Dual-Chamber Polymer Polyol Reactor for Low-Viscosity Batch Processing
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Solution Overview
Problem
Existing polymer polyol production methods face challenges in achieving low viscosity and high operating flexibility while maintaining equipment investment and versatility, with continuous processes leading to large equipment investment and batch processes lacking elasticity.
Innovation Solution
A reaction system with a reactor divided into two chambers by a partition plate, utilizing circulation units with coolers and heaters, and a flow direction switching unit to control temperature and material flow, allowing for batch production of low-viscosity polymer polyol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If continuous process is used to prepare polymer polyol, then viscosity is reduced and particle-size distribution is widened, but equipment investment increases and operating flexibility decreases
Solution Approach 1:
The reaction system is divided into multiple reaction zones within a single reactor, including a first reaction zone for initial polymerization and a second reaction zone for further reaction. This segmentation allows the system to achieve continuous-like performance in a batch reactor configuration, reducing viscosity effectively while avoiding the need for complex continuous equipment infrastructure.
2Device complexity
If batch process is used to prepare polymer polyol, then equipment investment is reduced and operating flexibility is improved, but viscosity remains high and versatility is poor
Solution Approach 1:
The batch reactor is equipped with dynamic circulation and exchange systems that enable the reaction mixture to circulate between different reaction zones and allow for mid-process adjustment of reaction conditions. This dynamic capability enables a batch reactor to achieve low viscosity results typically associated with continuous processes, while maintaining equipment simplicity and operational flexibility.
3Device complexity
If traditional single-chamber reactor is used, then structure is simple, but temperature control precision and reaction uniformity are insufficient
Solution Approach 1:
The reactor is divided into multiple reaction zones with independent temperature control systems. Each zone can be controlled at different temperatures to optimize specific reaction stages, achieving precise temperature control and uniform reaction conditions while maintaining a relatively simple overall structure that builds upon the traditional single-chamber design.
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 system achieves low-viscosity polymer polyol with stable polymerization, reducing reactor fouling and cleaning frequency, and produces polyurethane foam with high hardness and mechanical strength, adjusting particle size distribution.
Implementation Method 1
the first circulation unit is provided with a cooler for cooling materials
Implementation Method 2
the second circulation unit is provided with a heater for heating materials
Implementation Method 3
the top of the partition plate is provided with an overflow port to communicate the first reaction chamber and the second reaction chamber with each other
Data Source
AI summary
A reaction system for preparing polymer polyol and a method for preparing polymer polyol. The reaction system comprises a reactor, a first circulation unit, a second circulation unit, and a flow direction switching unit, wherein the reaction cavity of the reactor is divided into a first reaction chamber and a second reaction chamber by a partition plate, and the top of the partition plate is provided with an overflow port to communicate the first reaction chamber and the second reaction chamber with each other; the first circulation unit enables the material in the first reaction chamber to circulate between the discharge port of the first reaction chamber and the feed port of the first reaction chamber; the second circulation unit enables the material in the second reaction chamber to circulate between the discharge port of the second reaction chamber and the feed port of the second reaction chamber. The polymer polyol prepared by the reaction system has a low-viscosity effect, and by using the polymer polyol prepared by the method, a polyurethane foam having excellent mechanical properties and high hardness can be obtained.