Lactide production from polymer waste

Anzhelika Posvyashchennaya, Tatiana Volgina, Viktor Novikov, Alexey Zinovyev

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The method of thermal depolymerization of polylactide wastes and products from it has been studied. At a temperature of 200-250 °C and a pressure of 5-10 mbar the maximum yield of crude lactide and pure lactide is 40% and 5.5% by weight accordingly. The addition of catalysts (Zn, ZnO, SnO, C16H30O4Sn, Sb2O3) in an amount from 0.5 to 2.0% by weight makes it possible to intensify the process and increase the monomer yield by 3-10 times. The maximum amount of lactide (∼60 wt%) is achieved by using tin octoate (1.5 wt%) as the catalyst. The findings product is a mixture that consist of D-, L-lactide (∼80 wt%) and m-lactide (∼4 wt%) isomers, lactic acid (∼2 wt%), oligomer of lactic acid (∼14 wt%), water (<1 wt%), and has a melting point 92-96 °C.

Original languageEnglish
Title of host publicationHigh Technology
Subtitle of host publicationResearch and Applications 2017
EditorsGeorgii E. Osokin, Ekaterina A. Kulinich
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)9783035712810
Publication statusPublished - 1 Jan 2018
Event6th International Conference for Young Scientists High Technology: Research and Applications, HTRA 2017 - Tomsk, Russian Federation
Duration: 27 Nov 201729 Nov 2017

Publication series

NameKey Engineering Materials
Volume769 KEM
ISSN (Print)1013-9826


Conference6th International Conference for Young Scientists High Technology: Research and Applications, HTRA 2017
CountryRussian Federation


  • Depolymerization catalysts
  • Lactide production
  • Polylactide
  • Thermal depolymerization

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Lactide production from polymer waste'. Together they form a unique fingerprint.

  • Cite this

    Posvyashchennaya, A., Volgina, T., Novikov, V., & Zinovyev, A. (2018). Lactide production from polymer waste. In G. E. Osokin, & E. A. Kulinich (Eds.), High Technology: Research and Applications 2017 (pp. 17-22). (Key Engineering Materials; Vol. 769 KEM). Trans Tech Publications Ltd.