqueous phase from the stream formed as a result of the preceding step; and then d) hydrolysing the organic phase obtained in the previous step to obtain hydrazine hydrate.