Journal
CHEMICAL ENGINEERING JOURNAL
Volume 166, Issue 2, Pages 523-528Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.11.010
Keywords
PET; Benzene; Hydrolysis; Decarboxylation; Purity; Heating rate
Categories
Funding
- Ministry of Education, Science, Sports, and Culture [30241532]
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Poly(ethylene terephthalate) (PET) was hydrolysed and decarboxylised, using a calcium oxide filled column under several thermal conditions, in order to obtain high yields of high purity benzene. The reactions of the hydrolysis of PET and the subsequent decarboxylation of the resulting terephthalic acid were successfully separated by a sophisticated temperature management. While hydrolysis proceeded well at temperatures below 500 degrees C, the decarboxylation proceeded with a sufficient velocity at about 500 degrees C. The yield and purity was strongly determined by the extent to which hydrolysis and decarboxylation were separated. At temperatures higher than the optimal temperature for hydrolysis, the resultant side reactions led to both a lower yield and purity of the product, while few by-products were observed when the hydrolysis was completed before the decarboxylation started. The best results were achieved at a heating rate of 2 K min(-1) between 300 degrees C and 500 degrees C, with a benzene yield of 74% and a purity of 97 wt.%. (C) 2010 Elsevier B.V. All rights reserved.
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