CN201379983Y

CN201379983Y - TDA dehydrating tower

Info

Publication number: CN201379983Y
Application number: CN200920017505U
Authority: CN
Inventors: 林生财; 姜同坤; 郭文满; 吕来军; 赵文涛
Original assignee: YANTAI JULI ISOCYANIC ESTER CO Ltd
Current assignee: Yantai Juli Fine Chemical Co Ltd
Priority date: 2009-01-06
Filing date: 2009-01-06
Publication date: 2010-01-13
Anticipated expiration: 2019-01-06

Abstract

The utility model discloses a TDA dehydrating tower which comprises a tower body, a backflow feeding pipe, a circulating gas-phase inlet opening and a rough TDA feeding opening; an upper distribution tank communicated with the backflow feeding pipe is arranged at the top in the tower body, an upper packing material layer is arranged below the upper distribution tank; a liquid collecting tray is arranged below the upper packing material layer; a liquid collecting tank is fixed below the liquid collecting tray; a downcomer communicated with the liquid collecting tank is arranged at the bottom of the liquid collecting tank and communicated with a lower distribution tank below the downcomer; and a lower packing material layer is arranged below the lower distribution tank. The TDA dehydrating tower has the characteristics of simple structure, easy assembly and disassembly, low cost, high degree of gas-liquid two-phase heat exchange and mass exchange, good separating effect and high efficiency.

Description

A kind of TDA dehydrating tower

Technical field

The utility model belongs to technical field of chemical, especially relates to a kind of TDA dehydrating tower.

Background technology

In the production process of toluene two ammoniums (TDA), will inevitably produce a large amount of water, and in the toluenediamine phosgenation process, even there is the existence of low amounts of water also can cause loss of yield and equipment corrosion.Therefore the water in the toluenediamine must be sloughed.At present domestic the TDA dehydration method is all adopted the method for board-like valve tower rectifying, have circular valve opening on the valve tower tower tray, the valve block that can fluctuate at proper range has been installed in the hole, gas rises from valve opening during work, back down valve block, pass the annulus, be blown into liquid layer with horizontal direction then, form foam, reach the absorption purpose, float valve is the gas-liquid mass transfer element of valve tower, and valve tower has following shortcoming: 1) when gas speed is low, still have the column plate leakage, cause plate efficiency to descend to some extent; 2) the float valve valve block has stuck and possibility stripping, and this can cause the difficulty of operation running and maintenance; 3) pressure of column plate falls greatlyyer, has hindered the application under high gas phase load; 4) liquid flooding takes place easily in distillation operation, anti-risk operability is relatively poor.

Summary of the invention

The purpose of this utility model is to improve the deficiency of prior art and provides a kind of simple in structure, easy disassembling, and cost is low, the high TDA dehydrating tower of degree height, good separating effect, efficient of gas-liquid two-phase heat exchange and matter exchange.

The purpose of this utility model is to realize like this, a kind of TDA dehydrating tower, form by tower body, backflow feed pipe, the import of circulation gas phase and thick TDA charging aperture, be characterized in that the tower body inner top is provided with the last distributing slot that is communicated with the feed pipe that refluxes, last distributing slot below is provided with packing layer, last packing layer below is provided with the liquid catch tray, liquid closing quotation below is fixed with liquid collection trough, the bottom of liquid collection trough is provided with the downspout that is communicated with it, downspout is communicated with the following distributing slot of its below, and following distributing slot below is provided with down packing layer.

In order further to realize the purpose of this utility model, can be that the described distributing slot of going up is to be provided with the secondary groove below the one-level groove with following distributing slot, the one-level groove is that rectangle cell body center fixed has a jagged shallow slot in edge, rectangle cell body bottom interval has one-level distribution mouth, the secondary groove is made up of the cell body that interconnects, cell body is over against the one-level distribution mouth of top, and the cell body bottom surface distributes and has secondary distribution hole.

In order further to realize the purpose of this utility model, can be that the described packing layer of going up is to go up between filler pressing and following filler bracing ring to be fixed with by the superimposed stainless steel cloth ripple plate-like structured packing of forming of the mutual arranged vertical of stainless steel cloth corrugated plate.

In order further to realize the purpose of this utility model, can be that described packing layer down is to go up between filler pressing and following filler bracing ring to be fixed with the stainless steel corrugated plate regular packing, the stainless steel corrugated plate regular packing be by the superimposed plate-like structured packing of forming of the mutual arranged vertical of stainless steel wave card with rill and aperture.

In order further to realize the purpose of this utility model, can be described liquid catch tray be made up of the corrosion resistant plate that has folding draining plate below tilted-putted.

In order further to realize the purpose of this utility model, can be that described liquid collection trough is the short cannelure in the high outer ring of inner ring that is fixed on the tower body inwall.

Compared with the prior art the utility model has following distinguishing feature and good effect: the utility model adopts the tower body inner top to be provided with the last distributing slot that is communicated with the feed pipe that refluxes, last distributing slot below is provided with packing layer, last packing layer below is provided with the liquid catch tray, liquid closing quotation below is fixed with liquid collection trough, the bottom of liquid collection trough is provided with the downspout that is communicated with it, downspout is communicated with the following distributing slot of its below, following distributing slot below is provided with down packing layer, the next thick TDA of TDA storage tank enters the liquid collection trough from the thick TDA charging aperture in dehydrating tower middle part like this, under after liquid is received packing layer flows down on the material that comes from the TDA storage tank in the groove and the dehydrating tower liquid stream and fully mixed, flowing to the one-level groove of distributing slot by downspout, leave one-level distribution mouth below the one-level groove, liquid evenly spreads in the secondary groove by one-level distribution mouth, leaving secondary distribution hole below the secondary groove is dispersed in down material on the filler of packing layer uniformly, the bottoms material is entering in the tower from circulation gas phase inlet through tower bottom reboiler heating back vaporization formation air-flow, be upward through down packing layer, the liquid stream that flows downward fully contacts at filling surface with the gas stream that upwards flows, gas-liquid two-phase carries out heat exchange and mass exchange, gas phase is carried out partial condensation, make the component (TDA) of the wherein difficult volatilization of part change liquid phase over to, and the latent heat of emitting during vapor condensation is also passed to liquid phase, make the liquid phase part vaporization, wherein the volatile component of part (moisture) changes in the gas phase, gas phase continues through last packing layer after passing down packing layer, the liquid of backflow feed pipe is by the one-level groove of last distributing slot, the secondary groove enters packing layer, the liquid stream that flows downward fully contacts at the filling surface of last packing layer with the gas stream that upwards flows, gas-liquid two-phase carries out heat exchange and mass exchange, gas phase is carried out partial condensation, make the component (TDA) of the wherein difficult volatilization of part change liquid phase over to, and the latent heat of emitting during vapor condensation is also passed to liquid phase, make the liquid phase part vaporization, wherein the volatile component of part (moisture) changes in the gas phase, it is more and more higher that the long and makes the liquid on filling surface flow the concentration of heavy ends from top to bottom, the air-flow concentration of light component from bottom to top is more and more higher, thereby reaches the effect of separation; Liquid distributing groove, liquid distribution trough, liquid catch tray, liquid collection trough mainly are to guarantee that liquid is distributed on the filler uniformly, guarantee assimilation effect, structured packing can reduce channel wall flow phenomenon and take place, have that pressure drop is low, flux is high, liquid holdup is little, uniform gas-liquid distribution, almost there is not enlarge-effect, the mass-transfer efficiency height, simultaneously cheap; The structure that the utility model adopts, be far longer than the float-valve type rectifying column in equal tower diameter situation gas-liquid contact area, the degree of gas-liquid two-phase heat exchange and matter exchange improves greatly, good separating effect and cost are low, operability also is better than the float-valve type rectifying column, disposal ability doubles, and has reduced the loss of yield and the equipment corrosion of lower procedure.

Description of drawings

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is a kind of structural representation of the present utility model.

Fig. 2 is an another kind of structural representation of the present utility model.

Fig. 3 is a kind of structural representation of upper and lower distributing slot of the present utility model.

Fig. 4 is a kind of structural representation at liquid catch tray of the present utility model, liquid collection trough, downspout and following distributing slot position.

Fig. 5 is a liquid catch tray vertical view of the present utility model.

The specific embodiment

Embodiment 1, a kind of TDA dehydrating tower, with reference to Fig. 1, be to be provided with backflow feed pipe 1 on the top of tower body 19, the bottom is provided with circulation gas phase import 15, the middle part is provided with thick TDA charging aperture 16, tower body 19 inner tops are provided with the last distributing slot 2 that is communicated with the feed pipe 1 that refluxes, last distributing slot 2 belows are provided with packing layer 3, last packing layer 3 belows are provided with liquid catch tray 4, liquid 4 belows that close are fixed with liquid collection trough 5, and thick TDA charging aperture 16 is communicated with liquid collection troughs 5, and the bottom of liquid collection trough 5 is provided with the downspout 6 that is communicated with it, downspout 6 is communicated with the following distributing slot 7 of its below, following distributing slot 7 belows are provided with down packing layer 8, last packing layer 3 and following packing layer 8 that last distributing slot 2 and following distributing slot 7 can evenly distribute liquid and give its below respectively, and this has constituted a kind of structure of the present utility model.

Embodiment 2, a kind of TDA dehydrating tower, with reference to Fig. 2, Fig. 3, Fig. 4, Fig. 5, be on the basis of embodiment 1, last distributing slot 2 and following distributing slot 7 are to be provided with secondary groove 10 below one-level groove 9, one-level groove 9 is that rectangle cell body center fixed has a jagged shallow slot 11 in edge, rectangle cell body bottom interval has one-level distribution mouth 12, secondary groove 12 is made up of the cell body 13 that interconnects, cell body 13 is over against the one-level distribution mouth 12 of top, cell body 13 bottom surfaces distribute and have secondary distribution hole 14, last packing layer 3 is that last filler pressing 17 and 18 of following filler bracing rings are fixed with by the superimposed stainless steel cloth ripple plate-like structured packing of forming of the mutual arranged vertical of stainless steel cloth corrugated plate, following packing layer 8 is that last filler pressing 17 and 18 of following filler bracing rings are fixed with the stainless steel corrugated plate regular packing, the stainless steel corrugated plate regular packing is by the superimposed plate-like structured packing of forming of the mutual arranged vertical of stainless steel wave card with rill and aperture, liquid catch tray 4 is made up of the corrosion resistant plate that has folding draining plate below tilted-putted, liquid collection trough 5 is that the doughnut-shaped steel plate full weld is on tower body 19 inwalls, the centre is provided with the circular trough 20 of a projection, circular trough 20 bottoms are provided with and fall liquid mouth 21, fall that liquid mouth 21 is communicated with downspout 6, downspout 6 is communicated with the following distributing slot 7 of its below, and other and embodiment 1 are identical.

When using the utility model, thick TDA enters the liquid collection trough 5 from the thick TDA charging aperture 16 in dehydrating tower middle part, under after liquid is received packing layer 3 flows down on the material that comes from the TDA storage tank in the groove 5 and the dehydrating tower liquid stream and fully mixed, flowing to the one-level groove 9 of distributing slot 7 by downspout 6, the jagged edge of the shallow slot 11 of one-level groove 9 is evenly distributed to liquid in the rectangle cell body, liquid evenly spreads in the secondary groove 10 by one-level distribution mouth 12 then, the secondary distribution hole 14 of secondary groove 10 bottom surfaces is dispersed in down material on the filler of packing layer 8 uniformly, the bottoms material is entering in the tower from circulation gas phase inlet 15 through tower bottom reboiler heating back vaporization formation air-flow, be upward through down packing layer 8, the liquid stream that flows downward fully contacts at the filling surface of following packing layer 8 with the gas stream that upwards flows, gas-liquid two-phase carries out heat exchange and mass exchange, gas phase is carried out partial condensation, make the component (TDA) of the wherein difficult volatilization of part change liquid phase over to, and the latent heat of emitting during vapor condensation is also passed to liquid phase, make the liquid phase part vaporization, wherein the volatile component of part (moisture) changes in the gas phase, gas phase is passed down packing layer 8 backs and is continued through last packing layer 3, the liquid of backflow feed pipe 1 is by the one-level groove 9 of last distributing slot 2, secondary groove 10 enters packing layer 3, the liquid stream that flows downward fully contacts at filling surface with the gas stream that upwards flows, gas-liquid two-phase carries out heat exchange and mass exchange, gas phase is carried out partial condensation, makes the component (TDA) of the wherein difficult volatilization of part change liquid phase over to; And the latent heat of emitting during vapor condensation is also passed to liquid phase, make the liquid phase part vaporization, wherein the volatile component of part (moisture) changes in the gas phase, it is more and more higher that the long and makes the liquid on filling surface flow the concentration of heavy ends from top to bottom, the air-flow concentration of light component from bottom to top is more and more higher, thereby reaches the effect of separation.

Claims

1, a kind of TDA dehydrating tower, be by tower body (19), backflow feed pipe (1), circulation gas phase import (15) and thick TDA charging aperture (16) are formed, it is characterized in that tower body (19) inner top is provided with the last distributing slot (2) that is communicated with the feed pipe that refluxes (1), last distributing slot (2) below is provided with packing layer (3), last packing layer (3) below is provided with liquid catch tray (4), liquid closing quotation (4) below is fixed with liquid collection trough (5), the bottom of liquid collection trough (5) is provided with the downspout (6) that is communicated with it, downspout (6) is communicated with the following distributing slot (7) of its below, and following distributing slot (7) below is provided with down packing layer (8).

2, a kind of TDA dehydrating tower according to claim 1, it is characterized in that described upward distributing slot (2) and following distributing slot (7) are to be provided with secondary groove (10) in one-level groove (9) below, one-level groove (9) is that rectangle cell body center fixed has a jagged shallow slot in edge (11), rectangle cell body bottom interval has one-level distribution mouthful (12), secondary groove (12) is made up of the cell body that interconnects (13), cell body (13) distributes mouthful (12) over against the one-level of top, and cell body (13) bottom surface distributes and has secondary distribution hole (14).

3, a kind of TDA dehydrating tower according to claim 1 is characterized in that the described packing layer (3) of going up is to go up between filler pressing (17) and following filler bracing ring (18) to be fixed with by the superimposed stainless steel cloth ripple plate-like structured packing of forming of the mutual arranged vertical of stainless steel cloth corrugated plate.

4, a kind of TDA dehydrating tower according to claim 1, it is characterized in that described packing layer (8) down is to go up between filler pressing (17) and following filler bracing ring (18) to be fixed with the stainless steel corrugated plate regular packing, the stainless steel corrugated plate regular packing is by the superimposed plate-like structured packing of forming of the mutual arranged vertical of stainless steel wave card with rill and aperture.

5, a kind of TDA dehydrating tower according to claim 1 is characterized in that described liquid catch tray (4) is made up of the corrosion resistant plate that has folding draining plate below tilted-putted.

6, a kind of TDA dehydrating tower according to claim 1, it is characterized in that described liquid collection trough (5) be the doughnut-shaped steel plate full weld on tower body (19) inwall, the centre is provided with the circular trough (20) of a projection, circular trough (20) bottom is provided with and falls liquid mouth (21).