Is the extraction column in propane deasphalting operation filled with liquid throughout its entire length?
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As the title says? First exposure to propane deasphalting
During normal operation of the propane deasphalting extraction tower, the entire tower is not completely filled with liquid. The working principle of this extraction tower is to use propane as a solvent to extract the asphaltic components from crude oil; during this process, a separation between the liquid phase and the gas phase takes place. The lower part of the tower is usually the liquid phase zone, where asphalt is dissolved in propane ； The upper part of the tower is the vapor phase zone, which mainly contains evaporated propane and other light components. So, part of the tower is filled with liquid, but not the entire tower. Such a design is intended to ensure effective separation and extraction. .
In an extraction tower, the liquid material is continuously drawn upward; if the tower is filled with liquid, how can there be any flow?
Isn’t extraction a liquid-liquid contact? Did propane flash in the extraction tower? If there is flashing and conversion to the gas phase, isn’t that equivalent to distillation? But extraction is the principle behind distillation
Deasphalting in propane extractive slurry is an extraction process, with the entire tower filled with liquid.