Conclusions
As a result of investigation, it has been found that a considerable decrease in the thermal stability of Oksalon fibre is the result of contaminants in the solvent-technical sulfuric acid.
It has been shown that a bulk bed of fireclay has an incomparably greater sludge capacity than the best flexible or rigid filter media, and can be used effectively for filtering sulfuric acid.
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Literature cited
A. A. Konkin (editor), Heat- and Fire-resistant and Incombustible Fibres [in Russian], Khimiya, Moscow (1978), pp. 135–148.
A. H. Frazer and I. M. Sarasohn, “Thermal behavior of polyhydrazides and poly-1,3,4-oxadiazoles,” J. Polym. Sci., A4, No. 7, 1649–1664 (1966).
Methods and Apparatus Design for Filtration of Viscous Solutions through Built-Up and Bulk Materials [in Russian], NIITÉKhIM, Moscow (1973).
Additional information
Translated from Khimicheskie Volokna, No. 1, pp. 29–30, January–February, 1983.
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Matveev, V.S., Oprits, O.V., Vasil'ev, V.I. et al. Filtration of concentrated sulfuric acid. Fibre Chem 15, 33–36 (1983). https://doi.org/10.1007/BF00545504
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DOI: https://doi.org/10.1007/BF00545504