Polymerisation Processes Polymerisation Processes Polyethylene ...
Polymerisation Processes Polymerisation Processes Polyethylene ...
Polymerisation Processes Polymerisation Processes Polyethylene ...
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Solution Coordinative <strong>Polyethylene</strong> <strong>Processes</strong><br />
Solution process:<br />
• broad range of comonomer types and densities possible<br />
• pure products<br />
• limitation: high molecular weight (high temperature, transfer to solvent)<br />
• temperature well above melting point of PE<br />
• commercial processes:<br />
• processes with very short residence time, e.g. 2 min:<br />
• Nova Sclairtech / Advanced Sclairtech<br />
• Sabic / Stamicarbon Compact solution process<br />
• processes with longer residence time e.g. 30 min:<br />
• Dowlex<br />
• Mitsui<br />
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung <strong>Polymerisation</strong>stechnik, Universität Paderborn, WS 07/08 Polymer processes<br />
Solution Coordinative <strong>Polyethylene</strong> <strong>Processes</strong><br />
Sclairtech Dowlex<br />
temperature 200 - 300 °C 160 °C<br />
pressure bis zu 100 bar 27 bar<br />
solvent cyclohexane C8 / C9 paraffines<br />
Residence time approx. 2 min approx. 30 min<br />
heat removal: convective convective and conductive<br />
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung <strong>Polymerisation</strong>stechnik, Universität Paderborn, WS 07/08 Polymer processes<br />
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Solution Coordinative <strong>Polyethylene</strong> <strong>Processes</strong><br />
Flowsheet for solution polymerization (DSM)<br />
Ethylen<br />
Comonomer<br />
solvent<br />
Solvent recycle<br />
venting<br />
Additives<br />
Absorber Reactor Flash-Tank<br />
Mixer<br />
Extruder<br />
Additive<br />
solvent Hexane<br />
Temperature 130°C<br />
Residence time ~ 10 min<br />
Solid content < 10 %<br />
adiabatic<br />
High space time yield<br />
Reactor volume 5 m 3 for 5 t HDPE/h<br />
Solvent purification<br />
Flash<br />
-Tank<br />
HDPE-Granules<br />
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung <strong>Polymerisation</strong>stechnik, Universität Paderborn, WS 07/08 Polymer processes<br />
Slurry Coordinative <strong>Polyethylene</strong> <strong>Processes</strong><br />
Slurry process:<br />
• developed for HDPE<br />
• Limitation: low density, low molecular weight: partial solubility of the polymer<br />
in the suspension media, fouling<br />
• suitable for densities above 930 kg/m³ resp. 920 kg/m³ (with SSC)<br />
• CSTR‘s or slurry-loop reactors used<br />
• suspension media: paraffines, e.g. hexane, isobutane<br />
• many commercial processes:<br />
• processes with loop reactor<br />
• Phillips Loop<br />
• Solvay<br />
• processes with stirred tank reactors<br />
• Hostalen<br />
• Mitsui CX<br />
Dr. Klaus-Dieter Hungenberg, BASF AG Ludwigshafen Vorlesung <strong>Polymerisation</strong>stechnik, Universität Paderborn, WS 07/08 Polymer processes<br />
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