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Recovery of multiple polyol grades from complex flexible polyurethane foams by depolymerization with alkanolamines.

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This study introduces a novel chemical recycling method for polyurethane (PU) foams using diethanolamine (DEA), achieving high recovery rates of valuable aromatic amines like methylenedianiline (MDA) through efficient three-phase separation.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Chemistry

Background:

  • Chemical recycling of polyurethane (PU) foams faces challenges due to complex formulations, leading to low yields of valuable products.
  • Existing methods struggle with multi-polyol systems, limiting the recovery of aromatic amines.

Purpose of the Study:

  • To develop a novel chemical depolymerization method for PU foams to enhance the recovery of aromatic amines.
  • To optimize reaction conditions for efficient three-phase separation and maximize product yield.

Main Methods:

  • Investigated chemical depolymerization of PU foams using diethanolamine (DEA).
  • Evaluated reaction parameters: temperature, time, and DEA:PU ratio.
  • Analyzed separated phases to determine component distribution and product purity.
  • Applied the method to various PU foam types, including MDI- and TDI-based foams with multiple polyols.

Main Results:

  • Identified optimal conditions (240°C, 30 min, DEA:PU 2:1) for clear three-phase separation.
  • Achieved 89% recovery of methylenedianiline (MDA) from PU foams.
  • Polyols were recovered in the top and middle phases, while MDA and DEA were concentrated in the bottom phase.
  • Demonstrated method's versatility on complex MDI- and TDI-based foams with up to five polyols.

Conclusions:

  • The DEA-mediated depolymerization offers an efficient route for chemical recycling of complex PU foams.
  • Aminolysis is the primary reaction pathway, with urea intermediates decomposing into aromatic amines.
  • A predictive room-temperature test reliably indicates the feasibility of three-phase separation.
  • Alkanolamines, such as 2-aminoethanol, can also facilitate three-phase separation, highlighting potential for broader application.