Device for recycling discharged water in hydrogen peroxide production

Abstract

A device for recycling discharge water in hydrogen peroxide production comprises a discharge water collecting tank, a first water pump communicated with the discharge water collecting tank, a primary filter communicated with the first water pump, a buffer tank for receiving filtrate of the primary filter, and a second water pump communicated with the buffer tank, the sand filter is communicated with the second water pump, the third water pump is communicated with the sand filter, the secondary filter is communicated with the third water pump, the primary reverse osmosis membrane processor is communicated with the secondary filter, and the secondary reverse osmosis membrane processor is communicated with the primary reverse osmosis membrane processor. And the third-stage reverse osmosis membrane processor is communicated with the second-stage reverse osmosis membrane processor. According to the technical scheme provided by the utility model, heavy aromatics, trioctyl phosphate, alkyl anthraquinone, degradation products of alkyl anthraquinone and the like in discharged water in hydrogen peroxide production can be effectively removed; the water consumption in the hydrogen peroxide production process can be reduced, and the development of a hydrogen peroxide production water-saving technology is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen peroxide production, in particular to a device for recycling discharged water from hydrogen peroxide production, which can recycle clean wastewater discharged during the hydrogen peroxide production process. Background Art

[0002] Circulating water refers to water that is recycled and reused during industrial production processes. It does not require frequent replacement, saving water resources and reducing pollutant emissions. It is widely used in industries such as steel, petrochemicals, electronics, textiles, and papermaking.

[0003] Hydrogen peroxide production consumes a significant amount of water, leading most manufacturers to adopt industrial circulating water treatment technology. Practice has proven that implementing this technology can save significant amounts of industrial water, leading to corresponding reductions in water and sewage charges. Circulating water is constantly recycled, so impurities and pollutants accumulate over time, reducing its efficiency and quality. Production practices regularly discharge substandard circulating water or discard reusable water for treatment. Furthermore, some circulating water is used for mechanical seal cooling, and some steam condensate is directly discharged into the sewer. This increases the load on wastewater treatment plants and increases water consumption. Therefore, it is essential to treat and recycle discharged clean wastewater.

[0004] Existing technologies for treating and reusing circulating water include mechanical filtration, sedimentation, chemical dosing, biological treatment, and physicochemical treatment. Mechanical filtration primarily removes large impurities; sedimentation removes suspended and precipitated particles; chemical dosing removes difficult-to-remove contaminants such as organic matter and heavy metal ions; biological treatment primarily uses microorganisms to degrade organic matter into inorganic compounds; and physicochemical treatment includes various processes such as oxidation, reduction, precipitation, and adsorption.

[0005] The clean wastewater from hydrogen peroxide production is easily contaminated by leakage of the working fluid. Its components include heavy aromatic hydrocarbons, trioctyl phosphate, alkyl anthraquinone and its degradation products. The existing circulating water treatment and reuse technology has not yet achieved good results in removing these substances.

[0006] Therefore, if a device for recycling hydrogen peroxide production discharge water can be developed, which can remove heavy aromatic hydrocarbons, trioctyl phosphate, alkyl anthraquinone and its degradation products in the circulating water discharge water, it will surely save the amount of water used in the hydrogen peroxide production process and greatly promote the development of hydrogen peroxide production technology. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a device for recycling discharge water from hydrogen peroxide production, which can remove heavy aromatic hydrocarbons, trioctyl phosphate, alkyl anthraquinone and its degradation products from water such as mechanical seal cooling water, steam condensate, and bottom discharge water of circulating water pool, thereby improving the water quality of circulating water and achieving the purpose of saving water.

[0008] In order to solve the above technical problems, the utility model provides a device for reusing discharge water from hydrogen peroxide production, comprising a discharge water collecting tank, a first water pump whose water inlet is connected to the discharge water collecting tank, a primary filter whose water inlet is connected to the water outlet of the first water pump, a buffer tank for receiving filtrate from the primary filter, a second water pump whose water inlet is connected to the buffer tank, a sand filter whose water inlet is connected to the water outlet of the second water pump, a third water pump whose water inlet is connected to the sand filter, a secondary filter whose water inlet is connected to the water outlet of the third water pump, a primary reverse osmosis membrane processor whose liquid inlet is connected to the liquid outlet of the secondary filter, a secondary reverse osmosis membrane processor whose liquid inlet is connected to the concentrated liquid outlet of the primary reverse osmosis membrane processor, and a tertiary reverse osmosis membrane processor whose liquid inlet is connected to the concentrated liquid outlet of the secondary reverse osmosis membrane processor; the permeates of the primary reverse osmosis membrane processor, the secondary reverse osmosis membrane processor and the tertiary reverse osmosis membrane processor are all reused in the circulating water for hydrogen peroxide production.

[0009] As a further improved technical solution, the utility model provides a device for reusing discharge water from hydrogen peroxide production, wherein the reverse osmosis membrane area of the first-stage reverse osmosis membrane processor is greater than that of the second-stage reverse osmosis membrane processor; the reverse osmosis membrane area of the second-stage reverse osmosis membrane processor is greater than that of the third-stage reverse osmosis membrane processor; the first-stage reverse osmosis membrane processor, the second-stage reverse osmosis membrane processor and the third-stage reverse osmosis membrane processor all use RO reverse osmosis membranes.

[0010] This utility model provides a technical solution that utilizes three reverse osmosis membrane treatment systems in series, achieving a high water reuse rate and effectively removing heavy aromatics, trioctyl phosphate, alkyl anthraquinone, and their degradation products from the circulating water used in hydrogen peroxide production. This reduces water usage during hydrogen peroxide production and promotes the development of water-saving technologies for hydrogen peroxide production. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention but do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0012] Figure 1 The structure diagram of the device for recycling the discharged water from hydrogen peroxide production is shown in the embodiment. Implementation Method

[0013] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0014] like Figure 1 The device shown for reusing discharge water from hydrogen peroxide production includes a discharge water collection tank 1, a first water pump 2 whose water inlet is connected to the discharge water collection tank 1, a primary filter 3 whose water inlet is connected to the water outlet of the first water pump 2, a buffer tank 4 for receiving the filtrate of the primary filter 3, a second water pump 5 whose water inlet is connected to the buffer tank 4, a sand filter 6 whose water inlet is connected to the water outlet of the second water pump 5, a third water pump 7 whose water inlet is connected to the sand filter 6, a secondary filter 8 whose water inlet is connected to the water outlet of the third water pump 7, a primary reverse osmosis membrane processor 9 whose liquid inlet is connected to the liquid outlet of the secondary filter 8, a secondary reverse osmosis membrane processor 10 whose liquid inlet is connected to the concentrated liquid outlet of the primary reverse osmosis membrane processor 9, and a tertiary reverse osmosis membrane processor 11 whose liquid inlet is connected to the concentrated liquid outlet of the secondary reverse osmosis membrane processor 10; the permeates of the primary reverse osmosis membrane processor 9, the secondary reverse osmosis membrane processor 10 and the tertiary reverse osmosis membrane processor 11 are all reused in the circulating water for hydrogen peroxide production. The reverse osmosis membrane area of the first-stage reverse osmosis membrane processor 9 is larger than the reverse osmosis membrane area of the second-stage reverse osmosis membrane processor 10; the reverse osmosis membrane area of the second-stage reverse osmosis membrane processor 10 is larger than the reverse osmosis membrane area of the third-stage reverse osmosis membrane processor 11; the first-stage reverse osmosis membrane processor 9, the second-stage reverse osmosis membrane processor 10 and the third-stage reverse osmosis membrane processor 11 all use RO reverse osmosis membranes. During the production process, the difference between the inlet water pressure into each level of reverse osmosis membrane processor and the outlet concentrated liquid pressure is controlled to be no less than 0.10Mpa. In the embodiment, the reverse osmosis membrane area of the first-stage reverse osmosis membrane processor 9 is larger than the reverse osmosis membrane area of the second-stage reverse osmosis membrane processor 10; the reverse osmosis membrane area of the second-stage reverse osmosis membrane processor 10 is larger than the reverse osmosis membrane area of the third-stage reverse osmosis membrane processor 11; the first-stage reverse osmosis membrane processor 9, the second-stage reverse osmosis membrane processor 10 and the third-stage reverse osmosis membrane processor 11 all use RO reverse osmosis membranes.

[0015] Working principle: The discharge water collection tank 1 collects the sewage at the bottom of the circulating water station, mechanical seal cooling water, steam condensate, rainwater and relatively clean cleaning water, etc. The sewage collected in the discharge water collection tank 1 is pumped into the primary filter 3 by the first water pump 2, and the large particles of impurities are removed by the primary filter 3. The filtrate of the primary filter 3 flows into the buffer tank 4, and the sewage in the buffer tank 4 is pumped into the sand filter 6 by the second water pump 5. The larger suspended particles and sediments are removed by the sand filter 6. The filtrate of the sand filter 6 is pressurized by the third water pump 7 and enters the secondary filter 8. After the suspended particles and sediments are removed by the secondary filter 8, the filtrate enters the primary reverse osmosis membrane processor 9, the concentrated liquid of the primary reverse osmosis membrane processor 9 enters the secondary reverse osmosis membrane processor 10, and the concentrated liquid of the secondary reverse osmosis membrane processor 10 enters the tertiary reverse osmosis membrane processor 11. The RO membranes of the first-stage reverse osmosis membrane processor 9, the second-stage reverse osmosis membrane processor 10, and the third-stage reverse osmosis membrane processor 11 have pore sizes as small as nanometers. Under a certain pressure, water molecules can pass through the RO membranes, while impurities such as organic matter, inorganic salts, heavy metal ions, colloids, bacteria, and viruses in the source water cannot. This allows for a strict separation between the permeable pure water and the impermeable concentrated water, effectively removing heavy aromatic hydrocarbons, trioctyl phosphate, alkyl anthraquinone, and their degradation products from the hydrogen peroxide production circulating water. The pressure difference between the inlet water and the outlet concentrate of each stage of the reverse osmosis membrane processor is controlled between 0.10 and 0.15 MPa, and the outlet concentrate pressure is greater than 0.50 MPa. If necessary, booster pumps can be added to the inlet pipelines of each stage of the reverse osmosis membrane processor to ensure that the reverse osmosis membrane processor operates within the appropriate process range.

[0016] This utility model provides a technical solution that utilizes three reverse osmosis membrane treatment systems in series, achieving a high water reuse rate and effectively removing heavy aromatics, trioctyl phosphate, alkyl anthraquinone, and their degradation products from the circulating water used in hydrogen peroxide production. This reduces water usage during hydrogen peroxide production and promotes the development of water-saving technologies for hydrogen peroxide production.

[0017] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for recycling discharged water from hydrogen peroxide production, comprising a discharged water collection tank (1), a first water pump (2) whose water inlet is connected to the discharged water collection tank (1), a primary filter (3) whose water inlet is connected to the water outlet of the first water pump (2), a buffer tank (4) for receiving filtrate from the primary filter (3), a second water pump (5) whose water inlet is connected to the buffer tank (4), a sand filter (6) whose water inlet is connected to the water outlet of the second water pump (5), a third water pump (7) whose water inlet is connected to the sand filter (6), and a secondary filter (8) whose water inlet is connected to the water outlet of the third water pump (7), characterized in that: The invention also includes a first-stage reverse osmosis membrane processor (9) whose liquid inlet is connected to the liquid outlet of the second-stage filter (8), a second-stage reverse osmosis membrane processor (10) whose liquid inlet is connected to the concentrated liquid outlet of the first-stage reverse osmosis membrane processor (9), and a third-stage reverse osmosis membrane processor (11) whose liquid inlet is connected to the concentrated liquid outlet of the second-stage reverse osmosis membrane processor (10); the permeates of the first-stage reverse osmosis membrane processor (9), the second-stage reverse osmosis membrane processor (10) and the third-stage reverse osmosis membrane processor (11) are all recycled into the circulating water for hydrogen peroxide production.

2. The device for recycling discharged water from hydrogen peroxide production according to claim 1, characterized in that: The reverse osmosis membrane area of the first-stage reverse osmosis membrane processor (9) is greater than the reverse osmosis membrane area of the second-stage reverse osmosis membrane processor (10); the reverse osmosis membrane area of the second-stage reverse osmosis membrane processor (10) is greater than the reverse osmosis membrane area of the third-stage reverse osmosis membrane processor (11); the first-stage reverse osmosis membrane processor (9), the second-stage reverse osmosis membrane processor (10) and the third-stage reverse osmosis membrane processor (11) all use RO reverse osmosis membranes.

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