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.
We have developed a Fourier transform infrared spectrometer, the absorption cell of which is utilized as a plasma reactor by winding the rf coil around it to couple directly the rf power. The infrared absorption spectra of some fragmented and synthesized molecules produced in the rf glow-discharge plasma are observed by employing five source gases: CO2, CD4, CF4 (in Kr), SF6, and a N2/O2 mixture. The measurements are made at 0.5 cm−1 apodized resolution on 7.5 and 7.8 MHz rf frequencies with the input rf power ranging between 30–75 W. The products assigned at present are: carbon monoxide in CO2 plasma, CD2H2 in CD4 plasma, and nitrous oxide (N2O) in a N2/O2-mixture plasma. A strong but not clearly assigned spectrum of fragmented molecules in SF6 plasma can also be observed.
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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