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CNRS

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Postdoctoral Researcher in Valorisation of Paraffinic Waxes from Residue Pyrolysis CNRS in France

Degree Level

Postdoc

Field of study

Chemistry

Funding

Available

Deadline

Nov 24, 2026

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Country

France

University

CNRS

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Keywords

Chemistry
Environmental Science
Chemical Engineering
Materials Science
Polymer Chemistry
Rheology
Material Characterization
Pyrolysis

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About this position

This postdoctoral project is part of WAXUP, a recycling chemistry project funded under the French PEPR Recyclage programme (France 2030). The work targets the valorisation of solid residues from multilayer packaging recycling, especially the polyAl fraction remaining after hydropulping of cartons such as Tetra Pak®.

The scientific goal is to transform these residues by slow pyrolysis into high-value paraffinic waxes that can replace petro-sourced waxes in industrial formulations. The project aims to support a more circular route for plastic-rich waste streams while developing waxes suitable for use in elastomer systems, including applications relevant to tyre materials.

The postdoctoral researcher will work on the production, recovery, characterisation, and application of these waxes. A major part of the project concerns the design and optimisation of a modular stepped condensation train combining electro-precipitation and fractionated falling-film condensation to capture wax aerosols and separate them from oxygenated compounds originating from cellulosic fibres.

The role also includes tuning process variables to improve wax purity and yield, then analysing how pyrolysis and condensation conditions affect the molecular and structural properties of the recovered waxes. The candidate will use techniques such as GPC, X-ray diffraction, and Py-GC-MS to study molar mass, branching, and composition.

Another core task is the integration of unpurified waxes into model elastomer formulations based on natural rubber, polybutadiene, and fillers. The project will examine their effect on processing and rheology during mixing, as well as their potential migration behaviour for anti-ozone protection.

The research will be carried out at the Centre RAPSODEE at IMT Mines Albi for wax production, with collaboration involving the Universidade Federal do ABC in Brazil. The project is explicitly collaborative, with joint integration and synthesis of results across the two laboratories.

Funding details

Available

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