Modeling of hydrolytic polymerization in a semibatch nylon 6 reactor

Gupta, Alok ; Gupta, S. K. ; Gandhi, K. S. ; Mehta, M. H. (1992) Modeling of hydrolytic polymerization in a semibatch nylon 6 reactor Chemical Engineering Communications, 113 (1). pp. 63-89. ISSN 0098-6445

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Hydrolytic polymerization of caprolactam to Nylon 6 in a semibatch reactor is carried out by heating a mixture of water and caprolactam. Evaporation of volatiles caused by heating results in a pressure build-up. After the pressure reaches a predetermined value, vapors are vented to keep the pressure constant for some time, and thereafter, to lower the pressure to a value slightly above atmospheric in a preprogrammed manner. The characteristics of the polymer are determined by the chemical reactions and the vaporization of water and caprolactam. The semibatch operation has been simulated and the predictions have been compared with industrial data. The observed temperature and pressure histories were predicted with a fair degree of accuracy. It was found that the predictions of the degree of polymerization however are sensitive to the vapor-liquid equilibrium relations. A comparison with an earlier model, which neglected mass transfer resistance, indicates that simulation using the VLE data of Giori and Hayes and accounting for mass transfer resistance is more reliable.

Item Type:Article
Source:Copyright of this article belongs to Taylor and Francis Group.
Keywords:Polymerization; Semibatch; Nylon
ID Code:76441
Deposited On:31 Dec 2011 14:15
Last Modified:23 Jun 2012 09:10

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