Anthraquinone product residual waste acid washing system

Abstract

The utility model discloses an anthraquinone product residual waste acid washing system, and belongs to the technical field of chemical production devices. The device comprises a dilution tank, a feeding pipe is sequentially connected with the dilution tank, a primary washing tank, a secondary washing tank, a tertiary washing tank and a filter press according to the flow direction of materials to be washed, and a tap water pipe is sequentially connected with the tertiary washing tank, the secondary washing tank, the primary washing tank and the dilution tank according to the flow direction of washing water. The top of the dilution tank is provided with a pressurizing port, the lower part of the dilution tank is provided with a filter plate, and the bottom of the dilution tank is connected with a waste acid tank; the system adopts a mode of combining one dilution tank and a plurality of washing tanks, sequentially conveys cleaning feed liquid, simultaneously sets reverse flow cleaning water, and is matched with the special structural design of the dilution tank, so that residual waste acid in the feed liquid can be continuously diluted, the residual amount of the residual waste acid in a product reaches the standard, the use amount of the washing water is effectively reduced, and the production cost is reduced. The washing cost is reduced; meanwhile, the influence on the environment is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production equipment, in particular to a system for washing residual waste acid of anthraquinone products. Background Art

[0002] Anthraquinone, as an important chemical raw material, is widely used in the fields of medicine, pesticides, dyes, etc. At present, the mainstream method for preparing anthraquinone mostly uses phthalic anhydride and benzene as raw materials, and aluminum chloride as a catalyst to first obtain o-benzoylbenzoic acid through Friedel-Crafts reaction, and then o-benzoylbenzoic acid is dehydrated to generate anthraquinone through concentrated sulfuric acid. This reaction requires the use of a large amount of concentrated sulfuric acid during the dehydration process, and a large amount of waste acid will be present in the reaction solution. Therefore, the post-treatment process of anthraquinone requires multiple washings with clean water to remove residual acid in the product. This process causes the preparation of anthraquinone by the phthalic anhydride method to produce a large amount of acid-containing wastewater, resulting in waste of water resources and pollution to water bodies.

[0003] In order to reduce the amount of water used in the washing process of the anthraquinone product, reduce the output of waste acid, and reduce pollution to the environment, the development of an effective anthraquinone waste acid washing system is of great practical significance for the process of preparing anthraquinone by the phthalic anhydride method. Summary of the Invention

[0004] The purpose of the utility model is to solve the problems raised in the above-mentioned background technology, and to provide a continuous automatic washing system device for anthraquinone waste acid, in which a reverse pipeline for reverse flow washing is arranged so that the washing water can be recycled, thereby effectively reducing the amount of water used in the washing process.

[0005] The technical solution of the utility model is as follows: an anthraquinone waste acid washing system includes a dilution tank, a primary washing tank, a secondary washing tank, and a tertiary washing tank. The feed pipe is connected to the dilution tank, the primary washing tank, the secondary washing tank, the tertiary washing tank, and a filter press in sequence according to the flow direction of the material to be washed. The tap water pipe is connected to the tertiary washing tank, the secondary washing tank, the primary washing tank, and the dilution tank in sequence according to the flow direction of the washing water.

[0006] A pressure port is provided on the top of the dilution tank, a filter plate is provided at the bottom, the bottom is connected to the waste acid tank, and a discharge port connected to the primary washing tank is provided on the tank body above the filter plate.

[0007] In some specific washing systems, the angle between the filter plate and the tank body on the discharge side of the dilution tank is not less than 75°.

[0008] The stirring device on the dilution tank includes a stirring shaft and a stirring paddle connected to the motor, and a soft scraper is provided at the bottom of the stirring paddle.

[0009] In some specific washing systems, an annular air blower is provided above the filter plate in the dilution tank, and the air blower is connected to a plurality of downward blowing nozzles.

[0010] In some specific washing systems, the feed inlets of the primary washing tank, the secondary washing tank and the tertiary washing tank are all located at the top of the tank body, the discharge ports are all located at the bottom of the tank body, the water inlets are all located at the lower part of the tank body, and the water outlets are all located at the upper part of the tank body.

[0011] In some specific washing systems, stirring devices are provided in the primary washing tank, the secondary washing tank and the tertiary washing tank.

[0012] In some specific washing systems, a delivery pump is provided on the feed pipelines of the primary washing tank, the secondary washing tank and the tertiary washing tank.

[0013] In some specific washing systems, the delivery pump adopts a corrosion-resistant pump, and valves are installed on the outlet pipe and inlet pipe of the dilution tank and washing tank.

[0014] In some specific washing systems, the pressure port is connected to a pressure device or a pressure pump, and the annular blower pipe is connected to a fan.

[0015] Some specific washing systems, delivery pumps, valves on all pipelines, all stirring motor pressure pumps, and fans are connected to the PLC control system, and the washing of materials is automatically controlled through the PLC control system.

[0016] Furthermore, the dilution tank and the washing tank are both provided with jackets.

[0017] The dilution tank and the washing tank are each provided with a water outlet at the top of one side of the tank body, and a water inlet at the bottom of the other side of the tank body. The countercurrent water washing pipeline connects the liquid washing tanks in reverse order through the water inlet and outlet. The flow direction of the liquid is opposite to the flow direction of the countercurrent water pipeline, and the connection order is reversed.

[0018] Beneficial effects of the present invention: The present invention provides an anthraquinone waste acid washing system, which sequentially transports the cleaning liquid by combining a liquid dilution tank with a plurality of liquid washing tanks, and simultaneously sets a reverse water pipeline for reverse flow cleaning, thereby continuously diluting the waste acid remaining in the liquid, thereby achieving sufficient washing of the material. At the same time, a filter plate is set inside the dilution tank to filter the diluted reaction liquid, recover the waste acid to the greatest extent, reduce the amount of acid remaining on the product, and make the residual waste acid in the product meet the standard, effectively reducing the amount of washing water used, reducing the washing cost and also reducing the impact on the environment. In addition, the pressure port on the dilution tank can increase the filtration speed, and the soft scraper at the bottom of the blower pipe and the stirring paddle can effectively prevent the material from remaining on the filter plate, thereby maintaining the effective operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of an anthraquinone waste acid washing system.

[0020] Figure 2 for Figure 1 Enlarged structural diagram of the medium dilution tank.

[0021] Among them, 1. dilution tank, 2. primary washing tank, 3. secondary washing tank, 4. tertiary washing tank, 5. first delivery pump, 6. second delivery pump, 7. third delivery pump, 8. fourth delivery pump, 9. filter press, 10. waste acid tank, 100. stirring shaft, 101. stirring paddle, 102. filter plate, 103. air blower, 104. pressurization port.

[0022] Example 1

[0023] A system for washing waste anthraquinone acid includes a dilution tank 1, a primary washing tank 2, a secondary washing tank 3, and a tertiary washing tank 4. The feed ports of the primary washing tank 2, the secondary washing tank 3, and the tertiary washing tank 4 are all located at the top of the tank body, the discharge ports are all located at the bottom of the tank body, the water inlets are all located at the bottom of the tank body, and the water outlets are all located at the top of the tank body. A feed pipe connects the dilution tank 1, the primary washing tank 2, the secondary washing tank 3, the tertiary washing tank 4, and the filter press 9 in sequence according to the flow direction of the material to be washed. A tap water pipe connects the tertiary washing tank 4, the secondary washing tank 3, the primary washing tank 2, and the dilution tank 1 in sequence according to the flow direction of the washing water. A first delivery pump 5, a second delivery pump 6, and a third delivery pump 7 are respectively provided on the feed pipes of the primary washing tank 2, the secondary washing tank 3, and the tertiary washing tank 4. The delivery pumps are corrosion-resistant pumps.

[0024] The dilution tank 1 has a pressurization port 104 at the top, a filter plate 102 at the bottom, and a connection to the waste acid tank 10 at the bottom. A discharge port for the primary washing tank 2 is located above the filter plate 102. The angle between the filter plate 102 and the dilution tank 1 on the discharge side is 10°. A circular air duct 103 is installed above the filter plate 102 within the dilution tank 1. This duct is connected to multiple downward-blowing nozzles. The pressurization port 104 is connected to a pressure pump, and the air inlet of the air duct 103 is connected to a fan.

[0025] The dilution tank 1, the primary washing tank 2, the secondary washing tank 3 and the tertiary washing tank 4 are all provided with stirring devices. The stirring device on the dilution tank 1 comprises a stirring shaft 100 connected to a motor and a stirring paddle 101. A soft scraper is provided at the bottom of the stirring paddle 101.

[0026] The liquid washing tanks are arranged in three groups: a primary washing tank 2, a secondary washing tank 3, and a tertiary washing tank 4. Both the dilution tank and the washing tank are equipped with stirring motors, the lower parts of which are connected to the stirring paddles inside the tanks, generating downward rotation. The liquid delivery pipelines of both the dilution tank 1 and the washing tanks are equipped with delivery pumps. The dilution tank's delivery pipeline is equipped with a first delivery pump 5, the primary washing tank's delivery pipeline is equipped with a second delivery pump 6, the secondary washing tank's delivery pipeline is equipped with a third delivery pump 7, and the tertiary washing tank's delivery pipeline is equipped with a fourth delivery pump 8. The reverse water pipeline includes a tap water delivery pipe and acid-containing washing liquid outlet pipes for the three washing tanks. The tap water delivery pipe is connected to the lower water inlet of the tertiary washing tank, the acid-containing washing liquid outlet pipe at the top of the tertiary washing tank is connected to the lower water inlet of the secondary washing tank, and the acid-containing washing liquid outlet pipe at the top of the secondary washing tank is connected to the lower water inlet of the primary washing tank. The acid-containing washing liquid outlet pipe at the top of the primary washing tank is connected to the water inlet at the top of the dilution tank.

[0027] like Figure 1 As shown, the closed-loop reaction liquid for anthraquinone synthesis enters dilution tank 1 through the feed inlet of the feed dilution tank. It is fully diluted in dilution tank 1 after stirring for 10 minutes. The dilution water is the wash water from the primary wash tank. The diluted reaction solution is pressure-filtered, and the acid-containing wastewater flows through the bottom of the dilution tank into the waste acid tank. The filter cake is then slurried with water and flows from the discharge port of dilution tank 1 to the wastewater washing unit. The anthraquinone settles at the bottom of the wash tank and is then transferred to the next wash tank via a transfer pump through the discharge port. Each wash tank is stirred and washed for 10 minutes. The tertiary washing solution flows from the outlet of primary wash tank 2 to dilution tank 1 for dilution of the feed liquid. The anthraquinone settles at the bottom of the tank and is transferred to the secondary wash tank 3 via a transfer pump through the discharge port for stirring and washing for 10 minutes. The secondary wash liquid flows from the outlet of secondary wash tank 3 to primary wash tank 2, where anthraquinone settles at the bottom of the tank. A transfer pump then delivers the anthraquinone to tertiary wash tank 4 through the outlet, where it is stirred and washed for 10 minutes. The primary wash liquid flows from the outlet of tertiary wash tank 3 to secondary wash tank 3, where anthraquinone settles at the bottom of the tank. A transfer pump then delivers the anthraquinone to filter press 9 through the outlet. Washing water enters the system through the inlet of tertiary wash tank 4, flowing countercurrently with the raw material liquid, to sequentially wash the product. After three washes, the residual acid content in the anthraquinone is less than 1%. During the beating process of the filter cake in the dilution tank, a fan and scraper can be used to increase the beating speed.

[0028] By combining a liquid dilution tank with multiple liquid washing tanks, the cleaning liquid is transported sequentially, and at the same time, a reverse water pipeline for reverse flow cleaning is set up, thereby continuously diluting the waste acid remaining in the liquid, so that the residual waste acid remaining in the product meets the standard, effectively reducing the use of washing water, reducing washing costs and also reducing the impact on the environment.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all variations coming within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0030] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A system for washing residual waste acid of anthraquinone products, comprising a dilution tank (1), a primary washing tank (2), a secondary washing tank (3), and a tertiary washing tank (4), characterized in that: The feed pipe is connected to the dilution tank (1), the primary washing tank (2), the secondary washing tank (3), the tertiary washing tank (4), and the filter press (9) in sequence according to the flow direction of the material to be washed, and the tap water pipe is connected to the tertiary washing tank (4), the secondary washing tank (3), the primary washing tank (2), and the dilution tank (1) in sequence according to the flow direction of the washing water; A pressure port (104) is provided at the top of the dilution tank (1), a filter plate (102) is provided at the bottom, the bottom is connected to the waste acid tank (10), and a discharge port connected to the primary washing tank (2) is provided on the tank body above the filter plate (102).

2. The washing system according to claim 1, characterized in that The angle between the filter plate (102) and the tank body on the discharge port side of the dilution tank (1) is not less than 75°; The stirring device on the dilution tank (1) comprises a stirring shaft (100) connected to a motor and a stirring paddle (101), and a soft scraper is provided at the bottom of the stirring paddle (101).

3. The washing system according to claim 2, characterized in that An annular air blowing pipe (103) is provided above the filter plate (102) in the dilution tank (1), and the air blowing pipe (103) is connected to a plurality of nozzles for blowing air downward.

4. The washing system according to any one of claims 1 to 3, characterized in that: The feed inlets of the primary washing tank (2), the secondary washing tank (3), and the tertiary washing tank (4) are all located at the top of the tank body, the discharge outlets are all located at the bottom of the tank body, the water inlets are all located at the lower part of the tank body, and the water outlets are all located at the upper part of the tank body.

5. The washing system according to any one of claims 1 to 3, characterized in that: A stirring device is provided in each of the primary washing tank (2), the secondary washing tank (3) and the tertiary washing tank (4).

6. The washing system according to any one of claims 1 to 3, characterized in that: Delivery pumps are provided on the feed pipelines of the primary washing tank (2), the secondary washing tank (3), and the tertiary washing tank (4).

7. The washing system according to claim 6, characterized in that: The delivery pump adopts corrosion-resistant pump.

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