HETP height equivalent of a theoretical

FP = flow parameter, dimensionless HETP = height equivalent of a theoretical plate, in. 

Distillation stage calculations are usually performed with ideal stages, The number of ideal stages required for the separation is divided by the overall column efficiency (Sec, 7,1,1) to obtain the required number of trays. In packed towers, the number of stages in the column is multiplied by the HETP (Height Equivalent of a Theoretical Plate, see Sec. 9.1,2) to obtain the packed height. 

The concept of HETP (height equivalent of a theoretical plate) was introduced to enable comparison of efficiency between packed and plate columns. HETP iB defined as... 

Liquid maldistribution tends to lower packing turndown (221, 386, 387). The "standard distributor curve in Fig. 3.1 depicts typical variation of packing HETP (height equivalent of a theoretical... 

Figure 2 A van Deemter plot of plate height (plate height = HETP = height equivalent of a theoretical plate) vs. linear velocity showing that SFC exhibits similar, low (good) plate heights but at much higher velocities (and flow rates) compared to HPLC. Lines A, B, and C represent efficiency vs. flow on 10, 5, and 3 pm particles, respectively. Lines D and E represent HPLC on 10 and 3 pm particles, respectively.

EPR electron paramagnetic resonance HETP height equivalent of (a) theoretical plate(s)... 

Many operating variables, such as sample volume, flow rate, column length, and temperature, must be considered when performing any separation. The relative importance of these variables for Toyopearl HW-55F resin columns has been specifically evaluated. For example. Fig. 4.47 shows the relationship between column efficiency, or height equivalent of a theoretical plate (HETP),... 

HETP = height equivalent to a theoretical plate, ft HTU = height of a transfer unit, ft L = liquid mass velocity, Ib/hr-ft m = exponent a 1.0 n = exponent 0.44 Pr = Prandtl number, dimensionless Sc = Schmidt number dimensionless U, = linear velocity of gas based on total column cross-sectional area, ft/sec... 

HETP = height equivalent to a theoretical plate, inches Hog = height of an overall gas phase transfer unit, inches... 

As with distillation, the correlation for overall tray efficiency for absorbers, given in Equation 10.7, should only be used to derive a first estimate of the actual number of trays. More elaborate and reliable methods are available, but these require much more information on tray type and geometry and physical properties. If the column is to be packed, then the height of the packing is determined from Equation 9.64. As with distillation, the height equivalent of a theoretical plate (HETP) can vary... 

HETP = height equivalent to a theoretical plate. It is derived from the plate theory of distillation which is a confusing concept having no basis in fact in the context of modem chromatographic separations. Nevertheless the terms plate number and plate height are still very widely used. 

I. Height Equivalent of a Theoretical Plate or Plate Height (HETP or H)... 

HETP, height equivalent to a theoretical plate The length of a chromatography column divided by the number of theoretical plates in the column. 

HETP Height equivalent to a theoretical plate. A measure of the combined effects of axial mixing and finite mass transfer resistance in causing deviations from ideal (equilibrium) behavior in a chromatographic column or in a countercurrent contact system. The definitions of HETP in these two cases are somewhat different,... 

From the number of plates in the column, the height equivalent of a theoretical plate (HETP), usually abbreviated to plate height (H), can easily be calculated ... 

HETP (Height equivalent to a theoretical plate). A measure of band spreading which compensates for the effect of column length. 

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