Xylene deoxygenation
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The bottom oil from the reformed oil fractionation tower is sent to the clay column to have its olefins removed, and then to the xylene column. Why is the clay column placed before entering the xylene column? Wouldn’t it be better to locate it on the process line between the xylene column’s reflux pump and the tank area?
It is not only xylene that needs its olefins removed; the heavy aromatics at the bottom of the tower also need to have them removed
Your method removes olefins from mixed xylene, but how do you remove the olefins present in the aromatic Reorganization components at the bottom of the tower? Do I also need to extract it from the bottom of the tower and add clay?
The heavy gasoline (C9+) extracted via the side line is used as a component in gasoline blending; trace amounts of olefins can be ignored. The heavy fractions at the bottom of the tower are sent for diesel hydrogenation or stored separately before being shipped out – is it necessary to send them all to the clay column?
How do you control the temperature and pressure of your clay?
After the white clay is sent out under reflux, how do you control its space velocity? How do you deal with his side effects?
The pressures of both the xylene reflux pump and the bottom pump of the distillation column are around 16 kilograms. The temperature of the xylene exiting the reflux tank is 200°C; it first enters the clay tower (with the original bypass cooler used to regulate the temperature entering the clay tower). The liquid level control valve for the reflux tank is located behind the clay tower, after which the fluid goes to the heat exchanger and air cooler, before reaching the intermediate tank area. This process should enable effective control of the temperature and pressure of the fluid entering the clay tower.
What about the side reaction products of white clay? How to remove it?
Why is white clay placed in front of the tower? Because in clay or the currently popular molecular sieve catalysts, the polymers and high-boiling-point compounds formed as a result of the reaction are carried away from the bottom of the tower along with the heavy aromatics, thereby ensuring that parameters such as the bromine index of the products at the upper part of the tower meet the required standards.
Thank you, I see. The main issue is that the side reaction products cannot be removed, which affects the quality of xylene.