The pumps for increasing the pressure of the liquid CO2 play a key role in the CO2 extraction process, because these pumps can be reliably adapted to the CO2-conditions. Pressure generation and volumetric flow control is preferably accomplished by a positive dis- placement pump, which is able to meet the high demands concerning controllability and constant flow volume and can therefore be very well adapted to the properties of CO2. By minimizing the dead space, an oscillating positive displacement pump is able to achieve a very good volumetric efficiency, despite the high compressibility of liquid carbon dioxide. Due to the high process pressures and the relatively low flow vo- lumes, this pump type is particularly suitable for CO2-extraction.
Uraca’s positive displacement pumps achieve the demanded process data in combination with a good rate of efficiency and guarantee exact compliance with the parameters most economically. This stability results from the excellent proportionality of rotary speed and flow volume and its almost complete independence from the process pressure.
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