Continuous Urea Urethane Manufacturing Process
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Solution Overview
Problem
Urea urethanes are currently produced through batch processes, which face challenges such as exothermic reactions making temperature control difficult, the need for significant excess isocyanate leading to separation steps, and lengthy reaction times, resulting in undefined structures and inefficiencies.
Innovation Solution
A continuous process for manufacturing urea urethanes using monohydroxyl, diisocyanate, and diamine compounds in a two-stage continuous reactor system, with optional isocyanate stabilizers and anti-gelling agents, allowing for improved temperature control and reduced production time without the need for distillation or isolation of intermediates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If batch process is used for urea urethane manufacture, then reaction can be conducted with simple equipment, but temperature control is difficult and reaction time is lengthy
Solution Approach 1:
The patent implements a continuous flow process where reactants are continuously fed through a flow reactor, maintaining steady-state conditions that enable superior temperature control compared to batch processing. The continuous operation allows for consistent heat removal and prevents temperature runaway, while the flow reactor design maintains simple equipment architecture.
2Reliability
If batch process with excess isocyanate is used, then complete reaction is achieved, but separation step is mandatory and production time increases
Solution Approach 1:
The patent changes the reaction parameters by using a flow reactor with controlled residence time and optimized reactant ratios close to stoichiometric balance. This allows complete reaction to be achieved without excessive isocyanate, eliminating the need for separation steps while maintaining production efficiency. The continuous flow system enables precise control over reaction progress.
3Device complexity
If batch process is used, then process simplicity is maintained, but reaction time is many hours and structure is undefined
Solution Approach 1:
The continuous flow process maintains steady-state reaction conditions that produce urea urethanes with well-defined molecular structures. The consistent temperature, pressure, and residence time parameters ensure uniform product composition, while the flow reactor design keeps the process relatively simple compared to complex batch operations.
4Temperature
If continuous process is implemented, then temperature control is improved and reaction time reduced, but equipment complexity increases
Solution Approach 1:
The flow reactor enables continuous operation with superior temperature control through steady-state heat management. While the equipment is more complex than simple batch vessels, the design maintains practicality through standardized flow reactor configurations and integrated heating/cooling systems that are commonly used in industrial chemistry.
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 continuous process enhances temperature control, reduces reaction time, eliminates the need for excess reagents and separation steps, and produces urea urethanes with defined structures, improving the efficiency and quality of the production process.
Implementation Method 1
reacting at least one monohydroxyl compound (a1) with at least one diisocyanate compound (a2) to form an intermediate pre-polymer (b2)
Implementation Method 2
reacting the intermediate pre-polymer (b2) with at least one diamine compound (a3) to form the urea urethane
Implementation Method 3
since the reaction is very exothermic, temperature is difficult to control to avoid formation of unwanted byproducts
Data Source
AI summary
Suggested is a continuous process for the manufacture of urea urethanes, comprising or consisting of the following steps:(a) providingat least one monohydroxyl compound (a1);at least one diisocyanate compound (a2);at least one diamine compound (a3)optionally at least one isocyanate stabilizer (a4);at least one solvent (a5);optionally at least one anti-gelling agent (a6)(b) blending said components (a2) and (a4) to form a first pre-mix (b1);(c) feeding said component (a1) and said first pre-mix (b1) to a first continuous reactor to form an intermediate (b2);(d) blending said components (a3), (a5) and (a6) to form a second premix (b3);(e) feeding said intermediate (b2) and said second premix (b3) to a second continuous reactor to form the urea urethane; and(f) collecting the urea urethane from the second continuous reactor.