Capacity: 143,000 TPY
Pressure: 150 bar
Temperature: 220°C - 270°C
Product Density: 0.916 - 0.943
Melt Flow Index: 0.55 - 10.5
In this process there are two reactors: a stirred vessel and a tubular reactor. The reaction is a copolymerization of the monomer (ethylene) and the comonomer (butane and octene) carry out by means of a Ziegler-Natta catalysis and taking place in a solvent (cyclohexane) at T=2204C-270°C and P=150bar. The solution leaving the reactor, containing the dissolved polymer, passes through alumina beds which adsorb and remove the catalyst.
The polymer is then separated form both the solvent and the unreacted materials (monomer and comonomer) by means of a pressure drop (taking place in two vessels) which allows the non polymer phase vaporization.
The gases and vapors leaving the separators are sent to the distillation area where they are separated in the following components:
unreacted ethylene (about 4-7% of the feed stream) that is sent to the cracking plant;
cyclohexane that undergoes purification and recycling;
butane and octane that once purified are recycled to the reaction;
by products such as butane-2 (coming form isomerization of butenene-1) and oligomers (low molecular weight polymers) that are sent to the cracking plant
The melted mass obtained is finally sent to the extruder and pelletized. Pellets obtained are then sent to a stripper to reduce the volatile solvent content and afterwards to the blenders where the lot uniformity is achieved.
Finally pellets go to the storage area consisting of 20 silos (250 m3 each) and from there to the packaging area
Ethylene: 145,300 tons
Refine: 18,800 tons
Octane: 5,200 tons
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