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A falling film devolatilization tower internal component

A technology of devolatilization tower and internal components, applied in the field of internal components of falling film devolatilization tower with high specific surface area, can solve the problems of affecting devolatilization effect, uncontrollable residence time, non-renewable interface, etc., to improve gas-liquid mass transfer The effect of efficiency

Active Publication Date: 2016-05-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In-tube falling film or flowing liquid column (drop) type devolatilizer can provide a considerable gas-liquid interface, but the interface is basically not updated, and the residence time is uncontrollable, which may affect the devolatilization effect due to insufficient time
The horizontal devolatilizer equipped with single-shaft or double-shaft multi-disc (network) stirring can effectively update the interface to a certain extent and can adjust the liquid level to control the residence time, but the structure is too complicated, and the manufacturing and operating costs are high.
In order to ensure the film formation rate, there must be sufficient depth of liquid layer at the bottom of this type of devolatilizer, and the static pressure head has a negative impact on the devolatilization effect

Method used

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  • A falling film devolatilization tower internal component
  • A falling film devolatilization tower internal component
  • A falling film devolatilization tower internal component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: polyacrylonitrile devolatilization tower

[0041] The diameter of the devolatilization tower is 1000mm, the height is 7500mm, the single baffle is 930mmX800mmX2mm, 8 baffles are set, and rectangular holes are opened. 92%. When the descending liquid flows to the opening, a film is formed, and the ascending gas contacts and mass transfers on the film. The liquid film flows through the opening, and due to the drainage effect of the serrated edge, the liquid film can flow smoothly to the next baffle.

[0042] The polyacrylonitrile solution containing 2.5% acrylonitrile monomer enters the tower, the temperature is 140°C, the flow rate is 6000kg / h, the pressure inside the tower is 0.5MPa, and the acrylonitrile monomer in the polyacrylonitrile solution can be removed from the tower. The mass transfer efficiency of internal components adopted in this patent is 20% higher than that of traditional technology.

Embodiment 2

[0043] Embodiment 2: polystyrene devolatilization tower

[0044] The length of the devolatilization tower is 900mm, the height is 6000mm, the single baffle is 800mmX600mmX2mm, 7 baffles are set, trapezoidal holes are opened perpendicular to the direction of the baffles, and the opening rate is 86%. The polystyrene solution containing 5% styrene monomer enters the tower, the temperature is 232°C, the flow rate is 5000kg / h, the pressure inside the tower is 1.0MPa, and the content of styrene monomer in the polystyrene solution exiting the tower is 0.05%. The mass transfer efficiency of internal components adopted in this patent is 18% higher than that of traditional technology.

Embodiment 3

[0045] Embodiment 3: polyvinyl acetate solution removes toluene

[0046] The devolatilization tower has a diameter of 1000mm and a height of 8000mm. A single baffle is 800mmX800mmX2mm. There are 9 baffles, and triangular holes are opened perpendicular to the direction of the baffles. The opening rate is 80%. The polystyrene solution containing 30% styrene monomer enters the tower, the temperature is 335°C, the flow rate is 5000kg / h, the pressure inside the tower is 0.5MPa, and the styrene monomer in the polystyrene solution can be completely removed from the tower. The mass transfer efficiency of internal components adopted in this patent is 15% higher than that of traditional technology.

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Abstract

The invention relates to an internal component of a falling film de-volatilization tower. The internal component is composed of a plurality of baffle plates. The baffle plates are square, rectangular or trapezoid; holes with equal distances are opened in the middle parts of the baffle plates; one end of each baffle plate is in a saw tooth shape; the two baffle plates are connected at an angle of 1-150 degrees; the distance between a connection part and the tops of the baffle plates is 5mm-20mm. Rectangular holes with equal distances are opened in the middle parts of the baffle plates; the transverse distance between the geometric centers of the holes is 10mm-200mm; the distance between the top of each hole to the top of the corresponding baffle plate is 15mm-200mm; the distance between the lower end of each hole to the saw tooth tip of the corresponding baffle plate is 15mm-200mm. The special design provided by the invention guarantees that a falling film liquid surface is updated sufficiently and a great de-volatilization interface is generated. The internal component of the falling film de-volatilization tower is simple in structure, high in de-volatilization efficiency, great in operation elasticity, low in manufacturing cost and simple in machining, and can be widely applied to various chemical de-volatilization operation units.

Description

technical field [0001] The invention relates to an internal component of a gravity falling film devolatilization tower (device), in particular to an internal component of a falling film devolatilization tower with a high specific surface area whose membrane surface is constantly renewed. Background technique [0002] Devolatilization is an important link in chemical production, and its task is to transfer volatile substances from liquid phase to gas phase. The main ways to improve devolatilization efficiency include: [0003] 1. Increase the temperature of the devolatilization system; [0004] 2. Reduce the partial pressure of volatile components in the gas phase; [0005] 3. Increase the air-liquid interface; [0006] 4. Update the interface in time. [0007] The temperature of the devolatilization system is subject to the permission of the process conditions, and the gas phase partial pressure of the volatile components can be reduced by adopting [0008] inert [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/00B01D1/22B01D3/00
Inventor 刘春江刘晨王冠琦黄哲庆袁希钢
Owner TIANJIN UNIV
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