Falling film blow-off device with flash function

A falling film, functional technology, applied in flash evaporation, distillation separation, distillation adjustment/control, etc., can solve the problem of temperature rise of feed liquid, and achieve the effect of energy saving, simple design and reasonable structure in the treatment process

Active Publication Date: 2019-10-25
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration of halogenated hydrocarbons in the saponification raffinate can be reduced to about 200mg / L by air stripping, but this process requires the introduction of water vapor, which will consume a certain amount of energy, and the temperature of the feed liquid will also increase during this process

Method used

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  • Falling film blow-off device with flash function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] combine figure 1 As shown, a falling film blow-off device with a flash function in this embodiment. It includes a flash chamber 1, a falling film stripping tower 2, a stripping chamber 3 and a constant pressure cold well 4.

[0033] The saponification raffinate of vinylidene chloride containing 1836mg / L of halogenated hydrocarbons and a temperature of 65°C enters the flash chamber 1 through atomization from the feed port 9 of the flash chamber 1 for flash evaporation, and the gas phase outlet 7 is connected to a vacuum condensing system and finally to the exhaust gas disposal system.

[0034] After flash evaporation, the concentration of halogenated hydrocarbons in the feed liquid drops to 1020mg / L, and the temperature is 45°C. It enters the falling film stripping tower 2 by gravity through the U-shaped transfer pipe 6, and contacts with the stripping air entering from the lower part, and the halogenated hydrocarbons further transfer to the gas phase;

[0035] The st...

Embodiment 2

[0037] The present embodiment processing process is the same as embodiment 1, wherein difference is that the vacuum degree of flash chamber 1, the water seal temperature of constant pressure cold well 4 and the thickness values ​​of defoaming wire mesh 8 are different, but they can all be equal To achieve the same effect as in the specific embodiment, Table 1 shows the values ​​and results of the parameters in each embodiment in this embodiment.

[0038] Parameter value and result in the embodiment 2 of table 1

[0039] index Example 2-1 Example 2-2 Example 2-3 Example 2-4 Flash vacuum (MPa) 0.05 0.01 0.01 0.022 Cold well temperature (℃) 30 10 0 30 Feed halogenated hydrocarbon concentration mg / L 1990 1990 1860 1860 Thickness of defoaming screen 8 (mm) 500 100 100 300 Output halogenated hydrocarbon concentration mg / L 201 158 155 192

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Abstract

The invention provides a falling-film air stripping device with a flash evaporation function and belongs to the field of devices for chemical clean production. The falling-film air stripping device comprises a flash chamber and a falling-film air stripping tower, and also comprises a gas stripping chamber. The falling-film air stripping device is successively provided with the flash chamber, the falling-film air stripping tower and the gas stripping chamber from top to bottom. A feed inlet is arranged at the side face of the flash chamber. The bottom of the gas stripping chamber is provided with a feed liquid outlet. One end of a U-shaped material transfer tube is communicated with the flash chamber, the other end of which is communicated with the falling-film air stripping tower. A gas phase outlet is positioned at the top of the flash chamber. The falling-film air stripping tower is communicated with a feed liquid receiving tank. Gas which goes out of the falling-film air stripping tower enters a vacuum condensation system. By integrating flash evaporation and falling-film air stripping into one equipment, the device is used for removing halogenated hydrocarbon from saponification raffinate of vinylidene chloride without external heat energy, and the saponification raffinate also can be cooled. In addition, gas quantity in the air stripping process is low.

Description

technical field [0001] The invention belongs to the field of chemical cleaning production devices, and more specifically relates to a falling film blowing device with a flash function. Background technique [0002] For the separation of halogenated hydrocarbons in the water phase, the common method is to raise the temperature of the feed liquid and strip it with water vapor. This process utilizes the volatility of halogenated hydrocarbons. When the steam passes through the feed liquid, the concentration of halogenated hydrocarbons in the gas phase The concentration is greater than that in the liquid phase, and the halogenated hydrocarbons are generally transferred from the water phase to the gas phase through the flow of the gas or transferred from the water phase to the gas phase by using its own volatility. [0003] The production of vinylidene chloride is usually prepared by the saponification reaction of 1,1,2-trichloroethane and sodium hydroxide, and the saponified raff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/06B01D3/34B01D3/42
CPCB01D3/06B01D3/343B01D3/42
Inventor 林原赵昕王文娟张炜铭张建春吕路
Owner NANJING UNIV
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