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Every Thing about Distillation Column

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  1. Anonymous4 November 2019 at 23:46

    Thank you for sharing this blog.Video is also informative. Get more information about Distillation Column.

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How do refineries calculate Height of Equivalent Theoritical Plate (HETP) for distillation column ?

Typically, refineries don’t calculate it themselves but get the companies selling them the packing to guarantee performance. Prior to that, they or the company contracted to do their construction, would come up with an estimate. There is no simple “grand unifying theory” for HETP. For the design of packed distillation columns it is simpler to treat the separation as a staged process. Use the concept of the height of an equivalent equilibrium stage or HETP (Height Equivalent to theoretical plate) to convert the number of ideal stages required to a height of packing. HETP is the height of packing that will give the same separation as an equilibrium stage. Eckert (1975) has shown that in distillation the HETP for a given type and size of packing is essentially constant , and independent of the system physical properties ; providing good liquid distribution is maintained and the pressure drop is at least above 17 mm water per meter of packing height. Follo
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How to select Heating and cooling utilities used in Chemical Industries ?- A comparison study.

as we all know that without utilities plants can not run.. so it is very important to study the utilities used in the chemical plants, mostly in the heat exchanger or any heating and cooling equipment selection of utilities plays important role... So firstly what is Utilities?? Utility is inseparable part of process plant It is not counted directly as a product, which leaves company premises. But ignoring them may have significant effect on overall profit Input and Output from Process Plant Hear some of the utilities are listed .. Steam  Cooling water  Air  Refrigerant  Brine   Hot oil   Hydrogen   Inert gas (Nitrogen, Helium, Argon)  Electricity etc...  Now commonly as a cooling utility we have 2 option available  1. Cooling Water 2. Cooling Air.. So now thing is how to select from this two? so for that comparison is given below.. Cooling Water  Higher Heat Transfer co-efficient compared air. Highest temperature
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How will increasing/decreasing the pressure of the distillation tower affect flooding?

Flooding occurs if vaporization rate of reboiler is higher, then liquid partially carryover by the vapors from below tray to above tray, if it is continue then liquid hold up on the above tray increases and causes flooding Naturally we don’t want to over pressure the tower and open the safety valve, Same way if tower pressure goes too low then we could not condense the reflux, then the liquid level in reflux drum would fall and the reflux pump would lose suction. Now Take 1. Raising the tower pressure Higher pressure reduce volumatric flow of vapor, (As the Pressure is inversely proportional to Volume), So increasing the tower pressure does not Causes Flooding but its a one of the option to reduce the effect of Flooding . Now the question is why we are increases the Tower Pressure? so the answer is to permit higher reflux rates. 2. Decreasing the tower pressure Generally Distillation columns are operated at low pressure, Because as the tower pressure will decrease
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