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Scrubbing tower for gas containing sublimable substances

A gas washing and material technology, applied in gas treatment, dispersed particle separation, membrane technology, etc., can solve the problems of device explosion, affecting normal operation, channel blockage, etc., and achieve the effect of low cost, easy operation, and simple structure

Active Publication Date: 2017-01-04
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual industrial production, for sublimable substances, due to their physical and chemical characteristics of sublimation when heated and solidified when cooled, it often causes equipment bodies (reactors, towers, heat exchangers, storage tanks, etc.), pipelines, Valves, instruments and other passages in contact with the material are severely blocked, which will affect the normal operation of the light case, and cause accidents such as device explosion or fire in the severe case, causing serious consequences
[0003] For this problem, there is no mature and finalized technical method in the industry to solve it.

Method used

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  • Scrubbing tower for gas containing sublimable substances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 In the washing tower shown, the height of the buffer chamber is 1500mm, the height of the washing chamber is 2000mm, and the diameter is 1000mm. Use it to wash the raw material liquid of p-dichlorobenzene containing sublimable gas, so as to prevent the sublimated p-dichlorobenzene from damaging subsequent equipment. The pressure inside the tower is 0.005MPa, the temperature is 70°C, and the defoaming net adopts a multi-layer wire mesh structure.

[0017] The composition of the raw material liquid in the material storage tank 1 is that p-dichlorobenzene accounts for 10%, NMP accounts for 20%, inorganic salt accounts for 30%, and water accounts for 50%. Since p-dichlorobenzene is easy to sublimate, there is a gas phase of p-dichlorobenzene above the material storage tank 1, wherein the gas-liquid ratio in the storage tank is 1:5. There are three streams of gas-phase materials entering the lower washing chamber of the washing tower 2: the first stream, t...

Embodiment 2

[0021] Similar to the operation method of Example 1, but the height of the buffer chamber at this time is 2000mm, the height of the washing chamber is 3500mm, the diameter is 900mm, the pressure in the tower is 0.095MPa, and the temperature is 60°C. The washing chamber contains sublimable paradichloro The linear velocity of benzene gas is 1m / s. After carrying out the same time, it is recorded that the composition of the liquid entering the next section is 12% for p-dichlorobenzene, 18% for NMP, 25% for inorganic salts, 45% for water, and the gas-liquid ratio is 1: 35.

Embodiment 3

[0023] Similar to the operation method of Example 1, but the height of the buffer chamber at this time is 2500mm, the height of the washing chamber is 5000mm, the diameter is 900mm, the pressure in the tower is 0.075MPa, and the temperature is 40°C. The washing chamber contains sublimable paradichloro The linear velocity of benzene gas is 1.5m / s. After carrying out the same time, it is recorded that the composition of entering the liquid in the next section is that p-dichlorobenzene accounts for 13%, NMP accounts for 17%, inorganic salt accounts for 24%, water accounts for 46%, and the gas-liquid ratio is 1: 38.

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PUM

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Abstract

The invention discloses a scrubbing tower for gas containing sublimable substances. The scrubbing tower is composed of an upper part and a lower part, the upper part is a scrubbing liquid buffering chamber, and the lower part is a scrubbing liquid separating chamber. The upper part and the lower part are separated through a partition plate. Three pipe orifices are formed in the upper part, the scrubbing liquid inlet is formed in the middle, U-type pipe connector is formed in the bottom, an upper connector of a balance pipe is formed in the top of the tower, by means of the balance pipe, gas (liquid foam with flashing) of the upper part is introduced to the lower part to be separated, and pressure balance between the upper part and the lower part of the seal tower is kept. A sublimable substance scrubbing and separating chamber is formed in the lower part and sequentially comprises an in-tower connector for the gas containing the sublimable substances, an in-tower connector for gas phase in a scrubbing liquid storage tank, a lower connector for the balance pipe, a filler layer for enabling the gas and liquid to make tight contact for mass transfer and scrubbing, a lower U-type pipe connector, a foam removal net and a purified gas outlet pipeline from bottom to top. The scrubbing tower is simple in structure and ingenious in concept and has the good functions of resisting gas phase liquid foam entrainment and resisting blocking by the sublimable substances.

Description

technical field [0001] The invention relates to a scrubber for gases containing sublimable substances. Background technique [0002] In the production process of modern chemical industry, medicine, new materials, etc., we often encounter sublimable chemical substances, such as camphor, borneol, p-dichlorobenzene, benzoic acid and other gases. These substances have a special difference from other common The physical and chemical properties of chemical materials - sublimation, that is to say, at an appropriate temperature, they will directly sublimate from solid to gaseous state without passing through liquid state, and once they encounter a lower temperature, they will quickly freeze directly from gaseous state to solid state. Ordinary chemical substances generally change from solid to liquid when they are heated, and then turn into gas when heated; and if they are continuously cooled, they first change from gas to liquid, and then turn into solid. In actual industrial prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18
CPCB01D53/1487B01D53/18B01D2257/2064
Inventor 张志炳周政巫先坤王宝荣罗宋孟为民杨高东
Owner NANJING UNIV