Simulation of nylon 6 polymerization in tubular reactors with recycle

Gupta, Santosh K. ; Kunzru, D. ; Kumar, Anil ; Agarwal, K. K. (1983) Simulation of nylon 6 polymerization in tubular reactors with recycle Journal of Applied Polymer Science, 28 (5). pp. 1625-1640. ISSN 0021-8995

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In the hydrolytic polymerization of ε -caprolactam, the ring opening of the monomer is much slower than the polyaddition reaction. Hence, the mixing of aminocaproic acid to the feed results in a faster conversion of the monomer. Industrially, this fact is exploited by using a recycle stream. An isothermal plug flow reactor (PFR) with a recycle is simulated in this study, using two techniques: the method of successive substitutions and Wegstein's method. It is found that, under certain operating conditions, the use of a recycle stream gives higher monomer conversions and lower cyclic dimer concentrations than either a PFR or a homogeneous continuous-flow stirred-tank reactor (HCSTR), with the degree of polymerization almost the same as that obtained in an HCSTR, and thus offers a considerable advantage. However, when a recycle reactor is coupled with a subsequent flashing operation and a finishing reactor, these advantages are considerably reduced.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons, Inc.
ID Code:14208
Deposited On:12 Nov 2010 08:51
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