Conclusions
It is recommended to use a mixture based on caprolactam and benzoic acid, with small amounts of added water, for the low-temperature condensation of CL vapor in the synthesis of PCA under vacuum.
Condensation of CL vapor at a temperature below 333°K permits one to return 7–9 kg of CL per ton of polymer to the technological cycle.
The use of low-temperature condensation permits one to reduce the concentration factor of lactam in water from the steam-ejector pumps by a factor of more than 30 and to effect water recycling.
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Literature cited
I. M. Vlasov, O. K. Gubanova, and V. B. Kvasha, Khim. Volokna, No. 1, 18 (1983).
Inventor's Certificate No. 929655 (1982) (USSR).
Ya. I. Gerasimov, V. P. Dreving, et al., A Course in Physical Chemistry [in Russian], Vol. 1, Goskhimizdat, Moscow (1963).
Additional information
Translated from Khimicheskie Volokna, No. 5, pp. 23–24, September–October, 1983.
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Vlasov, I.M., Belyakov, A.V., Gubanova, O.K. et al. Condensation of caprolactam vapor in the synthesis of polycaproamide under vacuum. Fibre Chem 15, 341–344 (1984). https://doi.org/10.1007/BF00548128
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DOI: https://doi.org/10.1007/BF00548128