Efficient depolymerization and chemical conversion of polyamide 66 to 1,6-hexanediol

Polyamide 66 was efficiently depolymerized and chemically converted by treatment with supercritical MeOH in the presence of glycolic acid. The dicarboxylic acid unit of the polymer was selectively converted to dimethyl adipate, while the diamine unit of the polymer was converted to 1,6-hexane diol v...

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Veröffentlicht in:Journal of material cycles and waste management 2017-01, Vol.19 (1), p.326-331
Hauptverfasser: Matsumoto, Hiroshi, Akinari, Yugo, Kaiso, Kouji, Kamimura, Akio
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container_title Journal of material cycles and waste management
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creator Matsumoto, Hiroshi
Akinari, Yugo
Kaiso, Kouji
Kamimura, Akio
description Polyamide 66 was efficiently depolymerized and chemically converted by treatment with supercritical MeOH in the presence of glycolic acid. The dicarboxylic acid unit of the polymer was selectively converted to dimethyl adipate, while the diamine unit of the polymer was converted to 1,6-hexane diol via a tetramethyldiamine intermediate. The reaction in the absence of glycolic acid was sluggish, and the yields of the diester and the diol were poor. Thus, glycolic acid efficiently catalyzed the reaction to produce 1,6-hexanediol in high yield.
doi_str_mv 10.1007/s10163-015-0425-4
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subjects Acids
Chemicals
Chromatography
Civil Engineering
Conversion
Depolymerization
Diamines
Dicarboxylic acids
Dimethyl
Diols
Engineering
Environmental Management
Fluids
Glycolic acid
Plastics
Polyamide resins
Polyamides
Polymers
Recycling
Special Feature: Original Article
Statistical analysis
Waste Management/Waste Technology
title Efficient depolymerization and chemical conversion of polyamide 66 to 1,6-hexanediol
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