Water absorption tank for material tail gas treatment in p-nitroaniline and o-nitroaniline production
By designing a water absorption tank for production of ortho-nitroaniline, the material exhaust gas is condensed and precipitated in cold water and recovered by steam heating, the problem of material exhaust gas condensation blocking the absorption tower is solved, and material recycling and reuse and cost savings are achieved.
Patent Information
- Application Number
- CN202421782506.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-07-26
AI Technical Summary
During the production process of ortho-nitroaniline, the material exhaust gas is cooled and condensed in the absorption tower filler, resulting in the problem of blocking the absorption tower.
A water absorption tank is designed, and the material exhaust gas enters the tank through the intake pipe, and is cooled in contact with cold water to form solid precipitation, which is melted by steam heating and discharged and recovered.
It effectively solves the problem of material exhaust condensation and blocking absorption tower, purifies material exhaust, realizes material recycling and reuse, and saves costs.
Smart Images
Figure CN222889406U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a p-phenylene recovery and treatment technology, in particular to a water absorption tank for treating tail gas of materials in the production of p- and o-nitroaniline. Background Art
[0002] The downstream products of p-nitroaniline and o-nitroaniline are rich and widely used in medicine, pesticides, light industry and automobile industry. In the production process of p-nitroaniline and o-nitroaniline, some raw materials (including p-nitrochlorobenzene or o-nitrochlorobenzene) will form gas due to high temperature after entering the metering tank. This gas is usually called material tail gas. This part of the material tail gas was previously directly discharged from the exhaust port of the metering tank into the absorption system. The common problem of this method is that the material gas will cool and condense in the packing of the absorption tower, thereby clogging the absorption tower. Now, it is urgent to find an effective solution and related technical equipment to solve this problem. Utility Model Content
[0003] The technical purpose of the utility model is to provide a water absorption tank for treating tail gas of materials in the production of para- and o-nitroaniline. The tail gas of the materials is cooled by water in the absorption tank to form solids and precipitate; then it is melted by steam heating and discharged from the exhaust port for recycling. It solves the problem of clogging the absorption tower in the prior art, purifies the tail gas of the materials, and the materials can be recycled and reused, saving costs.
[0004] The technical scheme of the utility model is as follows: the utility model is a water absorption tank for treating tail gas of materials in the production of para- and o-nitroaniline, which comprises a circular tank body, water is contained in the tank body, a sealing cover is arranged on the tank body, a material tail gas inlet and an exhaust outlet are arranged on the sealing cover, an exhaust pipe is arranged on the exhaust outlet, an air intake pipe extending into the tank body below the liquid level is arranged on the material tail gas inlet, a distributor for uniformly releasing the tail gas of materials is arranged from the part of the air intake pipe extending into the liquid level to the end; a water inlet is arranged at the upper end of the side wall of the tank body, an overflow port is arranged in the middle of the side wall of the tank body, a drain port is arranged at the lower end of the side wall of the tank body, and a transparent visual observation window is arranged at the upper limit position of water addition on the side wall of the tank body; a heater is arranged on the outer wall of the tank body; and a temperature measuring port is arranged at the lower part of the side wall of the tank body.
[0005] Furthermore, the distributor described in the utility model is a pipe wall where the air inlet pipe extends below the liquid surface to the pipe mouth and is evenly spaced with several rows of circular holes, each row is evenly spaced with at least three circular holes along the circumference of the pipe wall, and the lower pipe mouth of the air inlet pipe is provided with a sealed plug.
[0006] Furthermore, the heater arranged on the outer wall of the tank body in the utility model is a hot steam pipe coiled on the outer wall of the tank body, including a steam inlet and a steam outlet.
[0007] Furthermore, the air intake pipe of the utility model is connected to the material tail gas inlet through a check valve. The function of the check valve is to prevent the water in the tank from being sucked back into the metering tank.
[0008] Furthermore, the utility model is provided with hand valves at the water inlet, overflow outlet and drain outlet.
[0009] The beneficial effects of the utility model are as follows: the utility model is an absorption tank which is arranged before the material tail gas enters the tower in the original material tail gas treatment process. Water is added in the tank. The material tail gas enters the tank through the air inlet, contacts the water in the tank through the distributor with dense small holes to cool to form a solid, and then settles to the bottom of the tank. Then the tank body is heated by steam from the outer coil until the solidified material melts, and is discharged and recycled from the exhaust port. The annual recycling volume is 200 kg, saving 1,360 yuan in costs. It completely solves the problem in the prior art that the material tail gas in the absorption tower is cooled and condensed in the absorption tower filler, thereby blocking the absorption tower. The distributor structure designed at the end of the air inlet pipe can fully and quickly make the material tail gas contact the cold water to quickly solidify and reduce the loss of the material tail gas. The remaining gas still enters the absorption tower through the exhaust hole and the exhaust pipe for treatment as in the original process. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 The utility model is a schematic structural diagram of an embodiment of a water absorption tank for treating tail gas of materials in the production of p- and o-nitroaniline.
[0011] Figure 2 It is a structural schematic diagram of the distributor described in an embodiment of a water absorption tank for treating tail gas of materials in the production of p- and o-nitroaniline of the utility model.
[0012] In the figure: 1 tank body, 2 water, 3 tank bottom, 4 air inlet pipe, 4 1 distributor, 411 round hole, 412 plugging, 5 base, a water inlet, b overflow port, c drain port, d steam inlet, e steam outlet, f material tail gas inlet, g exhaust outlet, h transparent visual observation window, i temperature measuring port. DETAILED DESCRIPTION
[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0014] Examination Figure 1-2This is an embodiment of a water absorption tank for treating tail gas of materials in the production of para- and o-nitroaniline of the utility model, which comprises a circular tank body 1, in which water 2 is contained, a sealing cover is provided on the tank body 1, a material tail gas inlet f and an exhaust outlet g are provided on the sealing cover, an exhaust pipe is provided on the exhaust outlet g, an air intake pipe 4 extending below the liquid level in the tank body is provided on the material tail gas inlet f, a distributor 41 for uniformly releasing the tail gas of materials is provided from the part of the air intake pipe 4 extending below the water level to the end thereof; a water inlet a is provided on the upper end of the side wall of the tank body 1, an overflow port b is provided on the middle part of the side wall of the tank body, a drain port c is provided on the lower end of the side wall of the tank body 1 close to the tank bottom 3, a transparent visual observation window h is provided at the upper limit position of water addition on the side wall of the tank body 1; a heater is provided on the outer wall of the tank body 1; a temperature measuring port i is provided on the lower part of the side wall of the tank body. A base 5 is provided on the lower part of the tank body 1. The distributor 41 is a pipe body of the air inlet pipe 4 extending about 100 mm below the liquid surface, and a plurality of rows of circular holes 411 are evenly arranged at intervals. Each row is evenly arranged with at least three circular holes along the circumference of the pipe wall. A sealing plug 412 is provided at the lower pipe opening of the air inlet pipe 1. The diameter of the circular holes is set to about 5 mm, and the spacing between each row of circular holes is about 50 mm.
[0015] The heater arranged on the outer wall of the tank body 1 is a hot steam pipe coiled on the outer wall of the tank body, including a steam inlet d and a steam outlet e. A stop valve is arranged at the steam inlet d, and a steam trap is arranged at the steam outlet e.
[0016] The air inlet pipe is connected to the material tail gas inlet f through a check valve. The function of the check valve is to prevent the water in the tank from being sucked back into the metering tank. Hand valves are provided at the water inlet a, overflow port b, and drain port c.
Claims
1. A water absorption tank for treating tail gas in the production of p- and o-nitroaniline, characterized in that: It includes a circular tank body, in which water is contained, a sealing cover is provided on the tank body, a material tail gas inlet and an exhaust outlet are provided on the sealing cover, an exhaust pipe is provided on the exhaust outlet, an air intake pipe extending into the tank body below the liquid level is provided on the material tail gas inlet, a distributor for uniformly releasing the material tail gas is provided from the part of the air intake pipe extending into the liquid level to the end thereof; a water inlet is provided at the upper end of the side wall of the tank body, an overflow port is provided in the middle of the side wall of the tank body, a drain port is provided at the lower end of the side wall of the tank body, and a transparent visual observation window is provided at the upper limit position of water addition on the side wall of the tank body; a heater is provided on the outer wall of the tank body; and a temperature measuring port is provided at the lower part of the side wall of the tank body.
2. The water absorption tank for treating tail gas of materials in the production of p- and o-nitroaniline according to claim 1, characterized in that: The distributor is a pipe wall where the air inlet pipe extends below the liquid surface to the pipe mouth, and is evenly spaced with several rows of circular holes. Each row is evenly spaced with at least three circular holes along the circumference of the pipe wall. The lower pipe mouth of the air inlet pipe is provided with a sealed plug.
3. The water absorption tank for treating tail gas of materials in the production of p- and o-nitroaniline according to claim 1, characterized in that: The heater arranged on the outer wall of the tank body is a hot steam pipe coiled on the outer wall of the tank body, comprising a steam inlet and a steam outlet.
4. The water absorption tank for treating tail gas of materials in the production of p- and o-nitroaniline according to claim 1, characterized in that: The air intake pipe is connected to the material tail gas inlet through a check valve.
5. The water absorption tank for treating tail gas of materials in the production of p- and o-nitroaniline according to claim 1, characterized in that: Hand valves are arranged at the water inlet, overflow outlet and drain outlet.