SUSPENSION-PVC Process
The SUSPENSION Process for manufacturing polyvinyl chloride is the most important method to produce a variety of general purpose and highly sophisticated grades of PVC. In 1935, this method was invented and patented by WACKER CHEMIE GmbH, one of the former parent companies of VINNOLIT. Continuous developments had been done in recipes, product quality and technology. Due to this long experience and continuous improvements, VINNOLIT can offer a modern and highly economic process for the production of S-PVC worldwide.
Process Description:
The polymerization reaction is carried out batchwise in stirred reactors of the "high performance reactor" type, in sizes up to 170 m3 each. Number and size of the reactors is depending on capacity and product mix. The unique design of this type of reactor allows a very efficient heat-removal out of the reactor, so high productivity rates can be achieved without using of reflux condenser technology or chilled water.
 | The Vinnolit High Performance Reactors with 115 m3 reactor volume are operated at Vinnolit’s Production site in Knapsack, near Cologne, Germany. | |
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Optimized reactor design, the use of high effective build-up suppressants and modern recipes make it possible to operate the reactors for more than one year without opening and high-pressure cleaning procedure.
Simultaneous charging procedure of hot water and VCM reduces charging time and eliminates additional heat up in the process.
The variable process allows the production of PVC grades with k-values between 50 and 75.
Degassing and drying of the PVC slurry will be done in the continuous degassing and drying process. The low VCM content in the final product is achieved with the high efficient, proprietary VINNOLIT degassing column. To avoid stress and thermal degradation of the product, stripping of the remaining VCM is carried out under moderate conditions with steam.
The main characteristics of the VINNOLIT SUSPENSION Process can be summarized as:
· clean and closed reactor technology
· high productivity of 600 t/m3/y and more
· economic raw material and energy consumption
· low investment cost
· los maintenance cost
· high safety level
After degassing, the PVC slurry is dewatered in decantation centrifuges. Drying of the PVC is carried out in the VINNOLIT CYCLONE DRYER. Gentle drying conditions, no thermal degradation of the product, uniform moisture content, no electrostatic phenomena, no moving parts inside the CYCLONE DRYER, no corrosion problems and low energy consumption are the main characteristics of this modern drier. The heat up of the drying air can be done by steam or natural gas.
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