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Phosgene absorbing tower

An absorption tower and phosgene technology, applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of difficulty in operation and maintenance, stuck float valve, and large pressure drop on the tray. Small liquid holdup, reduced channel wall flow, and low cost

Inactive Publication Date: 2009-07-15
YANTAI JULI ISOCYANIC ESTER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Phosgene is an important organic intermediate, which is a highly toxic gas. At present, the absorption of phosgene is mainly carried out by absorption operation. At present, the absorption towers widely used at home and abroad are floating valve towers. Due to the skilled technology of floating valve towers And ideal absorption effect, it is recognized as the first choice of phosgene absorption tower. The existing floating valve tower has a circular valve hole on the tray, and a valve plate that can float up and down in an appropriate range is installed in the hole. When working, the gas rises from the valve hole, opens the valve plate, passes through the annular gap, and then blows into the liquid layer in the horizontal direction to form foam to achieve the purpose of absorption, but the floating valve tower has the following disadvantages: 1) When the gas velocity is low , there is still liquid leakage from the tray, resulting in a decline in the efficiency of the tray; 2) The valve plate of the float valve may be stuck and blown off, which will cause difficulties in operation and maintenance; 3) The pressure drop of the tray is large, Prevents applications at high gas phase loads

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, a kind of phosgene absorption tower, with reference to figure 1 , the tower body 2 is fixed on the tower base 1, the upper part of the tower body 2 is provided with a feed port 3, the tower base 1 is provided with a gas phase inlet 4, and the top of the tower body 2 is provided with an adsorption An agent distribution groove 5, an upper packing layer 6 is arranged below the adsorbent distribution groove 5, and the adsorbent distribution groove 5 can evenly distribute the adsorbent to the filler of the upper packing layer 6 below it, and a liquid is arranged at intervals below the upper packing layer 6. Collector 7, liquid distributor 8 and packing layer 9, the number of liquid collector 7, liquid distributor 8 and packing layer 9 is the same, liquid collector 7, liquid distributor 8 and packing layer 9 are 1-5 layers, this The embodiment adopts two layers, that is, the liquid collector 7, the liquid distributor 8, the packing layer 9, the liquid collector ...

Embodiment 2

[0024] Embodiment 2, a kind of phosgene absorption tower, with reference to figure 2 , on the basis of Example 1, a liquid pre-distributor 10 is provided above the lowermost liquid collector 7, and the adsorbent flowing to the bottom of the tower body 2 is sent to the liquid pre-distributor 10 by a circulation pump, Then it is distributed to the liquid collector 7 below it for reuse, and the others are identical to Embodiment 1.

Embodiment 3

[0025] Embodiment 3, a kind of phosgene absorption tower, with reference to figure 2 , on the basis of Example 2, the adsorbent distribution tank 5 is composed of a first-level tank 11 and a second-level tank 12, the first-level tank is a rectangular tank body, and a shallow groove 16 with serrated edges is fixed in the middle of the tank body , the bottom of the primary tank 11 is separated by a primary distribution port 17, the secondary tank 12 is composed of interconnected tank bodies 18, the tank body 18 is directly opposite the primary distribution port 17 above, and a secondary distribution port is distributed below the tank body 18. The hole 19, the upper packing layer 6 and the packing layer 9 are fixed with stainless steel corrugated plate structured packing 15 between the upper packing pressure ring 13 and the lower packing support ring 14, and the stainless steel corrugated plate structured packing 15 is corrugated with grooves and small holes on the surface. Shap...

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Abstract

The invention discloses a phosgene adsorbing tower which consists of a tower foundation, a tower body, a feeding hole and a gas phase inlet. The top inside the tower body is provided with an adsorbent distributing groove communicated with the feeding hole, an upper filling layer is arranged above the adsorbent distributing groove, liquid collectors, liquid distributors and filling layers are arranged at intervals below the upper filling layer, and the numbers of the liquid collectors, the liquid distributors and the filling layers are same. The invention has the characteristics of simple structure, easy disassembly and assembly, low cost, small pressure reduction inside the tower, adaptability to high gas phase load, high mass transfer efficiency, higher absorbing efficiency than a floating distillation tower, remarkably-improved phosgene treating ability, good phosgene absorbing effect and stable working.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, in particular to a phosgene absorption tower. Background technique [0002] Phosgene is an important organic intermediate, which is a highly toxic gas. At present, the absorption of phosgene is mainly carried out by absorption operation. At present, the absorption towers widely used at home and abroad are floating valve towers. Due to the skilled technology of floating valve towers And ideal absorption effect, it is recognized as the first choice of phosgene absorption tower. The existing floating valve tower has a circular valve hole on the tray, and a valve plate that can float up and down in an appropriate range is installed in the hole. When working, the gas rises from the valve hole, opens the valve plate, passes through the annular gap, and then blows into the liquid layer in the horizontal direction to form foam to achieve the purpose of absorption, but the floating valve tower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18C01B31/28
Inventor 林生财姜同坤郭文满吕来军刘克强张贵智
Owner YANTAI JULI ISOCYANIC ESTER
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