Distillation calculation
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The calculation method of clear separation of key components is a classic for ordinary distillation. Can it be calculated like this for mixed distillation with isomers? The calculation methods for multi-component distillation can be classified into two categories, the approximate simplified method and the step-by-step strict method. The approximate simplification rule takes the entire distillation column or a column section as the system and adopts some simplifying assumptions for calculation. Although the calculation results are not accurate enough, the calculation workload is small and the calculation is fast. In some cases, such as preliminary screening of design plans, determination of the initial value of strict method calculation, and rough analysis of the influence of certain parameters of the distillation process, it still has its value. In a multi-component mixture, when the light key component or the heavy key component has isomers, is this method still useful? This post was last edited by Jin Yuruixiang on 2009-3-12 11:22 ]
Maybe it can be used, can the conditions be more specific?
Light component 71% of which: 36% of light key components account for about 51% of light components and 29% of heavy components.: Heavy key component 13%, accounting for about 45% of the heavy component Other isomers A: 5% Isomer B: 11%
It can be used. Many isomers have different boiling points and can be completely separated by distillation.
In a multi-component mixture, when there are isomers of light key components or heavy key components, it is necessary to separate the light and heavy key components first, and then divide the isomers. This post was last edited by tt80111 on 2009-3-13 09:42 ]
It mainly depends on the physical properties of the isomers. If the difference in boiling points is large enough, it should be possible to separate them.
It can be calculated using a multi-component distillation program, which does not matter the key components.
Yes, it can be calculated programmatically. But I don’t have a distillation calculation program, and I don’t know if the currently developed program can calculate pressurized distillation. What should I do if some bubble point equations don’t have 3kg/cm2 pressure data?
Using a program to calculate, why is the tower diameter only 1800 when using atmospheric pressure distillation, but 3000 when calculating the tower diameter using 4kg/cm2 conditions?
When doing the material balance of the entire tower, you can only choose one calculation plan.； Option 1: lk 36% hk 29% (assuming all isomers are one component) Option 2: lk 36% Hk 13% (adjacent main components) I don’t know which method is more accurate?
Option 1 is more like drawing on engineering experience and using the results reference method to accurately calculate； The software simulation method is more reliable, and the second option is somewhere in between. Even with software, people with a higher level of craftsmanship are required to control it.
To separate isomers, if it is possible to use crystallization, adsorption, freezing and other methods, the above methods can generally be used. If the boiling point difference is small, distillation separation will consume too much energy and require a large investment.
There is no pressurized data. If you want to estimate, I have a set of data.: When the absolute pressure increases from 1.03kg/cm to 3.12kg/cm2, the load of the tower can be increased by 72% and the operating temperature of the tower is increased, which is beneficial to energy recovery.