Continuous Cellulose Reactor Homogeneity Control

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Solution Overview

Problem

Current methods for processing cellulose-containing starting materials, such as old textiles, involve batch processes that require numerous work steps, complex measurement and control technologies, and high energy consumption due to varying material compositions and the need for continuous adjustment of process conditions.

Innovation Solution

A continuous method for producing a cellulose-comprising starting material with a predefined composition, where the composition is adjusted by selectively enriching or depleting components to match a target value, allowing for continuous processing in a single reactor unit, reducing the need for complex control systems and energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a discontinuous batch process is used to process cellulose-containing starting materials with varying compositions, then the process can adapt to different material compositions, but the number of work steps increases, device complexity increases, and energy consumption increases

Engineering Contradiction:
Improveadaptability to varying material compositionsVSAvoidcomplexity of measurement and control systems
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies homogeneity by pre-mixing the cellulose-containing starting material with the reaction medium before feeding into the continuous reactor. This ensures uniform composition throughout the process stream, eliminating the need for complex real-time measurement and control systems that would be required if batch processes were used to handle varying compositions. The continuous process maintains homogeneous conditions throughout the reactor.

Inventive Principle:
Principle #33Homogeneity

Solution Approach 2:

The patent implements continuity by replacing the discontinuous batch process with a continuous flow process. The starting material is continuously fed into the reactor along with the reaction medium, and the reaction proceeds continuously without interruption. This eliminates the need to repeatedly fill, heat, process, and empty batch reactors, thereby reducing device complexity and energy consumption while maintaining adaptability through continuous composition control.

Inventive Principle:
Principle #20Continuity of useful action

2Adaptability or versatility

If a discontinuous batch process is used, then process conditions can be individually adapted to each batch composition, but energy consumption increases due to repeated heating and cooling cycles

Engineering Contradiction:
Improveindividual adaptation of process conditionsVSAvoidenergy consumption
Core Design Contradiction:
Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The continuous process maintains the reactor at constant operating conditions continuously, eliminating the repeated heating and cooling cycles inherent in batch processes. The reaction medium and starting material are continuously mixed and processed at steady-state conditions, dramatically reducing energy consumption while still adapting to composition variations through continuous flow control.

Inventive Principle:
Principle #20Continuity of useful action

Solution Approach 2:

The patent uses parameter changes by adjusting the flow rates and composition of the starting material and reaction medium in the continuous process. Instead of changing temperature and pressure repeatedly as in batch processes, the continuous process adapts to composition variations by modifying flow parameters and residence time, thereby reducing energy consumption associated with thermal cycling.

Inventive Principle:
Principle #35Parameter changes

3Ease of manufacture

If multiple individual units are used for discontinuous processing, then each unit can be optimized for specific steps, but the overall system size increases and compact integration is eliminated

Engineering Contradiction:
Improveoptimization of individual processing stepsVSAvoidsystem size
Core Design Contradiction:
Ease of manufactureVSVolume of moving object

Solution Approach 1:

The patent merges multiple discrete batch processing units into a single continuous reactor system. The continuous process combines mixing, reaction, and product formation in one integrated flow system, eliminating the need for multiple separate units. This reduces the overall system size and volume while maintaining the ability to optimize processing conditions through continuous flow control and residence time management.

Inventive Principle:
Principle #5Merging (Combining)

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 approach enables efficient, robust, and resource-saving production of cellulose-comprising starting materials, improving throughput, reducing energy use, and simplifying process control, while maintaining stable process conditions.

Implementation Method 1

The cooking unit is then heated in order to dissolve the lignin, for example in the case of wood chips, and enable the extraction of cellulose.

Methodology Applied
Scientific EffectChemical dissolution: Solvation

Implementation Method 2

The cooking unit is then heated in order to dissolve the lignin

Methodology Applied
Scientific EffectThermal heating: Heating

Data Source

PatentEP3980596B1Method for continuously producing a cellulose-comprising prepared material
Publication Date: 2024.09.11 LENZING AG
  • EP3980596B1 patent drawingFigure 1
  • EP3980596B1 patent drawingFigure 2
  • EP3980596B1 patent drawingFigure 3

AI summary

The invention relates to a process for continuously preparing a broken-up, cellulose-containing starting material (110), in particular, a starting material for forming a cellulose shaped body (102). The process comprises: i) supplying (10) a cellulose-containing starting material (101) which is a solid material, having a predefined composition to a reactor device (105), ii) continuously preparing (20) the starting material (101) in the reactor device (105) in order to obtain the broken-up cellulose-containing starting material (101) and iii) discharging (30) the broken-up prepared cellulose-containing starting material (110) from the reactor device (105).