LPG C5 content

Increasing the stabilization pressure and reducing the temperatures at the top and bottom of the stabilizer allows for an appropriate increase in reflux

Boost voltage and cool down! The solution is to remove the heat source and increase the reflux!

The pressure remains generally constant, with stable control; the bottom and top temperatures are reduced

(1) Low reflux flow or high temperature at the top of the stabilizer; high tower top temperature leads to a high C5 content in the liquefied gas. (2) Low pressure in the stabilizer results in a high C5 content in the liquefied gas. (3) High temperature at the bottom of the stabilizer causes a high C5 content in the liquefied gas. (4) A decrease in the feed volume to the stabilizer or an increase in its temperature leads to a high C5 content in the liquefied gas. (5) Water being present in the feed to the stabilizer results in a sharp increase in the C5 content in the liquefied gas

How much higher? Say a number. Is the bottom distillate qualified? How long has it been going on? ? If it’s not too high, reduce the reflux slightly; lowering the top temperature a bit will suffice. If it’s much higher, remove some heat from the bottom of the tower. Also, if both the upper and lower levels are not up to standard, it is necessary to consider whether it is caused by water in the feed material or significant changes in operating conditions. . . .

1. Factors affecting it: ① Low reflux flow at the top of the stabilizer, or high reflux temperature. ② The outlet temperature of the reboiler at the bottom of the tower is high. ③ The stabilizer tower pressure is low, or the pressure is unstable. ④ The feed temperature is high, and the feed position is relatively high. ⑤ Bottom liquid level control failure (no liquid level). ⑥ Tray blockage causes gas-liquid entrainment or tower flooding. (2) Regulation method: The C5 content in liquid hydrocarbons is primarily controlled by regulating the bottom temperature, top temperature, and pressure of the stabilizer. ①Appropriately increase the reflux volume, raise the reflux ratio, and lower the reflux temperature ； ②Reduce the temperature at the outlet of the reboiler while ensuring that the quality of the gasoline remains satisfactory ； ③Select the appropriate feed port based on the feed temperature to improve distillation efficiency ； ④Control the liquid level at the bottom of the stabilizer tank ； ⑤Slightly increase the pressure in the stabilizer tower ； ⑥When the tray becomes clogged, operations must be stopped for treatment ； ⑦When the tray is blocked, on one hand, make every effort to maintain stable operation of the stabilizer; on the other hand, consult the workshop for guidance on how to handle the situation. There are procedures for dealing with such issues; just read more books

There are many reasons; the main methods are to reduce the bottom temperature of the tower, increase the top pressure, and reduce the absorption dose

As mentioned on floor 4, let’s go straight to it~ First, try lowering the top and bottom temperatures: P

There are two scenarios: if it is only the high C5 content in the liquefied gas, and the flash point of the bottom oil is within acceptable limits, then it is a problem related to fractionation; in such cases, the tower pressure should be increased and the temperature reduced accordingly； If the flash point of the bottom oil is also not up to standard, it indicates poor separation efficiency; in such cases, the reflux ratio should be increased, and methods such as pressurization and cooling can be used as supplementary measures ； If the problem still cannot be resolved, it may be due to a clogged tray or an issue with the tower’s design.

Increase the stabilization pressure, reduce the temperature at the bottom of the tower, appropriately increase the reflux, and control the liquid level at the bottom of the stabilization tower

The most effective approach is to control the C5 content in the raw materials

1. Increase the pressure at the top of the stabilizer; different units employ various methods for pressure control. 2. Increase the cold reflux. 3. Reduce the temperature at the top of the tower. 4. Lower the temperature of the cold reflux; reduce the temperature at the bottom of the stabilizer. 5. Use the lower feed inlet of the stabilizer; increase the number of plates in the distillation section. When controlling quality issues at the top of the tower, pay attention to the initial boiling point of the product at the bottom of the tower, steam pressure, and fractionation issues