Why is C5 present in liquid hydrocarbons?

Liquid hydrocarbons contain a small amount of C5 and are harmless

The main issue is that the temperature at the top of the tower isn’t well controlled; by regulating this temperature properly, things will be fine. Of course, it’s also necessary to pay attention to the appropriate reflux ratio and tower pressure. As for the hazards! There are requirements for the products; if your factory uses MTBE as a feedstock, it is necessary to pay attention to controlling the content of C5 compounds. I suggest you read more of the operating procedures compiled by your factory’s staff.

This post was last edited by 276957697 on 2010-8-25 02:28. Under ideal conditions, distillation can achieve complete separation, but in practical operations, due to various factors, the mixture cannot be completely separated. It is normal for liquefied gas to contain C5. An increase in C5 leads to an increase in liquefied gas residues. Adjustments: 1. Reduce the bottom temperature of the stabilizer appropriately, as long as it ensures that the vapor pressure of the stabilized gasoline remains within acceptable levels. 2. Lower the top temperature and increase the reflux ratio. 3. Reduce the feed temperature to the stabilizer. 4. Adjust the feed inlet of the stabilizer to use drawing from below as much as possible, in order to increase the distillation section. 5. Slightly increase the top pressure of the tower. 6. Equipment-related issues, such as low open ratio and tray blockage.

Liquefied gas contains C5 compounds, primarily due to inadequate catalytic absorption and stabilization processes. The original four-column design of gas fractionation units included a column for removing C5 compounds, but operating this column required high energy levels, which made it uneconomical from an energy-saving perspective. As a result, modern units rarely include such a column. Under normal conditions, C5 has little impact; however, if an MTBE production unit is present downstream, it can be toxic to the etherification catalysts. But with ongoing technological advancements, catalysts capable of handling high levels of C5 are now being used, thus resolving this issue as well. Finally, when the remaining liquefied gas is used for household purposes, especially in cold temperatures, more residue tends to remain in the containers. Therefore, it is necessary to remove this residue before filling and to conduct regular inspections.

Liquid hydrocarbons contain a small amount of C5, which is harmless but reduces the yield of gasoline. (1) Under normal circumstances, the reflux flow at the top of the stabilizer is adjusted to control the temperature at the top of the stabilizer, thereby regulating the C5 content in the liquefied gas ； (2) Appropriately reduce the temperature at the bottom of the stabilizer tower ； (3) Slightly increase the stabilizer column pressure ； (4) Promptly address the issue of water carried over in the deethanization process ； (5) Adjust operations in a timely manner to maintain stability in the temperature, pressure, flow rate, and liquid level of the stabilizer tower. Maintain stable feed and withdrawal rates at the stabilizer tower ； (6) Adjust the stabilizer feed inlet.

C5 content in liquefied gas is generally very low, around 0.1. During the operation of the stabilizer tower, both C4 and C5 are key components; C4 is the light key component, while C5 is the heavy key component. The product at the top of the stabilizer necessarily contains some heavy key components, namely C5 in the liquid hydrocarbons.

It vaporizes easily, so it will disappear during transportation