Acetaldehyde absorption device

Abstract

The utility model discloses an acetaldehyde absorption device, which comprises a venturi absorber, a separator and a tower type absorption device, the feed end of the venturi absorber is respectively connected into a reactor and a water tank, the discharge end of the venturi absorber is connected with the feed end of the separator, and the tower type absorption device is connected with the discharge end of the separator. A discharging end at the top of the separator is connected with a feeding end at the bottom end of the tower type absorption device. Through multi-stage absorption, the acetaldehyde reaction gas absorption effect is improved, the problems that the absorption tower is easy to block and the filler is easy to replace are solved, the acetaldehyde absorption rate is improved, and meanwhile, the problem of workshop odor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pharmaceutical intermediate synthesis, in particular to an acetaldehyde absorption device. Background Art

[0002] Regarding acetaldehyde absorption, the integrated acetaldehyde absorption tower device disclosed in announcement number CN207187444U overcomes the defects of the existing acetaldehyde absorption tower device, such as the large number of equipment, complex process flow, large number of circulation pumps, high power consumption, and poor absorption effect. The tower body includes at least two absorption sections, each of which includes a perforated plate filler and a liquid distributor arranged above the perforated plate filler. The concentration of dilute acetaldehyde is increased to 12-14%, which solves the problems of the large number of circulation pumps and high power consumption of the product. However, it does not solve the problem of easy clogging of the packed tower and the difficulty of replacement.

[0003] In addition, announcement number CN202096868U discloses a new type of liquid distributor that improves acetaldehyde absorption efficiency. The distributor comprises a closed system consisting of a water inlet pipe, a shell, an upper cover, and a base plate. An overflow pipe and an air lift are mounted on the base plate, with the bottom end of the air lift extending out of the base plate. An overflow groove is circumferentially opened on the upper portion of the overflow pipe, a water sprinkling hole is drilled in the bottom of the overflow pipe, two water inlet pipes are arranged symmetrically, and an inspection handhole is provided in the center of the upper cover. This avoids the tedious work of heat-insulating the water distribution pipes, facilitates the control and metering of the spray water during normal production, conserves water resources and steam, reduces maintenance workload, and lowers maintenance costs. It also improves the acetaldehyde absorption rate, reduces the burden on subsequent work sections, and saves production costs. However, it does not solve problems such as clogging of the packing tower and the difficulty of replacement. Utility Model Content

[0004] The purpose of the utility model is to provide an acetaldehyde absorption device, which can gradually improve the absorption effect by setting a three-step absorption structure, thereby solving the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An acetaldehyde absorption device comprises a venturi absorber, a separator and a tower absorption device, wherein the feed end of the venturi absorber is respectively connected to a reactor and a water tank, the discharge end of the venturi absorber is connected to the feed end of the separator, and the discharge end at the top of the separator is connected to the feed end at the bottom of the tower absorption device.

[0007] Furthermore, the Venturi absorber includes an air inlet pipe, a contraction pipe, a nozzle, a throat pipe, an extension pipe and a connecting pipe. A nozzle is arranged between the throat pipe and the contraction pipe. One end of the contraction pipe is connected to the air inlet pipe, one end of the throat pipe is connected to the extension pipe, and the extension pipe is connected to the separator through the connecting pipe.

[0008] Furthermore, the nozzle is connected to the water tank via a first water pump.

[0009] Furthermore, the tower absorption device includes a tower body, a gas distributor, a falling film absorption section, a cyclone absorption section and a dehydration layer, and the gas distributor, the falling film absorption section, the cyclone absorption section and the dehydration layer are arranged on the tower body from bottom to top.

[0010] Furthermore, the falling film absorption section includes a falling film absorption tube and a liquid distributor, and the falling film absorption tube is arranged at the bottom liquid outlet of the liquid distributor.

[0011] Furthermore, the swirl absorption section includes a spray pipe, a spray shower and a swirl plate. The water inlet end of the spray pipe is connected to the water tank through a second water pump. The spray pipe has three branches, which are distributed from top to bottom and are all connected to the spray shower. A swirl plate is provided under the spray shower.

[0012] Furthermore, the swirl plate is composed of a middle blind plate and 24 fixed windmill blade-shaped swirl blades arranged around it.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The utility model sets a nozzle between the throat and the contraction tube of the venturi absorber, so that the reaction gas starts to spray at high speed at the air inlet, performs the first spraying, and improves the absorption effect. The reaction gas enters the tower absorption device and is evenly distributed by the gas distributor before entering the falling film absorption section for the second absorption. Then, it passes through the three-layer spray shower and swirl plate combination arranged from top to bottom, and performs the third step of rotation dispersion and spray absorption on the acetaldehyde reaction gas. The utility model improves the absorption effect of the acetaldehyde reaction gas through multi-stage absorption, solves the problems of easy clogging of the absorption tower and replacement of fillers, improves the acetaldehyde absorption rate, and solves the problem of workshop odor at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the acetaldehyde absorption device of the utility model;

[0016] Figure 2 This is a schematic structural diagram of the Venturi absorber of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the tower absorption device of the utility model.

[0018] In the figure: 1. Venturi absorber; 2. separator; 3. tower absorption device; 4. water tank; 5. storage tank; 101. air inlet pipe; 102. contraction pipe; 103. nozzle; 104. throat; 105. expansion pipe; 106. connecting pipe; 301. tower body; 302. gas distributor; 303. falling film absorption section; 304. cyclone absorption section; 305. dehydration layer; 3031. falling film absorption pipe; 3032. liquid distributor; 3041. spray pipe; 3042. spray shower; 3043. cyclone plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Please refer to Figure 1 An acetaldehyde absorption device includes a venturi absorber 1, a separator 2 and a tower absorption device 3. The feed end of the venturi absorber 1 is connected to the reactor and the water tank 4 respectively. The reactor provides reaction gas to the venturi absorber 1, and the water tank 4 provides water to the venturi absorber 1. The discharge end of the venturi absorber 1 is connected to the feed end of the separator 2, and the discharge end at the top of the separator 2 is connected to the feed end at the bottom of the tower absorption device 3.

[0021] Please refer to Figure 2 The venturi absorber 1 includes an inlet pipe 101, a contraction pipe 102, a nozzle 103, a throat pipe 104, an extension pipe 105, and a connecting pipe 106. One end of the contraction pipe 102 is connected to the inlet pipe 101, and the reaction gas enters the throat pipe 104 from the inlet pipe 101. One end of the throat pipe 104 is connected to the extension pipe 105, and the extension pipe 105 is connected to the separator 2 through the connecting pipe 106. The extension pipe 105 transports the absorbed liquid and gas to the connecting pipe 106, and then enters the separator 2. The liquid separated by the separator 2 enters the storage tank 5, and the liquid stored in the storage tank 5 is sent to the purification section.

[0022] In order to increase the absorption effect, a nozzle 103 is set between the throat 104 and the contraction tube 102. The nozzle 103 is a high-speed anti-blocking nozzle. The contraction tube 102 is trumpet-shaped, which is convenient for collecting the reaction gas (acetaldehyde reaction gas) at the nozzle 103. The nozzle 103 is connected to the water tank 4 through the first water pump. The water in the water tank 4 is pumped to the nozzle 103 through the first water pump. The water is sprayed out at high speed through the nozzle 103 to cool the reaction gas and absorb it. Through the setting of the nozzle 103, the first step of absorption is carried out.

[0023] Please refer to Figure 1 and Figure 3 The tower absorption device 3 includes a tower body 301, a gas distributor 302, a falling film absorption section 303, a cyclone absorption section 304 and a dehydration layer 305. The gas distributor 302, the falling film absorption section 303, the cyclone absorption section 304 and the dehydration layer 305 are arranged on the tower body 301 from bottom to top. The gas coming out of the separator 2 is distributed by the gas distributor 302 and then enters the falling film absorption section 303 upward, and then enters the cyclone absorption section 304 for absorption. After dehydration in the dehydration layer 305 (which is a conventional gas dehydration technology, so it is not described in detail), the tail gas is absorbed.

[0024] The falling film absorption section 303 includes a falling film absorption pipe 3031 and a liquid distributor 3032. The falling film absorption pipe 3031 is arranged at the bottom liquid outlet of the liquid distributor 3032. The gas is mixed with the liquid distributed by the liquid distributor 3032 in the falling film absorption pipe 3031 and further absorbed.

[0025] Specifically, the swirl absorption section 304 includes a spray pipe 3041, a spray shower 3042 and a swirl plate 3043. The water inlet end of the spray pipe 3041 is connected to the water tank 4 through a second water pump. The second water pump pumps water from the water tank 4 to the spray pipe 3041. The spray pipe 3041 has three branches, which are distributed from top to bottom and are all connected to the spray shower 3042. A swirl plate 3043 is set below the spray shower 3042. Each spray shower 3042 and swirl plate 3043 form a group. Three groups are arranged from top to bottom. The gas continues to rise, and the rotating swirl plate 3043 forms a rotating airflow, which can evenly raise the gas to the spraying area. The spray shower 3042 sprays the gas, and the liquid flows downward along the blades of the swirl plate. During the high-speed rotation, the absorption of the gas is accelerated. The utility model combines the spray shower 3042 and the swirl plate 3043 together. The swirl plate 3043 rotates at high speed to disperse the gas and then spray it, which greatly improves the absorption effect.

[0026] The swirl plate 3043 is composed of a middle blind plate and 24 fixed windmill blade-shaped swirl blades arranged around it. The swirl plate 3043 is a prior art and will not be described in detail here.

[0027] Working principle: The acetaldehyde reaction gas coming out of the reactor enters the Venturi absorber 1 through the air inlet pipe 101. At the same time, the first water pump pumps water into the nozzle 103 for absorption. The absorbed liquid and gas enter the rear-end separator 2 for gas-liquid separation. The liquid goes to the storage tank 5 and then to the purification section; the gas goes to the tower absorption device 3, and the gas at the bottom of the tower passes through the gas distributor 302 and enters the falling film absorption section 303, and then enters the cyclone absorption section 304 for absorption. At the same time, water is pumped into the spray shower 3042 by the second water pump and enters the cyclone absorption section 304, and then enters the falling film absorption section 303 to absorb the reaction gas. The absorbed liquid at the bottom of the tower goes to the purification section.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An acetaldehyde absorption device, comprising a venturi absorber (1), a separator (2) and a tower absorption device (3), characterized in that: The feed end of the venturi absorber (1) is connected to the reactor and the water tank (4) respectively, the discharge end of the venturi absorber (1) is connected to the feed end of the separator (2), and the discharge end at the top of the separator (2) is connected to the feed end at the bottom of the tower absorption device (3).

2. The acetaldehyde absorption device according to claim 1, characterized in that The venturi absorber (1) comprises an air inlet pipe (101), a contraction pipe (102), a nozzle (103), a throat pipe (104), an extension pipe (105) and a connecting pipe (106); a nozzle (103) is provided between the throat pipe (104) and the contraction pipe (102); one end of the contraction pipe (102) is connected to the air inlet pipe (101); one end of the throat pipe (104) is connected to the extension pipe (105); and the extension pipe (105) is connected to the separator (2) via the connecting pipe (106).

3. The acetaldehyde absorption device according to claim 2, characterized in that: The nozzle (103) is connected to the water tank (4) via a first water pump.

4. The acetaldehyde absorption device according to claim 1, characterized in that The tower absorption device (3) comprises a tower body (301), a gas distributor (302), a falling film absorption section (303), a cyclone absorption section (304) and a dehydration layer (305), wherein the gas distributor (302), the falling film absorption section (303), the cyclone absorption section (304) and the dehydration layer (305) are arranged on the tower body (301) from bottom to top.

5. The acetaldehyde absorption device according to claim 4, characterized in that: The falling film absorption section (303) comprises a falling film absorption pipe (3031) and a liquid distributor (3032), and the falling film absorption pipe (3031) is arranged at the bottom liquid outlet of the liquid distributor (3032).

6. The acetaldehyde absorption device according to claim 4, characterized in that: The swirl absorption section (304) comprises a spray pipe (3041), a spray shower (3042) and a swirl plate (3043); the water inlet end of the spray pipe (3041) is connected to the water tank (4) via a second water pump; the spray pipe (3041) has three branches, which are distributed from top to bottom and are all connected to the spray shower (3042); and a swirl plate (3043) is provided below each of the spray showers (3042).

7. The acetaldehyde absorption device according to claim 6, characterized in that: The swirl plate (3043) is composed of a middle blind plate and 24 fixed windmill blade-shaped swirl blades arranged around it.

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