This production plant for emulsion polyvinyl chloride (EPVC) products and was kept continuously updated with several improvements during years.
Initial technology was supplied by Enichem, and continuously improved, therefore now is a proprietary know-how of plant owner.
Nominal production capacity is rated at 75,000 MTPY, but could be increased by 15% with grades mix rationalisation and other minor improvements.
Today, a plant with such capacity should cost some 95 million euro, with about 45 million euro just as equipment cost.
Battery limits include bagging lines for pvc powder, waste water treatment, control motor center, air compression section, etc.
Operations are managed from remote control room by means of a Valmet DCS (today Metzo Jap.) which runs all plant sections. All technical documentation is available.
Plant shut down occurred in year 2009, and equipments are kept with close lids, under N2 atmosphere. Only one vessel still contain some vcm and is planned to be emptied and cleaned by plant operators, shortly.
Main Improvements and Modification (1991-2008) such as:
The process starts with solution preparation for emulsifier agents and other additives.
Then, autoclaves are charged with demineralized water, emulsifiers solutions, VCM, catalysts, additives and heated to start polymerization. Once the reaction starts, cooling water is circulated in the jacket to control temperature. There are (18) 25CuM, C.S. glass lined Schwelmer Autoclaves in operation. All reactors are condenser equipped.
There are an additional (4) installed reactors, without condensers, which are kept out of operations.
At the end of polymerization, the autoclaves are vented to a gasholder and latex is discharged to blow-down vessels, then is fed to stripping section.
This stripping section is designed with (3) stripping columns. Un-reacted VCM is removed from latex by steam injection, and recovered, leaving PVC almost free from toxic gas.
Stripped slurry is fed to storage, then is pumped to the drying section. The drying section is designed with (5) lines: each line has (1) spray dryer, mills, sieves and bag filters.
Produced PVC is sent to hoppers which feed automatic bagging machines. After palletizing the produced PVC is moved to a storage house or directly to trucks.
The original Enichem design was improved and continuously updated introducing several modifications, such as latex stripping technology, which makes today a plant proprietary know-how.
Inside battery limits there is a VCM gasholder and VCM recovery section, waste water stripping, air compressors, fridge for cooling water, compressor for air and cooling towers.
A mass spectrograph is monitoring environment air around plant working areas.
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