What is the pressure at the top of the vacuum tower?
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How high should the pressure at the top of the vacuum tower be controlled? Feed section pressure?
It depends on the level of vacuum you need and what the main product is used for
The vacuum level at the top of the vacuum distillation tower is generally maintained above 92–93, which means the absolute pressure is below 8 Kpa–9 Kpa. The pressure in the feed section depends on the amount of reflux and the conditions of the gas and liquid phases inside the tower; it is usually about 2 Kpa lower than that at the top of the tower. (This is my personal opinion; there is no theoretical basis for it.) The value can also vary significantly depending on the type of packing used in the vacuum distillation tower. There are also many factors that have an impact, such as the oil transfer line of the vacuum furnace, etc
The vacuum level at the top of the vacuum distillation tower is generally maintained above 98–99
The vacuum level achieved with the reduced-top method I use is generally 91–94 KPa
It’s generally kept at around –0.01 Mpa