packed bed

(redirected from Packed column)

packed bed

[′pakt ′bed]
(chemical engineering)
A fixed layer of small particles or objects arranged in a vessel to promote intimate contact between gases, vapors, liquids, solids, or various combinations thereof; used in catalysis, ion exchange, sand filtration, distillation, absorption, and mixing.
References in periodicals archive ?
5-7 at Makuhari Messe, Japan, introducing the 'IC SI-36 4D', as well as demonstrating the 'OHpakTM LB-804', a new grade of OHpak column for GFC, using a hydrophilic polymer base, and SEC, using aqueous solvents, and the 'PROTEIN LW-403 4D', a silicate packed column for GFC, which realizes quick analysis.
A sample is dissolved in solvent and forced through a tightly packed column at high pressure to enable separations with high resolution.
However, the operation requires higher pressure in pumping the liquid through the packed column. The column pressure attained was from 6,000 to 7,000 psi, which is below the maximum allowable column pressure (10,000 psi).
Hydralazine has been determined by GC after derivatization with nitrous acid [18] or with acetyl acetone [19, 20] using packed column. Ethyl chloroformate (ECF) reacts amino compounds (primary and secondary) to form carbamates derivatives [21] in aqueous -organic phase.
Creation of this buffer gradient on the packed column showed the impact of buffer pH and conductivity simultaneously on the two proteins to be separated.
The fan discharges into the distribution chamber and the air passes wet and dry bulb thermocouples before it enters the packed column. As the air stream flows through the packings, its moisture content increases and the water is cooled.
West, "The many faces of packed column supercritical fluid chromatography--a critical review," Journal of Chromatography A, vol.
The Precht method was the EU's official analysis method for the recognition of foreign fats and is based on the GC separation of triglycerides on a packed column, which does not separate individual triglyceride peaks but rather peaks corresponding to triglyceride families [2, 3].
Yield immobilization of Con A in PVA-GA was estimated at 30%, when the protein is circulated in the previous packed column. When Con A was immobilized under stirring with PVA-GA, yield immobilization decreased to approximately 18%.
If that isn't enough for one jam packed column on Friday I witnessed Kingsley Chapman and the Murder serve up a sensational set at the 10th birthday party for the wonderful NARC magazine.
The first coupling of SFE to SFC with a capillary column was by Hawthorne [7] and Wright [8] in 1987, while McNally[9] and Engelhardt[10] reported the coupling with a packed column in 1988.