What is called rectification section and distillation section .

A distillation method that uses reflux to separate liquid mixtures with high purity, is the most widely used liquid mixture separation operation in industry, and is widely used in petroleum, chemical, light industry, food, metallurgy and other sectors.

Distillation operations are classified according to different methods. According to the mode of operation, it can be divided into continuous distillation and batch distillation; According to the component fraction of the mixture, it can be divided into binary distillation and multivariate distillation; According to whether additives affecting the vapor-liquid balance are added to the mixture, it can be divided into ordinary distillation and special distillation (including extractive distillation, constant boiling distillation and salt distillation). If the distillation process is accompanied by a chemical reaction, it is called reactive distillation.

The separation of two-component mixtures is the simplest distillation operation. A typical distillation equipment is a continuous distillation unit, including a distillation tower, a reboiler, a condenser, etc. The distillation tower provides vapor-liquid two-phase contact for interphase mass transfer, the condenser located at the top of the tower makes the vapor partially condensed, part of the condensate returns to the top of the column as reflux liquid, and the rest of the distillate is the product of the top of the column.

The reboiler at the bottom of the column partially vaporizes the liquid, the vapor rises along the column, and the remaining liquid acts as the bottom product. The feed material is added to the middle of the tower, and the liquid in the feed material and the liquid from the upper tower section descend along the tower together, and the vapor in the feed material rises along the tower together with the vapor from the lower tower section.

In the entire distillation column, the vapor-liquid two phases are in countercurrent contact for interphase mass transfer. The volatile components in the liquid phase enter the vapor phase, and the non-volatile components in the vapor phase transfer to the liquid phase. For the system that does not form a constant boiling substance, as long as the design and operation are appropriate, the distillate will be a high-purity volatile component, and the bottom product will be a high-purity refractory volatile component.

In the tower section above the feed port, the volatile components in the rising vapor are further concentrated, which is called the distillation section;

The column below the feed inlet, where the volatile components are extracted from the descending liquid, is called the distillation section.

The combination of the two stages of operation allows the two components in the liquid mixture to be separated relatively completely, producing the two products of the required purity. When the n-component mixture is completely separated to obtain n high-purity one-component products, n-1 columns are required.

The reason why distillation can achieve a more complete separation of liquid mixtures lies in the application of reflux. The reflux includes the high-concentration volatile component liquid at the top of the column and the high-concentration refractory component vapor at the bottom of the column, both of which are returned to the column. The vapor-liquid reflux forms a vapor-liquid phase in countercurrent contact, resulting in a fairly pure one-component product at each end of the column.

The ratio of the amount of liquid flowing back into the column at the top of the column to the amount of product at the top of the column is called the reflux ratio, which is an important control parameter of the distillation operation, and its variation affects the separation effect and energy consumption of the distillation operation.

The recombinant component in the rising vapor phase above the feed plate is continuously condensed and separated, and the light component in the vapor phase is continuously purified, which is called the distillation section. The light components in the liquid phase under the feed plate are continuously vaporized and separated, and the recombinant components in the liquid phase are continuously concentrated, which is called the distillation section.

The difference between the rectification section and the distillation section is that the position is different, the product obtained is different, and the function is different.

1. The location is different.

The distillation section is the part above the feed port, from the feed tray to the top of the column, which is the rectification section of the distillation column.

The distillation section is the part below the feed inlet, starting from the feed tray and ending in the reactor.

2. The products obtained are different.

The distillation section is above the feed plate, towards the top of the column, the content of volatile components increases, and the product with high content of volatile components can be obtained at the top of the column.

The content of volatile components in the distillation section decreases, and the content of refractory volatile components becomes higher and higher, and products with high refractory volatile components can be obtained in the tower kettle.

3. The role is different.

The distillation section is a product (distillate) at the top of the column after the liquid at a certain temperature and pressure enters the distillation column, and the volatile light components are gradually concentrated in the distillation section to form the top of the column (distillate).

The distillation section is the part of the recombinant that is difficult to volatilize and gradually concentrates the branches one by one to generate the tower kettle product (residual liquid).

Start-up of the distillation column:

Start-up is a very important part of production, the goal is to shorten the start-up time, save costs, avoid possible accidents, and obtain qualified products as soon as possible.

General steps to drive a car:

Work out a reasonable driving routine, schedule, and necessary precautions. Prepare the necessary raw materials and water, electricity, steam**. Equip the staffing and complete the corresponding training.

At this time, the structure of the tower must meet the design requirements, the tower must be clean, no solid debris, no blockage, and remove all substances that should not be stored, such as the oxygen content and moisture content in the tower must meet the regulations. The pump and instrument are properly commissioned. Security measures have been adjusted.

Pressurize and depressurize the tower to reach normal operating pressure.

The tower is heated and cooled to bring it close to the operating temperature.

Add raw materials to the tower.

Open the heat source of the overhead condenser and open the reboiler and various heaters, and the cold source of various coolers.

The operating conditions and parameters of the tower are gradually adjusted, so that the load and product quality of the tower gradually reach the normal operation value as soon as possible, and transfer to normal operation. <>

The distillation column refers to the section above the charging plate (excluding the charging plate itself), and the distillation section refers to the section of the column below the charging plate (including the charging plate).

The function of the distillation section is to evaporate as much of the volatile components in the material as possible. The higher the vapor flows, the more volatile components are concentrated plate by plate. Because there are raw materials added to the feeding plate, the mass balance of the distillation section is different from the distillation section below, so the analysis of the distillation column is generally divided into the above two sections.

The function of this section of the distillation section is to put forward the volatile components in the material as much as possible, so that the more the liquid flows, the more volatile components in it, the more concentrated the volatile components are gradually increased.

Generally, the layer of the raw liquid into the plate is called the feeding plate, and the tower section above the feeding plate is used to further concentrate the volatile components in the rising vapor, which is called the distillation section; The column section below the charging plate (including the charging plate), whose function is to extract the volatile components from the descending liquid, is called the distillation section.

Summary. The difference between the distillation section and the distillation section is that distillation is generally used to separate homogeneous liquid mixtures, and these two components must meet the distillation conditions, that is, they have different volatility. There are many trays in the distillation column, one of which is used to feed the material, which may be located anywhere in the rectification column, depending on the composition of the feed, thermal conditions, etc., above this feeding plate, towards the top of the column, the content of volatile components increases until it reaches the composition specified by the working conditions.

The section from the feed tray to the top of the column is the rectification section of the rectification column. Then starting from the feed tray to the tower kettle, it is the distillation section of the rectification column. The content of volatile components in the rectification section is increased, and the content of volatile components in the distillation section is reduced, and a product with a high content of volatile components can be obtained at the top of the column.

The content of refractory volatile components in the distillation stage is getting higher and higher, and products with high refractory volatile components can be obtained in the tower kettle.

The difference between the distillation section and the rectification section of the rectification column.

The difference between the distillation section and the distillation section is that distillation is generally used to separate homogeneous liquid mixtures, and these two components must meet the distillation conditions, that is, they have different volatility. There are many trays in the distillation column, one of which is used to feed the material, which may be located anywhere in the rectification column, depending on the composition of the feed, thermal conditions, etc., above this feeding plate, towards the top of the column, the content of volatile components increases until it reaches the composition specified by the working conditions. The section from the feed tray to the top of the column is the rectification section of the rectification column.

Then starting from the feed tray to the tower kettle, it is the distillation section of the rectification column. The content of volatile components in the rectification section is increased, and the content of volatile components in the distillation section is reduced, and a product with a high content of volatile components can be obtained at the top of the column. The content of refractory volatile components in the distillation stage is getting higher and higher, and products with high refractory volatile components can be obtained in the tower kettle.

The difference is that distillation is generally used to separate homogeneous liquid mixtures, and these two components must meet the distillation conditions, that is, they have different volatility.

The role of the rectification section of the rectification column.

The role of the rectification column is lifted.

The action of the distillation section of the distillation column is to concentrate the concentration of volatile components in the gas phase plate by plate.

The function is to increase the concentration of light components in the incoming tower material

Summary. 1.Increase the feed temperature:

Increase the feed flow: Increasing the feed flow rate can increase the rate of fraction generation, which in turn increases the content of the distillation section. However, care needs to be taken not to exceed the processing capacity of the equipment design.

3.Adjust the reflux ratio: The reflux ratio refers to the proportion of a portion of the liquid that is returned to the top of the tower to keep the temperature in the tower stable.

Proper adjustment of the reflux ratio can change the concentration distribution of the liquid phase in the column, thereby affecting the content of the distillation section. 4.Change the state of the tray:

Adjusting the state of the tray (e.g., turning the tray on or off) can change the distribution of the gas and liquid phases in the column, affecting the separation of fractions, thereby increasing the content of the distillation section. 5.Optimized operating parameters:

According to the actual situation, the operating parameters can be optimized and adjusted, such as reducing the condenser load and adjusting the temperature of the reboiler, which can affect the content of the distillation section.

The methods for increasing the content of the distillation section are mainly as follows:

However, care needs to be taken not to exceed the temperature range of the device. 2.Increase the flow rate of jujube spine material:

Increasing the feed flow rate increases the rate of fraction generation, which increases the content of the distillation section. However, care needs to be taken not to exceed the processing capacity of the equipment design. 3.

Adjust the reflux ratio: The reflux ratio refers to the proportion of a portion of the liquid that is returned to the top of the tower to keep the temperature in the tower stable. Proper adjustment of the reflux ratio can change the concentration distribution of the liquid phase in the column by stool infiltration, which can affect the content of the distillation section.

4.Change the state of the tray: Adjusting the state of the tray (such as turning the tray on or off) can change the distribution of the gas phase and the liquid phase in the column, which will affect the separation effect of the fractions, so as to increase the content of the distillation section.

5.Optimize the operating parameters: According to the actual situation, the operating parameters can be optimized and adjusted, such as reducing the load of the condenser and adjusting the temperature of the reboiler, which can affect the content of the distillation section.

When carrying out the above operations, it is necessary to consider the safety and stability of the equipment, and strictly abide by the operating procedures and standards.

Is there another way?

That's all I've collected so far, dear.

This is the packed tower.

Dear, I don't really understand what you mean, can you be more detailed?

How to improve the separation effect of the distillation section?

There are several ways to improve the separation effect of the distillation section:1Increase the number of trays:

Increasing the number of plates can increase the efficiency of the distillation column. Because on each plate, the liquid and the gas are exchanged and thus separated. 2.

Controlled feed flow: Controlling the feed flow rate can be used to keep the liquid level in the distillation column stable, thus improving the separation efficiency. 3.

Adjust the reflux ratio: The reflux ratio refers to the ratio of the liquid to the top of the tower to the total amount of feed. Proper adjustment of the reflux ratio can keep the temperature and pressure in the distillation column stable, thereby increasing the separation efficiency.

4.Optimization of operating conditions: If the operating conditions such as feed temperature and pressure are properly adjusted, the volatility difference of the material can be improved, so that the separation efficiency of the liquid branch can be improved.

5.Use auxiliary equipment: The use of auxiliary equipment such as condensers and heaters can better control temperature and pressure changes, thereby improving separation efficiency.

Summary. Dear dear, it's a pleasure to answer your <>

The design of the fractionation column or plate can affect the separation results, and the use of more efficient fractionation columns or plates can improve the separation efficiency and thus increase the content of the distillation section. 2.Adjust fractionation conditions:

How to increase the content of the distillation section.

Dear dear, it's a pleasure to answer your <>

The design of the fractionation column or plate can affect the separation effect, and the use of more efficient fractionation columns or plates can improve the separation efficiency, and the coarse opening can increase the content of the distillation section. Envy 2Adjust fractionation conditions:

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Methods to improve the content of the cavity segment of distillation, 3Changing the composition of the raw material: Choosing a raw material with a higher boiling point can increase the content of the distillation section.

4.Optimize the operating conditions: The operating conditions such as the reflux ratio, the flow rate at the top and bottom of the column, and the temperature at the top of the column can be adjusted through the permeability difference to optimize the production process, so as to increase the content of the distillation section.

5.The compatibilizer Chunpi is used: the compatibilizer can be dissolved with the raw material components during the distillation process, thereby increasing the content of the distillation section.

6.Add additives: Some additives can lower the boiling point of some compounds, making it easier for them to enter the distillation section and increase the content of the distillation section.

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