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Conditions favouring tray columns:
- variable liquid and/or vapour loads
- low liquid rates · large number of stages and/or diameter
- high liquid residence time
- dirty service (plate columns are easier to clean)
- presence of thermal or mechanical stress due to large temperature changes which might lead to cracked packings
- exotherms requiring cooling coils inside column
Source:http://www.separationprocesses.com/Operations/POT_Chp02h.htm
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Why do open tubular columns provide greater resolution than packed columns in gas chromatography?
Open tubular columns provide greater resolution in gas chromatography because they have a larger surface area for interaction between the sample components and the stationary phase, leading to better separation. Additionally, the lower mass transfer resistance in open tubular columns allows for faster analysis times and improved peak shape, resulting in higher resolution.
How does liquid holdup effect the operation of a packed absorption column?
Liquid holdup in a packed absorption column can affect its operation by influencing the contact between the gas and liquid phases. Insufficient liquid holdup may result in poor gas-liquid mass transfer, leading to decreased absorption efficiency. Conversely, excessive liquid holdup can cause flooding and reduced gas flow, limiting the column's capacity and performance.
What carrier gas is used in packed columns of gas chromatography?
Nitrogen is usually used.
How does the particle size of a liquid a solid and a gas compare?
Particles in a gas have the smallest size and are the most spread out, particles in a liquid are larger than in a gas and are more closely packed, and particles in a solid are the largest and are tightly packed in a regular pattern.
What is the function of the packing in a packed tubular distillation?
The packing in a packed tubular distillation column provides a large surface area for vapor-liquid contact, allowing for efficient separation of components in the feed mixture. It helps to promote mass transfer between the vapor and liquid phases, enhancing separation efficiency and increasing the number of theoretical stages in the column.
Difference between tray and packed columns?
Packed column consist of porous substance as a packing in the column which provides contact between the fluids used,while different types of trays are used depending on the ease of separation instead of a packing in a usual tray column.
Do contact lenses count as a liquid according to TSA regulations?
Yes, contact lenses are considered a liquid by TSA regulations and should be packed according to the 3-1-1 rule for carry-on liquids.
Why do open tubular columns provide greater resolution than packed columns in gas chromatography?
Open tubular columns provide greater resolution in gas chromatography because they have a larger surface area for interaction between the sample components and the stationary phase, leading to better separation. Additionally, the lower mass transfer resistance in open tubular columns allows for faster analysis times and improved peak shape, resulting in higher resolution.
How does liquid holdup effect the operation of a packed absorption column?
Liquid holdup in a packed absorption column can affect its operation by influencing the contact between the gas and liquid phases. Insufficient liquid holdup may result in poor gas-liquid mass transfer, leading to decreased absorption efficiency. Conversely, excessive liquid holdup can cause flooding and reduced gas flow, limiting the column's capacity and performance.
What carrier gas is used in packed columns of gas chromatography?
Nitrogen is usually used.
How does the particle size of a liquid a solid and a gas compare?
Particles in a gas have the smallest size and are the most spread out, particles in a liquid are larger than in a gas and are more closely packed, and particles in a solid are the largest and are tightly packed in a regular pattern.
Are contact lenses considered a liquid when it comes to airline carry-on restrictions?
Yes, contact lenses are considered a liquid when it comes to airline carry-on restrictions. They must be packed in containers of 3.4 ounces or less and placed in a clear, quart-sized plastic bag when going through security.
What is the efficiency of packed columns in gas chromatography?
It is around 4000-6000 plates for a 2 meter column.
What are the columns used in hplc?
* large columns, specifically for packing. * analytical columns, for quantitative analysis, usually accompanied by a UV-vis detector. * Narrow bore columns, for more sensitive analysis * capillary columns, very this silica columns used almost exclusively with GC mass spectroscopy. * packed bed columns. with silica beads. and may have groups attached, e.g. C18.
What element are present in solid liquid and gas state?
in solids molecules are tightly packed in liquid molecules are not so tightly packed whereas in gas they are free to move
How atomes arranged in a liquid?
the atoms in a liquid are loosely packed together. they can move, but they have to move together.
How are atoms arrange in a liquid?
the atoms in a liquid are loosely packed together. they can move, but they have to move together.
