PMMA Depolymerization Recycling of Impurities for Monomer Purity

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Solution Overview

Problem

Existing methods for depolymerizing polymethyl methacrylate (PMMA) to recover methyl methacrylate (MMA) face inefficiencies in processing solid and liquid impurities, leading to impure monomer solutions and waste products like syrups, which are difficult to recycle.

Innovation Solution

A depolymerization process involving a pyrolysis reactor and condenser system that includes feeding solid and liquid impurities back into the pyrolysis reactor at controlled temperatures, along with a syrup containing polymer and oligomers, and using a gas cleaning unit to improve monomer purity and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If solid and liquid impurities are removed from the gas stream, then monomer purity is improved, but recycling efficiency deteriorates because the impurities cannot be processed

Engineering Contradiction:

Improvemonomer purityVSAvoidrecycling efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent converts the harmful impurities (solid and liquid residues) into a beneficial resource by feeding them back into the pyrolysis reactor along with syrup containing polymer and oligomers. This allows the impurities to undergo further depolymerization and generate additional monomer, transforming waste material into valuable product and improving overall recycling efficiency.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

Instead of discarding the solid and liquid impurities removed from the gas stream, the patent recovers them by feeding them back into the pyrolysis reactor. This recovery process allows the impurities to be processed further and converted into usable monomer, eliminating waste and improving resource utilization.

Inventive Principle:

Principle #34Discarding and recovering

2Productivity

If higher mass flow rates are processed, then productivity is improved, but energy consumption increases

Engineering Contradiction:

Improvemass flow rateVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent implements continuous processing by feeding solid and liquid impurities back into the pyrolysis reactor in a continuous manner along with the syrup. This continuous recycling process allows the system to maintain high mass flow rates without proportionally increasing energy consumption, as the impurities are processed in an ongoing cycle rather than requiring separate batch treatments.

Inventive Principle:

Principle #20Continuity of useful action

3Productivity

If impurities are fed back into the pyrolysis reactor, then recycling efficiency is improved, but monomer purity may deteriorate

Engineering Contradiction:

Improverecycling efficiencyVSAvoidmonomer purity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent employs a feedback mechanism where solid and liquid impurities removed from the gas stream are fed back into the pyrolysis reactor along with syrup containing polymer and oligomers. This feedback loop allows continuous processing and conversion of impurities into monomer, improving recycling efficiency while maintaining product quality through controlled depolymerization.

Inventive Principle:

Principle #23Feedback

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 process enhances monomer solution purity and recycling efficiency by effectively processing impurities, increasing yield and reducing mechanical energy needs, while allowing for higher mass flow rates with the same energy consumption.

Implementation Method 1

pyrolizing the feed material in the pyrolysis reactor so as to generate a gas stream

Methodology Applied

Scientific EffectPyrolysis: Pyrolysis

Implementation Method 2

condensing the monomer contained in the gas stream in the condenser such as to obtain liquid monomer

Methodology Applied

Scientific EffectCondensation: Condensation

Data Source

PatentUS20260085031A1Method and installation for the production of a monomer by depolymerization of the corresponding polymer

Publication Date: 2026.03.26 ARKEMA FRANCE SA

AI summary

The production method comprises the steps of:pyrolizing the feed material in a pyrolysis reactor so as to generate a gas stream, the feed material travelling from an inlet of the pyrolysis reactor to an outlet of the pyrolysis reactor with being subjected to heat such as to generate the gas stream at the outlet of the pyrolysis reactor; andcondensing the monomer contained in the gas stream in a condenser such as to obtain liquid monomer;the production method further comprising feeding the pyrolysis reactor with solid and/or liquid impurities separated from the gas stream generated in the depolymerization installation and/or a gas stream generated in another depolymerization installation and/or with a syrup containing the polymer and/or the monomer and/or oligomers of the monomer.