Multi-specification fuming sulfuric acid preparation system

Abstract

The utility model provides a multi-specification fuming sulfuric acid preparation system. The multi-specification fuming sulfuric acid preparation system comprises a nicotinic acid tower, a first temperature control circulating unit, a second temperature control circulating unit and a cooling unit, a tower plate structure is arranged in a tower cavity of the nicotinic acid tower, and an upper cavity and a lower cavity are formed at the same time. A first absorption unit is arranged in the upper cavity, and a second absorption unit is arranged in the lower cavity. The nicotinic acid tower is provided with an absorption liquid inlet and a feeding hole. The first temperature control circulating unit and the second temperature control circulating unit can collect fuming sulfuric acid formed in the upper cavity and the lower cavity respectively, and the collected fuming sulfuric acid is fed into the corresponding absorption units after being subjected to temperature control. And the cooling unit can circularly feed the gas led out from the tower top to the tower bottom and cool the gas in the circulating process. The multi-specification fuming sulfuric acid preparation system provided by the utility model can ensure that the temperature in the nicotinic acid tower is controlled and adjusted to be proper in the circulating process, so that the preparation effect of fuming sulfuric acid is ensured, and the practicability is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of fuming sulfuric acid preparation technology, and specifically relates to a multi-specification fuming sulfuric acid preparation system. BACKGROUND

[0002] Fuming sulfuric acid is a high-concentration sulfuric acid solution containing additional SO3 and has extremely strong corrosiveness and hygroscopicity. It has a wide range of applications in the fields of organic synthesis, petroleum industry, dyes, pharmaceutical industry, chemical fertilizer production and metal processing.

[0003] In the prior art, fuming sulfuric acid production needs to use a sulfuric acid tower, and the SO3 rising from the bottom is absorbed by the concentrated sulfuric acid and / or low-concentration fuming sulfuric acid added from the upper part. In order to produce fuming sulfuric acid of multiple specifications (different SO3 contents), the sulfuric acid tower is usually provided with multiple-stage absorption units from top to bottom, so that the absorption is more complete, and fuming sulfuric acid of multiple specifications can be produced. The process of absorbing SO3 by using concentrated sulfuric acid or fuming sulfuric acid (absorbent) is an exothermic process, and therefore the temperature in the tower will continuously increase. The increase in temperature will increase the saturated vapor pressure of the absorbent, thereby reducing the absorption efficiency of the absorbent to SO3, and the safety will also be reduced. However, the preparation of fuming sulfuric acid and the multi-stage absorption sulfuric acid tower lack effective temperature regulation, and the practicability is poor. UTILITY MODEL CONTENT

[0004] The utility model embodiment provides a multi-specification fuming sulfuric acid preparation system, and aims to solve the problem of poor practicability of the existing multi-specification fuming sulfuric acid preparation due to lack of effective temperature regulation.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a multi-specification fuming sulfuric acid preparation system, comprising:

[0006] The sulfuric acid tower has a tower cavity, the tower cavity is internally provided with a tower plate structure, the tower plate structure separates the tower cavity to form an upper cavity and a lower cavity; the upper cavity is provided with a first absorption unit, and the lower cavity is provided with a second absorption unit; the top end of the sulfuric acid tower is provided with an absorption liquid inlet for adding concentrated sulfuric acid and communicating with the upper cavity, and the bottom end is provided with a feed inlet for adding gas and communicating with the lower cavity;

[0007] The first temperature control circulating unit corresponds to the upper cavity, is used for collecting low-concentration fuming sulfuric acid formed by the upper cavity, and is used for sending the collected low-concentration fuming sulfuric acid to the first absorption unit after temperature control;

[0008] The second temperature control circulating unit corresponds to the lower cavity, is used for collecting high-concentration fuming sulfuric acid formed by the lower cavity, and is used for sending the collected high-concentration fuming sulfuric acid to the second absorption unit after temperature control;

[0009] A cooling unit is connected to the top end and the bottom end of the nicotinic acid tower respectively, and is used to circulate the gas from the top to the bottom of the tower and cool the gas during the circulation.

[0010] In a possible implementation, the top of the upper chamber is provided with an upper distributor connected to the inlet of the absorption liquid.

[0011] In a possible implementation, the first absorption unit comprises:

[0012] A first filler layer is arranged below the upper distributor;

[0013] A second filler layer is arranged below the first filler layer;

[0014] A redistribution device is arranged between the first filler layer and the second filler layer, and the inlet of the redistribution device extends out of the nicotinic acid tower and is connected to the first temperature control circulation unit.

[0015] In a possible implementation, the first temperature control circulation unit comprises:

[0016] A first collection tank is connected to the first material outlet at the bottom of the upper chamber through a pipeline, and a first delivery pump is arranged in the first collection tank;

[0017] A first heat exchanger has a temperature control channel, and the temperature control channel of the first heat exchanger is connected to the outlet of the first delivery pump and the redistribution device through pipelines respectively.

[0018] In a possible implementation, the second absorption unit comprises:

[0019] A third filler layer is arranged below the tray structure and above the feed inlet;

[0020] A lower distributor is arranged between the tray structure and the third filler layer, and the inlet of the lower distributor extends out of the nicotinic acid tower and is connected to the second temperature control circulation unit.

[0021] In a possible implementation, the second temperature control circulation unit comprises:

[0022] A second collection tank is connected to the second material outlet at the bottom of the lower chamber through a pipeline, and a second delivery pump is arranged in the second collection tank;

[0023] A second heat exchanger has a temperature control channel, and the temperature control channel of the second heat exchanger is connected to the outlet of the second delivery pump and the lower distributor through pipelines respectively.

[0024] In a possible implementation, the cooling unit comprises:

[0025] a third heat exchanger having a heat medium channel, an inlet of the heat medium channel being connected to the top end of the nicotinic acid tower through a pipeline, and an outlet of the heat medium channel being connected to the bottom end of the nicotinic acid tower through a pipeline;

[0026] a third gas distributor arranged at the bottom end of the lower cavity and connected to the pipeline corresponding to the outlet of the heat medium channel.

[0027] In a possible implementation, the bottom of the lower cavity is provided with a first gas distributor connected to the feeding port.

[0028] In the present implementation, the two absorption units arranged in the nicotinic acid tower are arranged from top to bottom, which can ensure sufficient absorption of sulfur trioxide gas. The upper cavity and the lower cavity are separated by a tower plate structure, which can ensure the simultaneous production of oleum with different specifications. The arrangement of the first temperature control circulating unit, the second temperature control circulating unit and the cooling unit can facilitate the discharge of oleum, and also ensure that the temperature in the nicotinic acid tower is controlled and adjusted during the circulation process, thereby ensuring the preparation effect of oleum and having strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 An explosion structure schematic view of the multi-specification oleum preparation system provided by the present application embodiment;

[0030] Figure 2 A tower plate structure schematic view of the multi-specification oleum preparation system provided by the present application embodiment.

[0031] MARK NUMBER EXPLANATION:

[0032] 10, nicotinic acid tower; 11, upper cavity; 12, lower cavity; 13, tower plate structure; 131, bottom plate; 132, fixed pipe; 133, bubble cap; 134, locking piece; 14, absorption liquid inlet; 15, feeding port; 16, upper distributor; 17, first gas distributor;

[0033] 20, first absorption unit; 21, first filler layer; 22, second filler layer; 23, redistribution device;

[0034] 30, second absorption unit; 31, third filler layer; 32, lower distributor;

[0035] 40, first temperature control circulating unit; 41, first collection tank; 42, first heat exchanger; 43, first delivery pump;

[0036] 50, second temperature control circulating unit; 51, second collection tank; 52, second heat exchanger; 53, second delivery pump;

[0037] 60, cooling unit; 61, third heat exchanger; 62, third gas distributor. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only intended to explain the present application and not to limit the present application.

[0039] Please refer to Figure 1 The multi-specification oleum preparation system provided by the present application will be described. The multi-specification oleum preparation system comprises a nicotinic acid tower 10, a first temperature control circulating unit 40, a second temperature control circulating unit 50 and a cooling unit 60. The nicotinic acid tower 10 has a tower cavity, and a tower plate structure 13 is arranged inside the tower cavity. The tower plate structure 13 separates the tower cavity to form an upper cavity 11 and a lower cavity 12. A first absorption unit 20 is arranged in the upper cavity 11, and a second absorption unit 30 is arranged in the lower cavity 12. The nicotinic acid tower 10 is provided with an absorption liquid inlet 14 at the top end for adding concentrated sulfuric acid and communicating with the upper cavity 11, and a feed inlet 15 at the bottom end for adding gas and communicating with the lower cavity 12. The first temperature control circulating unit 40 corresponds to the upper cavity 11 and can collect low-concentration oleum formed by the upper cavity 11. The collected low-concentration oleum is subjected to temperature control and then sent to the first absorption unit 20. The second temperature control circulating unit 50 corresponds to the lower cavity 12 and can collect high-concentration oleum formed by the lower cavity 12. The collected high-concentration oleum is subjected to temperature control and then sent to the second absorption unit 30. The cooling unit 60 is connected to the top end of the nicotinic acid tower 10 and the bottom end of the nicotinic acid tower 10, respectively, and can circulate the gas led out from the top of the tower to the bottom of the tower and cool the gas in the circulation process.

[0040] The working principle of the multi-specification oleum preparation system provided by the present embodiment is that the low-concentration absorption liquid releases heat during the absorption of sulfur trioxide. Most of the heat is stored in the residual sulfur trioxide gas inside the tower cavity. Then, the sulfur trioxide gas gradually heats up during the rising process, and then enters the cooling unit 60 at the top end of the nicotinic acid tower 10 to be cooled to avoid the temperature inside the tower cavity being too high. In addition, the temperature gradually increases during the rising process of the sulfur trioxide gas, which may cause the temperature of the low-concentration oleum collected by the first temperature control circulating unit 40 to be too high. At this time, the first temperature control circulating unit 40 can be used to cool the oleum, and then the oleum is sent to the first absorption unit 20 at the best absorption temperature. The temperature of the high-concentration oleum collected by the second temperature control circulating unit 50 is uncertain. At this time, the second temperature control circulating unit 50 can be used to adjust the temperature of the oleum, and then the oleum is sent to the second absorption unit 30 at the best absorption temperature.

[0041] Compared with the prior art, the two absorption units arranged in the oleum tower 10 from top to bottom can ensure sufficient absorption of sulfur trioxide gas. The upper cavity 11 and the lower cavity 12 are separated by the tray structure 13, which can ensure the production of oleum with different specifications at the same time. The first temperature control circulating unit 40, the second temperature control circulating unit 50, and the cooling unit 60 can facilitate the discharge of oleum and ensure the temperature in the oleum tower 10 during the circulation process, thereby ensuring the preparation effect of oleum and having strong practicability.

[0042] In the embodiment, 21% oleum can be produced in the first temperature control circulating unit 40, and 30% oleum can be produced in the second temperature control circulating unit 50. Of course, other specifications of oleum can also be produced.

[0043] In some embodiments, the above-mentioned oleum tower 10 can adopt the structure as shown in Figure 1 . Referring to Figure 1 , the top of the upper cavity 11 is provided with an upper distributor 16 connected with the absorption liquid inlet 14. The upper distributor 16 can ensure that the entering concentrated sulfuric acid is uniformly distributed to the first absorption unit 20, thereby ensuring the absorption effect. The upper distributor 16 can be a tubular distributor, which has uniform distribution and can adapt to concentrated sulfuric acid with a certain viscosity.

[0044] In some embodiments, the above-mentioned first absorption unit 20 can adopt the structure as shown in Figure 1 . Referring to Figure 1 , the first absorption unit 20 includes a first packing layer 21, a second packing layer 22, and a redistribution device 23. The first packing layer 21 is arranged below the upper distributor 16. The second packing layer 22 is arranged below the first packing layer 21. The redistribution device 23 is arranged between the first packing layer 21 and the second packing layer 22. The inlet of the redistribution device 23 extends out of the oleum tower 10 and is connected with the first temperature control circulating unit 40.

[0045] The first packing layer 21 can correspond to the upper distributor 16, thereby ensuring that the falling concentrated sulfuric acid fully absorbs the rising sulfur trioxide gas and ensuring the absorption effect. The second packing layer 22 simultaneously receives low-concentration oleum from the redistribution device 23 and concentrated sulfuric acid left by the first packing layer 21, which can ensure sufficient absorption of the rising sulfur trioxide and improve the absorption effect.

[0046] In the embodiment, the redistribution device 23 can be a tubular distributor, which can adapt to the viscosity of oleum.

[0047] In some embodiments, the above-mentioned first temperature control circulating unit 40 can adopt the structure as shown in Figure 1 . Referring to Figure 1The first temperature control circulating unit 40 comprises a first collecting tank 41 and a first heat exchanger 42. The first collecting tank 41 is connected to the first material outlet at the bottom of the upper cavity 11 through a pipeline. The first collecting tank 41 is provided with a first conveying pump 43. The first heat exchanger 42 has a temperature control channel, and the temperature control channel of the first heat exchanger 42 is connected to the outlet of the first conveying pump 43 and the redistributor 23 respectively through pipelines.

[0048] The first collecting tank 41 can collect the low-concentration oleum formed on the tray structure 13 and ensure that the oleum is collected when the collection standard is reached. Meanwhile, the first conveying pump 43 arranged in the first collecting tank 41 can also re-convey the oleum to the upper side of the second packing layer 22, so as to circulate and further absorb, thereby continuously increasing the concentration of the oleum. During the circulation, the temperature of the oleum entering the first collecting tank 41 usually increases, and at this time, the first heat exchanger 42 can be used to cool the circulating oleum, so that the oleum can be re-circulated to the upper cavity 11 at a suitable temperature.

[0049] In some embodiments, the second absorption unit 30 described above can adopt the structure as shown in Figure 1 . Referring to Figure 1 , the second absorption unit 30 comprises a third packing layer 31 and a lower distributor 32. The third packing layer 31 is arranged below the tray structure 13 and above the feed inlet 15. The lower distributor 32 is arranged between the tray structure 13 and the third packing layer 31, and the inlet of the lower distributor 32 extends out of the oleum tower 10 and is connected to the second temperature control circulating unit 50.

[0050] The second packing layer 22 can ensure that the high-concentration oleum flowing downward absorbs the rising sulfur trioxide, at this time, most of the sulfur trioxide gas is absorbed. The lower distributor 32 can ensure uniform distribution of the high-concentration oleum, and the lower distributor 32 can be a tubular distributor, which can adapt to the viscosity of the oleum.

[0051] In some embodiments, the second temperature control circulating unit 50 described above can adopt the structure as shown in Figure 1 . Referring to Figure 1 , the second temperature control circulating unit 50 comprises a second collecting tank 51 and a second heat exchanger 52. The second collecting tank 51 is connected to the second material outlet at the bottom of the lower cavity 12 through a pipeline. The second collecting tank 51 is provided with a second conveying pump 53. The second heat exchanger 52 has a temperature control channel, and the temperature control channel of the second heat exchanger 52 is connected to the outlet of the second conveying pump 53 and the lower distributor 32 respectively through pipelines.

[0052] The second collecting tank 51 can ensure the collection of the high-concentration oleum formed at the bottom of the lower cavity 12 and can ensure the extraction when the collection standard is reached. Meanwhile, the second delivery pump 53 arranged in the second collecting tank 51 can also deliver the oleum back to the upper side of the third packing layer 31 to facilitate the circulation and further absorption, so as to continuously increase the concentration of the oleum. During the circulation, the temperature of the oleum entering the second collecting tank 51 will be slightly increased. At this time, the second heat exchanger 52 can be used to cool the circulating oleum, so that the oleum can be recirculated to the lower cavity 12 at a suitable temperature, or the temperature of the high-concentration oleum to be delivered can be increased to a suitable temperature by the second heat exchanger 52 before being recirculated to the lower cavity 12.

[0053] In some embodiments, the above-mentioned cooling unit 60 can adopt the structure as shown in FIG. 6. Referring to FIG. 6, the cooling unit 60 comprises a third heat exchanger 61 and a third gas distributor 62. The third heat exchanger 61 has a heat medium channel, the inlet of the heat medium channel is connected to the top end of the oleum tower 10 through a pipeline, and the outlet of the heat medium channel is connected to the bottom end of the oleum tower 10 through a pipeline. The third gas distributor 62 is arranged at the bottom end of the lower cavity 12 and is connected to the pipeline corresponding to the outlet of the heat medium channel. Figure 1 Figure 1 The third gas distributor 62 can ensure that the sulfur trioxide gas entering the bottom of the lower cavity 12 can be uniformly distributed in the liquid, which can ensure the full absorption of the sulfur trioxide to a certain extent. The third gas distributor 62 can be a tubular distributor.

[0054] The cooling unit 60 arranged can avoid the sulfur trioxide gas staying or accumulating at the top end of the oleum tower 10, and can ensure that the part of the sulfur trioxide is reflowed to the corresponding lower cavity 12 at the bottom of the oleum tower 10 for utilization. The third heat exchanger 61 arranged can ensure the cooling of the part of the sulfur trioxide gas, and thus can ensure that the temperature in the oleum tower 10 is suitable to ensure the absorption effect. The third gas distributor 62 can ensure that the sulfur trioxide gas entering the bottom of the lower cavity 12 can be uniformly distributed in the liquid, which can ensure the full absorption of the sulfur trioxide to a certain extent. The third gas distributor 62 can be a tubular distributor.

[0055] It should be noted that a pump can be arranged on the pipeline connected to the third heat exchanger 61.

[0056] In some embodiments, the above-mentioned oleum tower 10 can adopt the structure as shown in FIG. 5. Referring to FIG. 5, the bottom of the lower cavity 12 is provided with a first gas distributor 17 connected to the feed inlet 15. The first gas distributor 17 can ensure that the sulfur trioxide gas entering the feed inlet 15 can be uniformly distributed in the liquid, which can ensure the full absorption of the sulfur trioxide to a certain extent. The first gas distributor 17 can be a tubular distributor. Figure 1 Figure 1 In some embodiments, the above-mentioned tower plate structure 13 can adopt the structure as shown in FIG. 7. Referring to FIG. 7, the tower plate structure 13 comprises a plurality of tower plates 14 arranged in the lower cavity 12.

[0057] In some embodiments, the above-mentioned tower plate structure 13 can adopt the structure as shown in FIG. 7. Referring to FIG. 7, the tower plate structure 13 comprises a plurality of tower plates 14 arranged in the lower cavity 12. Figure 2 Figure 2 ​​​The tower plate structure 13 can include a bottom plate 131, a fixed cylinder, a bubble cap 133, and a locking piece 134. The bottom plate 131 is horizontally arranged in the tower cavity, and a plurality of through holes are uniformly arranged on the bottom plate 131. The top of each through hole is fixedly connected with a fixed pipe 132. Each fixed pipe 132 is reversely buckled with a bubble cap 133, and the bubble cap 133 is fixed on the fixed pipe 132 through the locking piece 134. The locking piece 134 can be a combination of a bolt and a nut. This structure can ensure that the rising gas is fully in contact with the liquid on the bottom plate 131, thereby further improving the absorption effect.

[0058] Regarding the outlet of the niacin tower 10 connected with the first temperature control circulating unit 40, the height thereof needs to be lower than the height of the top end of the fixed pipe 132, so as to avoid that the liquid in the upper cavity 11 enters into the lower cavity 12.

[0059] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-specification smoking sulfuric acid production system, characterized by, The application relates to a nicotinic acid tower, which comprises a tower cavity, a first absorption unit arranged in the upper cavity, a second absorption unit arranged in the lower cavity, a first temperature control circulating unit corresponding to the upper cavity, a second temperature control circulating unit corresponding to the lower cavity, and a cooling unit connected with the top end and the bottom end of the nicotinic acid tower. The top of the upper cavity is provided with an upper distributor connected with the absorption liquid inlet. The first absorption unit comprises a first filler layer arranged below the upper distributor, a second filler layer arranged below the first filler layer, and a redistribution device arranged between the first filler layer and the second filler layer. The first temperature control circulating unit comprises a first collecting tank connected with a first material outlet at the bottom of the upper cavity through a pipeline, a first conveying pump arranged in the first collecting tank, a first heat exchanger provided with a temperature control channel, and a first gas distributor arranged at the bottom of the upper cavity and connected with the first conveying pump and the first heat exchanger through pipelines. The second absorption unit comprises a third filler layer arranged below the tower plate structure and above the feed inlet, and a lower distributor arranged between the tower plate structure and the third filler layer.

2. The multi-specification smoking sulfuric acid production system of claim 1 wherein, The second temperature control circulating unit comprises a second collecting tank connected with a second material outlet at the bottom of the lower cavity through a pipeline, a second conveying pump arranged in the second collecting tank, a second heat exchanger provided with a temperature control channel, and a second gas distributor arranged at the bottom of the lower cavity and connected with the second conveying pump and the second heat exchanger through pipelines.

3. The multi-specification smoking sulfuric acid production system of claim 2, wherein, The cooling unit comprises a third heat exchanger provided with a heat medium channel, and a third gas distributor arranged at the bottom of the lower cavity and connected with the outlet pipeline of the heat medium channel. The bottom of the lower cavity is provided with a first gas distributor connected with the feed inlet. ​ ​ 4. The multi-specification smoking sulfuric acid production system of claim 3 wherein, ​ ​ ​ 5. The multi-specification smoking sulfuric acid production system of claim 1 wherein, ​ ​ ​ 6. The multi-specification smoking sulfuric acid production system of claim 5 wherein, ​ ​ ​ 7. The multi-specification smoking sulfuric acid production system of claim 1 wherein, ​ ​ ​ 8. The multi-specification smoking sulfuric acid production system of claim 1 wherein, ​

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