BE acid preparation device
By introducing condenser groups and settling tanks into the BE acid preparation unit, the problem of raw material evaporation under high temperature conditions was solved, and the recovery and cleaning of raw materials were realized, reducing costs and improving production efficiency.
Patent Information
- Application Number
- CN202423236846.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-27
AI Technical Summary
During the production of BE acid, the high-temperature environment causes raw materials such as ethylbenzene and chlorobenzene to easily form vapors that overflow, resulting in waste of raw materials.
A BE acid preparation device was designed, including a condenser group, an insulated kettle, a settling tank, and a buffer tank. The condenser group treats the tail gas generated by the hydrolysis kettle, recovers the high-temperature evaporated ethylbenzene and chlorobenzene, and separates the recovered liquid in the separation tank. The insulated kettle and settling tank are combined to prevent pipeline blockage, and a chlorobenzene cleaning device is used to clean the residual raw materials.
It effectively reduced raw material waste, lowered production costs, improved the efficiency of the acylation reactor, and achieved efficient recovery and cleaning of raw materials.
Smart Images
Figure CN223717097U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model is suitable for chemical technology field, provide a kind of BE acid preparation device. BACKGROUND
[0002] BE acid is also called 2- (4'-ethylbenzoyl) benzoic acid, which is synthesized from ethylbenzene and phthalic anhydride under the catalysis of aluminum chloride. It is a raw material for the synthesis of 2-ethylanthraquinone.
[0003] However, the production environment of BE acid is a high-temperature environment, which makes it easy for raw materials such as ethylbenzene and phthalic anhydride to form steam overflow, leading to the problem of raw material waste.
[0004] Therefore, we need to improve the existing production process of BE acid. INVENTION CONTENTS
[0005] In view of the above defects, the utility model aims to provide a kind of BE acid preparation device, the purpose is to solve the problem in the background.
[0006] A kind of BE acid preparation device, including chlorobenzene cleaning high tank, ethylbenzene storage tank, feeding bin and acylation reaction kettle, the chlorobenzene cleaning high tank, ethylbenzene storage tank and feeding bin are all connected with acylation reaction kettle pipeline, still include hydrolysis kettle and condenser group, the acylation reaction kettle is connected with hydrolysis kettle pipeline, the hydrolysis kettle is connected with condenser group pipeline.
[0007] Among them, the condenser group includes several series of condensation refluxers.
[0008] Among them, the condensation refluxer is not less than three, and the condensation refluxer is a round block type graphite absorber.
[0009] Among them, it further includes a separation tank, which is connected with the hydrolysis kettle pipeline and the condenser group pipeline.
[0010] Among them, an insulation kettle is arranged between the acylation reaction kettle and the hydrolysis kettle, and the acylation reaction kettle and the hydrolysis kettle are connected with the insulation kettle pipeline.
[0011] Among them, the insulation kettle is further connected with a rotating plate heat exchanger.
[0012] Among them, an acylation liquid settling tank is arranged between the insulation kettle and the hydrolysis kettle, and the insulation kettle and the hydrolysis kettle are connected with the acylation liquid settling tank pipeline.
[0013] Among them, the acylation liquid settling tank is further connected with an acylation liquid buffer tank, an acylation liquid conveying pump is arranged between the acylation liquid buffer tank and the hydrolysis kettle, and an acylation liquid deslagging pipeline is arranged between the acylation liquid settling tank and the hydrolysis kettle.
[0014] The chlorobenzene flushing pipeline is arranged between the heat preservation kettle, the acylation liquid settling tank and the acylation liquid buffer tank and the chlorobenzene cleaning high tank.
[0015] The ethylbenzene intermediate tank is connected with the ethylbenzene storage tank through a pipeline, and an ethylbenzene conveying pump is arranged between the ethylbenzene intermediate tank and the ethylbenzene storage tank.
[0016] Beneficial effects
[0017] The tail gas generated in the hydrolysis kettle is sent to the condenser group for condensation treatment, so that the reaction raw materials such as ethylbenzene and chlorobenzene evaporated due to high temperature are condensed and recovered, and the design reduces the cost and avoids raw material waste. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a structure diagram of the BE acid preparation device;
[0019] Figure 2 It is a structure diagram of the condenser group;
[0020] Figure 3 It is a structure diagram of the acylation liquid settling tank;
[0021] Figure 4 It is a pipeline diagram of the BE acid preparation device.
[0022] In the drawings: 1-chlorobenzene cleaning high tank, 2-ethylbenzene storage tank, 3-rotary plate heat exchanger, 4-feeding bin, 5-frequency conversion unloader, 6-acylation reaction kettle, 7-heat preservation kettle, 8-chlorobenzene flushing pipeline, 9-acylation liquid buffer tank, 10-acylation liquid deslagging pipeline, 11-acylation liquid conveying pump, 12-hydrolysis kettle, 13-acylation liquid settling tank, 14-ethylbenzene conveying pump, 15-ethylbenzene intermediate tank, 16-condenser group, 17-condensation reflux device, 18-separation tank. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.
[0024] Embodiment:
[0025] Reference Figures 1-3The utility model discloses a BE acid preparation device, including the chlorobenzene cleaning high -level tank 1 that contains chlorobenzene, the ethyl benzene storage tank 2 that contains ethyl benzene, the feeding bin 4 and the acylation reaction kettle 6, send the phthalic anhydride, aluminium chloride to the feeding bin 4 and carry out preliminary mixing, obtain the mixed material. The mixed material, ethyl benzene, chlorobenzene are sent to the acylation reaction kettle 6 and carry out acylation reaction, after the reaction completes, the liquid is sent to the hydrolysis kettle 12 and carries out hydrolysis reaction, obtains the crude BE acid. In the hydrolysis reaction, because the temperature in the hydrolysis kettle 12 is higher, this leads to the ethyl benzene, chlorobenzene that unreacted completion evaporates and follows the tail gas and is discharged, in order to avoid this part of raw material waste, the present scheme introduces the condenser group 16, after reaching the condenser group 16, the heat exchange of tail gas occurs, the temperature of tail gas drops rapidly, this makes the ethyl benzene, chlorobenzene contained in the tail gas condenses and forms droplets, re-liquid form is collected.
[0026] In order to facilitate the flow of materials, chlorobenzene cleaning high -level tank 1, ethyl benzene storage tank 2 and feeding bin 4 are connected with acylation reaction kettle 6 pipeline, still include the hydrolysis kettle 12 and the condenser group 16 of pipeline connection in proper order, acylation reaction kettle 6 is connected with hydrolysis kettle 12 pipeline.
[0027] Preferably, the condenser group 16 includes a plurality of series-connected condensation refluxers 17. The plurality of series-connected condensation refluxers 17 condense the tail gas multiple times, which makes the concentration of ethyl benzene and chlorobenzene contained in the tail gas gradually decrease during the flow of the tail gas, until the concentration meets the emission standard.
[0028] In the present scheme, the condensation refluxers 17 are not less than three, and the condensation refluxers 17 are round block graphite absorbers.
[0029] The recovered ethyl benzene and chlorobenzene are in a mixed state. In order to facilitate the separation of the two, the present scheme further includes a separation tank 18, which is connected with the condenser group 16 pipeline. The evaporation temperatures of ethyl benzene and chlorobenzene are different. By utilizing this characteristic, the separation tank 18 heats the mixed liquid to promote the separation of the two.
[0030] In order to ensure that the acylation reaction is fully carried out, the mixed solution in the acylation reaction kettle 6 needs to be kept warm for a period of time. If the mixed liquid is kept warm in the acylation reaction kettle 6, it will inevitably affect the working efficiency of the acylation reaction kettle 6. Therefore, a heat preservation kettle 7 is arranged between the acylation reaction kettle 6 and the hydrolysis kettle 12, and the acylation reaction kettle 6 and the hydrolysis kettle 12 are connected with the heat preservation kettle 7 pipeline. The mixed liquid in the acylation reaction kettle 6 is sent to the heat preservation kettle 7 for heat preservation. When the mixed liquid in the acylation reaction kettle 6 is transported, ethyl benzene, chlorobenzene, aluminium chloride and phthalic anhydride are sent to the acylation reaction kettle 6 again for a new acylation reaction. The design improves the use efficiency of the acylation reaction kettle 6.
[0031] After a period of insulation, the reaction liquid in the insulation kettle 7 needs to be sent to the hydrolysis kettle 12 for hydrolysis reaction. However, there is a part of unreacted aluminum chloride solid particles in the reaction solution, which makes the reaction solution prone to pipeline blockage when entering the hydrolysis kettle 12. In order to avoid this problem, the acylation liquid settling tank 13 is arranged between the insulation kettle 7 and the hydrolysis kettle 12, and the insulation kettle 7 and the hydrolysis kettle 12 are both connected with the acylation liquid settling tank 13 by pipelines. The reaction solution first enters the acylation liquid settling tank 13 and stands for a period of time, at this time the aluminum chloride in the reaction solution will settle at the bottom of the acylation liquid settling tank 13. Then the upper reaction solution will reach the hydrolysis kettle 12 through the pipeline.
[0032] Because the temperature in the acylation reaction kettle 6 is high, part of the raw materials will also evaporate and escape. In order to recover this part of the raw materials, the acylation reaction kettle 6 is also connected with a rotating plate heat exchanger 3 by a pipeline.
[0033] The reaction in the hydrolysis kettle 12 needs to continue for a period of time, which causes the reaction solution after the completion of the acylation reaction to be unable to enter the hydrolysis kettle 12. Therefore, the acylation liquid settling tank 13 is also connected with the acylation liquid buffer tank 9, and the acylation liquid buffer tank 9 is arranged between the hydrolysis kettle 12 and the acylation liquid buffer tank 9 by an acylation liquid conveying pump 11, and the acylation liquid settling tank 13 is arranged between the hydrolysis kettle 12 by an acylation liquid discharge pipeline 10. The reaction solution will be sent to the acylation liquid buffer tank 9 through the pipeline of the acylation liquid settling tank 13 for temporary storage, and after the solution in the hydrolysis kettle 12 is discharged, the acylation liquid conveying pump 11 will pump the temporarily stored reaction solution in the acylation liquid buffer tank 9 to the hydrolysis kettle 12, and start a new round of hydrolysis reaction.
[0034] In this scheme, the role of chlorobenzene is to dissolve phthalic anhydride as a solvent. Before overhauling the entire production device, we need to clean the entire production device and clean the residual raw materials in the entire production device. In order to facilitate the cleaning of the residual raw materials, we need to use chlorobenzene to clean a plurality of mechanisms, therefore, the insulation kettle 7, the acylation liquid settling tank 13, the acylation liquid buffer tank 9 are all arranged with chlorobenzene flushing pipeline 8 between the chlorobenzene cleaning high tank 1. The chlorobenzene solution in the chlorobenzene cleaning high tank 1 is sent to the insulation kettle 7, the acylation liquid settling tank 13, the acylation liquid buffer tank 9 in turn through the chlorobenzene flushing pipeline 8, and the cleaning work is completed.
[0035] In order to facilitate the sending of ethylbenzene to the ethylbenzene storage tank 2, an ethylbenzene intermediate tank 15 is further included, which is connected with the ethylbenzene storage tank 2 by a pipeline, and an ethylbenzene conveying pump 14 is arranged between the ethylbenzene intermediate tank 15 and the ethylbenzene storage tank 2.
[0036] In this scheme, the hydrolysis kettle 12 is also connected with a hydrochloric acid storage tank and a hydrolysis liquid separator. The hydrochloric acid in the hydrochloric acid storage tank is pumped to the hydrolysis kettle 12. The hydrolysis liquid obtained after the reaction of the hydrolysis kettle 12 is sent to the hydrolysis liquid separator, which is to separate the BE acid in the hydrolysis liquid for subsequent use.
[0037] As Figure 4 The production device can be several sets, and the several sets of BE acid production devices are used in parallel to ensure that the BE acid can be produced continuously.
[0038] In order to facilitate the feeding bin 4 unloading, the frequency conversion unloader 5 is arranged between the feeding bin 4 and the acylation reaction kettle 6.
[0039] In summary, the advantages of the present scheme are: by sending the tail gas generated in the hydrolysis kettle 12 to the condenser group 16 for condensation treatment, the reaction raw materials such as ethylbenzene and chlorobenzene evaporated due to high temperature are condensed and recovered, which reduces the cost and avoids the waste of raw materials.
[0040] Of course, the present application can also have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application. However, these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.
Claims
1. A BE acid preparation apparatus, comprising a chlorobenzene cleaning high-level tank (1), an ethylbenzene storage tank (2), a feeding hopper (4), and an acylation reactor (6), wherein the chlorobenzene cleaning high-level tank (1), the ethylbenzene storage tank (2), and the feeding hopper (4) are all connected to the acylation reactor (6) via pipelines, characterized in that, It also includes a hydrolysis kettle (12) and a condenser group (16), the acylation reaction kettle (6) is connected with the hydrolysis kettle (12) by pipeline, and the hydrolysis kettle (12) is connected with the condenser group (16) by pipeline.
2. The BE acid preparation device of claim 1, wherein, The condenser group (16) includes several series of condensation refluxers (17).
3. The BE acid preparation device of claim 2, wherein, The condensation refluxer (17) is not less than three, and the condensation refluxer (17) is a round block type graphite absorber.
4. The BE acid preparation device of claim 2, wherein, It also includes a separation tank (18), which is connected with the hydrolysis kettle (12) by pipeline, and the separation tank (18) is connected with the condenser group (16) by pipeline.
5. The BE acid preparation device of claim 1, wherein, The acylation reaction kettle (6) and the hydrolysis kettle (12) are provided with a heat preservation kettle (7), and the acylation reaction kettle (6), the hydrolysis kettle (12) and the heat preservation kettle (7) are connected by pipeline.
6. The BE acid preparation device of claim 5, wherein, The heat preservation kettle (7) is also connected with a rotating plate heat exchanger (3) by pipeline.
7. The BE acid preparation device of claim 5, wherein, The heat preservation kettle (7) and the hydrolysis kettle (12) are provided with an acylation liquid settling tank (13), and the heat preservation kettle (7), the hydrolysis kettle (12) and the acylation liquid settling tank (13) are connected by pipeline.
8. The BE acid preparation device of claim 7, wherein, The acylation liquid settling tank (13) is also connected with an acylation liquid buffer tank (9), and the acylation liquid buffer tank (9) and the hydrolysis kettle (12) are provided with an acylation liquid conveying pump (11), and the acylation liquid settling tank (13) and the hydrolysis kettle (12) are provided with an acylation liquid slag discharge pipeline (10).
9. The BE acid preparation device of claim 7, wherein, The heat preservation kettle (7), the acylation liquid settling tank (13), the acylation liquid buffer tank (9) and the chlorobenzene cleaning high tank (1) are provided with a chlorobenzene flushing pipeline (8).
10. The BE acid preparation device of claim 1, wherein, It also includes an ethylbenzene intermediate tank (15), which is connected with the ethylbenzene storage tank (2) by pipeline, and the ethylbenzene intermediate tank (15) and the ethylbenzene storage tank (2) are provided with an ethylbenzene conveying pump (14).