Rectifying tower flow controllable type lateral-line extraction combined device

A combined device and rectification tower technology, which is applied in the field of column separation in the field of mass transfer and heat transfer, can solve the problems of difficult flow measurement and control, and achieve the effect of avoiding evaporation and purification, compact structure of the device, and easy operation

Inactive Publication Date: 2011-06-01
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a flow-controllable side line discharge combination device, which solves the difficulty of measuring and controlling the flow rate when the gas phase side line is extracted in the rectification tower, and at the same time, the partial condensation of the gas phase is equivalent to adding a layer of theory Tray

Method used

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  • Rectifying tower flow controllable type lateral-line extraction combined device
  • Rectifying tower flow controllable type lateral-line extraction combined device
  • Rectifying tower flow controllable type lateral-line extraction combined device

Examples

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Embodiment 1

[0032] Example 1: A rectification tower for separating organosilicon monomers A and D in a factory, the original tower is 3 towers in series, the tower diameter is 3m, each tower has 100 theoretical plates, and the liquid phase at the top of the 3# tower is 99.99% % of dimethylformamide, 99.95% of dimethylformamide (containing 0.04~0.05% of high-boiling mixture whose boiling point is 30~100°C higher than that of dimethylformamide) was extracted from the liquid phase of the 1# column, and now the 1# tower The first technical transformation of the tower kettle is planned to adopt gas phase extraction. After the transformation, it was found that the dimethylformamide content increased to 99.97~99.99%, but the operation control was unstable, the production volume fluctuated, the heat load of the tower kettle increased sharply, and the tower pressure drop increased. Then adopt the device of the present invention to carry out secondary transformation as follows: pull down one deck t...

Embodiment 2

[0033] Implementation example 2: A rectification tower for separating monochloromethane and dichloromethane in a factory, with a diameter of 1.4m, structured packing is used, and the stripping section is composed of 4 sections of packing, wherein methylene chloride is composed of two layers of packing near the bottom of the tower. The side line of the liquid phase collector in between is extracted. Since the material contains a small amount of water and heavy components such as polychloroethane, the concentration of the side product is 99.92~99.95%. Now use the flow controllable side line discharge combination device of the present invention to carry out transformation, specifically: the position of the original liquid collector 2 remains unchanged, and a plug-in U-shaped condenser 3 and a condensate collection tank 4 are added below, and the plug-in U-shaped Condenser 3 has a diameter of 0.4m. It is a double-tube plug-in U-shaped condenser 3 composed of a group of 30 heat exc...

Embodiment 3

[0034]Implementation example 3: A certain factory produces hydroxyquinoline products, and its boiling point is as high as 300 ° C, so precision rectification of high-efficiency packing must be carried out under high vacuum. Because hydroxyquinoline will partially polymerize at about 220°C to produce high boiling substances (about 80°C difference from the boiling point of the product), and even if the vacuum degree of the rectifying tower is as high as 3mmHg, the theoretical temperature of the tower still must reach 225°C, so the high boiling point By-products cannot be avoided. The original device is equipped with a liquid phase and a gas phase extraction outlet between the two layers of packing near the tower kettle. When the liquid phase extraction is operated, the operation is stable but the product purity is only 92~95; when the gas phase is extracted, the product purity is higher. , reaching 95~98%, but the operation is not easy to control, the degree of vacuum varies gre...

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Abstract

The invention relates to a rectifying tower flow controllable type lateral-line extraction combined device, which is mainly used for the precisely controlled extraction process of gas phase lateral-line products in the rectifying tower. The rectifying tower flow controllable type lateral-line extraction combined device comprises a liquid collecting device, an inserted type condenser, a condensate collecting groove and a demister, wherein the principle of the device is as follows: the liquid and gas are reasonably divided, the phenomenon that the rising gas phase contains the liquid is avoided, and then the rising gas phase is partially condensed into liquid phase by the inner inserted type heat exchange device and is partially laterally extracted. By using the device, the difficulties that the flow is difficult to measure and control when the gas phase lateral-line extraction is performed in the rectifying tower are overcome, and at the same time, the gas phase partially condensation is equivalent to adding a layer of theoretical plate. The device has compact structure, is suitable for the rectifying tower which requires laterally extracting high-purity products in stripping section, and is in particular suitable for the separation process for high vacuum heat-sensitive materials.

Description

technical field [0001] The invention relates to a tower separation technology in the field of mass transfer and heat transfer, in particular, it is a related tower internal part extracted from the side line of a separation tower. Background technique [0002] In large chemical processes, such as oil refining, petrochemical, fertilizer, fine chemical, environmental protection, marine chemical, metallurgy and other industries, plate or packed towers are widely used as units for distillation, absorption, desorption, degassing, concentration, washing and heat transfer main equipment for operation. In the column, the tray and packing are the core components of the column, and the matching gas distributor, liquid distributor, liquid collector, gas-liquid extraction device, demister device, support structure, etc. Complementary column internals systems. With the continuous development and practice of column technology, it is found that the performance of column internals determin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/32
Inventor 耿皎秦松彭璟马少玲
Owner NANJING UNIV
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