Polymerisation Processes Polymerisation Processes Polyethylene ...
Polymerisation Processes Polymerisation Processes Polyethylene ...
Polymerisation Processes Polymerisation Processes Polyethylene ...
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Polyamide 6 - VK column<br />
water<br />
ε-Caprolactame<br />
melting<br />
80°C<br />
preparation<br />
Melt filter<br />
Pre condensation<br />
250°C, 40 bar<br />
Mean residence time VK column ≈ 15 - 30 h<br />
throughput:<br />
≈ 2000 moto<br />
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung <strong>Polymerisation</strong>stechnik, Universität Paderborn, WS 07/08 Polymer processes<br />
M<br />
VK-column<br />
270°C<br />
280°C<br />
Water<br />
granulation<br />
Extractor<br />
95°C<br />
silo<br />
dryer 80°C<br />
PA6-process – modelling of melt process<br />
Model input:<br />
Kinetic scheme and<br />
parameters<br />
Non-ideal phase behavior<br />
using NRTL model<br />
Model output:<br />
Molecular weight<br />
end groups<br />
Residual monomer<br />
Oligomer concentration<br />
Granules<br />
Vacuum<br />
(1 mbar)<br />
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung <strong>Polymerisation</strong>stechnik, Universität Paderborn, WS 07/08 Polymer processes<br />
180<br />
160<br />
140<br />
120<br />
100<br />
80<br />
60<br />
40<br />
20<br />
simulation results taking into account exp. binary VLE date<br />
Extract, %, CL, H2O, Oligomers<br />
NH2-end groups<br />
degree of polymerization<br />
dimer, %<br />
0<br />
0<br />
235 240 245 250 255 260 265 270 275 280<br />
temperature in top of VK-Rohr<br />
1<br />
0.9<br />
0.8<br />
0.7<br />
0.6<br />
0.5<br />
0.4<br />
0.3<br />
0.2<br />
0.1<br />
77<br />
79<br />
PA6-process – modelling of each process unit<br />
Melt polymerization<br />
Schmelzepolymerisation im VK - Rohr Extraction Extraktion of oligomers Trocknung/Temperung<br />
Drying,<br />
N 2<br />
Caprolactam<br />
(+Kettenregler) (+chain regulator + 0,5% + H2O) H 2O Bedingungen:<br />
τ : 9 - 17 h<br />
T : 250 - 280 °C<br />
p : 0 - 0,3 bar<br />
PA 6 - Granules<br />
Extracttwater<br />
Bedingungen:<br />
τ : 17 - 30 h<br />
T : 95 - 120 °C<br />
Water<br />
solid state polymerization<br />
N2 -O2 Granulation<br />
air<br />
Polyamide 6<br />
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung <strong>Polymerisation</strong>stechnik, Universität Paderborn, WS 07/08 Polymer processes<br />
PA6-process – modelling of extraction<br />
Model assumptions:<br />
Nernst law at phase<br />
boundaries<br />
Nernst coefficient dependent<br />
on monomer concentration<br />
Fick diffusion in polymer<br />
phase and liquid boundary<br />
layer<br />
Model output:<br />
Concentration profile of<br />
residual monomer and<br />
oligomer in polymer and<br />
liquid phase<br />
-H 2 O<br />
Bedingungen:<br />
τ : 20 - 40 h<br />
T : 135 - 180 °C<br />
nitorgen<br />
Top2 4 6 8 10 bottom 12<br />
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung <strong>Polymerisation</strong>stechnik, Universität Paderborn, WS 07/08 Polymer processes<br />
10<br />
8<br />
6<br />
4<br />
2<br />
1<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
% extractable<br />
% dimer in granules<br />
Top 2 4 6 8 10 12 bottom<br />
78<br />
80
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