Extraction Reactor Temperature Gradient for Polyamide

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Solution Overview

Problem

Existing extraction reactors face challenges in achieving an optimal temperature gradient and flow control during the extraction of monomeric and oligomeric components from granular polyamide materials, leading to inefficiencies and potential product damage due to hydrolysis and flow reversals.

Innovation Solution

The extraction reactor features a vertically extending flow pipe with multiple horizontally configured heat exchanger elements that create a controlled temperature gradient and uniform flow distribution, allowing for independent adjustment of temperature and flow control, preventing flow reversals and optimizing extraction efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the extraction temperature is increased to improve extraction speed and effectiveness, then the extraction efficiency is improved, but the polyamide material suffers hydrolysis damage

Engineering Contradiction:

Improveextraction efficiencyVSAvoidhydrolysis damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The extraction column is divided into multiple sections with different temperature profiles. The lower section operates at higher temperatures (up to 120°C) for efficient extraction, while the upper section operates at lower temperatures to prevent hydrolysis. This segmentation allows simultaneous optimization of extraction efficiency and material protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the extraction column are assigned different temperature conditions tailored to local requirements. The bottom region uses higher temperatures to enhance extraction kinetics, while the top region maintains lower temperatures to prevent degradation of the polyamide material, creating a non-uniform but optimized temperature distribution.

Inventive Principle:

Principle #3Local quality

2Productivity

If the extraction temperature is increased above atmospheric boiling point, then the extraction effectiveness is improved, but flow reversal occurs due to density changes

Engineering Contradiction:

Improveextraction effectivenessVSAvoidflow distribution

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The extraction column is segmented into multiple temperature zones, with the upper section operating at lower temperatures to maintain stable liquid density and prevent flow reversal, while the lower section operates at higher temperatures for effective extraction. This segmentation decouples the conflicting requirements of high extraction effectiveness and stable flow distribution.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The temperature parameter is varied spatially throughout the extraction column rather than maintaining a uniform high temperature. By changing the temperature profile from the top to bottom, the system achieves high extraction effectiveness in the lower section while maintaining stable flow characteristics in the upper section.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the extraction column height is increased to improve extraction quality, then the extraction effectiveness is improved, but the device complexity and space requirements increase

Engineering Contradiction:

Improveextraction qualityVSAvoidcolumn height

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Different sections of the extraction column are assigned different functional characteristics with tailored temperature profiles. This allows high extraction quality to be achieved through optimized local conditions rather than merely increasing overall column height, reducing the need for excessive vertical space.

Inventive Principle:

Principle #3Local quality

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 configuration enables efficient extraction of monomeric and oligomeric components by maintaining temperatures below the boiling point, preventing hydrolysis, and ensuring consistent flow distribution, even at high capacities, thus enhancing extraction quality and reducing operational costs.

Implementation Method 1

a plurality of heat exchanger elements which fill the cross-section of the flow pipe completely or partially and by means of which a vertical temperature gradient can be produced in the flow pipe

Methodology Applied

Scientific EffectHeat exchange: Heat Exchanger

Implementation Method 2

During the extraction, soluble components can be dissolved out of the granular material with an extraction liquid

Methodology Applied

Scientific EffectSolvation: Solvation

Implementation Method 3

As a result of lower temperature and increasing monomer concentration in the upper part of the extractor, the density of the extraction liquid increases

Methodology Applied

Scientific EffectDensity gradient: Density Gradient

Data Source

PatentUS9708271B2Extraction reactor and also method for extraction from granular material

Publication Date: 2017.07.18 UHDE INVENTA FISCHER

AI summary

The present application relates to an extraction reactor with which granular material, in particular granular polyamide, can undergo extraction, soluble components being dissolved out of the granular material with an extraction liquid during the extraction. In the case of polyamide materials, these are for example oligomeric or monomeric components which have remained in the granular material during the polycondensation reaction for the production of the polyamide materials.