Device for producing 2-ethyl anthraquinone

Abstract

The utility model discloses a device for producing 2-ethyl anthraquinone, which comprises an acylation reaction tank, a hydrolysis tank, a desolventizing tank, a closed-loop reaction tank, an extraction buffer tank, an alkali washing tank, a layering tower, a water washing tower, a distillation tank and a 2-ethyl anthraquinone temporary storage tank which are communicated with one another, and a gas outlet of the acylation reaction tank is sequentially communicated with a first water spray tower and the hydrolysis tank; a liquid inlet pipe extending into the bottom of the alkali washing tank is arranged in the alkali washing tank, and the extraction buffer tank is communicated with the alkali washing tank through the liquid inlet pipe; gas outlets in the tops of the closed-loop reaction tank, the extraction buffer tank and the alkali washing tank are sequentially communicated with a second water spray tower and an alkali liquor spray tower. The device can effectively collect and treat waste water and waste gas in production, reduces energy consumption, is more environment-friendly, has a good alkali washing effect, can effectively remove impurities such as residual acid liquor in a product, and further improves the quality of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of 2-ethylanthraquinone, in particular to a device for producing 2-ethylanthraquinone. Background Art

[0002] 2-Ethylanthraquinone is an important organic compound with a wide range of applications. It is a derivative of anthraquinone compounds, which have important applications in dyes, fluorescent agents, photosensitive materials and other fields.

[0003] At present, the synthesis of 2-ethylanthraquinone usually uses ethylbenzene and phthalic anhydride as raw materials, and the target product is obtained by acylation, hydrolysis, desolventization, ring closure, alkali washing and other treatments in sequence. A large amount of waste water and waste gas will be generated in the above production process. If they are not treated, it will not only pollute the environment, but also cause waste of resources. In addition, if the alkali washing is not thorough in the above process, the sulfur content in the product will increase, thereby reducing the quality of the product. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a device for producing 2-ethylanthraquinone is provided, which can effectively collect and treat waste water and waste gas in production, reduce energy consumption, and is more environmentally friendly. The alkali washing effect of the device is good, and impurities such as residual acid in the product can be effectively removed, thereby improving the quality of the product.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A device for producing 2-ethylanthraquinone, comprising an acylation reaction tank, a hydrolysis tank, a desolvation tank and a closed-loop reaction tank connected to each other, wherein the gas outlet of the acylation reaction tank is connected to a first water spray tower, and the liquid outlet of the first water spray tower is connected to the hydrolysis tank;

[0007] It also includes an extraction buffer tank connected to the closed-loop reaction tank, the overflow port on the top of the extraction buffer tank is connected to the alkali washing tank, and the overflow port on the top of the alkali washing tank is connected to the layering tower, the water washing tower, the distillation tank and the 2-ethylanthraquinone temporary storage tank in sequence; the alkali washing tank is also connected to the alkali liquid temporary storage tank through a pipeline and a valve; the alkali washing tank is provided with a liquid inlet pipe extending into the bottom of the alkali washing tank, and the overflow port of the extraction buffer tank is connected to the alkali washing tank through the liquid inlet pipe;

[0008] The gas outlets at the tops of the closed-loop reaction tank, the extraction buffer tank and the alkali washing tank are connected to the second water spray tower and the alkali solution spray tower in sequence;

[0009] The lower parts of the first water spray tower, the second water spray tower and the alkali solution spray tower are all provided with an air distribution plate connected to the air inlet pipe. The air distribution plate includes a shell connected to the air inlet pipe, a plurality of air outlet holes are provided on the top of the shell, and a multi-layer porous air distribution plate is provided in the shell.

[0010] As an improved technical solution, an extraction solvent inlet is provided at the top of the extraction buffer tank, a feed liquid inlet is provided at the bottom of the extraction buffer tank, and the closed-loop reaction tank is connected to the extraction buffer tank through the feed liquid inlet.

[0011] As an improved technical solution, the discharge port at the bottom of the extraction buffer tank is connected to the first acid water temporary storage tank through a pipeline and a valve.

[0012] As an improved technical solution, the closed-loop reaction tank is connected to the sulfuric acid temporary storage tank through a pipeline and a valve.

[0013] As an improved technical solution, the liquid outlet of the second water spray tower is connected to the second acid water temporary storage tank; the liquid outlet of the alkali solution spray tower is connected to the waste brine temporary storage tank.

[0014] As an improved technical solution, a premixer and a circulation pump are provided on the discharge pipe at the bottom of the alkali washing tank, the discharge pipe is connected to the feed end of the liquid inlet pipe through a valve, and the alkali solution temporary storage tank is connected to the premixer through a pipe and a valve.

[0015] As an improved technical solution, the gas outlet at the top of the desolventizing tank is connected to the condenser and the solvent recovery tank.

[0016] As an improved technical solution, a plurality of spoiler teeth are arranged circumferentially within the air outlet.

[0017] As an improved technical solution, the holes on two adjacent porous gas distribution plates are arranged in a staggered manner.

[0018] As an improved technical solution, the acylation reaction tank, the hydrolysis tank, the desolventizing tank and the distillation tank are all provided with stirring devices.

[0019] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0020] The device comprises an acylation reaction tank, a hydrolysis tank, a desolventizing tank, a closed-loop reaction tank, an extraction buffer tank, an alkali washing tank, a layering tower, a water washing tower, a distillation tank and a 2-ethylanthraquinone temporary storage tank which are connected. The gas outlet of the acylation reaction tank is connected to the first water spray tower, and the liquid outlet of the first water spray tower is connected to the hydrolysis tank, so that the acid gas generated in the acylation process is effectively recovered and used in the hydrolysis process.

[0021] (2) The alkali washing tank of the device is provided with a liquid inlet pipe extending into the bottom of the alkali washing tank, and the overflow port of the extraction buffer tank is connected to the alkali washing tank through the liquid inlet pipe; a premixer and a circulation pump are provided on the discharge pipe at the bottom of the alkali washing tank, and the discharge pipe is connected to the feed end of the liquid inlet pipe through a valve, and the alkali solution temporary storage tank is connected to the premixer through a pipe and a valve; the organic phase overflowing from the extraction buffer tank enters the bottom of the alkali washing tank, and is fully in contact with the alkali solution during the upward movement, thereby improving the alkali washing efficiency. Moreover, during the alkali washing process, the feed liquid in the alkali washing tank is forced to circulate through the circulation pump, and the circulating feed liquid is fully mixed with the alkali solution through the premixer before entering the alkali washing tank, further improving the alkali washing efficiency.

[0022] (3) The gas outlets at the top of the closed-loop reaction tank, extraction buffer tank and alkali washing tank of the device are connected to the second water spray tower and the alkali liquid spray tower in sequence; the device effectively recovers and treats the acidic gas emitted from the liquid during the closed-loop reaction, extraction and alkali washing processes, thereby reducing energy consumption and avoiding air pollution.

[0023] (4) The first water spray tower, the second water spray tower and the alkali solution spray tower of the device are all provided with a gas distribution plate connected to the air inlet pipe at the bottom, and the gas distribution plate includes a shell connected to the air inlet pipe, and a plurality of air outlet holes are provided at the top of the shell, and a plurality of spoiler teeth are provided in the circumferential direction of the air outlet holes, and a plurality of multi-layer porous gas distribution plates are provided in the shell, and the holes on two adjacent porous gas distribution plates are arranged in a staggered manner. The above arrangement improves the uniformity of gas distribution and improves the gas absorption efficiency.

[0024] (5) An extraction solvent inlet is provided at the top of the extraction buffer tank, and a feed liquid inlet is provided at the bottom of the extraction buffer tank. The closed-loop reaction tank is connected to the extraction buffer tank through the feed liquid inlet. The acid precipitation liquid after the closed-loop reaction enters from the bottom of the extraction buffer tank, and the extraction solvent enters from the extraction solvent inlet at the top of the extraction buffer tank, thereby ensuring that the extraction solvent is fully in contact with the acid precipitation liquid and improving the extraction efficiency.

[0025] (6) The discharge port at the bottom of the extraction buffer tank is connected to the first acid water temporary storage tank through a pipeline and a valve; the liquid outlet of the second water spray tower is connected to the second acid water temporary storage tank; the liquid outlet of the alkali solution spray tower is connected to the waste brine temporary storage tank. The above arrangement can not only effectively recover the acid solution during extraction, but also effectively recover the gas during closed-loop reaction, extraction and alkali washing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 It is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the gas distribution disk;

[0029] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0030] Figure 4 It is a schematic diagram of the internal structure of the gas distribution disk;

[0031] In the figure, 1, acylation reaction tank; 2, hydrolysis tank; 3, desolventizing tank; 4, closed-loop reaction tank; 5, extraction buffer tank; 6, first water spray tower; 7, sulfuric acid temporary storage tank; 8, alkali washing tank; 9, layering tower; 10, water washing tower; 11, distillation tank; 12, 2-ethylanthraquinone temporary storage tank; 13, alkali solution temporary storage tank; 14, liquid inlet pipe; 15, second water spray tower; 16, alkali solution spray tower; 17, air inlet pipe; 18, air distribution plate; 19, shell; 20, air outlet; 21, porous air distribution plate; 22, first acid water temporary storage tank; 23, second acid water temporary storage tank; 24, waste brine temporary storage tank; 25, premixer; 26, circulation pump; 27, discharge pipe; 28, condenser; 29, solvent recovery tank; 30, spoiler teeth; 31, stirring device. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0035] Example 1

[0036] like Figures 1 to 4 As shown, a device for producing 2-ethylanthraquinone comprises an acylation reaction tank 1, a hydrolysis tank 2, a desolvation tank 3 and a closed-loop reaction tank 4 which are connected to each other. The gas outlet of the acylation reaction tank 1 is connected to a first water spray tower 6, and the liquid outlet of the first water spray tower 6 is connected to the hydrolysis tank 2; the closed-loop reaction tank 4 is connected to a sulfuric acid temporary storage tank 7 through a pipeline and a valve;

[0037] The closed-loop reaction tank 4 is connected to the feed liquid inlet at the bottom of the extraction buffer tank 5, and an extraction solvent inlet (not shown) is provided at the top of the extraction buffer tank 5;

[0038] The overflow port at the top of the extraction buffer tank 5 is connected to the alkali washing tank 8, and the overflow port at the top of the alkali washing tank 8 is connected to the layering tower 9, the water washing tower 10, the distillation tank 11 and the 2-ethylanthraquinone temporary storage tank 12 in sequence; the alkali washing tank 8 is also connected to the alkali solution temporary storage tank 13 through a pipeline and a valve; the alkali washing tank 8 is provided with a liquid inlet pipe 14 extending into the bottom of the alkali washing tank 8, and the overflow port of the extraction buffer tank 5 is connected to the alkali washing tank 8 through the liquid inlet pipe 14.

[0039] Due to the adoption of the above technical scheme, when producing 2-ethylanthraquinone, ethylbenzene, aluminum chloride and phthalic anhydride are added to the acylation reaction tank 1 filled with solvent for reaction. After the acylation reaction is completed, the reaction liquid enters the hydrolysis tank 2 and is hydrolyzed under acidic conditions. The hydrogen chloride gas generated during the acylation reaction is absorbed by the first water spray tower 6 and the feed liquid enters the hydrolysis tank 2 to provide an acidic environment. After the hydrolysis is completed, the feed liquid enters the desolventizing tank 3 to remove the solvent, and then enters the closed-loop reaction tank 4. Sulfuric acid is introduced into the closed-loop reactor through the sulfuric acid temporary storage tank 7 for closed-loop reaction. The closed-loop reaction liquid is acidified by process water and then enters the closed-loop reaction tank 4. The slurry is fed into the extraction buffer tank 5, and the extractant is added into the extraction buffer tank 5, and then the stratification treatment is carried out. The stratified organic phase is discharged from the overflow port of the extraction buffer tank 5 and enters the bottom of the alkali washing tank 8 through the liquid inlet pipe 14, and is fully mixed with the alkali solution reserved in the alkali washing tank 8 to perform alkali washing to remove the residual acid and by-products in the feed liquid. After the alkali washing, the feed liquid enters the stratification tower 9 for stratification, and the organic phase enters the water washing tower 10 from the overflow port at the top of the stratification tower 9 for water washing treatment. The organic phase after water washing enters the distillation tank 11 from the overflow port at the top of the water washing tower 10, and the product obtained after removing the solvent enters the 2-ethylanthraquinone temporary storage tank 12.

[0040] In this embodiment, the gas outlets at the top of the closed-loop reaction tank 4, the extraction buffer tank 5 and the alkali washing kettle are connected to the second water spray tower 15 and the alkali solution spray tower 16 in sequence; the lower parts of the first water spray tower 6, the second water spray tower 15 and the alkali solution spray tower 16 are all provided with a gas distribution plate 18 connected to the air inlet pipe 17, and the gas distribution plate 18 includes a shell 19 connected to the air inlet pipe 17, and a plurality of air outlet holes 20 are provided on the top of the shell 19, and a multi-layer porous gas distribution plate 21 is provided in the shell 19.

[0041] In this embodiment, the discharge port at the bottom of the extraction buffer tank 5 is connected to the first acid water temporary storage tank 22 through a pipeline and a valve. The liquid outlet of the second water spray tower 15 is connected to the second acid water temporary storage tank 23; the liquid outlet of the alkali solution spray tower 16 is connected to the waste brine temporary storage tank 24.

[0042] Due to the adoption of the above technical scheme, the acidic gas generated during the closed-loop reaction, extraction and alkali washing process can be treated in turn by the second water spray tower 15 and the alkali solution spray tower 16. The liquid sprayed by the second water spray tower 15 enters the second acid water temporary storage tank 23 for subsequent treatment and recovery; the liquid sprayed by the alkali solution spray tower 16 enters the waste brine temporary storage tank 24 for subsequent treatment and recovery; and the water phase separated from the extraction buffer tank 5 enters the first acid water temporary storage tank 22 from the discharge port at the bottom for subsequent treatment and recovery.

[0043] In this embodiment, a premixer 25 and a circulation pump 26 are provided on the discharge pipe 27 at the bottom of the alkali washing tank 8. The discharge pipe 27 is connected to the feed end of the liquid inlet pipe 14 through a valve, and the alkali solution temporary storage tank 13 is connected to the premixer 25 through a pipe and a valve.

[0044] In order to improve the efficiency of alkali washing and reduce the sulfur content in the product, the device forces the liquid in the alkali washing tank 8 to circulate through the circulation pump 26 on the discharge pipe 27 during alkali washing, and the circulating liquid is fully mixed with the alkali liquid in the premixer 25 and then re-enters the alkali washing tank 8 for treatment, which greatly improves the efficiency of alkali washing.

[0045] In this embodiment, the gas outlet at the top of the desolventizing tank 3 is connected to the condenser 28 and the solvent recovery tank 29. The evaporated solvent is condensed by the condenser 28 and collected in the solvent recovery tank 29 for recycling.

[0046] In this embodiment, a plurality of spoiler teeth 30 are arranged in the circumferential direction of the gas outlet hole 20, and the holes on two adjacent porous gas distribution plates 21 are arranged in a staggered manner. The above arrangement improves the uniformity of the gas, enables the gas to fully contact with the spray liquid, and improves the gas processing efficiency.

[0047] In this embodiment, a stirring device 31 is provided in the acylation reaction tank 1 , the hydrolysis tank 2 , the desolventizing tank 3 and the distillation tank 11 .

[0048] In addition, it should be understood that after reading the contents taught in the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A device for producing 2-ethylanthraquinone, characterized in that: It comprises an acylation reaction tank, a hydrolysis tank, a desolventizing tank and a closed-loop reaction tank which are connected, wherein the gas outlet of the acylation reaction tank is connected to a first water spray tower, and the liquid outlet of the first water spray tower is connected to the hydrolysis tank; It also includes an extraction buffer tank connected to the closed-loop reaction tank, the overflow port on the top of the extraction buffer tank is connected to the alkali washing tank, and the overflow port on the top of the alkali washing tank is connected to the layering tower, the water washing tower, the distillation tank and the 2-ethylanthraquinone temporary storage tank in sequence; the alkali washing tank is also connected to the alkali liquid temporary storage tank through a pipeline and a valve; the alkali washing tank is provided with a liquid inlet pipe extending into the bottom of the alkali washing tank, and the overflow port of the extraction buffer tank is connected to the alkali washing tank through the liquid inlet pipe; The gas outlets at the tops of the closed-loop reaction tank, the extraction buffer tank and the alkali washing tank are connected to the second water spray tower and the alkali solution spray tower in sequence; The lower parts of the first water spray tower, the second water spray tower and the alkali solution spray tower are all provided with an air distribution plate connected to the air inlet pipe. The air distribution plate includes a shell connected to the air inlet pipe, a plurality of air outlet holes are provided on the top of the shell, and a multi-layer porous air distribution plate is provided in the shell.

2. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: An extraction solvent inlet is arranged at the top of the extraction buffer tank, a feed liquid inlet is arranged at the bottom of the extraction buffer tank, and the closed-loop reaction tank is connected with the extraction buffer tank through the feed liquid inlet.

3. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: The discharge port at the bottom of the extraction buffer tank is connected to the first acid water temporary storage tank through a pipeline and a valve.

4. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: The closed-loop reaction tank is connected to the sulfuric acid temporary storage tank through a pipeline and a valve.

5. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: The liquid outlet of the second water spray tower is connected to the second acid water temporary storage tank; the liquid outlet of the alkali solution spray tower is connected to the waste brine temporary storage tank.

6. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: A premixer and a circulation pump are arranged on the discharge pipe at the bottom of the alkali washing tank. The discharge pipe is connected with the feed end of the liquid inlet pipe through a valve. The alkali solution temporary storage tank is connected with the premixer through a pipe and a valve.

7. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: The gas outlet at the top of the desolventizing tank is connected to the condenser and the solvent recovery tank.

8. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: A plurality of spoiler teeth are arranged circumferentially within the air outlet.

9. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: The holes on two adjacent porous gas distribution plates are arranged in a staggered manner.

10. The device for producing 2-ethylanthraquinone according to claim 1, characterized in that: The acylation reaction tank, the hydrolysis tank, the desolvation tank and the distillation tank are all provided with stirring devices.

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