could pls any one suggest me in distillation column at what situation adjust the reflux?

Question

simply pls explain to me about trays efficiency in distillation column

Answer 1

Its not actually very simple, needs mass and heat balances over whole distillation column system and some rules of thumb used in design generally to make analysis manageable. If you are talking about an existing system, if the system has capacity (look at design parameters) increasing the reflux will improve the purity of the products. If products are unnecessarily pure reducing reflux will save energy.

Answer 2

It is imperative that if you are increasing reflux you needs purity.If the system is balanced with heat and mass and despite you needs to adjust reflux there is some thing wrong with design with respect to reflux location and tray design.if u want to improve the efficiency u can redesign the tray or replace the tray (eg. from bubble cap to valve tray keeping disk and donnet at the bottom.)find out the bubble point of the mixture and fix the reflux at the bubble point.There are many options but u didn't mention the type of column.So , if the product is well within limit you can reduce the reflux gradually, but if the product purity is out of range , then depending on your parameters of ur distillation column you have to act accordingly.You can avoid a column if two or more columns are in line and previous column is giving desired results.We have save 65 lac rupees by comparing results and isolating column.

Answer 3

It really depends on what you are trying to seperate. Assuming you have no azeotropes, more trays gives you more seperation abliity. It is really a function of thermodynamic phase properties. Multi-species distiallation requires more knowlege of the system An ideal column assumes equilibrium on each stage, this doesn't happen only partially.

The column is made up of an absorbtion and a refracting section. The absorbtion section heavy components from the gas move into the liquid, in the refracting section lighter components go from the liquid into the gas.

Tray efficiency is defined three ways, the first is overall efficiency (the number of trays theoretically needed over the actual number of trays in the column to achieve seperation). the second, vaporization efficiency, how well the liquid transfers to the gas phase, third murphee efficiency (equilibrium related).

Answer 4

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