Kinetics of hydrolytic polymerization of ε-caprolactam: 3. Formation of cyclic dimer

Arai, Yoshihiro; Tai, Kazuo; Teranishi, Hiroichi; Tagawa, Takashi

doi:10.1016/0032-3861(81)90218-4

Cited by 55 publications

(108 citation statements)

References 9 publications

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“…transamidation in dry nylon of 6.0 kg 2 /mol 2 /h at 230ЊC (from the constants in Table II). By conExamination of kinetic rates for the formation of caprolactam (Table II) 12 shows these Because the primary difficulty when determining interchange rate constants is the reservation that rates to be second order in end group concentration. This is consistent with reverse polyaddition reverse polycondensation followed by forward polycondensation might account for the interbeing the dominant formation route, not ring closing.…”

Section: Implications For Interchange Reactionsmentioning

confidence: 99%

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A comprehensive model for nylon melt equilibria and kinetics

Mallon

Ray

1998

J. Appl. Polym. Sci.

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ABSTRACT:A model for handling the effect of water on nylon equilibria and kinetics has been developed and tested. Observed variations in the equilibria and kinetics are attributed to microscopic phenomena, not an empirical expression. The equilibrium variation is modeled based on two states of water in the nylon melt, and the kinetic variation is modeled as due to a changing dielectric constant. All reactions are assumed to be acid catalyzed. Results are good at water to polymer ratios ranging from 0.01 to 30 and from temperatures from 200 to 280ЊC. The model framework also allowed the calculation of interchange rates and ring oligomer concentrations. The model is compared with published data and other proposed models.

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Section: Implications For Interchange Reactionsmentioning

confidence: 99%

“…In fact, modern quantitative experimental techniques neither Ogata nor Steppan et al compared their have come primarily from two groups. [11][12][13] There models against data that were not used to fit the does not seem to be a consensus yet regarding the model. correct way to model these concentrations.…”

Section: Figurementioning

confidence: 99%

A comprehensive model for nylon melt equilibria and kinetics

Mallon

Ray

1998

J. Appl. Polym. Sci.

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“…Timo, hr 16 imp1,ying that the minor errors in their derivations do not influence the final results substantially. A significant conclusion that was reached from a comparison of this study (run 3) using equations for moments with our previous r e s u l t~l~*~~ using direct integration of species equations was that in the presence of monofunctional acid stabilizers, the conversion, A,, and p were almost indistinguishable.…”

Section: Resultsmentioning

confidence: 97%

Simulation of three‐stage nylon 6 reactors with intermediate mass transfer at finite rates

Gupta

Kumar

Agrawal

1982

J of Applied Polymer Sci

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SynopsisA three-stage isothermal nylon 6 reactor with a kinetic scheme incorporating ring opening, polycondensation, polyaddition, cyclic dimer formation, and reaction with monofunctional acids has been modeled. In the first and third stages, removal of the condensation by-product, water, is prevented. The second stage of this sequence, however, involves finite rates of diffusion of water to cocurrently flowing inert gas bubbles. The number-average chain length of the polymer obtained in this reactor differs substantially from that obtained assuming instantaneous water removal and is a function of the various design variables. It is observed that several choices of these design variables can be made to obtain the same product, thus emphasizing the need for more comprehensive optimization studies than hitherto carried out.

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“…. - (8,9), and shows rather complicated distribution, while, in the concentration map of CL, monotonical decrease is only recognized from center to wall and from top to bottom except the 9th stream.…”

Section: Temperature Distribution In Trmentioning

confidence: 89%

The simulation of hydrolytic polymerization of ϵ‐caprolactam in various reactors

Tai

Arai

Tagawa

1982

J of Applied Polymer Sci

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SynopsisThe concrete simulation models dealiig with the kinetic behavior of the hydrolytic polymerization of e-caprolactam (CL) in various polymerization reactors used in the industry were described, and the method for their numerical solutions was presented. The characteristic data of the polymerization such as the concentrations of CL, end group, water, c-aminocaproic acid, cyclic dimer, and the hot-water-soluble component, conversion, number average, and weight average molecular weights, and solution and melt viscosities can be calculated at every stage of the polymerization reaction, at every part of the reactors, and/or at the outlet of the reactors. The calculated values based upon the models were found to be quite compatible with the observed values for the reactors. The applicability of the technique was well confirmed for the quality control, process control, modification of existing plants, and development of new chemical process plants.

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Kinetics of hydrolytic polymerization of ε-caprolactam: 3. Formation of cyclic dimer

Cited by 55 publications

References 9 publications

A comprehensive model for nylon melt equilibria and kinetics

A comprehensive model for nylon melt equilibria and kinetics

Simulation of three‐stage nylon 6 reactors with intermediate mass transfer at finite rates

The simulation of hydrolytic polymerization of ϵ‐caprolactam in various reactors

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