What temperature do the distillation temperatures of each side stream represent? ?
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What temperature do the distillation temperatures of each side stream essentially represent, and how do the various components affect them? ?
The dew point temperature of the oil at that pressure.
What does the distillation temperature of each side stream essentially represent? It is the dew point temperature of the oil obtained from each side stream. How do the various components affect this temperature? The distillation temperature determines the composition of the oil obtained; at higher temperatures, the components become heavier； Low temperature, light components. The components of the extracted product are influenced by temperature control.
The side-line distillation temperature should be the temperature of the oil collection tank for that layer. Generally, when there are more light components, the temperature is lower. The distillation temperature is also related to the amount of distillate.
Each side stream is distilled at its dew point temperature, so its temperature should be its dew point temperature! The temperature level determines the severity and yield of the side-stream oil; a higher distillation temperature increases the yield, but it makes the properties of the oil more severe! If it is possible to ensure that all products meet the required standards, efforts should be made to distill out as many products with higher market prices as possible!
The distillation temperatures of the various side streams in the fractionation tower are the bubble points of those side stream products at the vapor pressure of the hydrocarbons at that location, as the side stream products are taken out in liquid form； The top temperature is the bubble point temperature of the tower top product under the vapor pressure of the overhead gas, as the tower top product is withdrawn in vapor form. The bubble point and dew point temperatures are related to the mixture composition and system pressure.
For a distillation column, the top temperature of the column corresponds to the dew point temperature of the product under the conditions of temperature and pressure at the column top, while the temperature at the side streams corresponds to the bubble point temperature. This temperature is closely related to the equilibrium vaporization temperature of the product, and it is also closely related to the actual boiling point temperature. Therefore, when controlling the quality of the product, the temperature at which the material is drawn off from the side streams is what is directly controlled.
The side-line extraction temperature is the most direct indicator of the lightness or heaviness of the distillate products. For example, in a hydrocracking fractionator, the side-line extraction temperature is closely related to the 95% point of diesel; an increase in the extraction temperature leads to an increase in the 95% point of diesel, all other conditions remaining constant, and vice versa.