Tail gas treatment device for preparing glyoxylic acid from cis-acid

Abstract

The utility model discloses a tail gas treatment device for preparing glyoxylic acid from cis-acid, which comprises an organic acid absorption tower with a tail gas inlet and a discharge port at the bottom, a first gas outlet and a feed port at the top, and a first aeration disc and a stirring mechanism inside; a first gas inlet and a liquid outlet are formed in the bottom of the spraying absorption tower, a second gas outlet and a liquid inlet are formed in the top of the spraying absorption tower, and a second aeration disc, a filler layer and a spraying mechanism are arranged in the spraying absorption tower; a second gas inlet is formed in the bottom of the ozone destroying tower, a third gas outlet is formed in the top, and an ozone destroying layer is arranged in the ozone destroying tower; a third gas inlet is formed in the bottom of the gas buffer tank, and a fourth gas outlet is formed in the top; a fourth gas inlet is formed in the bottom of the oxygen recovery tank, a fifth gas outlet is formed in the top, and an oxygen separation layer and a drying layer are arranged in the oxygen recovery tank. By applying the tail gas treatment device, the problem of resource waste caused by the fact that available components in tail gas cannot be utilized in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to a device for treating tail gas generated by preparing glyoxylic acid, and more particularly to a device for treating tail gas generated by preparing glyoxylic acid from cis-succinic acid. Background Art

[0002] Using cis-1-oxo-2-nitro-4-ol as a raw material and ozone gas as an oxidant to prepare glyoxylic acid through an oxidation reaction can obtain a glyoxylic acid product with a high purity. Therefore, it is a common method for preparing glyoxylic acid. In the process of preparing glyoxylic acid by ozone oxidation of cis-1-oxo-2-nitro-4-ol, ozone generally accounts for only about 10% of the ozone gas used as an oxidant, and oxygen accounts for about 90%. During the oxidation reaction, ozone directly participates in the oxidation reaction, while oxygen does not participate in the reaction. A large amount of carbon dioxide gas is also produced during the oxidation reaction, and during the preparation process, various organic acids in the reaction system will also overflow with the gas. Therefore, the tail gas produced in the reaction of preparing glyoxylic acid includes unreacted ozone, oxygen that does not participate in the reaction, generated carbon dioxide, and overflowed organic acids.

[0003] In the prior art, when treating the tail gas produced by ozone oxidation of maleic acid to prepare glyoxylic acid, the acidic components in the tail gas are usually neutralized and directly discharged into the atmosphere after meeting the emission standards. The usable components in the tail gas cannot be recycled, resulting in a waste of resources. Summary of the invention

[0004] The utility model aims to provide a tail gas treatment device for preparing glyoxylic acid from maleic acid, so as to solve the problem that the prior art cannot utilize the available components in the tail gas and thus causes waste of resources.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A tail gas treatment device for preparing glyoxylic acid from cis-succinic acid, comprising:

[0007] An organic acid absorption tower, wherein a tail gas inlet and a discharge port are provided at the bottom, a first gas outlet and a feed port are provided at the top, a first aeration plate and a stirring mechanism are provided inside the tower, the first aeration plate is located above the tail gas inlet, the stirring mechanism is located above the first aeration plate, and the cis-acid to be used for preparing glyoxylic acid is fed into the organic acid absorption tower from the feed port;

[0008] A spray absorption tower, wherein a first gas inlet and a liquid outlet are arranged at the bottom, a second gas outlet and a liquid inlet for inputting tail gas absorption liquid are arranged at the top, and a second aeration disk, a packing layer and a spray mechanism are arranged in sequence from bottom to top inside, the first gas inlet is connected to the first gas outlet of the organic acid absorption tower, and the spray mechanism is connected to the liquid inlet;

[0009] An ozone destruction tower, having a second gas inlet at its bottom and a third gas outlet at its top, an ozone destruction layer disposed inside thereof, and the second gas inlet is connected to the second gas outlet of the spray absorption tower;

[0010] A gas buffer tank, wherein a third gas inlet is provided at the bottom thereof and a fourth gas outlet is provided at the top thereof, wherein the third gas inlet is connected to the third gas outlet of the ozone destruction tower;

[0011] The oxygen recovery tank has a fourth gas inlet at the bottom and a fifth gas outlet at the top, and an oxygen separation layer and a drying layer are arranged inside from bottom to top. The fourth gas inlet is connected to the fourth gas outlet of the gas buffer tank.

[0012] In some embodiments of the present application, the device further comprises:

[0013] A circulating liquid inlet mechanism is located outside the spray absorption tower and close to the spray absorption tower, and comprises a three-way valve and a circulating pump. The first valve port of the three-way valve is connected to the liquid outlet of the spray absorption tower, the second valve port of the three-way valve is connected to the liquid inlet of the spray absorption tower via the circulating pump and a pipeline, and the third valve port of the three-way valve is connected to a drain pipe.

[0014] In some embodiments of the present application, the spray mechanism includes:

[0015] A primary spray sub-mechanism, which is close to the liquid inlet and includes a spray head, and the spray head is connected to the liquid inlet;

[0016] The secondary spray sub-mechanism is located below the primary spray sub-mechanism and comprises a liquid collecting box with a plurality of nozzles formed at the bottom thereof.

[0017] In some embodiments of the present application, the packing layer is a ball ring packing layer.

[0018] In some embodiments of the present application, the ozone depletion layer includes a plurality of activated carbon layers sequentially spaced from top to bottom.

[0019] In some embodiments of the present application, a window is also provided on the organic acid absorption tower.

[0020] Compared with the prior art, the advantages and positive effects of the utility model are:

[0021] The utility model provides a tail gas treatment device for preparing glyoxylic acid from cis-acid, which is provided with an organic acid absorption tower, a spray absorption tower, an ozone destruction tower and a gas buffer tank which are connected in sequence. The tail gas to be treated passes through the organic acid absorption tower, and the cis-acid solution in the tower is used to absorb the unreacted and generated organic acid gas in the tail gas. The absorbed organic acid gas and the cis-acid solution in the tower are used as raw materials for oxidation reaction to enter the equipment for preparing glyoxylic acid, thereby realizing the recovery and reuse of the organic acid gas in the tail gas; the tail gas enters the spray absorption tower from the organic acid absorption tower, and the tail gas absorption liquid is used to absorb the carbon dioxide in the tail gas and the organic acid not absorbed by the organic acid absorption tower; the tail gas enters the ozone destruction tower from the spray absorption tower, and the ozone structure is destroyed by the ozone destruction layer, and the ozone is decomposed into oxygen, thereby realizing the recovery of the ozone in the tail gas; the tail gas enters the oxygen recovery tank through the gas buffer tank, and the oxygen is separated by the oxygen separation layer. The separated oxygen is dried by the drying layer to obtain clean oxygen, which can be input into the ozone generator to prepare ozone, thereby realizing the recovery and reuse of the oxygen in the tail gas. Therefore, by utilizing the tail gas treatment device of the utility model, the organic acid, ozone and oxygen in the tail gas can be recovered and reused, thereby improving the resource utilization rate.

[0022] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief introduction will be given below to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 The utility model is a schematic structural diagram of an embodiment of a tail gas treatment device for preparing glyoxylic acid from maleic acid.

[0025] In the above drawings, the reference numerals and their corresponding component names are as follows:

[0026] 1. Organic acid absorption tower; 11. Tail gas inlet; 12. First gas outlet; 13. Feed inlet; 14. Discharge outlet; 15. First aeration plate; 16. Stirring mechanism; 17. Window;

[0027] 2. Spray absorption tower; 21. First gas inlet; 22. Second gas outlet; 23. Liquid inlet; 24. Liquid outlet; 25. Second aeration plate; 26. Packing layer; 27. Spray mechanism; 271. Spray head; 272. Liquid collecting box; 273. Nozzle;

[0028] 3. Ozone destruction tower; 31. Second gas inlet; 32. Third gas outlet; 33. Ozone destruction layer;

[0029] 4. Gas buffer tank; 41. Third gas inlet; 42. Fourth gas outlet;

[0030] 5. Oxygen recovery tank; 51. Fourth gas inlet; 52. Fifth gas outlet; 53. Oxygen separation layer; 54. Drying layer;

[0031] 6. Circulating liquid inlet mechanism; 61. Three-way valve; 62. Circulating pump; 63. Liquid discharge pipe. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0034] In the present invention, unless otherwise clearly defined and specified, the term "connection" and the like should be understood in a broad sense, and may refer to mechanical connection or electrical connection; may refer to direct connection or indirect connection through an intermediate medium; may refer to the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the terms "first", "second", "third", "fourth", and "fifth" are used for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", "fourth", and "fifth" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Figure 1 The figure shows a schematic structural diagram of an embodiment of a tail gas treatment device for preparing glyoxylic acid from maleic acid according to the utility model.

[0038] like Figure 1 As shown, the tail gas treatment device of this embodiment includes an organic acid absorption tower 1, a spray absorption tower 2, an ozone destruction tower 3, a gas buffer tank 4 and an oxygen recovery tank 5 which are connected in sequence.

[0039] The organic acid absorption tower 1 is provided with a tail gas inlet 11 at the bottom, a first gas outlet 12 at the top, a first aeration plate 15 and a stirring mechanism 16 inside, the first aeration plate 15 is located above the tail gas inlet 11, and the stirring mechanism 16 is located above the first aeration plate 15. The organic acid absorption tower 1 is also provided with a feed port 13 at the top, and a discharge port 14 at the bottom. Maleic acid to be used for preparing glyoxylic acid is fed into the organic acid absorption tower 1 from the feed port 13, and is fully contacted with the tail gas entering the organic acid absorption tower 1 from the tail gas inlet 11 under the stirring of the stirring mechanism 16. After the maleic acid in the organic acid absorption tower 1 is discharged from the discharge port 14, it enters the glyoxylic acid preparation equipment as one of the raw materials to prepare glyoxylic acid.

[0040] In some other embodiments, a viewing window 17 is further provided on the organic acid absorption tower 1 to facilitate operators to observe the status inside the tower through the viewing window 17 .

[0041] The spray absorber 2 is provided with a first gas inlet 21 at the bottom and a second gas outlet 22 at the top. The first gas inlet 21 is connected to the first gas outlet 12 of the organic acid absorber 1. The spray absorber 2 is also provided with a liquid inlet 23 at the top and a liquid outlet 24 at the bottom. The spray absorber 2 is provided with a second aeration plate 25, a packing layer 26 and a spray mechanism 27 from bottom to top. The second aeration plate 25 is located above the first gas inlet 21, and the spray mechanism 27 is connected to the liquid inlet 23. The tail gas absorption liquid enters the spray mechanism 27 from the liquid inlet 23 for spraying. The sprayed absorption liquid passes through the packing layer 26 and contacts with the tail gas exposed through the first gas inlet 21 and the second aeration plate 25, and finally flows out of the spray absorber 2 through the liquid outlet 24. In some embodiments, the packing layer 26 is a ball ring packing layer to increase the contact area between the gas and the liquid and improve the efficiency of absorbing the tail gas.

[0042] The ozone destruction tower 3 is provided with a second gas inlet 31 at the bottom, a third gas outlet 32 ​​at the top, an ozone destruction layer 33 is provided inside, and the second gas inlet 31 is connected to the second gas outlet 22 of the spray absorption tower 2. In some embodiments, the ozone destruction layer 33 includes a plurality of activated carbon layers arranged in sequence from top to bottom, and the ozone destruction layer is formed by arranging multiple layers of activated carbon layers to improve the efficiency of ozone destruction.

[0043] A third gas inlet 41 is disposed at the bottom of the gas buffer tank 4 , and a fourth gas outlet 42 is disposed at the top thereof. The third gas inlet 41 is communicated with the third gas outlet 32 ​​of the ozone destruction tower 3 .

[0044] The oxygen recovery tank 5 is provided with a fourth gas inlet 51 at the bottom, a fifth gas outlet 52 at the top, an oxygen separation layer 53 and a drying layer 54 are provided inside from bottom to top, and the fourth gas inlet 51 is connected to the fourth gas outlet 42 of the gas buffer tank 4. In some embodiments, the oxygen separation layer 53 uses a molecular sieve to separate oxygen and carbon dioxide gas.

[0045] For the exhaust gas treatment device having the above structure, the exhaust gas treatment process is described as follows.

[0046] The tail gas generated in the process of preparing glyoxylic acid by oxidation reaction of cis-acid and ozone enters the organic acid absorption tower 1 through the tail gas inlet 11, and is exposed upward through the first aeration plate 15. The organic acid absorption tower 1 contains cis-acid fed through the feed port 13. Under the stirring of the stirring mechanism 16, the exposed gas is fully contacted and mixed with the cis-acid solution, and the cis-acid solution absorbs the unreacted and generated organic acid gases in the tail gas, such as cis-acid, glyoxylic acid, formic acid, etc. The absorbed organic acid gas and the cis-acid solution in the tower flow out from the discharge port 14, and enter the equipment for preparing glyoxylic acid as the raw materials for the oxidation reaction to prepare glyoxylic acid, thereby realizing the recovery and reuse of the organic acid gas in the tail gas.

[0047] The tail gas from which part of the organic acid gas is removed enters the spray absorber 2 from the first gas outlet 12 of the organic acid absorber 1 and the first gas inlet 21 of the spray absorber 2, and then passes through the second aeration plate 25. The tail gas absorption liquid is generally an alkaline solution, which enters the spray mechanism 27 from the liquid inlet 23 for spraying. The sprayed absorption liquid passes through the packing layer 26 and contacts the tail gas exposed by the second aeration plate 25, absorbing part of the carbon dioxide in the tail gas and the organic acid gas not absorbed by the organic acid absorber 1. The tail gas absorption liquid after absorbing the tail gas flows out of the spray absorber 2 from the liquid outlet 24.

[0048] The tail gas after the organic acid gas and part of the carbon dioxide are removed enters the ozone destruction tower 3 from the second gas outlet 22 of the spray absorption tower 2 and the second gas inlet 31 of the ozone destruction tower 3, and the ozone destruction layer 33 in the ozone destruction tower 3 is used to destroy the ozone structure and decompose the ozone into oxygen, thereby realizing the recovery of ozone in the tail gas.

[0049] Most of the tail gas treated by the ozone destruction tower 3 is oxygen, and there is a small part of carbon dioxide. The tail gas enters the gas buffer tank 4 from the third gas outlet 32 ​​of the ozone destruction tower 3 and the third gas inlet 41 of the gas buffer tank 4 for buffering to avoid impact on the subsequent oxygen recovery and utilization system.

[0050] The tail gas buffered by the gas buffer tank 4 enters the oxygen recovery tank 5 from the fourth gas outlet 42 of the gas buffer tank 4 and the fourth gas inlet 51 of the oxygen recovery tank 5. The oxygen separation layer 53 in the oxygen recovery tank 5 separates oxygen from the tail gas. The separated oxygen is dried by the drying layer 54 to obtain clean oxygen, which is then output from the fifth gas outlet 52. The output oxygen can be input to the ozone generator to prepare ozone, thereby realizing the recovery and reuse of oxygen in the tail gas.

[0051] Therefore, by using the tail gas treatment device of this embodiment, the recyclable components such as organic acid, ozone and oxygen in the tail gas can be recovered and reused, thereby improving resource utilization.

[0052] In some other embodiments, the spray mechanism 27 includes an upper and lower spray sub-mechanism. The upper first-stage spray sub-mechanism is close to the liquid inlet 23 and includes a spray head 271, which is connected to the liquid inlet 23. The second-stage spray sub-mechanism is located below the first-stage spray sub-mechanism, and the second-stage spray sub-mechanism includes a liquid collecting box 272, and a plurality of nozzles 273 are formed at the bottom of the liquid collecting box 272. By setting the spray mechanism 27 as an upper and lower two-stage spray sub-mechanism, the first-stage spray sub-mechanism is used to facilitate communication with the liquid inlet 23 and buffer the spray pressure, and the second-stage spray sub-mechanism can be used to increase the spray area, reduce the spray speed, improve the mixing effect of the exhaust gas absorption liquid and the exhaust gas, and improve the exhaust gas treatment efficiency.

[0053] In some other embodiments, the tail gas treatment device further includes a circulating liquid inlet mechanism 6, which is located outside the spray absorption tower 2 and close to the spray absorption tower 2. The circulating liquid inlet mechanism 6 includes a three-way valve 61 and a circulating pump 62. The first valve port of the three-way valve 61 is connected to the liquid outlet 24 of the spray absorption tower 2, and the second valve port of the three-way valve 61 is connected to the liquid inlet 23 of the spray absorption tower 2 through the circulating pump 62 and the pipeline. The third valve port of the three-way valve 61 is connected to the drain pipe 63. The tail gas absorption liquid flowing out of the liquid outlet 24 can be returned to the liquid inlet 23 through the three-way valve 61, the circulating pump 62 and the pipeline, so as to realize the recycling of the tail gas absorption liquid and improve the resource utilization rate. The excess tail gas absorption liquid in the spray absorption tower 2 or the tail gas absorption liquid that is not suitable for recycling can be discharged through the three-way valve 61 and the drain pipe 63.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A tail gas treatment device for preparing glyoxylic acid from cis-1-1-1 acid, characterized in that: include: An organic acid absorption tower, wherein a tail gas inlet and a discharge port are provided at the bottom, a first gas outlet and a feed port are provided at the top, a first aeration plate and a stirring mechanism are provided inside the tower, the first aeration plate is located above the tail gas inlet, the stirring mechanism is located above the first aeration plate, and the cis-acid to be used for preparing glyoxylic acid is fed into the organic acid absorption tower from the feed port; A spray absorption tower, wherein a first gas inlet and a liquid outlet are arranged at the bottom, a second gas outlet and a liquid inlet for inputting tail gas absorption liquid are arranged at the top, and a second aeration disk, a packing layer and a spray mechanism are arranged in sequence from bottom to top inside, the first gas inlet is connected to the first gas outlet of the organic acid absorption tower, and the spray mechanism is connected to the liquid inlet; An ozone destruction tower, having a second gas inlet at its bottom and a third gas outlet at its top, an ozone destruction layer disposed inside thereof, and the second gas inlet is connected to the second gas outlet of the spray absorption tower; A gas buffer tank, wherein a third gas inlet is provided at the bottom thereof and a fourth gas outlet is provided at the top thereof, wherein the third gas inlet is connected to the third gas outlet of the ozone destruction tower; The oxygen recovery tank has a fourth gas inlet at the bottom and a fifth gas outlet at the top, and an oxygen separation layer and a drying layer are arranged inside from bottom to top. The fourth gas inlet is connected to the fourth gas outlet of the gas buffer tank.

2. The tail gas treatment device for preparing glyoxylic acid from cis-1-hydroxy-2-nitrogen according to claim 1, characterized in that: The device also includes: A circulating liquid inlet mechanism is located outside the spray absorption tower and close to the spray absorption tower, and comprises a three-way valve and a circulating pump. The first valve port of the three-way valve is connected to the liquid outlet of the spray absorption tower, the second valve port of the three-way valve is connected to the liquid inlet of the spray absorption tower via the circulating pump and a pipeline, and the third valve port of the three-way valve is connected to a drain pipe.

3. The tail gas treatment device for preparing glyoxylic acid from cis-1-hydroxy-2-nitrogen according to claim 1, characterized in that: The spray mechanism comprises: A primary spray sub-mechanism, which is close to the liquid inlet and includes a spray head, and the spray head is connected to the liquid inlet; The secondary spray sub-mechanism is located below the primary spray sub-mechanism and comprises a liquid collecting box with a plurality of nozzles formed at the bottom thereof.

4. The tail gas treatment device for preparing glyoxylic acid from cis-1-hydroxy-2-nitrogen according to claim 1, characterized in that: The packing layer is a ball ring packing layer.

5. The tail gas treatment device for preparing glyoxylic acid from cis-1-hydroxy-2-nitropropene according to claim 1, characterized in that: The ozone depletion layer includes a plurality of activated carbon layers which are sequentially arranged from top to bottom.

6. The tail gas treatment device for preparing glyoxylic acid from cis-1-hydroxy-2-nitrogen according to claim 1, characterized in that: The organic acid absorption tower is also provided with a viewing window.

Images