Butyl acrylate reaction system with spraying function
By introducing spray function and agitator into the butyl acrylate reaction system, the problems of excessive low-temperature water and reactor corrosion in the catalyst recycling are solved, and efficient resource utilization and production cost are achieved.
Patent Information
- Application Number
- CN202420914196.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-28
AI Technical Summary
During the catalyst recycling process, existing butyl acrylate devices cause a large amount of low-temperature water to enter the reactor, increasing steam consumption, and there are problems of reactor corrosion and butyl acrylate polymerization.
A butyl acrylate reaction system with spraying function was designed. By setting up a spray unit and agitator in the dehydration tower and reactor, the catalyst recycling is realized, reducing the inlet of low-temperature water, reducing steam consumption, and preventing Reactor corrosion and polymerization.
It effectively reduces waste of resources and energy, reduces production costs, avoids reactor corrosion and polymerization of butyl acrylate, and improves the adequacy of the esterification reaction.
Smart Images
Figure CN222469012U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of butyl acrylate preparation, and in particular relates to a butyl acrylate reaction system with a spraying function. Background Art
[0002] Butyl acrylate is an acryloyl compound, a common organic synthesis intermediate, adhesive, emulsifier and coating. The reaction principle of producing butyl acrylate is as follows: the raw materials are n-butanol and acrylic acid, and the catalyst p-toluenesulfonic acid is added, and the reaction is heated to 95-98°C in a negative pressure environment in an esterification kettle to generate butyl acrylate and water. The acrylic acid system includes a reaction system, a water washing system, a refining system, and a heavy component separation system. At present, the recycling of catalysts in the production of butyl acrylate equipment is mainly through the discharge of the aqueous phase at the bottom of the catalyst extraction tower in the water washing system, and the catalyst dissolved in water after washing is returned to the reactor to continue to participate in the reaction. This process will cause a large amount of low-temperature water to enter the reactor, absorb a large amount of heat during the evaporation process, resulting in increased steam consumption. In addition, there are also problems of butyl acrylate polymerization and corrosion of the esterification reactor. Utility Model Content
[0003] The utility model provides a butyl acrylate reaction system with a spraying function, which realizes the recycling of catalysts, reduces the low-temperature water entering the esterification reactor, and reduces steam consumption.
[0004] The technical solution of the utility model is:
[0005] A butyl acrylate reaction system with a spraying function comprises a dehydration tower, a first esterification reactor, and a second esterification reactor connected by pipelines; the dehydration tower is provided with a raw material butanol feed pipeline, a catalyst reflux pipeline, a tower top discharge pipeline, a first evaporator feed pipeline, and a second evaporator feed pipeline; the tower top discharge pipeline is connected to a tower top liquid receiving tank at one end away from the dehydration tower, and a tower top reflux pipeline is further provided between the dehydration tower and the tower top liquid receiving tank; a dehydration tower flushing liquid reflux pipeline is further provided between the dehydration tower and the first esterification reactor; the tower top liquid receiving tank is connected to a water phase outlet pipeline of the liquid receiving tank; The first esterification reactor and the second esterification reactor are connected through the first reactor discharge pipeline; the first esterification reactor is provided with a fresh catalyst feeding pipeline and a raw acrylic acid feeding pipeline; the second esterification reactor is provided with a second reactor discharge pipeline, a feed pump and a cooler are provided on the second reactor discharge pipeline, a reflux pump is provided on the top reflux pipeline, a water discharge pump is provided on the water phase outlet pipeline of the top liquid receiving tank, the first esterification reactor and the second esterification reactor are both provided with an inhibitory air intake pipeline, and the first esterification reactor and the second esterification reactor are both provided with a spray unit.
[0006] Preferably, both the first esterification reactor and the second esterification reactor are horizontal reactors, and a vertical partition is provided in the middle of the first esterification reactor and the second esterification reactor to divide the esterification reactor into reaction zone one and reaction zone two, and the two sides of the partition are connected by a connecting pipe; an agitator is provided in the reaction zone one, and the agitator is rotatably fixed to the top of the first esterification reactor and / or the second esterification reactor to stir the feed liquid in the first esterification reactor and / or the second esterification reactor; a spray unit is provided in at least one position of the upper gas phase space of the reaction zone one or the upper gas phase space of the reaction zone two, and the inlet of the spray unit is connected to the spray pipeline.
[0007] Preferably, the spray unit includes a main pipeline connected to the inlet of the spray unit, the main pipeline is fixed to the inner wall of the first esterification reactor or the second esterification reactor through a fixing frame, a plurality of branch pipelines are arranged at intervals along the length direction on both sides of the main pipeline, and the main pipeline is connected to the branch pipeline, and a plurality of nozzles are arranged on the branch pipeline, and the nozzles are arranged on both sides of the branch pipeline.
[0008] Preferably, the inner walls of the first esterification reactor and the second esterification reactor are both provided with a thermal insulation layer.
[0009] Preferably, the first esterification reactor is further provided with a spoiler block, which is fitted on the inner wall of the first esterification reactor or on the vertical partition plate, and the spoiler block can enhance the stirring effect.
[0010] Preferably, the tower top liquid receiving tank is also connected to a vent air inlet pipeline, and a vent air cooler is provided on the vent air inlet pipeline.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] 1. The utility model is simple to operate and reuses the recovered catalyst in the subsequent water washing device, reducing the waste of resources and the input of raw materials; reducing the low-temperature water entering the esterification reactor, reducing steam consumption, avoiding the waste of resources and energy, and reducing production costs.
[0013] 2. The utility model arranges an agitator in the stirring zone 1 to mix the corrosive medium evenly, thereby avoiding the corrosion problem of the reactor caused by the enrichment of the corrosive medium due to uneven mixing, and also makes the esterification reaction more complete.
[0014] 3. The first esterification reactor and the second esterification reactor of the utility model are both provided with an inhibitor air inlet pipeline and a spray unit, which can spray the gas phase in the reactor to avoid material polymerization caused by insufficient inhibitor dosage in the reactor gas phase space, thereby completely solving the problems of reactor corrosion and polymerization of butyl acrylate. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1It is a structural schematic diagram of the utility model.
[0016] Figure 2 It is a structural schematic diagram of the first esterification reactor of the utility model.
[0017] Figure 3 It is a structural schematic diagram of the second esterification reactor of the utility model.
[0018] Figure 4 It is a structural schematic diagram of the spray unit of the utility model.
[0019] In the figure, 1, dehydration tower; 101, raw material butanol feed pipeline; 103, tower top discharge pipeline; 104, first evaporator feed pipeline; 105, second evaporator feed pipeline; 2, first esterification reactor; 201, raw material acrylic acid feed pipeline; 202, fresh catalyst feed pipeline; 3, second esterification reactor; 4, tower top liquid receiving tank; 401, liquid receiving tank water phase outlet pipeline; 402, water pump; 5, tower top reflux pipeline; 501, reflux pump; 6, dehydration tower flushing liquid reflux pipe line; 7, first reactor discharge line; 8, catalyst reflux line; 9, second reactor discharge line; 901, cooler; 10, inhibitor air inlet line; 11, vertical partition; 12, reaction zone one; 13, reaction zone two; 14, agitator; 15, spray unit; 1501, main pipeline; 1502, branch pipeline; 1503, nozzle; 1504, fixing frame; 16, spoiler; 17, vent air inlet line; 1701, vent air cooler; 18, spray line. DETAILED DESCRIPTION
[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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 described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0021] Example 1
[0022] like Figure 1-4As shown, a butyl acrylate reaction system with a spraying function comprises a dehydration tower 1, a first esterification reactor 2, and a second esterification reactor 3 connected by pipelines; the first esterification reactor 2 and the second esterification reactor 3 are both horizontal reactors, and the inner walls are both provided with a heat preservation layer, and the first esterification reactor 2 and the second esterification reactor 3 are both provided with a spraying unit 15; a vertical partition 11 is provided in the middle of the first esterification reactor 2 and the second esterification reactor 3, and the esterification reactor is divided into a reaction zone 1 12 and a reaction zone 2 13, and the two sides of the partition are connected by a connecting pipe; a stirring unit 15 is provided in the reaction zone 1 A stirrer 14 is provided in the reaction zone 2 of the second esterification reactor 3. The reaction zone 2 13 of the first esterification reactor 2 is stirred by a forced circulation pump. The stirrer 14 is rotatably fixed to the top of the first esterification reactor 2 or the second esterification reactor 3 to stir the liquid in the first esterification reactor 2 and / or the second esterification reactor 3. A spray unit 15 is provided in the upper gas phase space of the reaction zone 12 or the upper gas phase space of the reaction zone 2 13. The inlet of the spray unit 15 is connected to the spray pipeline 18, and the spray liquid comes from the discharge pump of the esterification reactor. The first esterification reactor 2 is also provided with a spoiler block 16, which is fitted on the inner wall of the first esterification reactor 2 or on the vertical partition 11; the spray unit 15 includes a main pipeline 1501 connected to the inlet of the spray unit, and the main pipeline 1501 is fixed to the inner wall of the first esterification reactor 2 or the second esterification reactor 3 through a fixing frame 1504. A plurality of branch pipelines 1502 are arranged at intervals on both sides of the main pipeline 1501 along the length direction, and the main pipeline 1501 is connected to the branch pipeline 1502. A plurality of nozzles 1503 are arranged on the branch pipeline, and the nozzles 1503 are arranged on both sides of the branch pipeline 1502.
[0023] The dehydration tower 1 is provided with a raw material butanol feed pipeline 101, a catalyst reflux pipeline 8, a tower top discharge pipeline 103, a first evaporator feed pipeline 104 and a second evaporator feed pipeline 105. The end of the tower top discharge pipeline 103 away from the dehydration tower 1 is connected to the tower top liquid receiving tank 4, and a tower top reflux pipeline 5 is also provided between the dehydration tower 1 and the tower top liquid receiving tank 4; a dehydration tower flushing liquid reflux pipeline 6 is also provided between the dehydration tower 1 and the first esterification reactor 2; the tower top liquid receiving tank 4 is connected to the liquid receiving tank water phase outlet pipeline 401; the first esterification reactor 2 and the second esterification reactor 3 are connected through the first reactor discharge pipeline 7; The first esterification reactor 2 is provided with a fresh catalyst feeding pipeline 202 and a raw acrylic acid feeding pipeline 201; the second esterification reactor 3 is provided with a second reactor discharge pipeline 9, the second reactor discharge pipeline 9 is provided with a feed pump and a cooler 901, the top reflux pipeline 5 is provided with a reflux pump 501, the top liquid receiving tank water phase outlet pipeline 401 is provided with a water discharge pump 402, the first esterification reactor 2 and the second esterification reactor 3 are both provided with an inhibition air inlet pipeline 10; the top liquid receiving tank is also connected to a vent air inlet pipeline 17, and the vent air inlet pipeline 17 is provided with a vent air cooler 1701.
[0024] The raw material butanol flows into the first esterification reactor 2 through the dehydration tower 1. The raw material acrylic acid and the catalyst are mixed in the pipeline and heated by the heat exchanger. Then, they enter the first esterification reactor 2 and mix with butanol, and then pass through two first esterification reactors 2 and second esterification reactors 3 connected in series. The two reactors are heated by low-pressure steam. The water generated by the reaction and the unreacted butanol are distilled to the dehydration tower 1. The butanol flows to the first esterification reactor 2 through the dehydration tower 1 for recycling until the reaction of converting acrylic acid into butyl acrylate is completed in the second esterification reactor 3. The crude liquid after the reaction enters the subsequent water washing system for purification. In the water washing system, the aqueous phase discharge of the catalyst extraction tower is mixed with the butanol feed pipeline to mix the recovered catalyst with the butanol raw material and enter the dehydration tower 1 for reuse.
[0025] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims
1. A butyl acrylate reaction system with a spraying function, characterized in that: It comprises a dehydration tower (1), a first esterification reactor (2) and a second esterification reactor (3) connected by pipelines; The dehydration tower (1) is provided with a raw material butanol feed pipeline (101), a catalyst reflux pipeline (8), a tower top discharge pipeline (103), a first evaporator feed pipeline (104) and a second evaporator feed pipeline (105); the tower top discharge pipeline (103) is connected to a tower top liquid receiving tank (4) at one end away from the dehydration tower (1); a tower top reflux pipeline (5) is further provided between the dehydration tower (1) and the tower top liquid receiving tank (4); a dehydration tower flushing liquid reflux pipeline (6) is further provided between the dehydration tower (1) and the first esterification reactor (2); the tower top liquid receiving tank (4) is connected to a liquid receiving tank water phase outlet pipeline (401); the first esterification reactor (2) and the second esterification reactor (3) are connected via a first reaction. The first esterification reactor (2) and the second esterification reactor (3) are connected to each other with a discharge pipeline (7); the first esterification reactor (2) is provided with a fresh catalyst feeding pipeline (202) and a raw material acrylic acid feeding pipeline (201); the second esterification reactor (3) is provided with a second reactor discharge pipeline (9), the second reactor discharge pipeline (9) is provided with a feed pump and a cooler (901), the top reflux pipeline (5) is provided with a reflux pump (501), the receiving tank water phase outlet pipeline (401) is provided with a water pump (402), the first esterification reactor (2) and the second esterification reactor (3) are both provided with an inhibitory air intake pipeline (10), and the first esterification reactor (2) and the second esterification reactor (3) are both provided with a spray unit (15).
2. The butyl acrylate reaction system with a spraying function as claimed in claim 1, characterized in that: The first esterification reactor (2) and the second esterification reactor (3) are both horizontal reactors. A vertical partition (11) is provided in the middle of the first esterification reactor (2) and the second esterification reactor (3) to divide the esterification reactor into a reaction zone 1 (12) and a reaction zone 2 (13). Both sides of the partition are connected by a connecting pipe. A stirrer (14) is provided in the reaction zone 1 (12). The stirrer (14) is rotatably fixed to the top of the first esterification reactor (2) and / or the second esterification reactor (3) to stir the feed liquid in the first esterification reactor (2) and / or the second esterification reactor (3). A spray unit (15) is provided at at least one position in the upper gas phase space of the reaction zone 1 (12) or the upper gas phase space of the reaction zone 2 (13). The inlet of the spray unit (15) is connected to a spray pipeline (18).
3. The butyl acrylate reaction system with a spraying function as claimed in claim 2, characterized in that: The spray unit (15) comprises a main pipeline (1501) connected to the inlet of the spray unit, the main pipeline (1501) is fixed to the inner wall of the first esterification reactor (2) or the second esterification reactor (3) through a fixing frame (1504), a plurality of branch pipelines (1502) are arranged at intervals along the length direction on both sides of the main pipeline (1501), and the main pipeline (1501) is connected to the branch pipeline (1502), and a plurality of nozzles (1503) are arranged on the branch pipeline, and the nozzles (1503) are arranged on both sides of the branch pipeline (1502).
4. The butyl acrylate reaction system with a spraying function as claimed in claim 1, characterized in that: The inner walls of the first esterification reactor (2) and the second esterification reactor (3) are both provided with a thermal insulation layer.
5. The butyl acrylate reaction system with a spraying function as claimed in claim 2, characterized in that: The first esterification reactor (2) is further provided with a spoiler block (16), which is arranged in close contact with the inner wall of the first esterification reactor (2) or the vertical partition plate (11).
6. The butyl acrylate reaction system with a spraying function as claimed in claim 1, characterized in that: The tower top liquid receiving tank (4) is also connected to a vent air inlet pipeline (17), and a vent air cooler (1701) is provided on the vent air inlet pipeline (17).