Venschott, Moritz; Hoelderich, Wolfgang F.; Eisenacher, Matthias:
2nd Generation PLA; Lactide Formation Directly from Aqueous Lactic Acid
In: Catalysis Communications : An International Journal Dedicated to Rapid Publications in Catalytic Research, Vol. 177 (2023), Article 106636
2023Essay / Article in JournalOpen Access
Faculty of Applied Natural Sciences
Related: 1 publication(s)
Title in English:
2nd Generation PLA; Lactide Formation Directly from Aqueous Lactic Acid
Author:
Venschott, Moritz
SCOPUS
57434887800
;Hoelderich, Wolfgang F.
SCOPUS
7005755884
;Eisenacher, MatthiasTH Köln
DHSB-ID
THK0002573
ORCID
0000-0002-9175-9914ORCID iD
SCOPUS
55257406700
Other
person connected with TH Köln
Year of publication:
2023
„Publication Channel“:
Open Access
DOI
10.1016/j.catcom.2023.106636
Scopus ID
85150931905
Language of text:
English
Appears in
Catalysis Communications : An International Journal Dedicated to Rapid Publications in Catalytic Research
Place of publication:
Amsterdam
Publisher:
Elsevier BV
in:
Vol. 177 (2023), Article 106636
ISSN
1566-7367 Show availability online & print
ZDB ID
2039714-8
ZDB ID
2096232-0
Language of text:
English
Type of resource:
Text
Peer Reviewed:
Peer Reviewed
Practice Partner:
No
Category:
Research
Part of statistic:
Not part of statistic
Keyword, Topic:
Heterogeneous catalysts ; Lactic acid ; Lactide ; PLA ; Polylactic acid
Type of resource:
Text
Access Rights:
open access
Peer Reviewed:
Peer Reviewed
Practice Partner:
No
Category:
Research
Part of statistic:
Part of statistic

Abstract in English:

In order to develop a 2nd generation polylactic acid (PLA) process, lactide (LD) was synthesized directly from a commercially available 90% aqueous lactic acid (LA) solution. Experiments were conducted in an ordinary continuous flow fixed bed reactor. The reaction was carried out over various zeolites and γ-Al₂O₃ catalysts. Furthermore, the influence of pressure, temperature and water content in the inlet was studied. The highest LD selectivity of 98.9% was obtained using 90% LA and γ-Al₂O₃ as catalyst. In addition, it is concluded that LD yield increases when using highly concentrated LA oligomer with a minor amount of water. The catalysts were characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray powder diffraction (XRD), nitrogen adsorption isotherms (BET), temperature programmed desorption of ammonia (NH₃-TPD) and pyridine Fourier transformed infrared spectroscopy (Py-FTIR).