Recovery of Terephthalic Acid and Ethylene Glycol from Poly(ethylene terephthalate) under Hydrothermal Conditions of Aqueous Trimethylamine Solution

2012 ◽  
Vol 51 (16) ◽  
pp. 5699-5704 ◽  
Author(s):  
Natsumi Wakabayashi ◽  
Tomoharu Kojima ◽  
Toshitaka Funazukuri
Keyword(s):  
Ethylene Glycol ◽  
Terephthalic Acid ◽  
Ethylene Terephthalate ◽  
Hydrothermal Conditions ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Depolymerization of Poly(ethylene terephthalate) to Terephthalic Acid and Ethylene Glycol in High-temperature Liquid Water

2009 ◽  
Vol 38 (3) ◽  
pp. 268-269 ◽  
Author(s):  
Osamu Sato ◽  
Eiichi Mine ◽  
Mitsumasa Osada ◽  
Norihito Hiyoshi ◽  
Aritomo Yamaguchi ◽  
...  
Keyword(s):  
High Temperature ◽  
Ethylene Glycol ◽  
Liquid Water ◽  
Terephthalic Acid ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Temperature Liquid ◽  
Poly Ethylene

Microwave-assisted esterification step of poly(ethylene terephthalate) (PET) synthesis through ethylene glycol and terephthalic acid

2018 ◽  
Vol 76 (6) ◽  
pp. 2931-2944 ◽  
Author(s):  
Ana Christy Espinosa-López ◽  
Carlos Alberto Ávila-Orta ◽  
Francisco Javier Medellín-Rodríguez ◽  
Pablo González-Morones ◽  
Carlos Alberto Gallardo-Vega ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Terephthalic Acid ◽  
Ethylene Terephthalate ◽  
Microwave Assisted ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Synthesis of ethylene glycol and terephthalic acid from biomass for producing PET

2016 ◽  
Vol 18 (2) ◽  
pp. 342-359 ◽  
Author(s):  
Jifeng Pang ◽  
Mingyuan Zheng ◽  
Ruiyan Sun ◽  
Aiqin Wang ◽  
Xiaodong Wang ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Terephthalic Acid ◽  
Ethylene Terephthalate ◽  
Recent Advances ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

This review presents recent advances in typical routes for drop-in replacement of poly(ethylene terephthalate) monomers from biomass.

Ethylene Glycol and Glycerin as the Solvent for Alkaline Treatment of Poly(ethylene Terephthalate) Fabrics

1997 ◽  
Vol 67 (10) ◽  
pp. 760-766 ◽  
Author(s):  
M.-C. Yang ◽  
H.-Y. Tsai
Keyword(s):  
Ethylene Glycol ◽  
Degradation Rate ◽  
Ethylene Terephthalate ◽  
Treatment Time ◽  
Alkaline Treatment ◽  
Aqueous System ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Kinetics Of ◽  
Scanning Electron

Poly(ethylene terephthalate) fabrics are treated with sodium hydroxide using ethylene glycol or glycerin as the solvent. Compared with conventional aqueous alkaline hydrolysis, the degradation rate in ethylene glycol increases tenfold. The kinetics of the alkaline-ethylene glycol treatment show that the weight loss is linear with respect to time. The moisture regain rate and tensile properties of the treated fabrics are measured; other tests include scanning electron microscopy and dyeing properties. The results show that the properties of the treated fabrics do not depend significantly on the solvent; therefore, using ethylene glycol can greatly shorten the treatment time to achieve results similar to those with the conventional aqueous system.

Dynamic Step-Scan Two-Dimensional Fourier Transform Infrared Studies of Uniaxially Drawn Poly(Ethylene Terephthalate) Film

1996 ◽  
Vol 50 (3) ◽  
pp. 377-381 ◽  
Author(s):  
Masashi Sonoyama ◽  
Kunihiro Shoda ◽  
Gen Katagiri ◽  
Hideyuki Ishida
Keyword(s):  
Ethylene Glycol ◽  
Phenyl Ring ◽  
Ethylene Terephthalate ◽  
High Mobility ◽  
Two Dimensional ◽  
Poly Ethylene Terephthalate ◽  
Dynamic Spectra ◽  
Infrared Studies ◽  
Poly Ethylene ◽  
Mechanical Stretching

Dynamic infrared spectra of uniaxially drawn poly(ethylene terephthalate) (PET) under a sinusoidal strain were examined. A very intense dynamic band at 973 cm−1 assigned to the trans C-O stretching mode indicated stress-induced high mobility around the C-O bond in the ethylene glycol units. It was supposed that derivative-like skeletal bands observed in the dynamic spectra originated from the stress-induced frequency shift. Two-dimensional correlation analyses of the dynamic spectra were also carried out and revealed that the phenyl ring 18a band at 1018 cm−1 and the phenyl ring 19b band at 1410 cm−1 were composed of three and two independent components, respectively. The correlation peaks between the phenyl ring and CH2 vibrational modes showed that orientation of the methylene group in the ethylene glycol unit, induced by mechanical stretching, is faster than that of the phenyl ring in the terephthalate unit.

scholarly journals Development of a targeted gene disruption system in the PET-degrading bacterium Ideonella sakaiensis and its applications to PETase and MHETase genes

2021 ◽  
Author(s):  
Shin-ichi Hachisuka ◽  
Tarou Nishii ◽  
Shosuke Yoshida
Keyword(s):  
Terephthalic Acid ◽  
Parent Strain ◽  
Gene Disruption ◽  
Ethylene Terephthalate ◽  
Targeted Gene Disruption ◽  
Degrading Bacterium ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Pet Hydrolase

Poly(ethylene terephthalate) (PET) is a commonly used synthetic plastic; however its non-biodegradability results in a large amount of waste accumulation that has a negative impact on the environment. Recently, a PET-degrading bacterium Ideonella sakaiensis 201-F6 strain was isolated and the enzymes involved in PET-digestion, PET hydrolase (PETase) and mono(2-hydroxyethyl) terephthalic acid (MHET) hydrolase (MHETase), were identified. Despite the great potentials of I. sakaiensis in bioremediation and biorecycling, approaches to studying this bacterium remain limited. In this study, to enable the functional analysis of PETase and MHETase genes in vivo , we have developed a gene disruption system in I. sakaiensis . The pT18 mobsacB -based disruption vector harboring directly connected 5'- and 3'-flanking regions of the target gene for homologous recombination was introduced into I. sakaiensis cells via conjugation. First, we deleted the orotidine 5'-phosphate decarboxylase gene ( pyrF ) from the genome of the wild-type strain, producing the Δ pyrF strain with 5-fluoroorotic acid (5-FOA) resistance. Next, using the Δ pyrF strain as a parent strain, and pyrF as a counterselection marker, we disrupted the genes for PETase and MHETase. The growth of both Δ petase and Δ mhetase strains on terephthalic acid (TPA, one of the PET hydrolytic products) was comparable to that of the parent strain. However, these mutant strains dramatically decreased the growth level on PET to that on no carbon source. Moreover, the Δ petase strain completely abolished PET degradation capacity. These results demonstrate that PETase and MHETase are essential for I. sakaiensis metabolism of PET. IMPORTANCE The poly(ethylene terephthalate) (PET)-degrading bacterium Ideonella sakaiensis possesses two unique enzymes able to serve in PET hydrolysis. PET hydrolase (PETase) hydrolyzes PET into mono(2-hydroxyethyl) terephthalic acid (MHET) and MHET hydrolase (MHETase) hydrolyzes MHET into terephthalic acid (TPA) and ethylene glycol (EG). These enzymes have attracted global attention as they have potential to be used for bioconversion of PET. Compared to many in vitro studies including the biochemical and crystal structure analyses, few in vivo studies have been reported. Here, we developed a targeted gene disruption system in I. sakaiensis , which was then applied for constructing Δ petase and Δ mhetase strains. Growth of these disruptants revealed that PETase is a sole enzyme responsible for PET degradation in I. sakaiensis , while PETase and MHETase play essential roles in its PET assimilation.

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