The early stage of carbonization of petroleum pitches has been studied by in-situ, hightemperature 'H-NMR and ESR techniques. Well-resolved 'H-NMR spectra were found to provide cletailed information about the mesophase formation in the course of pyrolysis. The process of mesophase generation during
High-pressure high-temperature ESR in early stage of carbonization of pitch
β Scribed by T. Yokono; S. Iyama; Y. Sanada; K. Makino
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 283 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
Letters to the Editor
624 Isotropic Very fine-gralned mosdlc5 Fine-grained mosd~cs Flow domaln anlsotfopi elongated Fig. 1. Relation between D/A and size and extent of optical texture in coke. extended to various coals, pitches and their blending sys-2. T. Yokono, H. Marsh and M. Yokono, Fuel 60, 507 tems. (1981).
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An autoclave-type 'H NMR probe has been developed to monitor the carbonization process of such carbonaceous materials as coal and pitch under high pressures up to 10 MPa. In the early stages of the carbonization of pitch, the change in hydrogen aromaticity, fHe, was found to be dependent on the appl
The temperature dependence of the 'H-NMR absorption in coats and pitches have been obtained using a pulsed Fourier transform NMR spectrometer with a high temperature probe. The samples as received were heated in the high temperature probe and NMR spectra were obtained simultaneously. With increasing