Acylation reaction device for producing 2-ethyl anthraquinone

Abstract

The utility model discloses an acylation reaction device for producing 2-ethyl anthraquinone, which comprises an acylation reaction kettle, a gas outlet of the acylation reaction kettle is communicated with a first water spray tower through a first condenser, and a liquid outlet of the first water spray tower is communicated with an acid liquor recovery temporary storage tank; a baffle is arranged on the inner wall of the first water spray tower, a spray mechanism is arranged at the upper part of the first water spray tower, the spray mechanism comprises a water inlet pipe and a liquid distribution disc communicated with the water inlet pipe, and a spray head is arranged on the liquid distribution disc; heat conducting fins are arranged on the inner wall of the first condenser, grooves are formed in the surfaces of the heat conducting fins, and a liquid outlet of the first condenser is communicated with the acylation reaction kettle through the drying tank; and the acylation reaction kettle is also communicated with an ethylbenzene metering tank, a phthalic anhydride metering tank and an aluminum trichloride metering tank. According to the device, gas generated by reaction is recycled and is prevented from polluting the atmosphere. The device also effectively separates the material liquid entrained by the gas and returns to the acylation reaction kettle again for treatment, so that the production efficiency of the product is further improved.

Description

Technical Field

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

[0002] 2-Ethylanthraquinone is a light yellow flaky crystal, soluble in organic solvents, with a melting point of 107-111°C. It is mainly used in the manufacture of hydrogen peroxide, dye intermediates, photocurable resin catalysts, photodegradable films, coatings and photosensitive polymerization initiators.

[0003] At present, the synthesis method of 2-ethylanthraquinone mainly produces the intermediate product 2-ethylformylbenzoic acid through acylation reaction and hydrolysis reaction, and then performs desolventization and closed-loop treatment to obtain the target product. However, the following problems often exist in the existing process: a certain amount of acidic gas such as hydrogen chloride will be generated during the acylation process. If it is directly discharged, it will not only waste resources and increase energy consumption, but also pollute the atmosphere. If it is directly treated as tail gas, the processing cost will be greatly increased. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, an acylation reaction device for the production of 2-ethylanthraquinone is provided, the device can effectively spray and absorb the acid gas generated in the acylation process, the recovered acid liquid can be used for the subsequent hydrolysis step, and the production cost of the product is reduced. The device can also effectively separate the feed liquid entrained when the acid gas escapes and return it to the acylation reaction kettle for treatment, further improving the production efficiency of the product.

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

[0006] An acylation reaction device for producing 2-ethylanthraquinone, comprising an acylation reaction kettle, wherein a gas outlet at the top of the acylation reaction kettle is connected to a first water spray tower through a first condenser, and a liquid outlet of the first water spray tower is connected to an acid liquid recovery temporary storage tank; a plurality of baffles are arranged on the inner wall of the first water spray tower, a spray mechanism is arranged on the upper part of the first water spray tower, the spray mechanism comprises a water inlet pipe and a liquid distribution tray connected to the water inlet pipe, and a plurality of spray heads are arranged on the liquid distribution tray;

[0007] The inner wall of the first condenser is provided with a plurality of heat-conducting fins, the surface of the heat-conducting fins is provided with a plurality of grooves, and the liquid outlet of the first condenser is connected with the acylation reaction kettle through the drying tank;

[0008] It also includes an ethylbenzene metering tank, a phthalic anhydride metering tank and an aluminum chloride metering tank which are connected with the feed port of the acylation reactor through pipelines and valves respectively.

[0009] As an improved technical solution, a stirring device is provided in the acylation reaction kettle.

[0010] As an improved technical solution, a gas-liquid filter is provided at the gas outlet of the acylation reactor.

[0011] As an improved technical solution, a plurality of spoiler holes are provided on the baffle.

[0012] As an improved technical solution, an annular baffle is further provided on the outer side of the liquid distribution tray.

[0013] As an improved technical solution, the air outlet at the top of the first water spray tower is connected to the second water spray tower through a second condenser, and the liquid outlet of the second water spray tower is connected to the acid liquid recovery temporary storage tank.

[0014] As an improved technical solution, the structure of the second water spray tower is the same as that of the first water spray tower.

[0015] As an improved technical solution, the second condenser has the same structure as the first condenser.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] (1) The utility model provides an acylation reaction device for producing 2-ethylanthraquinone, comprising an acylation reaction kettle, wherein a gas outlet at the top of the acylation reaction kettle is connected to a first water spray tower via a first condenser, and a liquid outlet of the first water spray tower is connected to an acid liquid recovery temporary storage tank; the above arrangement allows the hydrogen chloride gas generated during the acylation process to be condensed by the first condenser and then enter the first water spray tower for absorption treatment, and the obtained acid liquid enters the acid liquid recovery temporary storage tank, which can be used in the hydrolysis process after subsequent treatment, thereby preventing the acid gas from polluting the atmosphere and reducing the production cost of the product by recycling the gas.

[0018] (2) The inner wall of the first water spray tower of the device is provided with a plurality of baffles, and the upper part of the first water spray tower is provided with a spray mechanism, which includes a water inlet pipe and a liquid distribution tray connected to the water inlet pipe, and a plurality of spray heads are provided on the liquid distribution tray; the combined arrangement of the spray tray and the plurality of baffles facilitates full contact between the gas and water, thereby improving the absorption efficiency of the gas.

[0019] (3) The inner wall of the first condenser of the device is provided with a plurality of heat-conducting fins, and the surface of the heat-conducting fins is provided with a plurality of grooves. The liquid outlet of the first condenser is connected to the acylation reaction kettle through a drying tank; the first condenser can separate the liquid entrained in the gas, and the separated liquid is dried in the drying tank and then enters the acylation reaction kettle for reuse. The combined arrangement of the heat-conducting fins and the grooves improves the condensation efficiency.

[0020] (4) A gas-liquid filter is provided at the gas outlet of the acylation reactor of the device. The gas-liquid filter can initially separate the liquid entrained in the gas, which ensures the purity of the subsequently recovered acid solution on the one hand, and returns the separated liquid to the acylation reactor on the other hand, preventing the loss of the reaction liquid from causing a decrease in product yield.

[0021] (5) The device has a plurality of spoiler holes on the baffle plate, and an annular baffle plate is also provided on the outer side of the liquid distribution plate. The above arrangement ensures that the gas contacts the water and is fully absorbed, thereby improving the gas absorption efficiency.

[0022] (6) The gas outlet at the top of the first water spray tower of the device is connected to the second water spray tower through the second condenser, and the liquid outlet of the second water spray tower is connected to the acid liquid recovery temporary storage tank. The above arrangement realizes multi-stage absorption of gas through the first water spray tower and the second water spray tower, thereby improving the absorption efficiency of gas; and the combined use of the first condenser and the second condenser can, on the one hand, effectively condense the gas for subsequent absorption treatment, and on the other hand, further separate the liquid entrained in the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0025] Figure 2 is a schematic structural diagram of the spray mechanism of Example 1;

[0026] Figure 3 This is a schematic diagram of the internal structure of the first water spray tower in Example 1;

[0027] Figure 4 is a schematic structural diagram of the first condenser of Example 1;

[0028] Figure 5 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0029] In the figure, 1, acylation reactor; 2, gas outlet; 3, first condenser; 4, first water spray tower; 5, second condenser; 6, second water spray tower; 7, acid liquid recovery temporary storage tank; 8, baffle; 9, water inlet pipe; 10, liquid distribution tray; 11, spray head; 12, heat transfer fins; 13, grooves; 14, ethylbenzene metering tank; 15, phthalic anhydride metering tank; 16, aluminum chloride metering tank; 17, stirring device; 18, gas-liquid filter; 19, spoiler holes; 20, annular baffle; 21, drying tank. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Example 1

[0034] like Figures 1 to 5 As shown, an acylation reaction device for producing 2-ethylanthraquinone comprises an acylation reaction kettle 1, a gas outlet 2 at the top of the acylation reaction kettle 1 is connected to a first water spray tower 4 through a first condenser 3, a gas outlet 2 at the top of the first water spray tower 4 is connected to a second water spray tower 6 through a second condenser 5, and liquid outlets of the first water spray tower 4 and the second water spray tower 6 are connected to an acid liquid recovery temporary storage tank 7; the structure of the second water spray tower 6 is the same as that of the first water spray tower 4, a plurality of baffles 8 are arranged on the inner wall of the first water spray tower 4, a spray mechanism is arranged on the upper part of the first water spray tower 4, and the spray mechanism comprises a liquid distribution tray 10 connected to a water inlet pipe 9, and a plurality of spray heads 11 are arranged on the liquid distribution tray 10;

[0035] The structure of the second condenser 5 is the same as that of the first condenser 3. The inner wall of the first condenser 3 is provided with a plurality of heat-conducting fins 12, and the surface of the heat-conducting fins 12 is provided with a plurality of grooves 13. The liquid outlet of the second condenser 5 is connected to the acylation reaction kettle 1 through the drying tank 21;

[0036] It also includes an ethylbenzene metering tank 14, a phthalic anhydride metering tank 15 and an aluminum chloride metering tank 16 which are connected to the feed port of the acylation reaction kettle 1 through pipelines and valves respectively.

[0037] Due to the adoption of the above technical scheme, when the above device is in use, a certain amount of ethylbenzene, aluminum chloride and phthalic anhydride are added into the acylation reaction kettle 1 through the ethylbenzene metering tank 14, the aluminum chloride metering tank 16 and the phthalic anhydride metering tank 15, and the temperature of the acylation reaction is controlled by introducing a heat exchange medium into the jacket of the acylation reaction kettle 1. The gas generated during the reaction is discharged through the gas outlet at the top of the acylation reaction kettle 1, and enters the first water spray tower 4 for absorption treatment after being condensed by the first condenser 3. The unabsorbed gas is discharged through the exhaust port at the top of the first water spray tower 4 and enters the second water spray tower 6 for re-absorption treatment after being condensed by the second condenser 5. The liquid condensed by the first condenser 3 and the second condenser 5 re-enters the acylation reaction kettle 1 for recycling after passing through the drying tank 21.

[0038] In this embodiment, Figure 1 As shown, the acylation reaction kettle 1 is provided with a stirring device 17 , and the reaction materials are fully mixed under the stirring of the stirring device 17 , thereby improving the acylation efficiency.

[0039] In this embodiment, Figure 1 and Figure 5 As shown in the figure, a gas-liquid filter 18 is arranged at the gas outlet 2 of the acylation reaction kettle 1 . The arrangement of the gas-liquid filter 18 can effectively separate the liquid entrained in the gas and let it fall into the liquid in the acylation reaction kettle 1 .

[0040] In this embodiment, Figure 2 and Figure 3 As shown, the baffle plate 8 is provided with a plurality of spoiler holes 19; an annular baffle plate 208 is also provided on the outer side of the liquid distribution plate 10. The above arrangement enables the gas to fully contact and react with water, thereby improving the gas absorption efficiency.

[0041] 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. An acylation reaction device for producing 2-ethylanthraquinone, characterized in that: The invention comprises an acylation reaction kettle, wherein the gas outlet at the top of the acylation reaction kettle is connected to a first water spray tower through a first condenser, and the liquid outlet of the first water spray tower is connected to an acid liquid recovery temporary storage tank; a plurality of baffles are arranged on the inner wall of the first water spray tower, a spray mechanism is arranged on the upper part of the first water spray tower, the spray mechanism comprises a water inlet pipe and a liquid distribution tray connected to the water inlet pipe, and a plurality of spray heads are arranged on the liquid distribution tray; The inner wall of the first condenser is provided with a plurality of heat-conducting fins, the surface of the heat-conducting fins is provided with a plurality of grooves, and the liquid outlet of the first condenser is connected with the acylation reaction kettle through the drying tank; It also includes an ethylbenzene metering tank, a phthalic anhydride metering tank and an aluminum chloride metering tank which are connected with the feed port of the acylation reactor through pipelines and valves respectively.

2. The acylation reaction device for producing 2-ethylanthraquinone according to claim 1, characterized in that: A stirring device is arranged in the acylation reaction kettle.

3. The acylation reaction device for producing 2-ethylanthraquinone according to claim 1, characterized in that: A gas-liquid filter is arranged at the gas outlet of the acylation reaction kettle.

4. The acylation reaction device for producing 2-ethylanthraquinone according to claim 1, characterized in that: The baffle is provided with a plurality of spoiler holes.

5. The acylation reaction device for producing 2-ethylanthraquinone according to claim 1, characterized in that: An annular baffle is also arranged on the outer side of the liquid distribution tray.

6. The acylation reaction device for producing 2-ethylanthraquinone according to claim 1, characterized in that: The gas outlet at the top of the first water spray tower is connected to the second water spray tower through the second condenser, and the liquid outlet of the second water spray tower is connected to the acid solution recovery temporary storage tank.

7. The acylation reaction device for producing 2-ethylanthraquinone according to claim 6, characterized in that: The structure of the second water spray tower is the same as that of the first water spray tower.

8. The acylation reaction device for producing 2-ethylanthraquinone according to claim 6, characterized in that: The second condenser has the same structure as the first condenser.

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