Green cleaning system in adipic acid production process

Abstract

The utility model discloses a green cleaning system in an adipic acid production process. The green cleaning system comprises a carbon filter, a filtrate receiving tank, a waste carbon filter, an adipic acid slurry tank, a hot high-purity water tank, a hot mother liquor tank, a plurality of electromagnetic valves and a pressure gauge. A hot mother liquor cleaning and high-purity water cleaning electromagnetic valve is arranged on the feeding pipeline, a compressed air electromagnetic valve is arranged above the carbon filter, a discharge electromagnetic valve is arranged below the carbon filter, and the automatic cleaning system is changed through a pressure gauge and front and back liquid levels. According to the utility model, the hot high-purity water tank and the automatic cleaning procedure are added, so that the cleaned high-purity water directly enters the trench without influencing the total nitrogen content, and the sewage treatment pressure is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of adipic acid production equipment, and in particular relates to a green cleaning system in adipic acid production process. Background Art

[0002] In adipic acid production, an oxidation reaction generates an adipic acid solution. This solution then undergoes a series of steps, including crystallization, separation, dissolution, decolorization, filtration, recrystallization, and further separation, to yield qualified purified adipic acid. The adipic acid solution generated by the oxidation reaction, after separation and washing, contains a small amount of colored impurities. These impurities need to be removed by adding activated carbon to the solution to absorb them. Once the impurities in the adipic acid solution are adsorbed by the activated carbon, the activated carbon loses its activity and becomes waste, simultaneously adding new impurities to the adipic acid solution. Therefore, to meet the quality requirements of the adipic acid product, this waste activated carbon must be removed.

[0003] In adipic acid production, existing technologies for removing spent activated carbon typically involve washing with hot mother liquor followed by pressurized removal of the activated carbon. However, this has the disadvantage that the hot mother liquor used for cleaning and removing the activated carbon contains some adipic acid solution. This hot mother liquor, discharged into the sewer after washing, increases the total nitrogen content in the sewer and increases wastewater treatment costs. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a green cleaning system for the adipic acid production process, which adds a hot high-purity water tank and an automatic cleaning program. The high-purity water after cleaning directly enters the ditch without affecting the total nitrogen content, thereby reducing the pressure on sewage treatment.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A green cleaning system for an adipic acid production process includes a carbon filter, a filtrate receiving tank, and a waste carbon filter. The carbon filter is connected to the filtrate receiving tank via a pipeline. The bottom of the carbon filter is connected to the waste carbon filter via a pipeline. The bottom of the waste carbon filter is connected to a wastewater discharge pipeline.

[0007] The inlet of the carbon filter is connected to the adipic acid slurry tank through a feed pipeline, and an adipic acid slurry pump and a feed solenoid valve are provided on the feed pipeline. The hot mother liquor tank is connected to the feed pipeline through a pipeline, and a hot mother liquor delivery pump and a hot mother cleaning liquid solenoid valve are provided on the connecting pipeline of the hot mother liquor tank. The hot high-purity water tank is connected to the feed pipeline through a pipeline, and a hot high-purity water delivery pump and a high-purity water cleaning solenoid valve are provided on the connecting pipeline of the hot high-purity water tank.

[0008] Furthermore, a compressed air pipeline is provided above the carbon filter, a compressed air solenoid valve is provided on the compressed air pipeline, and a discharge solenoid valve and a pressure gauge are provided on the pipeline between the carbon filter and the filtrate receiving tank.

[0009] Furthermore, a discharge solenoid valve is provided on the wastewater discharge pipeline, an overflow port is opened on the upper side of the waste carbon filter, the overflow port is connected to an overflow pipeline, and the overflow pipeline is connected to the wastewater discharge pipeline.

[0010] Furthermore, the carbon filter is a candle-shaped filter, which is provided with a plurality of filter elements, each element being covered with a polypropylene filter cloth, and the filtration accuracy is 1 μm.

[0011] Furthermore, the waste carbon filter is a conical filter with a metal filter mesh provided at the bottom and a polypropylene filter cloth provided above the metal filter mesh, and the filtration accuracy is 1 μm.

[0012] The beneficial effects of the utility model are as follows: a hot high-purity water tank and an automatic cleaning program are added on the original basis, and the high-purity water after cleaning directly enters the ditch without affecting the total nitrogen content, thereby reducing the pressure on sewage treatment; an overflow port is opened on the upper side of the waste carbon filter and is connected to the wastewater discharge pipeline to ensure that the tank will not overflow, thereby avoiding environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the green cleaning system in the adipic acid production process described in Example 1.

[0014] In the figure: 1. Carbon filter; 2. Filtrate receiving tank; 3. Waste carbon filter; 4. Feed solenoid valve; 5. Discharge solenoid valve; 6. Compressed air solenoid valve; 7. High-purity water cleaning solenoid valve; 8. Hot mother liquor cleaning solenoid valve; 9. Discharge solenoid valve; 10. Hot mother liquor tank; 11. Hot high-purity water tank; 12. Compressed air pipeline; 13. Adipic acid slurry tank; 14. Pressure gauge; 15. Slurry pipe delivery pump; 16. Hot high-purity water delivery pump; 17. Hot mother liquor delivery pump. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] Example 1

[0017] like Figure 1As shown, the green cleaning system in the adipic acid production process provided by the present invention includes a carbon filter 1, a filtrate receiving tank 2 and a waste carbon filter 3. The carbon filter 1 is connected to the filtrate receiving tank 2 through a pipeline. The carbon filter 1 is a candle-shaped filter with multiple filter elements. Each element is covered with a polypropylene filter cloth with a filtration accuracy of 1 μm as a filter cover. After the liquid treated with activated carbon passes through the filter medium, it becomes a refined adipic acid solution and enters the filtrate receiving tank 2.

[0018] The bottom of the carbon filter 1 is connected to the waste carbon filter 3 through a pipeline, and a discharge solenoid valve 9 is provided on the pipeline. The waste carbon filter 3 is a conical filter, and a metal filter screen is provided at the bottom. A polypropylene filter cloth with a filtration accuracy of 1 μm is provided above the metal filter screen to prevent waste carbon from entering the ditch. The bottom of the waste carbon filter 3 is connected to a wastewater discharge pipeline, and an overflow port is provided above the side of the waste carbon filter 3. The overflow port is connected to an overflow pipeline, and the overflow pipeline is connected to the wastewater discharge pipeline to prevent the tank from bubbling; a compressed air pipeline 12 is provided above the carbon filter 1, and a compressed air solenoid valve 6 is provided on the compressed air pipeline 12. A discharge solenoid valve 5 and a pressure gauge 14 are provided on the pipeline between the carbon filter 1 and the filtrate receiving tank 2;

[0019] The left side of the carbon filter 1 is connected to the adipic acid slurry tank 13 through a feed pipeline, and a slurry delivery pump 15 and a feed solenoid valve 4 are provided on the feed pipeline. The hot mother liquor tank 10 is connected to the feed pipeline through a pipeline, and a hot mother liquor delivery pump 17 and a hot mother cleaning liquid solenoid valve 8 are provided on the pipeline. The hot high-purity water tank 11 is connected to the feed pipeline through a pipeline, and a hot high-purity water delivery pump 16 and a high-purity water cleaning solenoid valve 7 are provided on the pipeline.

[0020] During use, the slurry containing about 42% adipic acid (containing activated carbon) in the adipic acid slurry tank 13 is delivered to the carbon filter 1 through the slurry delivery pump 15, the discharge solenoid valve 5 is opened, and the material after carbon removal filtration is delivered to the filtrate receiving tank 2; when the pressure of the pressure gauge 14 decreases, the liquid level in the filtrate receiving tank 2 decreases, and the liquid level of the front system increases, cleaning is performed. Put the automatic cleaning program TM1 into use, close the feed solenoid valve 4, open the hot mother liquor solenoid valve 8 and the discharge solenoid valve 5 (the solenoid valve is not mentioned in the closed state below) to perform the first step of cleaning for 10 minutes, then close the hot mother liquor solenoid valve 8, open the high-purity water solenoid valve 7 to perform the second step of cleaning for 5 minutes, then close the discharge solenoid valve 5, open the compressed air solenoid valve 6 for pressurization, when the pressure gauge 14 rises by 0.5MPa, open the discharge solenoid valve 9 to discharge the waste carbon and high-purity water into the waste carbon filter 3, the waste carbon is retained on the waste carbon filter 3, and the high-purity water is filtered through the filter cloth and discharged into the ditch, finally open the feed solenoid valve 4, the material enters the carbon filter 1, open the discharge solenoid valve 5 to transport the decarbonized material to the filtrate receiving tank 2, the cleaning program is completed, and the system operates normally.

[0021] The utility model adds a hot high-purity water tank and an automatic cleaning program. The high-purity water after cleaning directly enters the ditch without affecting the total nitrogen content, reducing the pressure of sewage treatment. An overflow port is opened on the upper side of the waste carbon filter and is connected to the wastewater discharge pipeline to ensure that there will be no tank overflow and avoid environmental pollution.

[0022] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] In this utility model, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, these terms may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships typically used when the utility model product is in use. These terms are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second," etc., are used solely for distinction and should not be construed as indicating or implying relative importance.

Claims

1. A green cleaning system in adipic acid production process, comprising a carbon filter, a filtrate receiving tank and a waste carbon filter, characterized in that: The carbon filter is connected to the filtrate receiving tank through a pipeline, the bottom of the carbon filter is connected to the waste carbon filter through a pipeline, and the bottom of the waste carbon filter is connected to a wastewater discharge pipeline; The inlet of the carbon filter is connected to the adipic acid slurry tank through a feed pipeline, and an adipic acid slurry pump and a feed solenoid valve are provided on the feed pipeline. The hot mother liquor tank is connected to the feed pipeline through a pipeline, and a hot mother liquor delivery pump and a hot mother liquor cleaning liquid solenoid valve are provided on the connecting pipeline of the hot mother liquor tank. The hot high-purity water tank is connected to the feed pipeline through a pipeline, and a hot high-purity water delivery pump and a high-purity water cleaning solenoid valve are provided on the connecting pipeline of the hot high-purity water tank.

2. The cleaning system according to claim 1, characterized in that: A compressed air pipeline is arranged above the carbon filter, a compressed air solenoid valve is arranged on the compressed air pipeline, and a discharge solenoid valve and a pressure gauge are arranged on the pipeline between the carbon filter and the filtrate receiving tank.

3. The cleaning system according to claim 1, characterized in that: A discharge solenoid valve is arranged on the wastewater discharge pipeline, an overflow port is opened on the upper side of the waste carbon filter, the overflow port is connected to an overflow pipeline, and the overflow pipeline is connected to the wastewater discharge pipeline.

4. The cleaning system according to claim 1, characterized in that: The carbon filter is a candle-shaped filter with multiple filter elements inside. Each element is covered with a polypropylene filter cloth with a filtration accuracy of 1μm.

5. The cleaning system according to claim 1, characterized in that: The waste carbon filter is a conical filter with a metal filter mesh at the bottom and a polypropylene filter cloth above the metal filter mesh, and the filtering accuracy is 1μm.

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