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# Gravity Distillation equipment manufacturers rectifying section describes the material balance

###### Author:Zhejiang Chemical Equipment Co., Ltd. Chong Hing Source:http://www.zjcxce.com posted on:2015-08-28 10:23:53

Gravity Distillation equipment manufacturers rectifying section describes the material balance

In the analysis of the operation of the distillation column, it is often required to master the tower adjacent to the quantitative relationship between gas, liquid concentration between the two plates between, this relationship is called the operating line relationship, the equation expressing this relationship called operating line equation. Performed by the rectifying section can be drawn from the material balance equation rectifying section operating line for the stripping section can be drawn from the material balance equation distillate mention operating line segment.

(A) the assumption of constant molar flow

To simplify the calculations, the introduction of gas, the basic assumption of constant molar flow was as follows.

(1) Constant molar vaporization? In the distillation process, each plate rectifying section within the steam rising molar flow equal to y represent. So also within the stripping section to mine expressed. However, two of the ascending vapor molar flow are not necessarily equal.

(2) constant molar overflow? In the distillation process, each plate fall within the rectifying section of the liquid molar flow rate equal to L represent. So also within the stripping section, with L, Fig. But two of the liquid molar flow not necessarily equal.

Gravity Distillation equipment manufacturers rectifying section describes the material balance

In the analysis of the operation of the distillation column, it is often required to master the tower adjacent to the quantitative relationship between gas, liquid concentration between the two plates between, this relationship is called the operating line relationship, the equation expressing this relationship called operating line equation. Performed by the rectifying section can be drawn from the material balance equation rectifying section operating line for the stripping section can be drawn from the material balance equation distillate mention operating line segment.
(A) the assumption of constant molar flow
To simplify the calculations, the introduction of gas, the basic assumption of constant molar flow was as follows.
(1) Constant molar vaporization? In the distillation process, each plate rectifying section within the steam rising molar flow equal to y represent. So also within the stripping section to mine expressed. However, two of the ascending vapor molar flow are not necessarily equal.
(2) constant molar overflow? In the distillation process, each plate fall within the rectifying section of the liquid molar flow rate equal to L represent. So also within the stripping section, with L, Fig. But two of the liquid molar flow not necessarily equal.
If the plates when the gas-liquid two-phase in contact with 1km. Steam condensate 1, there is a corresponding 1km. Vaporization of the liquid 1, assuming a constant molar flow that is established. To do so, you must meet the following conditions: ① each component equal molar latent heat; ② When the gas-liquid two-phase contact with sensible heat due to the temperature difference in the exchange can be ignored; ③ fractionator good insulation, heat loss can be ignored.
When distillation operation, though it is a constant molar flow hypothesis, but a lot of things system, especially with similar structure and properties of matter based component constituted basically in line with the conditions described above, the object of this chapter the research process can be assumed by accord .
(B) rectifying section operating line equation
Rectifying section operating line equation by the dashed line range (including rectification paragraph i + 1 shelf on the tower section and condenser) 10-3 as shown in the material balance.

Figure 10-3 on the subject under the provisions of the following concentrations: a tray from which you use the tray number as subscript, from top to bottom plate number from the No. 1 starting sequence number. Concentration begin mole fraction representation.
So that R = L / D, and referred to as the reflux ratio is the amount of overhead reflux ratio and the amount of overhead product, which is very important distillation operation operating parameters. Which will be discussed later.
In the above formula, since the i plate is optional, as long as the part that is able to meet the rectifying section. It can be removed under the standard, too
Formula (10-6) and (10-9) are called the rectifying section operating line equation, which is meant to signify that under certain operating conditions within rectifying section between any two adjacent plates, from a tower the relationship between the composition of the liquid vapor composition board decline and rise from a tray. Wherein the formula (10-9) used more common.
Obviously, the rectifying section operating line equation in ~ z - y rectangular coordinates on the graph is a straight line in FIG. Its practices are as follows: to operate two special points for connection lines operate draw the line. In the formula (10-9), the order X = XD. It can be regarded as Y = XD. , Thus indicating that the point d (XD, XD) is a special point rectifying section operating line at that point may be on the diagonal YX diagram by X = XD. Easy to mark, another special point 6 obtained by the intercept operation line equation, namely point (0, XD / R + 1). Figure 10-4 shows that the method by these two special points rectifying section operation even make straight lines.
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