Download Recycling of Polyurethane Wastes by Mir Mohammad Alavi Nikje PDF
By Mir Mohammad Alavi Nikje
Recycling of polyurethane (PU) wastes is undertaken to minimise waste and decrease environmental toxins. during this publication, those tools are investigated to discover an appropriate strategy for waste relief, safeguard of our environment, and prevention of waste landfilling. This booklet experiences features from modern literature (including author's examine) concentrating on those issues. lately, growth has been performed by way of the author's study crew in chemical recycling of PU waste.
Recycling tools are said truly, in addition to use of instrumental tools similar to nuclear magnetic resonance spectroscopy and Fourier-Transform infrared spectroscopy for characterisation and identity of recycling items. This publication presents new and intriguing outlooks for locating enough recycling equipment in addition to the beginning fabrics and intermediates for PU products.
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Additional info for Recycling of Polyurethane Wastes
Example text
Completion of this reaction at 190–230 °C yields high-quality polyols, isomeric toluene diamines (TDA), and CO2 as primary products. Kinetic analyses of TDA yield versus time suggest a parallel first-order reaction scheme wherein urethane linkages react ≤50× faster than urea linkages. Results derived from kinetic investigations have demonstrated that urethane linkages are broken by direct hydrolysis, whereas urea linkages undergo thermal dissociation to the parent isocyanate and amine. Hydrolysis of PUF and recovery of diamines and polyethers (or polyesters) from the hydrolysate would be carried out near atmospheric pressure and temperatures >185 °C.
M. H. Agha Mohammadi, Polymer– Plastics Technology and Engineering, 2010, 49, 8, 818. 38. M. Alavi Nikje in Proceedings of the 2nd International IUPAC Conference on Green Chemistry, 14–19th September, St. Petersburg, Russia, 2008. 1 Introduction and Background Because of industrial use of polyurethane(s) (PU) integral skin foams, the first focus is on chemical recycling on foam wastes received from production lines of steering wheels and arm rests. New styling trends, surface design, safety functions, and comfort are made possible by application of integral skin polyurethane foams (PUF).
Based on an efficient logistic framework, energy recovery can become the most cost-effective recovery option. More needs to be done to establish the infrastructure throughout Europe, but incineration with energy recovery is crucial to suitable management of plastic waste (including PU). The relative cost of the different energy-recovery options to society is similar for mono-combustion or for use as co-fuel for cement kilns. However, the cost of collection, sorting, pretreatment and transport might add considerably to the overall cost.