CN202823099U - Vinyl cyanide absorption tower - Google Patents
Vinyl cyanide absorption tower Download PDFInfo
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- CN202823099U CN202823099U CN 201220381066 CN201220381066U CN202823099U CN 202823099 U CN202823099 U CN 202823099U CN 201220381066 CN201220381066 CN 201220381066 CN 201220381066 U CN201220381066 U CN 201220381066U CN 202823099 U CN202823099 U CN 202823099U
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- absorbing tower
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Abstract
The utility model provides a vinyl cyanide absorption tower which comprises an upper packing section arranged at an absorbed water feed inlet, a lower packing section arranged at a liquid phase feed inlet, and a tower plate section arranged between the upper packing section and the lower packing section. The tower plate section is provided with a plurality of sieve plates or float valve tower plates, and one sides of the sieve plates or the float valve tower plates are arranged on the sidewall of the vinyl cyanide absorption tower at intervals. A plurality of sieve pores or float valve holes are formed in the sieve plates or the float valve tower plates. The other side of each sieve plate or each float valve tower plate is provided with a liquid layer baffle. Gas rising areas are reserved between the liquid layer baffles and the other sidewall of the vinyl cyanide absorption tower. According to the vinyl cyanide absorption tower, the tower plate section enables the gas to flow in a baffling mode. Compared with a traditional liquid baffling method, pressure drop of the whole tower can be substantially reduced, the pressure drop of a single plate of the vinyl cyanide absorption tower is just below 20% of that of a single plate of traditional tower plates, and the pressure drop of the whole tower is just 59% of that of an existing four-section composite absorption tower, and consequently the vinyl cyanide absorption tower facilitates improving single pass yield of vinyl cyanide. Through adoption of the plate-type tower plates, damage of blocking of ropy substances can be effectively prevented.
Description
Technical field
The utility model relates to chemical products production equipment technical field, and specifically, the utility model relates to a kind of acrylonitrile absorbing tower in the process for production of acrylonitrile.
Background technology
Acrylonitrile (Acrylonitrile) is a kind of colourless pungent smell liquid that has, belong to popular basic organic chemical industry product, three large synthetic material---the basic and important raw materials of synthetic fibers, synthetic rubber, plastics, of many uses in organic synthesis industry and people's economic life.
The main flow technique of present industrial production acrylonitrile is propylene ammmoxidation process.Propylene, ammonia and air react under catalyst action, and gas enters the absorption tower through quench tower except behind the ammonia after the reaction, and the poor-water of follow-up refined unit absorbs the organic matters such as acrylonitrile, acetonitrile and hydrogen cyanide, and absorption liquid removes follow-up refined unit separating-purifying.Because above-mentioned poor-water contains a certain amount of restructuring and divides (major part is polymer), under the cryogenic conditions of absorption tower, easily form thick substances, adhere to column plate or filler, especially can cause filler to stop up and the separative efficiency reduction.In addition, the ammoxidation of propylene reaction is a volume augmenting response, reduces the carrying out that reaction pressure is conducive to the acrylonitrile main reaction, can improve the acrylonitrile once through yield.
Therefore, desirable acrylonitrile absorbing tower must low pressure drop and is difficult for being the thick substances obstruction.Present absorption tower equipment mainly contains plate column and packed tower two large types, and the former cost is low, difficult to be that thick substances stops up, but traditional plate column pressure drop is large.Although the packed tower pressure drop is low, the high and easy obstruction of cost.In the early stage industrial design, acrylonitrile absorbing tower adopts syllogic composite absorbent tower, namely formed by low temperature absorption water charging aperture top packing section, liquid phase feeding mouth bottom packing section and column plate section between the two, pressure drop more all adopts traditional plate column low, and low-temperature zone still adopts traditional column plate, also is difficult for stopping up for thick substances.But pressure drop is still higher.
Granted publication is number for the Chinese utility model patent of CN1055917C discloses a kind of acrylonitrile absorbing tower, and Fig. 1 is the simple structure schematic diagram of an acrylonitrile absorbing tower in the prior art.Among the figure each label to refer to feature as follows: 1 is the tail gas drain, and 2 for absorbing water (poor-water) charging aperture, and 3 is upper packing section, 4 is the material cooler group, and 5 is the column plate section, and 6 is the liquid phase feeding mouth, 7 is lower packing section, and 8 is the gas-phase feed mouth, and 9 is the absorption liquid discharging opening.As seen, it adopts four-part form composite absorbent tower, namely on above-mentioned three sections composite absorbent tower foundations, increases by a packing section at middle liquid phase charging aperture and replaces part column plate section, thereby further reduce full tower pressure drop, improves operational capacity.But also increased the risk of stopping up, and improved cost.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of acrylonitrile absorbing tower, and this absorption tower pressure drop is low, be difficult for for thick substances obstruction and cost low.
For solving the problems of the technologies described above, the utility model provides a kind of acrylonitrile absorbing tower, comprise the upper packing section that absorbs water charging aperture place, the lower packing section at liquid phase feeding mouth place and on described column plate section between packing section and the described lower packing section;
Wherein, described column plate section comprises that from bottom to up polylith one side is arranged at intervals at sieve plate or the valve plate on the described acrylonitrile absorbing tower sidewall, is distributed with a plurality of sieve apertures or float valve hole on described sieve plate or the valve plate;
The opposite side of described sieve plate or valve plate has the liquid layer baffle plate, leaves between described liquid layer baffle plate and the described acrylonitrile absorbing tower another side sidewall and rises the gas area.
Alternatively, the height of described liquid layer baffle plate is not more than 3/4 of the described sieve plate of polylith or valve plate spacing.
Alternatively, the height of described liquid layer baffle plate is not more than 2/3 of the described sieve plate of polylith or valve plate spacing.
Alternatively, the described sieve plate of described column plate section or valve plate total quantity are 5～30.
Alternatively, the filler in described upper packing section and the described lower packing section is one or more in granular filler, plate flower filler, the structured packing.
Alternatively, described acrylonitrile absorbing tower top has the tail gas drain, and described absorption water charging aperture also is positioned at its top;
Be provided with the material cooler group between described upper packing section and the described column plate section;
Described acrylonitrile absorbing tower bottom is provided with gas-phase feed mouth and absorption liquid discharging opening, and described liquid phase feeding mouth also is positioned at its bottom.
Alternatively, described sieve plate is common sieve aperture sieve plate or linde sieve tray.
Alternatively, the described gas area that rises lacks shape, square, circular or oval for circle.
Compared with prior art, the utlity model has following advantage:
Acrylonitrile absorbing tower of the present utility model is composite structure, column plate section wherein makes gas flow in the mode of baffling, compare with the liquid baffling mode of traditional column plate, but the full tower pressure drop of decrease, the veneer pressure drop only is below 20% of traditional column plate veneer pressure drop, full tower pressure drop only is 59% of existing four sections compound (wherein three sections are filler) absorption towers, is conducive to improve the once through yield of acrylonitrile.Owing to adopting board-like column plate, the utility model can effectively be avoided the harm of thick substances obstruction, and cost is also lower in addition.
Contrast traditional plate column and have downspout, liquid forms liquid layer at column plate, flow to lower one deck column plate by downspout, and liquid presents tortuous flow regime in the tower, and gas rises from sieve aperture or float valve, with the liquid layer cross-flow mass transfer on the column plate.Column plate section of the present utility model does not have downspout, and liquid descends at column plate formation liquid layer and by sieve aperture, and gas carries out mass transfer with the liquid that drips in distance between plates, and rises by rising on the gas area, and gas presents tortuous flow regime in tower.This mode has not only increased gas-liquid mass transfer area, and gas reduced resistance by liquid layer, has reduced anode drop.
Description of drawings
The above and other feature of the present utility model, character and advantage will become more obvious by the description below in conjunction with drawings and Examples, wherein:
Fig. 1 is the simple structure schematic diagram of an acrylonitrile absorbing tower of the prior art;
Fig. 2-a is the simple structure schematic diagram of the acrylonitrile absorbing tower of an embodiment of the utility model;
Fig. 2-b is the schematic diagram of gas baffling direction in the tower of acrylonitrile absorbing tower of the embodiment of the utility model shown in Fig. 2-a;
Fig. 3 is that the acrylonitrile absorbing tower of the embodiment of the utility model shown in Fig. 2-a or Fig. 2-b is along the cross-sectional view of A-A line;
Fig. 4 is the pipeline structure schematic diagram of the cold model experiment device of an embodiment of the utility model.
The specific embodiment
The utility model is described in further detail below in conjunction with specific embodiments and the drawings; set forth in the following description more details so that fully understand the utility model; but the utility model obviously can be implemented with the multiple alternate manner that is different from this description; those skilled in the art can be in the situation that do similar popularization, deduction without prejudice to the utility model intension according to practical situations, therefore should be with the content constraints of this specific embodiment protection domain of the present utility model.
Fig. 2-a is the simple structure schematic diagram of the acrylonitrile absorbing tower of an embodiment of the utility model.It should be noted that these and follow-up other accompanying drawing all only as example, it is not to be to draw according to the condition of equal proportion, and should not be construed as limiting as the protection domain to the utility model actual requirement with this.
Shown in Fig. 2-a, the top of this acrylonitrile absorbing tower has tail gas drain 201 and absorbs water (poor-water) charging aperture 202, and upper packing section 203 is positioned at and absorbs water charging aperture 202 places, and lower packing section 207 is positioned at liquid phase feeding mouth 206 places of bottom, absorption tower.The filler that upper packing section 203 and lower packing section are 207 li is one or more in granular filler, plate flower filler, the structured packing, has column plate section 205 between upper packing section 203 and the lower packing section 207.Also be provided with material cooler group 204 between upper packing section 203 and the column plate section 205.The acrylonitrile absorbing tower bottom is provided with gas-phase feed mouth 208 and absorption liquid discharging opening 209.Wherein, column plate section 205 comprises that from bottom to up polylith one side is arranged at intervals at sieve plate or the valve plate 210 without downspout on the acrylonitrile absorbing tower sidewall, and total quantity can have 10～22.This sieve plate can be common sieve aperture sieve plate or linde sieve tray.
Fig. 2-b is the schematic diagram of gas baffling direction in the tower of acrylonitrile absorbing tower of the embodiment of the utility model shown in Fig. 2-a.Shown in Fig. 2-b, curve 214 namely represents gas baffling direction in the tower of the present embodiment, and gas upwards flows in the repeatedly bending that rises between the gas area of each piece column plate.
Fig. 3 is that the acrylonitrile absorbing tower of the embodiment of the utility model shown in Fig. 2-a or Fig. 2-b is along the cross-sectional view of A-A line.As shown in Figure 3, be distributed with a plurality of sieve apertures or float valve hole 213 on this sieve plate or the valve plate 210, the diameter of the sieve aperture on the sieve plate can be 6～8 millimeters, and the diameter in the float valve hole 213 on the valve plate 210 can be 45 millimeters.And the opposite side of sieve plate or valve plate 210 has liquid layer baffle plate 211, and the height of this liquid layer baffle plate 211 is preferably and is not more than 3/4 of polylith sieve plate or valve plate 210 spacings, more preferably is not more than 2/3 of polylith sieve plate or valve plate 210 spacings.Leave between liquid layer baffle plate 211 and the acrylonitrile absorbing tower another side sidewall and rise gas area 212, the shape that rises gas area 212 can lack shape, square, circular or oval for circle.
The liquid level that liquid forms on these liquid layer baffle plate 211 control sieve plates or the valve plate 210 forces the uprising gas baffling to rise through rising on the gas area, and liquid vertically descends by sieve aperture or float valve hole 213 by Action of Gravity Field, and gas-liquid two-phase carries out mass transfer at whole plate spacing.
Theoretical cam curve in the upper packing section 203 of acrylonitrile absorbing tower of the present utility model is generally 2～4, and the theoretical cam curve in the column plate section 205 is generally 5～30, and the theoretical cam curve in the lower packing section 207 is generally 7～12.
The operation principle on absorption tower of the present utility model is as follows: in Acrylonitrile Production, except the cooled reactant gas phase of ammonia, it consists of acrylonitrile, acetonitrile, hydrogen cyanide and a small amount of organic matter, the light components such as a large amount of carbon dioxide, nitrogen, steam, temperature is generally 20～40 ℃, enters bottom, absorption tower of the present utility model.Except the cooled liquid phases of reactants aqueous solution of ammonia, contain identical component and temperature with gas phase, be cooled to the top that enters lower packing section 207 about 10 ℃ through condenser.From the next poor-water (its temperature is generally 37～38 ℃) after the heat exchange temperature adjustment of follow-up refined unit, enter top, absorption tower as absorbing water by absorbing water charging aperture 202, in upper packing section 203 with the absorption tail gas counter current contacting that rises, side line is extracted out entirely after reclaiming a part of cold, is entering after material cooler group 204 is cooled to 2～7 ℃ on 205 first blocks of column plates 210 of column plate section.Tail gas after the absorption is by 201 emptying of tail gas drain, and the organic aqueous solutions such as the acrylonitrile that absorbs, acetonitrile, hydrogen cyanide enter follow-up refined unit (not shown).
Embodiment 1: cold model experiment
In 800 * 100 rectangle test towers, adopt Air-Water-acetone system to carry out cold model experiment.Fig. 4 is the pipeline structure schematic diagram of the cold model experiment device of this embodiment.Establish 7 layers of common single overflow sieve plate with downspout, valve plate in the absorption tower or compare test without the downspout tower plate for gas baffling.
Among this Fig. 4 each label to refer to feature as follows: 401 are demister, and 402 is spinner flowmeter, and 403 is valve, and 404 is centrifugal pump, 405 is the pond, and 406 is U-shaped differential manometer, and 407 is the heating tape, and 408 is air blast, 409 is the acetone storage tank, and 410 is the first sample tap, and 411 is the second sample tap.
The structural parameters of common single overflow sieve plate are as follows:
Fall liquid zone area 10%, rise gas area percent opening 8.81%, 8 millimeters of sieve diameters, 400 millimeters of distances between plates.
The structural parameters of valve plate are as follows:
Fall liquid zone area 10%, rise gas area percent opening 10.2%, 45 millimeters of float valve bore dias, 400 millimeters of distances between plates.
Structural parameters without the downspout tower plate for gas baffling are as follows:
Rise gas area area 18%, fall liquid zone percent opening 4.95%, 6 millimeters of sieve diameters, 400 millimeters of distances between plates, 100 millimeters of liquid layer heights of baffle plate.
Test(ing) liquid load 6m
3/ hr, gas speed 5.0m/s between plate.
Result of the test is as follows:
Be 5 millimeters of water without the pressure drop of downspout tower plate for gas baffling veneer, plate efficiency is 60%;
The pressure drop of common single overflow sieve plate veneer is 30 millimeters of water, and plate efficiency is 59%;
The pressure drop of valve plate veneer is 35 millimeters of water, and plate efficiency is 61%.
Comparative Examples 1:
Adopting Granted publication number be the four stage composite acrylonitrile absorbing towers of the embodiment 5 in the Chinese utility model patent of CN1055917C and the conditional operation of operating mode 2, and the tower pressure drop is 0.17kg/cm entirely
3, its operating flexibility is 60～120%.
Embodiment 2:
Adopt the utility model syllogic composite absorbent tower, the filler in the packing section is the same with Comparative Examples 1 up and down, and its operation operating mode and technological requirement are with Comparative Examples 1 without downspout gas baffling sieve plate in 28 of middle employings, and the full tower pressure drop of result is 0.10kg/cm
3, its operating flexibility is 50～150%.
Acrylonitrile absorbing tower of the present utility model is composite structure, column plate section wherein makes gas flow in the mode of baffling, compare with the liquid baffling mode of traditional column plate, but the full tower pressure drop of decrease, the veneer pressure drop only is below 20% of traditional column plate veneer pressure drop, full tower pressure drop only is 59% of existing four sections compound (wherein three sections are filler) absorption towers, is conducive to improve the once through yield of acrylonitrile.Owing to adopting board-like column plate, the utility model can effectively be avoided the harm of thick substances obstruction, and cost is also lower in addition.
Contrast traditional plate column and have downspout, liquid forms liquid layer at column plate, flow to lower one deck column plate by downspout, and liquid presents tortuous flow regime in the tower, and gas rises from sieve aperture or float valve, with the liquid layer cross-flow mass transfer on the column plate.Column plate section of the present utility model does not have downspout, and liquid descends at column plate formation liquid layer and by sieve aperture, and gas carries out mass transfer with the liquid that drips in distance between plates, and rises by rising on the gas area, and gas presents tortuous flow regime in tower.This mode has not only increased gas-liquid mass transfer area, and gas reduced resistance by liquid layer, has reduced anode drop.
Although the utility model with preferred embodiment openly as above, it is not to limit the utility model, and any those skilled in the art can make possible change and modification within not breaking away from spirit and scope of the present utility model.Therefore, every content that does not break away from technical solutions of the utility model, all falls within the protection domain that the utility model claim defines any modification, equivalent variations and modification that above embodiment does according to technical spirit of the present utility model.
Claims (8)
1. acrylonitrile absorbing tower, comprise be positioned at the upper packing section (203) that absorbs water charging aperture (202) and locate, be positioned at the lower packing section (207) that liquid phase feeding mouth (206) locates and be positioned at described upper packing section (203) and described lower packing section (207) between column plate section (205);
It is characterized in that, described column plate section (205) comprises that from bottom to up polylith one side is arranged at intervals at sieve plate or the valve plate (210) on the described acrylonitrile absorbing tower sidewall, is distributed with a plurality of sieve apertures or float valve hole (213) on described sieve plate or the valve plate (210);
The opposite side of described sieve plate or valve plate (210) has liquid layer baffle plate (211), leaves between described liquid layer baffle plate (211) and the described acrylonitrile absorbing tower another side sidewall and rises gas area (212).
2. acrylonitrile absorbing tower according to claim 1 is characterized in that, the height of described liquid layer baffle plate (211) is not more than 3/4 of the described sieve plate of polylith or valve plate (210) spacing.
3. acrylonitrile absorbing tower according to claim 2 is characterized in that, the height of described liquid layer baffle plate (211) is not more than 2/3 of the described sieve plate of polylith or valve plate (210) spacing.
4. each described acrylonitrile absorbing tower in 3 according to claim 1 is characterized in that, the described sieve plate of described column plate section (205) or valve plate (210) total quantity are 5～30.
5. acrylonitrile absorbing tower according to claim 1 is characterized in that, described upper packing section (203) and the inner filler of described lower packing section (207) are one or more in granular filler, plate flower filler, the structured packing.
6. acrylonitrile absorbing tower according to claim 1 is characterized in that:
Described acrylonitrile absorbing tower top has tail gas drain (201), and described absorption water charging aperture (202) also is positioned at its top;
Be provided with material cooler group (204) between described upper packing section (203) and the described column plate section (205);
Described acrylonitrile absorbing tower bottom is provided with gas-phase feed mouth (208) and absorption liquid discharging opening (209), and described liquid phase feeding mouth (206) also is positioned at its bottom.
7. acrylonitrile absorbing tower according to claim 1 is characterized in that, described sieve plate is common sieve aperture sieve plate or linde sieve tray.
8. acrylonitrile absorbing tower according to claim 1 is characterized in that, the described gas area (212) that rises lacks shape, square, circular or oval for circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220381066 CN202823099U (en) | 2012-08-02 | 2012-08-02 | Vinyl cyanide absorption tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220381066 CN202823099U (en) | 2012-08-02 | 2012-08-02 | Vinyl cyanide absorption tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202823099U true CN202823099U (en) | 2013-03-27 |
Family
ID=47934900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220381066 Expired - Lifetime CN202823099U (en) | 2012-08-02 | 2012-08-02 | Vinyl cyanide absorption tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202823099U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103566713A (en) * | 2012-08-02 | 2014-02-12 | 宁波科元塑胶有限公司 | Acrylonitrile absorption tower |
| CN105451860A (en) * | 2013-09-20 | 2016-03-30 | 斗山能捷斯有限责任公司 | A scrubber tower of a flue gas purification device |
-
2012
- 2012-08-02 CN CN 201220381066 patent/CN202823099U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103566713A (en) * | 2012-08-02 | 2014-02-12 | 宁波科元塑胶有限公司 | Acrylonitrile absorption tower |
| CN105451860A (en) * | 2013-09-20 | 2016-03-30 | 斗山能捷斯有限责任公司 | A scrubber tower of a flue gas purification device |
| US9776128B2 (en) | 2013-09-20 | 2017-10-03 | Doosan Lentjes Gmbh | Scrubber tower of a flue gas purification device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Port Road Qingshi Industrial Zone Beilun District Zhejiang city of Ningbo province No. 98 315803 Patentee after: Ningbo Keyuan Jinghua Co.,Ltd. Patentee after: EAST CHINA University OF SCIENCE AND TECHNOLOGY Address before: Port Road Qingshi Industrial Zone Beilun District Zhejiang city of Ningbo province No. 98 315803 Patentee before: NINGBO KEYUAN PETROCHEMICALS Co.,Ltd. Patentee before: EAST CHINA University OF SCIENCE AND TECHNOLOGY |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Port Road Qingshi Industrial Zone Beilun District Zhejiang city of Ningbo province No. 98 315803 Patentee after: NINGBO KEYUAN PETROCHEMICALS Co.,Ltd. Patentee after: EAST CHINA University OF SCIENCE AND TECHNOLOGY Address before: 315803 Ningbo, Zhejiang Province No.98, Gangkou Road, Qingshi Industrial Zone, Beilun District, Ningbo City, Zhejiang Province Patentee before: NINGBO KEYUAN PLASTIC Co.,Ltd. Patentee before: EAST CHINA University OF SCIENCE AND TECHNOLOGY |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |