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CN-116236813-B - Extraction tower for hydrogen peroxide production

CN116236813BCN 116236813 BCN116236813 BCN 116236813BCN-116236813-B

Abstract

The invention discloses an extraction tower for hydrogen peroxide production, which comprises a tower body, wherein a composite tower plate is arranged in the tower body, the composite tower plate comprises a sieve plate, a flow guide bracket, a composite filler layer, a downcomer and a flow guide filler layer, the flow guide bracket is positioned below the sieve plate and above the composite filler layer, the upper end of the downcomer is flush with the sieve plate, penetrates through the flow guide bracket and the composite filler layer, and the lower end of the downcomer is positioned in a gap area between the composite filler layer and the flow guide filler layer. The extraction tower is simple in structure, is convenient to structurally reform an existing sieve plate extraction tower, is easy to popularize and apply, can effectively solve the problems of worsening of the working condition of the extraction tower, substandard extraction concentration, overhigh extraction residue, decline of working solution flux and the like in hydrogen peroxide production, and has important significance in improving extraction efficiency, reducing liquid holdup of the extraction tower and guaranteeing safe and stable operation of the device.

Inventors

  • XU YINGRUI
  • PANG FEI
  • SHEN JINGJING
  • CHAI CHUNLING
  • MA JUN
  • BAI LIGUANG
  • ZHAO XIAODONG

Assignees

  • 黎明化工研究设计院有限责任公司

Dates

Publication Date
20260512
Application Date
20230203

Claims (17)

  1. 1. The extraction tower for hydrogen peroxide production comprises a tower body (101), and is characterized in that a composite tower plate (201) is arranged in the tower body (101), the composite tower plate (201) comprises a sieve plate (1), a flow guide bracket (2), a composite filler layer (3), a downcomer (9) and a flow guide filler layer (8), the flow guide bracket (2) is positioned below the sieve plate (1) and above the composite filler layer (3), the upper end of the downcomer (9) is flush with the sieve plate (1), penetrates through the flow guide bracket (2) and the composite filler layer (3), and the lower end of the downcomer is positioned in a gap area between the composite filler layer (3) and the flow guide filler layer (8); the flow guide bracket (2) is a framework structure composed of a circular ring and a plurality of hard filaments, one end of each hard filament is connected with the circular ring, and the other end of each hard filament is intersected above the circular ring; The material of the diversion bracket (2) is one or more of stainless steel, polypropylene, polyvinyl chloride, polytetrafluoroethylene, polyvinylidene fluoride and glass fiber; and each filler of the composite filler layer (3) is made of one or more of polypropylene, polyvinyl chloride, polytetrafluoroethylene, polyvinylidene fluoride and glass fiber, and is used in combination with stainless steel.
  2. 2. The extraction tower according to claim 1, wherein the height of the diversion bracket (2) is 5-100 mm, and the distance between the top end of the diversion bracket (2) and the upper sieve plate (1) is 0-10 mm.
  3. 3. The extraction tower according to claim 2, wherein the height of the diversion bracket (2) is 10-80 mm, and the distance between the top end of the diversion bracket (2) and the upper sieve plate (1) is 0-5 mm.
  4. 4. The extraction tower according to claim 1, wherein the filler of the composite filler layer (3) is one or more of a silk screen corrugated filler, a gas-liquid filtering silk screen, a silk screen foam remover and an orifice plate corrugated filler, and each filler is made of a combination of two or more of polypropylene, polytetrafluoroethylene and glass fiber and stainless steel.
  5. 5. The extraction tower according to claim 4, wherein the packing of the composite packing layer (3) is a combination of two or more of a wire mesh corrugated packing, a gas-liquid filtering wire mesh and a wire mesh demister.
  6. 6. The extraction tower according to claim 4, wherein the composite trays (201) are numbered sequentially from the bottom upwards, and in the nth composite tray, the ratio of the stainless steel material volume V 1 in the composite packing layer (3) to the rest material combined volume V 2 is r, wherein when n=1 to 10, r=0.1 to 1, when n=11 to 20, r=0.3 to 1.5, when n=21 to 30, r=0.8 to 6, when n=31 to 40, r=0.9 to 10, when n=41 to 50, r=1 to 15, and when n >50, r=1 to 20.
  7. 7. The extraction column of claim 6, wherein when n=1 to 10, r=0.2 to 0.7, when n=11 to 20, r=0.5 to 1.5, when n=21 to 30, r=1 to 4.5, when n=31 to 40, r=1.1 to 8, when n=41 to 50, r=1.2 to 13, and when n >50, r=1 to 15.
  8. 8. The extraction tower according to claim 1, wherein the porosity of the filler selected for the composite filler layer (3) is more than or equal to 90%, and the thickness of the composite filler layer (3) is 1-200 mm.
  9. 9. The extraction tower according to claim 8, wherein the porosity of the filler selected for the composite filler layer (3) is more than or equal to 93%, and the thickness of the composite filler layer (3) is 5-100 mm.
  10. 10. The extraction tower according to claim 1, wherein the distance between the top of the composite packing layer (3) and the bottom of the diversion bracket (2) is 0-200 mm.
  11. 11. The extraction tower according to claim 10, wherein the distance between the top of the composite packing layer (3) and the bottom of the diversion bracket (2) is 0-100 mm.
  12. 12. Extraction column according to claim 1, characterized in that the downcomers (9) have a height of 100-350 mm, the downcomers (9) being alternately distributed "mid-edge" between adjacent sieve plates.
  13. 13. Extraction column according to claim 12, characterized in that the downcomer (9) has a height of 150-300 mm.
  14. 14. The extraction column according to claim 1, wherein the diversion packing layer is a silk screen corrugated packing and/or an orifice plate corrugated packing, wherein each packing is made of one or more of stainless steel, polypropylene, polyvinyl chloride, polytetrafluoroethylene, polyvinylidene fluoride and glass fiber.
  15. 15. The extraction column of claim 14, wherein each filler of the deflector packing layer is a combination of two or more of stainless steel, polypropylene, polytetrafluoroethylene, and fiberglass.
  16. 16. The extraction tower according to claim 1, wherein the porosity of the filler selected for the diversion filler layer is more than or equal to 93%, and the thickness of the diversion filler layer is 0-120 mm.
  17. 17. The extraction tower according to claim 16, wherein the porosity of the filler selected for the diversion filler layer is more than or equal to 95%, and the thickness of the diversion filler layer is 0-60 mm.

Description

Extraction tower for hydrogen peroxide production Technical Field The invention relates to equipment of a hydrogen peroxide production process, in particular to an extraction tower for hydrogen peroxide production. Background The main process for producing hydrogen peroxide by anthraquinone method can be divided into four stages of hydrogenation, oxidation, extraction and post-treatment, wherein the extraction process involves the process of transferring hydrogen peroxide from an organic phase to an aqueous phase. In this process, the design of the extraction column is of importance, and its structure plays a critical role in the yield, quality of hydrogen peroxide, and even in the safe operation of the whole plant. Currently, a sieve plate extraction column is used in the hydrogen peroxide production extraction stage. The sieve plate extraction tower has the advantages of low cost, large treatment capacity, high transfer efficiency and the like, and is widely applied to the chemical production process. In recent years, along with the development of hydrogen peroxide production technology, in order to improve the hydrogen efficiency and the production efficiency of a device and effectively reduce the material consumption, the energy consumption and the production cost, a high-performance working solution system containing a TBU component is widely popularized, but the property of the working solution containing the TBU component is easy to change in a series of ways when the working solution is operated in a system, the working solution is easy to emulsify in an extraction tower and is difficult to gather after being dispersed on an industrial device, and a series of problems such as reduction of the flux of the extraction tower, incapability of forming an effective liquid accumulation layer below a sieve plate and the like are easily caused in the working condition of the current sieve plate extraction tower, and even the flooding of the extraction tower is caused, so that the safe operation of the device is influenced. The traditional sieve plate extraction tower has a simple structure, cannot effectively inhibit phenomena such as interlayer back mixing and the like, has lower extraction efficiency, generally needs more tower plates to meet the requirements of extraction and raffinate concentration, causes larger volume and liquid holdup of the extraction tower, and increases the initial investment of projects. Disclosure of Invention Aiming at the defects of the extraction tower structure in the existing hydrogen peroxide production process, the invention provides an extraction tower with novel composite tower plates, which can optimize the working condition of the easily emulsified working liquid lacing water in the extraction process of hydrogen peroxide production, effectively reduce the hydrogen peroxide content in raffinate and simultaneously improve the hydrogen peroxide effluent concentration at the bottom of the extraction tower. The extraction tower with the novel composite tower plates has a simple structure, is convenient to structurally reform the existing sieve plate extraction tower, is easy to popularize and apply, can effectively solve the problems of deterioration of the working condition of the extraction tower, substandard extraction concentration, overhigh extraction residue, decline of working solution flux and the like in hydrogen peroxide production, and has important significance in improving extraction efficiency, reducing the height of the extraction tower and the liquid holdup of the extraction tower and ensuring safe and stable operation of the device. In order to solve the technical problems, the invention provides an extraction tower for hydrogen peroxide production, which comprises a tower body 101 and is characterized in that a composite column plate 201 is arranged in the tower body 101, the composite column plate 201 comprises a sieve plate 1, a flow guide support 2, a composite packing layer 3, a downcomer 9 and a flow guide packing layer 8, the flow guide support 2 is positioned below the sieve plate 1 and above the composite packing layer 3, the upper end of the downcomer 9 is flush with the sieve plate 1, penetrates through the flow guide support 2 and the composite packing layer 3, and the lower end of the downcomer is positioned in a gap area between the composite packing layer 3 and the flow guide packing layer 8. Further, the screen plate 1 is fixed on a screen plate supporting beam, and the distance between two adjacent layers of screen plates is 300-850 mm, preferably 400-800 mm. Further, the number of the composite trays is 35 to 60, preferably 45 to 55. Further, the flow guiding bracket 2 is a framework structure composed of a circular ring and a plurality of hard filaments, one end of each hard filament is connected with the circular ring, and the other end of each hard filament is intersected above the circular ring. The number of guide brackets 2 per layer