A continuous-feed reactor for producing o-aminophenol

Abstract

This utility model discloses a continuous-feed reaction apparatus for producing o-aminophenol, comprising a raw material storage tank, a primary storage tank, a liquid alkali storage tank, a shut-off valve, a primary reactor, an elevated tank, a feed pump, a secondary reactor, a hydrogen storage tank, a hydrogen booster pump, a filter, a material receiving tank, a material degassing tank, a nitrogen storage tank, and an acid precipitation vessel. The outlet of the raw material storage tank is connected to the primary storage tank via a pipeline. The side outlet of the primary storage tank is connected to the primary reactor via a pipeline and the liquid alkali storage tank. The side outlet of the primary reactor is connected to the inlet of the elevated tank via a pipeline. This utility model adopts a continuous-feed method, allowing the hydrolysis and reduction reactions to proceed continuously. This method can improve the reaction yield and efficiency, maximize the utilization of o-nitrochlorobenzene raw material, save economic costs, and reduce environmental pollution, conforming to the concept of green chemistry and possessing strong practicality.

Description

Technical Field

[0001] This utility model relates to the field of chemical machinery technology, specifically to a continuous-feed reaction device for producing o-aminophenol. Background Technology

[0002] o-Aminophenol is an important chemical intermediate widely used in dyes, pharmaceuticals, and printing. The traditional method involves hydrolysis and reduction with iron powder using o-nitrochlorobenzene as a starting material. However, this method results in the product being encased in iron sludge, leading to low yields. Removing the iron sludge is also cumbersome and causes serious environmental pollution. Therefore, developing a simple, high-yield, and low-pollution reaction apparatus for producing o-aminophenol is of great significance. Utility Model Content

[0003] The purpose of this invention is to provide a continuous feeding reaction apparatus for producing o-aminophenol, in order to solve the problems mentioned in the background art. The existing traditional method uses o-nitrochlorobenzene as a starting material and obtains it through hydrolysis and iron powder reduction. The product obtained by this method is encased in iron sludge, resulting in low product yield. The process of removing the iron sludge is cumbersome and causes serious environmental pollution.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a continuous feeding reaction device for producing o-aminophenol, comprising a raw material storage tank, a primary storage tank, a liquid alkali storage tank, a shut-off valve, a primary reactor, an elevated tank, a feed pump, a secondary reactor, a hydrogen storage tank, a hydrogen booster pump, a filter, a material receiving tank, a material degassing tank, a nitrogen storage tank, and an acid precipitation kettle;

[0005] The outlet of the raw material storage tank is connected to the primary storage tank via a pipeline. The side outlet of the primary storage tank is connected to the primary reactor via a pipeline and the liquid alkali storage tank. The side outlet of the primary reactor is connected to the inlet of the high-level tank via a pipeline. The bottom outlet of the high-level tank is connected to the secondary reactor via a pipeline. The lower air inlet of the secondary reactor is connected to a hydrogen storage tank and a hydrogen booster pump.

[0006] The secondary reactor is connected to a material receiving tank via a pipe on its side, and a filter is installed in the pipe between the secondary reactor and the material receiving tank. The secondary reactor is connected to the upper inlet of the material receiving tank via a pipe containing the filter. The lower outlet of the material receiving tank is connected to a material degassing tank via a pipe. The material degassing tank is connected to a nitrogen storage tank and an acid precipitation vessel via pipes. Feed pumps are installed on the pipes between the high-level tank and the secondary reactor, and between the material degassing tank and the acid precipitation vessel.

[0007] Preferably, the raw material storage tank, primary storage tank, liquid alkali storage tank, material receiving tank, material degassing tank, and acid precipitation kettle are all equipped with external level gauges and side sight glasses.

[0008] Preferably, a rotor flow meter is installed between the lower outlet of the high-level tank and the feed pump.

[0009] Preferably, there are at least two material receiving tanks, and the top of each material receiving tank is provided with a high-altitude exhaust port.

[0010] Preferably, the inlet and outlet of the primary reactor, secondary reactor, material receiving tank, material degassing tank, nitrogen storage tank, and acid precipitation kettle are all equipped with shut-off valves to facilitate the control of the on / off status of each device at any time.

[0011] Preferably, the feed pump has a booster function.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the continuous feeding reaction device for producing o-aminophenol allows the hydrolysis reaction and reduction reaction to proceed continuously by adopting a continuous feeding method; this method can improve the yield and efficiency of the reaction, maximize the utilization of o-nitrochlorobenzene raw material, save economic costs, and reduce environmental pollution, which is in line with the concept of green chemistry and has strong practicality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the continuous addition reaction device for producing o-aminophenol according to this utility model.

[0014] In the diagram: 1. Raw material storage tank; 2. Primary storage tank; 3. Liquid alkali storage tank; 4. Shut-off valve; 5. Primary reactor; 6. High-level tank; 7. Feed pump; 8. Secondary reactor; 9. Hydrogen storage tank; 10. Hydrogen booster pump; 11. Filter; 12. Material receiving tank; 13. Material degassing tank; 14. Nitrogen storage tank; 15. Acid precipitation vessel. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 The present invention provides an embodiment of a continuous feeding reaction device for producing o-aminophenol, comprising a raw material storage tank 1, a primary storage tank 2, a liquid alkali storage tank 3, a shut-off valve 4, a primary reactor 5, an elevated tank 6, a feed pump 7, a secondary reactor 8, a hydrogen storage tank 9, a hydrogen booster pump 10, a filter 11, a material receiving tank 12, a material degassing tank 13, a nitrogen storage tank 14, and an acid precipitation kettle 15.

[0017] The outlet of raw material storage tank 1 is connected to primary storage tank 2 via a pipeline. The side outlet of primary storage tank 2 is connected to primary reactor 5 via a pipeline and liquid alkali storage tank 3. The side outlet of primary reactor 5 is connected to the inlet of high-level tank 6 via a pipeline. The bottom outlet of high-level tank 6 is connected to secondary reactor 8 via a pipeline. The lower air inlet of secondary reactor 8 is connected to hydrogen storage tank 9 and hydrogen booster pump 10.

[0018] The secondary reactor 8 is connected to a material receiving tank 12 via a pipe on its side. There are at least two material receiving tanks 12, and each material receiving tank 12 has a high-altitude exhaust port at its top for exhaust. A filter 11 is installed in the pipe between the secondary reactor 8 and the material receiving tank 12. The secondary reactor 8 is connected to the upper inlet of the material receiving tank 12 via a pipe containing the filter 11. The lower outlet of the material receiving tank 12 is connected to a material degassing tank 13 via a pipe. The material degassing tank 13 is connected to a nitrogen storage tank 14 and an acid precipitation vessel 15 via pipes. A feed pump 7 is installed on the pipes between the high-level tank 6 and the secondary reactor 8, and between the material degassing tank 13 and the acid precipitation vessel 15. A rotor flow meter is installed between the lower outlet of the high-level tank 6 and the feed pump 7 to observe the flow rate. The feed pump 7 has a pressurization function, and the function of the feed pump 7 is limited. The feed pump 7 can be pressurized.

[0019] External level gauges and side sight glasses are installed on raw material storage tank 1, primary storage tank 2, liquid alkali storage tank 3, material receiving tank 12, material degassing tank 13, and acid precipitation kettle 15. Shut-off valves 4 are installed at the inlet and outlet of primary reactor 5, secondary reactor 8, material receiving tank 12, material degassing tank 13, nitrogen storage tank 14, and acid precipitation kettle 15 to facilitate the control of the on / off status of each device at any time.

[0020] Working principle: This continuous-feed reactor for producing o-aminophenol uses a continuous-feeding method to allow the hydrolysis and reduction reactions to proceed continuously, which can improve the yield and efficiency of the reaction while reducing environmental pollution.

[0021] First, o-nitrochlorobenzene and liquid alkali raw materials enter the primary reactor 5 through raw material storage tank 1 and liquid alkali storage tank 3, respectively. They are then transported through pipelines to the high-level tank 6, exiting through the lower outlet of the high-level tank 6 and being pumped by the feed pump 7 to the secondary reactor 8. Hydrogen gas from hydrogen storage tank 9 is pressurized by hydrogen booster pump 10 and enters the secondary reactor 8 through the lower inlet. Under the catalytic conditions of a pre-installed catalyst in the secondary reactor 8, the hydrogen gas mixes with the reaction liquid, reducing o-nitrophenol to o-aminophenol. The completely reacted material is then transported through the pre-installed catalyst... The pipeline of catalyst filter 11 enters material receiving tank 12, whose internal pressure is equal to the working pressure of the reaction tower. After the residual hydrogen pressure is released, it enters material degassing tank 13 from the lower outlet of material receiving tank 12. Nitrogen in nitrogen storage tank 14 enters through the lower inlet of material degassing tank 13 and removes dissolved hydrogen from the material. After the exhaust is completed, the material in material degassing tank 13 is transferred to acid precipitation tank 15 through its lower outlet via feed pump 7 for subsequent processes. Shut-off valves 4 are installed at the inlet and outlet of the device to facilitate the control of the on / off status of each device at any time.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0023] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. A continuous feed reactor for producing o-aminophenol, comprising a raw material storage tank (1), a primary storage tank (2), a liquid alkali storage tank (3), a shut-off valve (4), a primary reactor (5), an elevated tank (6), a feed pump (7), a secondary reactor (8), a hydrogen storage tank (9), a hydrogen booster pump (10), a filter (11), a material receiving tank (12), a material degassing tank (13), a nitrogen storage tank (14), and an acid precipitation vessel (15), characterized in that: The outlet of the raw material storage tank (1) is connected to the primary storage tank (2) through a pipe. The side outlet of the primary storage tank (2) is connected to the primary reactor (5) through a pipe and the liquid alkali storage tank (3). The side outlet of the primary reactor (5) is connected to the inlet of the high-level tank (6) through a pipe. The bottom outlet of the high-level tank (6) is connected to the secondary reactor (8) through a pipe. The lower air inlet of the secondary reactor (8) is connected to a hydrogen storage tank (9) and a hydrogen booster pump (10). The secondary reactor (8) is connected to a material receiving tank (12) via a pipe on its side. A filter (11) is installed in the pipe between the secondary reactor (8) and the material receiving tank (12). The secondary reactor (8) is connected to the upper inlet of the material receiving tank (12) via a pipe containing the filter (11). The lower outlet of the material receiving tank (12) is connected to a material degassing tank (13) via a pipe. The material degassing tank (13) is connected to a nitrogen storage tank (14) and an acid precipitation vessel (15) via pipes. A feed pump (7) is installed on the pipes between the high-level tank (6) and the secondary reactor (8) and between the material degassing tank (13) and the acid precipitation vessel (15).

2. The apparatus for producing o-aminophenol according to claim 1, wherein: The raw material storage tank (1), primary storage tank (2), liquid alkali storage tank (3), material receiving tank (12), material degassing tank (13), and acid precipitation kettle (15) are all equipped with external level gauges and side sight glasses.

3. The apparatus for producing o-aminophenol according to claim 1, wherein: A rotor flow meter is installed between the lower outlet of the high-level tank (6) and the feed pump (7).

4. The apparatus for producing o-aminophenol according to claim 1, wherein: There are at least two material receiving tanks (12), and the top of the material receiving tank (12) is provided with a high-altitude exhaust port.

5. The apparatus for producing o-aminophenol according to claim 1, wherein: The inlet and outlet of the primary reactor (5), secondary reactor (8), material receiving tank (12), material degassing tank (13), nitrogen storage tank (14) and acid precipitation vessel (15) are all equipped with shut-off valves (4).

6. The apparatus for producing o-aminophenol according to claim 1, wherein: The feed pump (7) has a booster function.

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