fractionating column การใช้

• Industrial fractionating columns use external reflux to achieve better separation of products.
• This is the rationale for a Vigreux column or a packed fractionating column.
• As the solution to be purified is heated, its vapors rise to the fractionating column.
• Another example of vapor and liquid contact devices are the spikes in laboratory Vigreux fractionating columns.
• Fractionating columns are widely used in the chemical process industries where large quantities of liquids have to be distilled.
• Figure 3 depicts an industrial fractionating column separating a feed stream into one distillate fraction and one bottoms fraction.
• Reflux stills incorporate a fractionating column, commonly created by filling copper vessels with glass beads to maximize available surface area.
• The liquid from the gas separator vessel is routed into a fractionating column commonly called a " stabilizer ".
• In practice when there are multiple distillate fractions, the distillate exit points are located at different heights on a fractionating column.
• Hence, a fractionating column almost always needs more actual, physical plates than the required number of theoretical vapor liquid equilibrium stages.
• The design and operation of a fractionating column depends on the composition of the feed and as well as the composition of the desired products.
• Reflux refers to the portion of the condensed overhead liquid product that returns to the upper part of the fractionating column as shown in Figure 3.
• This technique is frequently employed in chemical synthesis; in this case, the component of the still responsible for the separation is a fractionating column.
• Fractionating columns help to separate the mixture by helping the mixed vapors to cool, condense, and vaporize again in accordance with Raoult's law.
• In a typical fractional distillation, a liquid mixture is heated in the distilling flask, and the resulting vapor rises up the fractionating column ( see Figure 1 ).
• For a simpler definition a fraction is a part of the fractionating column where a compound with one boiling point can be separated from other compounds with different boiling points.
• However, many industrial fractionating columns have outlets at intervals up the column so that multiple products having different boiling ranges may be withdrawn from a column distilling a multi-component feed stream.
• Therefore, it has an initial boiling point of about 35 癈 and a final boiling point of about 200 癈 . Each cut produced in the fractionating columns has a different boiling range.
• In reality, each cycle at a given temperature does not occur at exactly the same position in the fractionating column; " theoretical plate " is thus a concept rather than an accurate description.
• This is the specialized capital required for mass production; each workbench and set of tools ( or each CNC cell, or each fractionating column ) is different ( fine-tuned to its task ).