Growth of epsilon-caprolactam crystals from
the melt: the influence of cyclohexanone on the {11(1)over-bar} and {110}
forms
van den Berg-EPG; Bogels-G; Arkenbout-GJ
JOURNAL-OF-CRYSTAL-GROWTH. JUL 1998; 191 (1-2) : 169-177.
Abstract:
The (1 1 (1) over bar) and (1 1 0) facets of epsilon-caprolactam growing
from the melt appear to grow with different mechanisms. This is
caused by the different molecular structure of the (1 1 1) and the
(1 1 0) facets. Moreover, the cyclohexanone impurity concentration in front
of the
interface changes the growth mechanism leading to different distribution
coefficients for each facet. Usually, in industry overall distribution
coefficients
are used and the crystal form is only of interest because of the filterability
of the crystals. Here it is shown that a second factor, the growth
mechanism of each facet has to be taken into account when considering
the optimal conditions for growing pure crystals.
(C) 1998 Elsevier ScienceB.V. All rights reserved.