CAS OpenIR  > 研究所(批量导入)
Urea as an efficient and reusable catalyst for the glycolysis of poly(ethylene terephthalate) wastes and the role of hydrogen bond in this process
Alternative TitleGreen Chem.
Wang, Qian1; Yao, Xiaoqian1; Tang, Shaofeng2; Lu, Xingmei1; Zhang, Xiangping1; Zhang, Suojiang1
2012
Source PublicationGREEN CHEMISTRY
ISSN1463-9262
Volume14Issue:9Pages:2559-2566
AbstractMetal salts and solid super acids are the common catalysts used in the glycolysis of poly(ethylene terephthalate)(PET) wastes to obtain monomer bis(hydroxyethyl) terephthalate (BHET) with high conversion of PET and selectivity of BHET, but there are some drawbacks, such as severe reaction conditions, slow reaction rates and difficult recycling of the catalyst. In this study, urea, as a green, highly active, low-priced, extensive and easily produced catalyst, has been used for the degradation of PET to give BHET. The experimental results show that the catalyst has a high catalytic activity, fast reaction rate and is easily separated from the product. Then the effects of experimental parameters on the conversion of PET and the selectivity of BHET were investigated. The conversion of PET wastes is able to reach up to 100% under the conditions of m(PET wastes) : m(ethylene glycol (EG)) : m(urea) = 1 : 4 : 0.1, atmosphere pressure at 160 degrees C for 2.5 h. The recycling experiments showed that urea worked efficiently, even though it has been used ten times. In addition, the mechanism was proposed through in situ IR, density functional theory (DFT) calculations and experimental results. It shows that the hydrogen bonds (H-bonds) formed between EG and urea play a key role. Following on from this, five tetraalkylammonium-based amino acid-functionalized ionic liquids were synthesized and were used in the catalytic glycolysis of PET. The experimental results and DFT calculations further verify the important role of H-bonds in the glycolysis process of PET catalyzed by this type of carbonyl-containing catalysts.; Metal salts and solid super acids are the common catalysts used in the glycolysis of poly(ethylene terephthalate)(PET) wastes to obtain monomer bis(hydroxyethyl) terephthalate (BHET) with high conversion of PET and selectivity of BHET, but there are some drawbacks, such as severe reaction conditions, slow reaction rates and difficult recycling of the catalyst. In this study, urea, as a green, highly active, low-priced, extensive and easily produced catalyst, has been used for the degradation of PET to give BHET. The experimental results show that the catalyst has a high catalytic activity, fast reaction rate and is easily separated from the product. Then the effects of experimental parameters on the conversion of PET and the selectivity of BHET were investigated. The conversion of PET wastes is able to reach up to 100% under the conditions of m(PET wastes) : m(ethylene glycol (EG)) : m(urea) = 1 : 4 : 0.1, atmosphere pressure at 160 degrees C for 2.5 h. The recycling experiments showed that urea worked efficiently, even though it has been used ten times. In addition, the mechanism was proposed through in situ IR, density functional theory (DFT) calculations and experimental results. It shows that the hydrogen bonds (H-bonds) formed between EG and urea play a key role. Following on from this, five tetraalkylammonium-based amino acid-functionalized ionic liquids were synthesized and were used in the catalytic glycolysis of PET. The experimental results and DFT calculations further verify the important role of H-bonds in the glycolysis process of PET catalyzed by this type of carbonyl-containing catalysts.
KeywordIonic Liquids Depolymerization Pet Hydrolysis Kinetics Solvent
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1039/c2gc35696a
URL查看原文
Indexed BySCI ; CCR
Language英语
WOS KeywordIONIC LIQUIDS ; DEPOLYMERIZATION ; PET ; HYDROLYSIS ; KINETICS ; SOLVENT
WOS Research AreaChemistry
WOS SubjectChemistry, Multidisciplinary
WOS IDWOS:000307785100028
Citation statistics
Cited Times:40[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6517
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing Key Lab Ion Liquids Clean Proc, Beijing 100190, Peoples R China
2.Henan Univ, Coll Chem & Chem Engn, Kaifeng 475001, Peoples R China
Recommended Citation
GB/T 7714
Wang, Qian,Yao, Xiaoqian,Tang, Shaofeng,et al. Urea as an efficient and reusable catalyst for the glycolysis of poly(ethylene terephthalate) wastes and the role of hydrogen bond in this process[J]. GREEN CHEMISTRY,2012,14(9):2559-2566.
APA Wang, Qian,Yao, Xiaoqian,Tang, Shaofeng,Lu, Xingmei,Zhang, Xiangping,&Zhang, Suojiang.(2012).Urea as an efficient and reusable catalyst for the glycolysis of poly(ethylene terephthalate) wastes and the role of hydrogen bond in this process.GREEN CHEMISTRY,14(9),2559-2566.
MLA Wang, Qian,et al."Urea as an efficient and reusable catalyst for the glycolysis of poly(ethylene terephthalate) wastes and the role of hydrogen bond in this process".GREEN CHEMISTRY 14.9(2012):2559-2566.
Files in This Item:
File Name/Size DocType Version Access License
Urea as an efficient(1938KB) 限制开放CC BY-NC-SAApplication Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wang, Qian]'s Articles
[Yao, Xiaoqian]'s Articles
[Tang, Shaofeng]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wang, Qian]'s Articles
[Yao, Xiaoqian]'s Articles
[Tang, Shaofeng]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wang, Qian]'s Articles
[Yao, Xiaoqian]'s Articles
[Tang, Shaofeng]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.