BE acid dehydration device in synthesis process of 2-ethyl anthraquinone

Abstract

The utility model discloses a BE acid dehydration device in the synthesis process of 2-ethyl anthraquinone, and relates to the technical field of chemical engineering, the BE acid dehydration device is sequentially provided with a hydrolysate separator, a first washing separator and a second washing separator which are connected through pipelines according to the dehydration sequence, a first hydrolysate pump is arranged between the hydrolysate separator and the first washing separator, and a second hydrolysate pump is arranged between the second washing separator and the second washing separator. A second hydrolysate pump is arranged between the first washing separator and the second washing separator, the second washing separator is further connected with a vacuum dehydration condenser through a pipeline, and a BE acid metering tank is arranged between the vacuum dehydration condenser and the second washing separator. Therefore, various impurities in the BE acid crude liquid are gradually separated by arranging the hydrolysate separator, the first water washing separator and the second water washing separator, the finally obtained BE acid is ensured to have higher purity, and meanwhile, the separated impurities can be gradually recycled and repeatedly used, so that the production cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model is suitable for chemical technology field, provide a BE acid dehydration device in 2-ethyl anthraquinone synthesis process. BACKGROUND

[0002] BE acid is also called 2- (4'- ethyl benzoyl) benzoic acid, is synthesized under the condition of aluminum chloride as catalyst for ethylbenzene and phthalic anhydride. It is the raw material for synthesizing 2-ethyl anthraquinone.

[0003] BE acid needs to go through hydrolysis reaction in the production process, and the solution after reaction contains BE acid, water and solvent and other materials, in order to ensure the purity of BE acid, we need to carry out dehydration purification treatment to the solution.

[0004] The existing dehydration purification is generally carried out in the hydrolysis kettle after the hydrolysis reaction is completed. However, this dehydration method is relatively simple, resulting in more impurities in the purified BE acid, which is not conducive to the subsequent production of 2-ethyl anthraquinone.

[0005] Therefore, we need to improve the existing BE acid dehydration process. CONTENT OF THE UTILITY MODEL

[0006] In view of the above defects, the utility model aims at providing a BE acid dehydration device in 2-ethyl anthraquinone synthesis process, the purpose is to solve the problem in the background.

[0007] A BE acid dehydration device in 2-ethyl anthraquinone synthesis process is provided, which is sequentially provided with a hydrolysis liquid separator, a first water washing separator and a second water washing separator connected by pipelines in dehydration order, a first hydrolysis liquid pump is arranged between the hydrolysis liquid separator and the first water washing separator, a second hydrolysis liquid pump is arranged between the first water washing separator and the second water washing separator, a vacuum dehydration condenser and a BE acid metering tank are further included, the second water washing separator and the BE acid metering tank are connected by pipelines, and the vacuum dehydration condenser and the BE acid metering tank are connected by pipelines.

[0008] Among them, the first countercurrent desolventizing tower is arranged between the second water washing separator and the BE acid metering tank, and the second water washing separator, the BE acid metering tank are connected with the first countercurrent desolventizing tower by pipelines.

[0009] Among them, the second countercurrent desolventizing tower is arranged between the first countercurrent desolventizing tower and the BE acid metering tank, and the second countercurrent desolventizing tower is connected with the first countercurrent desolventizing tower and the BE acid metering tank by pipelines.

[0010] Among them, the BE acid dehydration kettle is arranged between the second countercurrent desolventizing tower and the BE acid metering tank, and the second countercurrent desolventizing tower and the BE acid metering tank are connected with the BE acid dehydration kettle by pipelines.

[0011] The second countercurrent desolventizing tower is further connected with a water separator, and a drain pipe is installed on the outer wall of the water separator.

[0012] The vacuum dewatering condenser is further connected with a vacuum buffer tank, and the vacuum buffer tank is connected with a first vacuum pump.

[0013] The aluminum liquid desolventizing kettle is connected with the hydrolysis liquid separator.

[0014] The aluminum liquid desolventizing kettle is further connected with an aluminum liquid condensing assembly, which comprises an aluminum liquid condenser, a separation tank, a chlorobenzene receiving tank and a second vacuum pump.

[0015] Advantages

[0016] The hydrolysis liquid separator, the first water washing separator and the second water washing separator are arranged to gradually separate various impurities in the BE acid crude liquid, so that the BE acid obtained finally has high purity, and the separated impurities can be recycled and reused, thereby saving production cost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure diagram of a BE acid dewatering device in a 2-ethylanthraquinone synthesis process.

[0018] Figure 2 It is a structure diagram of a BE acid dewatering device in a 2-ethylanthraquinone synthesis process. Figure 1 It is a local enlarged view of a in the figure.

[0019] In the figure: 1-hydrolysis liquid separator, 2-first hydrolysis liquid pump, 3-first water washing separator, 4-second hydrolysis liquid pump, 5-second water washing separator, 6-first countercurrent desolventizing tower, 7-second countercurrent desolventizing tower, 8-water separator, 9-BE acid dewatering kettle, 10-BE acid metering tank, 11-vacuum dewatering condenser, 12-vacuum buffer tank, 13-first vacuum pump, 14-aluminum chloride conveying pump, 15-aluminum liquid desolventizing kettle, 16-aluminum liquid condenser, 17-separation tank, 18-chlorobenzene receiving tank, 19-second vacuum pump. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0021] Embodiment:

[0022] The BE acid crude liquid obtained after the hydrolysis reaction is completed contains a large amount of impurities, which are generally composed of water, aluminum chloride and solvent (chlorobenzene) and the like, and the proportion of water is large, so we need to carry out dehydration purification treatment on the BE acid crude liquid.

[0023] Therefore, referring to Figures 1-2 The purpose of the utility model is to provide a BE acid dehydration device in 2-ethylanthraquinone synthesis process, hydrolysis liquid separator 1, first water washing separator 3 and second water washing separator 5 are sequentially provided with pipeline connection according to dehydration sequence. Among them, the role of hydrolysis liquid separator 1 is to receive the hydrolysis liquid of reaction completion, because the density of BE acid and water is different, so the hydrolysis liquid will be layered in hydrolysis liquid separator 1, at this time, we can extract water and the mixed aluminum chloride particles in water together, realize the preliminary dehydration work. Subsequently, the hydrolysis liquid is sent to the first water washing separator 3, which is to remove the aluminum chloride particles in the hydrolysis liquid. In the process of removing aluminum chloride, water is introduced into the hydrolysis liquid again, for this purpose, we introduce the second water washing separator 5, which is to further remove water and ensure the purity of BE acid.

[0024] In order to facilitate the guidance of hydrolysis liquid flow, the first hydrolysis liquid pump 2 is arranged between the hydrolysis liquid separator 1 and the first water washing separator 3, and the second hydrolysis liquid pump 4 is arranged between the first water washing separator 3 and the second water washing separator 5. In order to facilitate the measurement of the weight of the obtained BE acid; It also includes a vacuum dehydration condenser 11 and a BE acid metering tank 10, the second water washing separator 5 and the BE acid metering tank 10 are connected by pipelines, and the vacuum dehydration condenser 11 and the BE acid metering tank 10 are connected by pipelines. After the impurities in the hydrolysis liquid are removed, only BE acid is left, and the BE acid metering tank 10 in the present scheme is used to hold BE acid and measure the yield of BE acid. Because the temperature of the hydrolysis liquid is high, part of the water vapor will flow out with the tail gas when the second water washing separator 5 removes the impurities, for this purpose, the vacuum dehydration condenser 11 is introduced to condense and recover the water vapor in the tail gas.

[0025] The BE acid obtained in the above process also contains part of the solvent impurities, in order to ensure the purity of the BE acid, we also need to remove this part of the solvent, for this purpose, the first countercurrent desolventizing tower 6 is arranged between the second water washing separator 5 and the BE acid metering tank 10, and the second water washing separator 5, the BE acid metering tank 10 and the first countercurrent desolventizing tower 6 are connected by pipelines. The first countercurrent desolventizing tower 6 is removed through multiple cycles, which maximally reduces the solvent contained in the BE acid.

[0026] Preferably, the first countercurrent desolventizing tower 6 is provided with a second countercurrent desolventizing tower 7 between the first countercurrent desolventizing tower 6 and the BE acid metering tank 10, and the second countercurrent desolventizing tower 7 is connected with the first countercurrent desolventizing tower 6 and the BE acid metering tank 10 by pipelines. The BE acid from the first countercurrent desolventizing tower 6 is further purified in the second countercurrent desolventizing tower 7 to remove the solvent impurities in the BE acid.

[0027] In order to further remove the water in the BE acid, a BE acid dehydration kettle 9 is arranged between the second countercurrent desolventizing tower 7 and the BE acid metering tank 10, and the second countercurrent desolventizing tower 7 and the BE acid metering tank 10 are connected with the BE acid dehydration kettle 9 by pipelines.

[0028] Preferably, the second countercurrent desolventizing tower 7 is further connected with a water separator 8, and a water drainage pipeline is arranged on the outer wall of the water separator 8. The water separator 8 is used to collect the water accumulated in the second countercurrent desolventizing tower 7 and discharge the collected water.

[0029] In order to facilitate the flow of the BE acid, the vacuum dehydration condenser 11 is further connected with a first vacuum pump 13, and a vacuum buffer tank 12 is arranged between the vacuum pump and the vacuum dehydration condenser 11. The first vacuum pump 13 causes the BE acid metering tank 10 to be in a negative pressure state when working, which causes the BE acid in the second countercurrent desolventizing tower 7 to be sucked into the BE acid metering tank 10 for temporary storage. At the same time, the first vacuum pump 13 also guides the water vapor in the second countercurrent desolventizing tower 7 to the vacuum dehydration condenser 11 for condensation, and the water obtained after condensation is temporarily stored in the vacuum buffer tank 12.

[0030] The hydrolysis liquid separator 1 separates most of the water and aluminum chloride. In order to reduce the cost, we need to recover the aluminum chloride. Therefore, an aluminum liquid desolventizing kettle 15 is further included, which is connected with the hydrolysis liquid separator 1 by pipelines, and an aluminum chloride conveying pump 14 is arranged between the aluminum liquid desolventizing kettle 15 and the hydrolysis liquid separator 1. The aluminum liquid desolventizing kettle 15 is used to separate the water, part of the solvent and the aluminum chloride, and to maximize the recovery of the aluminum chloride.

[0031] In order to facilitate the recovery of water, the aluminum liquid desolventizing kettle 15 is further connected with an aluminum liquid condensing assembly, which includes an aluminum liquid condenser 16, a separation tank 17, a chlorobenzene receiving tank 18 and a second vacuum pump 19. The aluminum liquid condenser 16 is connected with the aluminum liquid desolventizing kettle 15 and the separation tank 17 by pipelines respectively, and the chlorobenzene receiving tank 18 and the second vacuum pump 19 are connected with the separation tank 17 by pipelines.

[0032] In summary, the advantages of the present scheme are: by setting the hydrolysate separator 1, the first water washing separator 3, the second water washing separator 5 to separate various impurities in the BE acid crude liquid gradually, the BE acid obtained finally has higher purity, meanwhile, the separated impurities can be recycled and reused, which saves the production cost.

[0033] Of course, the present application can also have other various embodiments, without departing from the spirit and essence of the present application, those skilled in the art can make various corresponding changes and modifications according to the present application, but these corresponding changes and modifications should belong to the protection scope of the claims attached to the present application.

Claims

1. A BE acid dehydration unit in a 2-ethylanthraquinone synthesis process, characterized by, Hydrolysate separator (1), first water washing separator (3) and second water washing separator (5) are sequentially arranged in dehydration order and connected by pipelines, a first hydrolysate pump (2) is arranged between the hydrolysate separator (1) and the first water washing separator (3), and a second hydrolysate pump (4) is arranged between the first water washing separator (3) and the second water washing separator (5); a vacuum dehydration condenser (11) and a BE acid metering tank (10) are further included, the second water washing separator (5) is connected with the BE acid metering tank (10) by a pipeline, and the vacuum dehydration condenser (11) is connected with the BE acid metering tank (10) by a pipeline.

2. The BE acid dehydration unit in the 2-ethylanthraquinone synthesis process according to claim 1, characterized in that, A first countercurrent desolventizing tower (6) is arranged between the second water washing separator (5) and the BE acid metering tank (10), and the second water washing separator (5) and the BE acid metering tank (10) are connected with the first countercurrent desolventizing tower (6) by pipelines.

3. The BE acid dehydration unit in the 2-ethylanthraquinone synthesis process according to claim 2, characterized in that, A second countercurrent desolventizing tower (7) is arranged between the first countercurrent desolventizing tower (6) and the BE acid metering tank (10), and the second countercurrent desolventizing tower (7) is connected with the first countercurrent desolventizing tower (6) and the BE acid metering tank (10) by pipelines.

4. The BE acid dehydration unit in the 2-ethylanthraquinone synthesis process according to claim 3, characterized in that, A BE acid dehydration kettle (9) is arranged between the second countercurrent desolventizing tower (7) and the BE acid metering tank (10), and the second countercurrent desolventizing tower (7) and the BE acid metering tank (10) are connected with the BE acid dehydration kettle (9) by pipelines.

5. The BE acid dehydration unit in the 2-ethylanthraquinone synthesis process of claim 3, wherein, The second countercurrent desolventizing tower (7) is further connected with a water separator (8) by a pipeline, and a drain pipeline is installed on the outer wall of the water separator (8).

6. The BE acid dehydration unit in 2-ethylanthraquinone synthesis process of claim 2, wherein, The vacuum dehydration condenser (11) is further connected with a vacuum buffer tank (12) by a pipeline, and the vacuum buffer tank (12) is connected with a first vacuum pump (13) by a pipeline.

7. The BE acid dehydration unit in 2-ethylanthraquinone synthesis process of claim 1, wherein, An aluminum liquid desolventizing kettle (15) is further included, and the aluminum liquid desolventizing kettle (15) is connected with the hydrolysate separator (1) by a pipeline.

8. The BE acid dehydration unit in the 2-ethylanthraquinone synthesis process according to claim 7, characterized in that, The aluminum liquid desolventizing kettle (15) is further connected with an aluminum liquid condensing assembly, the aluminum liquid condensing assembly includes an aluminum liquid condenser (16), a separation tank (17), a chlorobenzene receiving tank (18) and a second vacuum pump (19), the aluminum liquid condenser (16) is connected with the aluminum liquid desolventizing kettle (15) and the separation tank (17) by pipelines respectively, and the chlorobenzene receiving tank (18) and the second vacuum pump (19) are connected with the separation tank (17) by pipelines.

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