About eSUN
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Chemical Recycling
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Polylactic Acids
Polycaprolactones
Polycaprolactone raw material
Lactate Esters
Methyl lactate
Polyol-seriess
3D Printing
PLA Fiber
Biomedical Materials
Disposable Degradable Products
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Chemical Recycling
Chemical recycling holds critical importance because degradation processes often entail resource wastage. Particularly for biodegradable materials, implementing effective chemical recycling strategies aims to reduce such unnecessary waste, promote material circularity, and thereby advance environmental protection.
Recycling processes transform discarded biodegradable materials into valuable resources through physical recycling (such as crushing and sieving) to reuse materials, chemical recycling (such as dissolution and extraction) to obtain valuable components, and biological recycling (utilizing microbial decomposition) for environmentally friendly treatment. These processes help reduce environmental pollution and promote resource circular utilization.
Recycling: Biodegradable Materials
Benefits of PLA Chemical Recycling
Transforms waste PLA into new resources, minimizing material waste
Prevents PLA contamination to preserve ecological integrity
Drives PLA circular utilization to advance sustainability
Research and Industrialization Achievements in Chemical Recycling
Achievement Overview
eSUN’s scientific achievement in "Lactide Production from Lactic Acid & Recycled PLA with Application Technologies" was certified by the China Light Industry Council and academician-led expert panels as reaching internationally advanced levels overall, with pioneering breakthroughs in specific domains.
eSUN has established a closed-loop green circular technology platform spanning biomaterial synthesis, modification, application, and recycling, realizing harmonious coexistence between technology and ecology.
Since 2006, eSUN has pioneered research on PLA recycling and high-value reuse. In 2012, it filed a patent application for "A Method for Preparing Refined Lactide from Recycled Polylactic Acid", granted in 2014. This enables eSUN to produce multiple high-purity & high-value lactate esters from recycled PLA-derived lactide. As the globally pioneered PLA chemical recycling technology, it resolves the worldwide challenge of recycling bio-based degradable materials, establishing a "green circular" economy.
Patents
| No. | Patent Number | Title | Type | Legal Status | Authorization Date |
| 1 | ZL201010262372.3 | Method for producing high-content and high-optical-purity ethyl lactate by a two-step process | Invention Patent (China) | Authorized | 2013.07.10 |
| 2 | ZL201010262356.4 | Method for producing high-content and high-optical-purity butyl lactate by a two-step process | Invention Patent (China) | Authorized | 2013.06.05 |
| 3 | ZL201010262384.6 | Method for producing high-content and high-optical-purity methyl lactate by a two-step process | Invention Patent (China) | Authorized | 2013.08.21 |
| 4 | ZL201010261047.5 | Method for producing high-content and high-optical-purity lactate esters by a two-step process | Invention Patent (China) | Authorized | 2013.10.23 |
| 5 | ZL201010261242.8 | Method for producing high-content and high-optical-purity propyl lactate by a two-step process | Invention Patent (China) | Authorized | 2013.07.10 |
| 6 | ZL201210221914.1 | Method for recovering polylactic acid to prepare refined-grade lactide | Invention Patent (China) | Authorized | 2014.06.11 |
| 7 | ZL201510063085.2 | Method for preparing electronic-grade ethyl lactate | Invention Patent (China) | Authorized | 2016.09.28 |
| 8 | US9475790 B2 | Method for recovering polylactic acid to prepare refined-grade lactide | Invention Patent (USA) | Authorized | 2016.10.25 |
| 9 | ZL201010239065.3 | Method for foaming polylactic acid | Invention Patent (China) | Authorized | 2011.12.28 |
| 10 | ZL201510054929.7 | Method for preparing low-acid-value polylactic acid polyol | Invention Patent (China) | Authorized | 2019.01.15 |
| 11 | ZL201711191894.7 | Process equipment and method for refining lactide | Invention Patent (China) | Authorized | 2020.09.25 |
| 12 | ZL202210188084.0 | Bimetallic aluminum alkyl complex catalyst, preparation method and application in the preparation of lactide and ε-caprolactone random copolymer | Invention Patent (China) | Authorized | 2022.10.21 |
| 13 | 201811623355.0 | Method for preparing electronic-grade propyl propionate | Invention Patent (China) | Pending | |
| 14 | 202010281112.4 | Process method for preparing glycolide from glycolic acid ester | Invention Patent (China) | Pending | |
| 15 | 2022 10237218.3 | Method and device for preparing high-purity L-lactide | Invention Patent (China) | Pending | |
| 16 | 2022 10276619.X | Method and application for preparing urethane-modified polyester acrylate | Invention Patent (China) | Pending |
Standard
| No. | Standard Name | Standard Number | Standard Type | Standard Release Date | Standard Status | Participating Unit |
| 1 | Polycaprolactone Diol | Q/XYS 007-2017 | Corporate Standard | 2017.7.28 | Currently Effective | eSUN |
| 2 | Polycaprolactone Triol | Q/XYS 008-2017 | Corporate Standard | 2017.7.28 | Currently Effective | eSUN |
| 3 | L-Lactide | Q/XYS 006-2022 | Corporate Standard | 2022.6.13 | Currently Effective | eSUN |
| 4 | Polycaprolactone, Polylactide Polyol | Q/XYS 001-2021 | Corporate Standard | 2022.5.18 | Currently Effective | eSUN |
| 5 | Ethyl Lactate | Q/XGYS013-2021 | Corporate Standard | 2022.5.18 | Currently Effective | eSUN |
| 6 | Polylactic Acid (PLA2201) | Q/XYS 005-2022 | Corporate Standard | 2022.6.15 | Currently Effective | eSUN |
Industrialization Achievements: Recycling Facilities
