2-alkyl anthraquinone waste sulfuric acid decolorizing device

Abstract

The utility model discloses a 2-alkyl anthraquinone waste sulfuric acid decolorizing device, which is characterized in that a sedimentation tank is used for receiving original waste sulfuric acid of an anthraquinone production system and / or an original waste sulfuric acid tank and carrying out settling separation and heat dissipation on the waste sulfuric acid, a filter unit is used for receiving precipitated waste sulfuric acid, a resin adsorption bed is provided with a plurality of resin adsorption columns, and part of the resin adsorption columns are connected in series to adsorb the filtered waste sulfuric acid; qualified sulfuric acid is produced for downstream customers, and enterprise benefits are improved; part of the resin adsorption columns are desorbed and regenerated, so that the sustainability of waste sulfuric acid treatment work is ensured, and the resin adsorption columns are reused in an environment-friendly manner.

Description

Technical Field

[0001] This utility model relates to the production of 2-alkylanthraquinone, and more particularly to a 2-alkylanthraquinone waste sulfuric acid decolorization device. Background Technology

[0002] Currently, most 2-ethylanthraquinone processes use fuming concentrated sulfuric acid as a catalyst. For every ton of 2-ethylanthraquinone produced, 15 tons of waste sulfuric acid are generated. This waste sulfuric acid contains a significant amount of colored organic impurities such as tar, giving it a brown or dark brown color. Tar is an organic mixture containing polycyclic aromatic hydrocarbons, resins, and other components; it is typically dark in color, possibly brown or tan; combined with other impurities, it can appear dark brown or black.

[0003] If the wastewater is discharged after neutralization with alkali, it will generate a large amount of wastewater and waste salt, causing significant environmental pollution.

[0004] On the other hand, waste sulfuric acid containing tar can only be treated as hazardous waste, which is very costly. As a result, many domestic manufacturers have been forced to shut down production because this type of waste sulfuric acid is difficult to handle. Utility Model Content

[0005] The present invention aims to solve at least one of the aforementioned technical problems by providing a 2-alkylanthraquinone waste sulfuric acid decolorization device, which removes impurities and decolorizes waste sulfuric acid, producing qualified sulfuric acid for downstream customers and improving enterprise efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A 2-alkylanthraquinone waste sulfuric acid decolorization device includes a sedimentation tank, a post-precipitation buffer tank, a filtration unit, and a resin adsorption bed. The sedimentation tank is suitable for receiving raw waste sulfuric acid from the anthraquinone production system and / or the original waste sulfuric acid tank, and is suitable for settling suspended solids in the raw waste sulfuric acid and for dissipating heat from the waste sulfuric acid. The post-precipitation buffer tank is suitable for receiving post-precipitation waste sulfuric acid overflowing from the sedimentation tank, and is suitable for dissipating heat from the post-precipitation waste sulfuric acid. The filtration unit is suitable for receiving post-precipitation waste sulfuric acid from the post-precipitation buffer tank, and the resin adsorption bed is suitable for receiving filtered waste sulfuric acid discharged from the filtration unit and producing qualified sulfuric acid.

[0008] Compared with existing technologies, the beneficial effects of this application include: the sedimentation tank not only removes suspended crystals from waste sulfuric acid to a large extent, but also facilitates heat dissipation for filtration and decolorization; sedimentation and filtration effectively remove suspended solids from waste sulfuric acid, ensuring the efficiency and quality of resin decolorization; the combination of sedimentation filtration and resin adsorption changes the color from dark brown to colorless and transparent, producing qualified sulfuric acid for downstream customers and improving enterprise efficiency.

[0009] As an improvement to the above technical solution, the filtration unit includes a bag filter, a multi-media filter and a precision filter connected in series. The bag filter is suitable for receiving post-precipitation waste sulfuric acid from the post-precipitation buffer tank, and the precision filter is suitable for discharging the filtered waste sulfuric acid to the resin adsorption bed.

[0010] As an improvement to the above technical solution, the filtration unit includes a bag filter, a multi-media filter and a precision filter connected in series.

[0011] As an improvement to the above technical solution, at least two filtration units are connected in parallel between the post-precipitation buffer tank and the resin adsorption bed.

[0012] As an improvement to the above technical solution, the resin adsorption bed is provided with at least three resin adsorption columns. Each resin adsorption column has its input end connected to the filter unit via a separate on / off valve, and its output end connected to a qualified acid tank via a separate on / off valve. The at least three resin adsorption columns are connected end-to-end in a loop via separate on / off valves. Each resin adsorption column has its input end connected to a methanol supply tank via a separate on / off valve, and its output end connected to a concentrated desorption storage tank via a separate on / off valve. The concentrated desorption storage tank is suitable for collecting the desorption liquid discharged from the resin adsorption columns. The at least three resin adsorption columns are suitable for activating at least two resin adsorption columns in series for adsorption, and activating resin adsorption columns that are not in operation for desorption or settling.

[0013] As an improvement to the above technical solution, each of the resin adsorption columns has an input end connected to a nitrogen storage tank via a separate on / off valve, and each of the resin adsorption columns has an output end connected to a waste acid buffer tank via a separate on / off valve. The waste acid buffer tank is suitable for collecting the adsorption working residue liquid purged from the resin adsorption columns.

[0014] As an improvement to the above technical solution, each of the resin adsorption columns is connected to a water supply tank via a separate on / off valve at its input end. The waste acid buffer tank is suitable for collecting the adsorption working water flushing liquid discharged from the resin adsorption column. Each of the resin adsorption columns is connected to a dilute desorption storage tank via a separate on / off valve at its output end. The dilute desorption storage tank is suitable for collecting the desorption working water flushing liquid discharged from the resin adsorption column.

[0015] As an improvement to the above technical solution, each resin adsorption column is provided with at least two separate on / off valves connected in parallel between the output end and the dilute desorption tank. The dilute desorption tank is also adapted to fill the resin adsorption column with the desorption working water flushing solution to soak the resin adsorption column.

[0016] As an improvement to the above technical solution, each of the resin adsorption columns has its output end connected to a water washing collection tank via a separate on / off valve. The water washing collection tank is suitable for collecting the water washing wastewater discharged from the resin adsorption columns.

[0017] As an improvement to the above technical solution, each of the resin adsorption columns has at least two separate on / off valves connected in parallel between the output end and the water washing collection tank. The water washing collection tank is also adapted to fill the resin adsorption column with the water washing wastewater in order to flush the analysis process. Attached Figure Description

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of the alkylanthraquinone waste sulfuric acid decolorization device of Embodiment 2 of this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the precipitation section of the 2-alkylanthraquinone waste sulfuric acid decolorization unit is shown.

[0021] Figure 3 for Figure 1 A schematic diagram of the filtration section of a 2-alkylanthraquinone waste sulfuric acid decolorization device is shown.

[0022] Figure 4 for Figure 1 This diagram illustrates the decolorization and analysis process of a 2-alkylanthraquinone waste sulfuric acid decolorization unit.

[0023] Figure 5 This is a flow chart of the waste sulfuric acid decolorization process according to an embodiment of this utility model.

[0024] The accompanying drawings are only one specific embodiment of this utility model, and the form and structure of this specific embodiment should not limit the extension of other embodiments.

[0025] Original waste sulfuric acid tank 100, sedimentation tank 200, post-sedimentation buffer tank 300

[0026] Filter unit 400, bag filter S1, multi-media filter S2 and precision filter S3, resin adsorption column 500,

[0027] Precipitation and cooling step 610, filtration and impurity removal step 620, decolorization step 630.

[0028] The steps are as follows: analysis and regeneration step 640, residual acid purging step 641, residual acid water rinsing step 642, first re-purging step 643, soaking step 644, analysis step 645, residual purging step 646, residual purging step 647, second re-purging step 648, and first water washing step 649. Detailed Implementation

[0029] 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.

[0030] Reference Figures 1 to 4 This invention provides a 2-alkylanthraquinone waste sulfuric acid decolorization device, comprising a sedimentation tank 200, a post-precipitation buffer tank 300, a filter unit 400, and a resin adsorption bed. The sedimentation tank 200 is suitable for receiving the original waste sulfuric acid from the anthraquinone production system and / or the original waste sulfuric acid tank 100. That is, the sedimentation tank 200 directly receives the original waste sulfuric acid from the anthraquinone production system, and / or the anthraquinone production system buffers the original waste sulfuric acid in the original waste sulfuric acid tank 100, from which the original waste sulfuric acid tank 100 supplies the sedimentation tank 200. The original waste sulfuric acid tank 100 is essentially a pre-filtration waste sulfuric acid tank. The primary cooling tank for acid, the sedimentation tank 200 is suitable for settling suspended solids in the original waste sulfuric acid and for cooling the waste sulfuric acid, the post-settling buffer tank 300 is suitable for receiving the post-settling waste sulfuric acid overflowing from the sedimentation tank 200, that is, the sedimentation tank 200 is suitable for overflowing the relatively clear and lower temperature waste sulfuric acid in its tank to the post-settling buffer tank 300, the post-settling buffer tank 300 is suitable for further cooling of the post-settling waste sulfuric acid, the filter unit 400 is suitable for receiving the post-settling waste sulfuric acid from the post-settling buffer tank 300, and the resin adsorption bed is suitable for receiving the filtered waste sulfuric acid discharged from the filter unit 400 and producing qualified sulfuric acid.

[0031] Reference Figure 1 It is understandable that there may be certain height differences between equipment such as the original waste sulfuric acid tank 100, the post-precipitation buffer tank 300, the filter unit 400, and the resin adsorption bed. To ensure the material supply between the equipment, it is standard practice to install pumps for drainage. In order to control the material flow of each piece of equipment, it is standard practice to install on / off valves at the equipment inlets and outlets, as well as between the equipment, such as ball valves, gate valves, and butterfly valves.

[0032] Ideally, the waste sulfuric acid generated from the anthraquinone production system is buffered in waste sulfuric acid tank 100. Waste sulfuric acid is then replenished to sedimentation tank 200 from waste sulfuric acid tank 100 via a throttling device, such as a throttling valve, at a certain flow rate. This ensures stable sedimentation and overflow in sedimentation tank 200, reducing turbulence. Specifically, sedimentation tank 200 has a diameter of 5-20 meters, inlet and outlet pipe diameters of 20-40 cm, and is designed with a length of 9-14 m. 3 The raw waste sulfuric acid supply flow rate of / h enables the sedimentation tank 200 to have both a high sedimentation rate and an overflow rate, thereby improving the company's efficiency.

[0033] It is understandable that the 400 filter unit is essentially a filter. In common filter knowledge, a filter consists of a housing and filter media. The filter media divides the cavity of the housing into a front flow channel (front chamber) and a rear flow channel (rear chamber). The front flow channel (front chamber) is suitable for receiving the pre-filtrate liquid, such as post-precipitation waste sulfuric acid / pre-filtrate waste sulfuric acid, while the rear flow channel (rear chamber) is suitable for collecting the post-filtrate liquid, such as post-filtrate waste sulfuric acid.

[0034] Reference Figure 1 , Figure 4 In the common knowledge of adsorption beds, an adsorption bed includes a packing body. One end of the packing body is suitable for receiving the liquid before impurity removal. When the liquid before impurity removal flows through the packing body, impurities adhere to the packing body, that is, the surface of particles, pits, and pores. The liquid after impurity removal (qualified liquid) flows out from the other end of the packing body.

[0035] The main impurities in the original waste sulfuric acid were tar, other organic matter, and suspended solids. Tar is an organic mixture composed of polycyclic aromatic hydrocarbons, resins, and other components; it is generally dark in color, and may even turn brown or black when combined with other organic matter and suspended solids. The organic matter is mostly colored, such as the most common yellow, including anthraquinone derivatives (yellow or brown), polycyclic aromatic hydrocarbons (yellow or brown), and other organic impurities. (Refer to...) Figure 1 , Figure 5 The operation process of this utility model may include a precipitation and cooling step 610, a filtration and impurity removal step 620, and a decolorization step 630 (i.e., an adsorption step).

[0036] Precipitation and cooling step 610: Raw waste sulfuric acid flows into sedimentation tank 200 and is separated by precipitation in sedimentation tank 200. The precipitate may be unreacted solid raw materials (incompletely reacted anthraquinone compounds), suspended particles of reaction byproducts (anthraquinone polymers), suspended oil / colloidal organic matter, suspended metal oxides or salts, equipment corrosion products, raw material impurities, and other suspended matter (such as carbonaceous particles that may be generated during the production process involving high temperature or oxidation reactions).

[0037] In this invention, the sedimentation tank 200 has a certain volume and liquid level, and the top of the tank is open to facilitate the dissipation of waste sulfuric acid. The cooling of the waste sulfuric acid reduces the solubility of suspended solids, which facilitates the sedimentation of suspended solids. In addition, the cooling of the waste sulfuric acid increases the viscosity and adhesion of impurities such as suspended solids and tar organic matter, which facilitates the filtration unit 400 to filter out residual small suspended solids and facilitates the adhesion of colored organic matter such as tar to the resin filler.

[0038] The sedimentation tank 200 is provided with a discharge port at the bottom, through which suspended solids settled at the bottom of the tank can flow out; and / or, after a certain period of time, the sedimentation tank 200 is emptied and the sedimentation tank 200 is cleaned.

[0039] The sedimentation tank 200 is mainly suitable for settling larger suspended particles, such as suspensions ≥300 micrometers, while the filtration unit 400 further reduces finer suspended particles. In this invention, sedimentation and filtration greatly ensure the impurity adsorption effect of the resin adsorption bed.

[0040] Filtration and impurity removal step 620: The waste sulfuric acid after precipitation is filtered by the filtration unit 400 to stop the small suspended solids. Such as small solid particles, colloids that are difficult to settle, small particulate or colloidal anthraquinone polymer tar, and microcrystals (such as sulfates).

[0041] In this invention, the impurities obtained from precipitation and filtration account for a relatively low proportion of the original waste sulfuric acid, approximately 1%-10%, and are suitable for handling as hazardous materials.

[0042] Precipitation and filtration gradually separate impurities from the waste sulfuric acid, such as the main suspended solids. Therefore, after precipitation and filtration, the waste sulfuric acid loses a certain degree of color, with a color fading rate of about 10%-60%.

[0043] In the original waste sulfuric acid of this invention, inorganic salts, crystals, equipment corrosion products, some unreacted raw materials, and some reaction by-products exist as suspended solids. The remaining impurities in the waste sulfuric acid are basically tar. Therefore, after precipitation and filtration, the filtered waste sulfuric acid is basically organic matter such as tar, mainly tar.

[0044] The resin adsorption bed can be one or more of silica gel resin, macroporous adsorption resin, and ion exchange resin; the packing material of the adsorption bed can be a single resin, such as a honeycomb monolithic structure with several multi-particle packing materials; or the packing material can be multiple resins, each present as particles. Macroporous adsorption resins, such as styrene-divinylbenzene copolymer resin, have large pore sizes and specific surface areas, making them suitable for adsorbing large molecular organic compounds such as tar. Ion exchange resins can be used to adsorb polar substances in tar.

[0045] Decolorization step 630 / Adsorption step: One end of the packing material is suitable for receiving filtered waste sulfuric acid. As the filtered waste sulfuric acid flows through the packing material, tar adheres to the surface of the packing material, i.e., the surface of the particles, pits, and pores. Qualified sulfuric acid (qualified liquid) flows out from the other end of the packing material. This qualified sulfuric acid can be used directly by some enterprises, and is also a suitable raw material for sulfuric acid enterprises, suitable for further purification, impurity removal, distillation, and concentration. This qualified sulfuric acid is also a byproduct of 2-alkylanthraquinone, improving enterprise production efficiency.

[0046] The tar and other organic matter adsorbed by the resin account for a relatively low proportion of the original waste sulfuric acid, approximately 1%-10%. This impurity can be sent to a distillation column to refine related byproducts, such as alkyl anthraquinones, polycyclic aromatic hydrocarbons (PAHs), phenolic compounds, and alkylbenzenes. As described below, this invention also includes a desorption and regeneration step 640. The output end of the resin adsorption bed is connected to the input end of the distillation column. In the desorption and regeneration step, the tar retained by the adsorption bed is discharged, and the tar is then distilled to obtain related byproducts.

[0047] Reference Figure 4 In practice, resin adsorption beds are generally top-in, bottom-out for adsorption; therefore, the lower end of the resin adsorption bed is connected to the inlet of the distillation column. The qualified sulfuric acid obtained from the adsorption step can also be concentrated by distillation to obtain sulfuric acid of different concentrations.

[0048] Compared with the prior art, the beneficial effects of this application include: through the sedimentation tank 200, suspended crystals in waste sulfuric acid are removed to a large extent, and heat dissipation is also facilitated for filtration and decolorization; sedimentation and filtration effectively remove suspended matter in waste sulfuric acid, ensuring the efficiency and quality of resin decolorization; the combination of sedimentation filtration and resin adsorption changes the color from dark brown to colorless and transparent, producing qualified sulfuric acid for downstream customers and improving enterprise efficiency.

[0049] Reference Figure 1 , Figure 2 In some embodiments of this utility model, multiple sedimentation tanks 200 are connected in series. The first sedimentation tank 200 is suitable for receiving waste sulfuric acid from the anthraquinone production system and / or the original waste sulfuric acid tank 100. The next sedimentation tank 200 is suitable for receiving waste sulfuric acid overflowing from the previous sedimentation tank 200. The last sedimentation tank 200 is suitable for overflowing post-precipitation waste sulfuric acid into the post-precipitation buffer tank 300.

[0050] The sedimentation tank 200 and the post-sedimentation buffer tank 300 can be ceramic tanks, graphite tanks, or stainless steel tanks. The outer walls of the ceramic tanks, graphite tanks, and stainless steel tanks are integrally formed with multiple heat dissipation fins distributed circumferentially. The inner wall, inner bottom, outer wall, and outer bottom of the stainless steel tank are covered with a ceramic layer or a graphite layer. The sedimentation tank 200 and the post-sedimentation buffer tank 300 rapidly reduce the temperature of the waste sulfuric acid.

[0051] Reference Figure 1 , Figure 3In some embodiments of this utility model, the filtration unit 400 includes a bag filter S1, a multi-media filter S2, and a precision filter S3 connected in series. The bag filter S1 is suitable for receiving post-precipitation waste sulfuric acid from the post-precipitation buffer tank 300, and the precision filter S3 is suitable for discharging the filtered waste sulfuric acid to the resin adsorption bed, so that the post-precipitation waste sulfuric acid can be fully filtered to remove suspended impurities. It can be understood that the bag filter S1, the multi-media filter S2, and the precision filter S3 belong to coarse filtration, medium filtration, and precision filtration, respectively, with filtration accuracy (i.e., pore size / mesh count) of 1-200 micrometers, 10-50 micrometers, and 0.1-10 micrometers, respectively.

[0052] In bag filter S1, the housing contains the filter bag and a support basket / frame. The support basket / frame supports the filter bag, which acts as the filter media, capturing suspended solids. The filter bag is essentially a textile, and its filtration accuracy is limited to 1-200 micrometers. In multi-media filter S2, the housing is filled with multiple layers of different filter media, such as quartz sand, anthracite, magnetite, and garnet. These filter media are processed to a certain particle size, resulting in a filtration accuracy of 10-50 micrometers for the multi-media filter S2. Furthermore, a support layer is provided inside the housing, typically composed of gravel or ceramic balls, to support the filter media and prevent its loss. In precision filter S3, a housing and a filter element are included. The filter element is made of polypropylene (PP), polytetrafluoroethylene (PTFE), nylon, etc., and can be a wound filter element, melt-blown filter element, pleated filter element, ceramic filter element, etc., resulting in a filtration accuracy of 0.1-10 micrometers for the precision filter S3. To ensure no leakage during operation, O-rings or gaskets are typically used for sealing.

[0053] Reference Figure 1 In some embodiments of this invention, at least two filter units 400 are connected in parallel between the post-precipitation buffer tank 300 and the resin adsorption bed. While one filter unit 400 is performing filtration, the other filter unit 400 can discharge impurities.

[0054] In a filter, the filter media typically divides the housing into an upper chamber and a lower chamber. The upper or middle part of the lower chamber is suitable for introducing the raw liquid, the upper chamber is suitable for discharging the supernatant, and the bottom of the lower chamber is suitable for emptying impurities. Therefore, when the filter stops working, opening the bottom vent will allow the impurities inside the filter to slide out due to their own weight.

[0055] The difference is that in an adsorption column, the actual surface area of ​​the packing material is more complex, such as the surface area of ​​several particles, the surface of pits, the surface of pores, etc., making it more difficult for the adsorption column to empty itself.

[0056] Reference Figure 1 , Figure 4In some embodiments of this utility model, the resin adsorption bed is provided with at least three resin adsorption columns 500. Each resin adsorption column 500 has its input end connected to the filter unit 400 through a separate on / off valve, and its output end connected to the qualified acid tank through a separate on / off valve. The at least three resin adsorption columns 500 are connected end-to-end in a loop through separate on / off valves. Each resin adsorption column 500 has its input end connected to the methanol supply tank through a separate on / off valve, and its output end connected to the concentrated desorption tank through a separate on / off valve. The concentrated desorption tank is suitable for collecting the desorption liquid discharged from the resin adsorption columns 500. The at least three resin adsorption columns 500 are suitable for using at least two resin adsorption columns 500 in series for adsorption, and for using resin adsorption columns 500 that are not in operation for desorption or settling.

[0057] Specific details are available; please refer to them. Figure 1 , Figure 4 The resin adsorption bed is equipped with three resin adsorption columns 500. The operation process of this utility model can be: process (1), (2), (3), (4), and then process (2), (3), (4) are repeated.

[0058] Process (1): A and B resin adsorption columns are connected in series for adsorption, and C resin adsorption column is desorbed or allowed to stand: Specifically, the corresponding on / off valves are opened and closed to allow A and B resin adsorption columns to perform series adsorption, i.e., opening the X shown in the figure. 34A X 48A X 35B X 47B Close the X icon 34B X 34C Therefore, the filtered waste sulfuric acid only flows into resin A adsorption column, not resins B or C. The filtered waste sulfuric acid undergoes at least two adsorption processes to remove impurities, resulting in relatively pure, qualified sulfuric acid. This qualified sulfuric acid then passes through on / off valve X. 47B It is directed to a qualified acid tank.

[0059] Step (2): When resin A adsorption column is saturated, resin B and C adsorption columns are connected in series for adsorption. Specifically, similarly, the corresponding on / off valves are opened and closed to allow resin B and C adsorption columns to perform series adsorption, i.e., opening the X diagram. 34B X 48B X 35C X 47C Close the X icon 34A X 34C Therefore, the filtered waste sulfuric acid only flows into the B resin adsorption column, not the A or C resin adsorption columns. The filtered waste sulfuric acid undergoes at least two adsorption processes to remove impurities, resulting in relatively pure, qualified sulfuric acid. The qualified sulfuric acid then passes through the on / off valve X. 47C It is directed to a qualified acid pool.

[0060] Step (3): When the B resin adsorption column is saturated, the C and A resin adsorption columns are connected in series for adsorption. Specifically, similarly, the corresponding on / off valves are opened and closed to allow the C and A resin adsorption columns to perform series adsorption, i.e., opening the X diagram. 34C X 48C X 35A X 47A Close the X icon 34A X 34B Therefore, the filtered waste sulfuric acid only flows into the C resin adsorption column, not the A or B resin adsorption columns. The filtered waste sulfuric acid undergoes at least two adsorption processes to remove impurities, resulting in relatively pure, qualified sulfuric acid. The qualified sulfuric acid then passes through the on / off valve X. 47A It is directed to a qualified acid pool.

[0061] Step (4): When the C resin adsorption column is saturated, the A and B resin adsorption columns are connected in series for adsorption. Analysis of the C resin adsorption column: Specifically, similarly, the corresponding on / off valves are opened and closed to allow the A and B resin adsorption columns to perform series adsorption, i.e., opening the X shown in the diagram. 34A X 48A X 35B X 47B Close the X icon 34B X 34C Therefore, the filtered waste sulfuric acid only flows into resin A adsorption column, not resins B or C. The filtered waste sulfuric acid undergoes at least two adsorption processes to remove impurities, resulting in relatively pure, qualified sulfuric acid. This qualified sulfuric acid then passes through on / off valve X. 47B It is directed to a qualified acid pool.

[0062] The waste sulfuric acid is treated by repeating the processes (2), (3), and (4) once or multiple times.

[0063] In summary, the operation process shows that, referring to Figure 5 The operation process of this utility model also includes a resolution and regeneration step 640, which includes a resolution process 645, and may even include multiple processes as described below, see reference. Figure 1 , Figure 4 The serial numbers of each on / off valve of the resin adsorption column 500 shown, and the details of each process are described below.

[0064] Reference Figure 4 In the analysis step 645, the resin adsorption column 500, which performs the analysis, is suitable for being filled with methanol liquid. This causes the tar and other impurities originally adhering to the surface of the packing to lose their adhesion and detach from the packing, flowing into the concentrated analysis tank. Therefore, the packing is freed from impurities and regenerated. In the concentrated analysis tank, the analysis liquid mainly consists of methanol and tar components, which are separated into various by-products through distillation.

[0065] It is understandable that containers such as tanks, pools, and boxes are interchangeable when they are only used for storage and supply.

[0066] Reference Figure 4 In some embodiments of this utility model, each resin adsorption column 500 has its input end connected to a nitrogen storage tank via a separate on / off valve, and each resin adsorption column 500 has its output end connected to a waste acid buffer tank via a separate on / off valve. The waste acid buffer tank is suitable for collecting the adsorption residual liquid (i.e., filtered waste sulfuric acid and / or qualified sulfuric acid) purged from the resin adsorption column 500.

[0067] Reference Figure 5 The analysis and regeneration step 640 also includes a residual acid purging step 641 and a residual precipitation purging step 646.

[0068] Before the analysis step 645, there is a residual acid purging step 641; for details, please refer to [link / reference]. Figure 1 , Figure 4 Taking the A resin adsorption column as an example, after the A resin adsorption column is saturated, the input of its waste sulfuric acid is disconnected, leaving residual filtered waste sulfuric acid and / or tar impurities on the surface of the packing. Residual acid purging process 641: Open the on / off valve X. 36A X 46A Nitrogen gas is used to purge the packing material, causing any remaining liquid on the packing material to be discharged into the waste acid buffer tank.

[0069] Reference Figure 5 After the analysis step 645, there is a residual purging step 646; for details, please refer to [link / reference]. Figure 1 , Figure 4 Taking the A resin adsorption column as an example, after the A resin adsorption column completes the desorption step 645, methanol liquid and / or desorption liquid remain on the surface of the packing. Residual purging step 646: Open the on / off valve X. 36A X 44A Nitrogen gas is used to purge the packing material, causing any remaining liquid on the packing material to be discharged into the concentrated desorption tank.

[0070] Reference Figure 4 In some embodiments of this utility model, each resin adsorption column 500 has its input end connected to a water supply tank via a separate on / off valve. The waste acid buffer tank is suitable for collecting the adsorption working water flushing liquid (i.e., waste acid) discharged from the resin adsorption column 500. Each resin adsorption column 500 has its output end connected to a dilute desorption storage tank via a separate on / off valve. The dilute desorption storage tank is suitable for collecting the desorption working water flushing liquid (i.e., dilute desorption liquid) discharged from the resin adsorption column 500.

[0071] Reference Figure 5 Between the residual acid purging process 641 and the analysis process 645, there are successively the residual acid water flushing process 642 and the first re-purging process 643. After the residual analysis purging process 646, there are the residual analysis water flushing process 647 and the second re-purging process 648.

[0072] Reference Figure 4 In some embodiments of this utility model, each resin adsorption column 500 is connected in parallel with at least two separate on / off valves between the output end and the dilute desorption tank. The dilute desorption tank is also suitable for filling the resin adsorption column 500 with desorption working water flushing liquid (i.e. dilute desorption liquid) to soak the resin adsorption column 500.

[0073] Reference Figure 5 Between the first purging step 643 and the analysis step 645, there is a soaking step 644. In the soaking step 644, the analysis working water flushing solution (i.e., dilute analysis solution) can be poured into the resin adsorption column 500 to be analyzed, saving the methanol solution used in the analysis step 645 and reducing enterprise costs. The soaking step 644 and the analysis step 645 produce concentrated analysis solution, which is suitable for discharge into the concentrated analysis storage tank.

[0074] Understandably, referring to Figure 1 , Figure 4 The working flushing fluid (i.e., dilute flushing solution) is used to flush the resin adsorption column 500 from bottom to top. Therefore, based on the actual height / pressure difference, the on / off valve X... 45A Between the dilute descaling storage tank and the on / off valve X 45B Between the dilute desorption storage tank and the on / off valve X 45C A pump may need to be installed between the dilute solution storage tank and the tank.

[0075] Reference Figure 4 In some embodiments of this utility model, each resin adsorption column 500 has its output end connected to a water washing collection tank via a separate on / off valve. The water washing collection tank is suitable for collecting the water washing wastewater discharged from the resin adsorption column 500.

[0076] Reference Figure 5 The second re-purging process 648 is followed by the first washing process 649, and may even include the third re-purging process and the second washing process; the first washing process 649 and the second washing process generate washing wastewater.

[0077] Reference Figure 4 In some embodiments of this utility model, each resin adsorption column 500 is connected in parallel with at least two separate on / off valves between its output end and the water washing collection tank. The water washing collection tank is also suitable for filling the resin adsorption column 500 with water washing wastewater to facilitate rinsing the analysis process.

[0078] In the residual water rinsing process 647, water washing wastewater is poured into the resin adsorption column 500, saving water and reducing enterprise costs.

[0079] In summary, referring to Figure 5The operation process of each resin adsorption column 500 can be sequentially as follows: decolorization step 630 / adsorption step, residual acid purging step 641, residual acid water rinsing step 642, first re-purging step 643, soaking step 644, desorption step 645, residual precipitation purging step 646, residual precipitation water rinsing step 647, second re-purging step 648, first water washing step 649, third re-purging step, second water washing step, and fourth re-purging step.

[0080] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A 2-alkylanthraquinone waste sulfuric acid decolorizing device, characterized by, Comprising: a sedimentation tank adapted to receive raw spent sulfuric acid from an anthraquinone production system and / or a raw spent sulfuric acid tank, the sedimentation tank adapted to settle suspended solids of the raw spent sulfuric acid and adapted to dissipate heat from the raw spent sulfuric acid; a post-sedimentation buffer tank adapted to receive post-sedimentation spent sulfuric acid overflowed from the sedimentation tank, the post-sedimentation buffer tank adapted to dissipate heat from the post-sedimentation spent sulfuric acid; a filtration unit adapted to receive post-sedimentation spent sulfuric acid from the post-sedimentation buffer tank; a resin adsorption bed adapted to receive filtered spent sulfuric acid from the filtration unit and to produce qualified sulfuric acid.

2. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to claim 1, characterized in that, The filtration unit comprises a bag filter, a multi-media filter, and a precision filter connected in series, the bag filter adapted to receive post-sedimentation spent sulfuric acid from the post-sedimentation buffer tank, the precision filter adapted to discharge filtered spent sulfuric acid to the resin adsorption bed.

3. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to claim 1, characterized in that, The filtration unit comprises a bag filter, a multi-media filter, and a precision filter connected in series.

4. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to claim 1, characterized in that, At least two filtration units are connected in parallel between the post-sedimentation buffer tank and the resin adsorption bed.

5. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to any one of claims 1 to 4, characterized in that, The resin adsorption bed is provided with at least three resin adsorption columns, each of the resin adsorption columns having an input end connected to the filtration unit through a separate on-off valve, each of the resin adsorption columns having an output end connected to a qualified acid tank through a separate on-off valve, the at least three resin adsorption columns connected in series through separate on-off valves to form a loop, each of the resin adsorption columns having an input end connected to a methanol supply tank through a separate on-off valve, each of the resin adsorption columns having an output end connected to a concentrated elution storage tank through a separate on-off valve, the concentrated elution storage tank adapted to collect elution liquid discharged from the resin adsorption columns, the at least three resin adsorption columns adapted to call at least two of the resin adsorption columns to perform serial adsorption, and to call the resin adsorption columns not in use to perform elution or standing.

6. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to claim 5, characterized in that, Each of the resin adsorption columns has an input end connected to a nitrogen storage tank through a separate on-off valve, and an output end connected to a spent acid buffer tank through a separate on-off valve, the spent acid buffer tank adapted to collect adsorption residual liquid purged from the resin adsorption columns.

7. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to claim 6, characterized in that, Each of the resin adsorption columns has an input end connected to a water supply tank through a separate on-off valve, the spent acid buffer tank adapted to collect water flushing liquid discharged from the resin adsorption columns, and an output end connected to a dilute elution storage tank through a separate on-off valve, the dilute elution storage tank adapted to collect elution working water flushing liquid discharged from the resin adsorption columns.

8. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to claim 7, characterized in that, Each of the resin adsorption columns has at least two separate on-off valves connected in parallel between the output end and the dilute elution storage tank, and the dilute elution storage tank is further adapted to fill the resin adsorption columns with the elution working water flushing liquid to soak the resin adsorption columns.

9. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to claim 7, characterized in that, Each of the resin adsorption columns has an output end connected to a water washing collection tank through a separate on-off valve, the water washing collection tank adapted to collect water washing waste water discharged from the resin adsorption columns.

10. The 2-alkylanthraquinone spent sulfuric acid decolorizing device according to claim 9, characterized in that, Each of the resin adsorption columns has at least two separate on-off valves connected in parallel between the output end and the water washing collection tank, and the water washing collection tank is further adapted to fill the resin adsorption columns with the water washing waste water to facilitate water flushing for elution working.

Images