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Chemical recycling of flexible PVC by oxygen oxidation in NaOH solutions at elevated temperatures

✍ Scribed by T. Yoshioka; K. Furukawa; T. Sato; A. Okuwaki

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 149 KB
Volume: 70
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(19981003)70:1<129::aid-app13>3.0.co;2-2

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✦ Synopsis

Oxidative degradation of a flexible PVC pellet (F-PVC) with oxygen was carried out in 1-25-mol/kg(m)-H 2 O NaOH solutions, at 150 -260°C and P O 2 1-10 MPa. Dehydrochlorination of F-PVC occurred first, followed by oxidation. The major products were oxalic acid, a mixture of benzenecarboxylic acids, and CO 2 . We obtained 320 g of oxalic acid and 130 g of benzenecarboxylic acids (as phthalic acid) from 1 kg of F-PVC under conditions of a 15-m NaOH solution at 250°C and a P O 2 of 5 MPa for 5 h.

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Dehydrochlorination behavior of flexible

Dehydrochlorination behavior of flexible PVC pellets in NaOH solutions at elevated temperature

✍ Shun-Myung Shin; T. Yoshioka; A. Okuwaki 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 256 KB 👁 1 views

Flexible PVC pellets were treated at 150-250ЊC in 0-7M NaOH solutions for 0-12 h. The degree of dehydrochlorination of flexible PVC pellets increased with increasing reaction temperature and was about 100% at 250ЊC over 5 h. A porous char, 2-16 mm in pore size, was produced. The dehydrochlorination