Hydrogen peroxide solution coalescer

Abstract

The utility model provides a hydrogen peroxide solution coalescer. A partition plate of the coalescer is arranged in a cylinder body; the multiple filter elements are installed on the partition plate in the barrel, each filter element comprises multiple filter layers, and the multiple filter layers sequentially comprise the first filter layer, the second filter layer, the third filter layer and the fourth filter layer which are spirally wound in the axial direction of the multiple filter elements from inside to outside so that materials can flow along filter wires in the spiral direction of the multiple filter layers from inside to outside. Organic matter dispersed phase liquid drops in the materials are coalesced; wherein the first filter layer, the second filter layer, the third filter layer and the fourth filter layer are different filter layers. And the materials present different density gradients at different positions, so that the materials flow in the filter element along the filter wires in a rotating manner. According to the back-and-forth baffling flow channel, the time for materials to pass through the medium layer is prolonged, the possibility of collision coalescence of oil-phase liquid drops and filter element fibers is increased, and working solutions such as free organic matters in hydrogen peroxide can be better coalesced and removed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coalescer, especially relates to a hydrogen peroxide solution coalescer. BACKGROUND

[0002] Hydrogen peroxide solution (commonly known as hydrogen peroxide) as important raw material of caprolactam production, its product quality determines the caprolactam production process and quality, so the total carbon content in hydrogen peroxide has strict requirements.

[0003] In hydrogen peroxide production, finished hydrogen peroxide controls total carbon content, that is, part 2-ethyl anthraquinone, tetrabutyl urea, tri-octyl phosphate, C10 aromatic hydrocarbon and other organic substances (measured by TOC total carbon) are entrained in finished hydrogen peroxide. This part of organic matter is suspended in hydrogen peroxide in the form of microparticles (diameter several microns), which is difficult to settle and separate. Traditional methods select filler separation equipment, purification tower extraction, macroporous resin adsorption and other methods to remove.

[0004] Filler separation method: a horizontal container is arranged, which is filled with inclined plate separation filler or hole plate corrugated filler, and the separation of organic matter and hydrogen peroxide is achieved through collision-coalescence-floatation-settlement. However, in the production process, the natural sedimentation process takes a long time, the organic carbon content in hydrogen peroxide is high, reaches 250-350ppm, cannot meet the requirements of caprolactam production on hydrogen peroxide product quality, and the equipment volume is 4 times of the present application, and the land occupation is large.

[0005] Purification tower extraction method: an extraction tower (commonly known as purification tower) is arranged, regular filler is arranged in the tower, and organic hydrogen peroxide enters from the top of the tower and flows out from the tower bottom. Clean aromatic hydrocarbon enters from the tower bottom, floats upward by overflow due to the density difference with hydrogen peroxide, and the organic matter in hydrogen peroxide is extracted and discharged from the top of the tower. The hydrogen peroxide product quality is not high, and a tower device needs to be arranged, which has large equipment investment. A large amount of fresh aromatic hydrocarbon needs to be filled in the tower, which has large investment.

[0006] Macroporous resin adsorption method: two resin towers are arranged, one is used for regeneration, and the other is used for physical adsorption of organic matter in hydrogen peroxide. The disadvantage is that the resin needs to be regenerated after saturation, otherwise the product quality target cannot be met. Regeneration needs to use pure water to remove hydrogen peroxide in the resin tower, which produces a large amount of low-concentration hydrogen peroxide, causing waste. Then, methanol is used to regenerate the resin, and pure water is used to wash the methanol remaining in the resin to prevent the explosion accident caused by the contact between hydrogen peroxide and methanol when the resin bed is put into use. The regenerated methanol contains water and organic impurities. In order to reuse the methanol, a rectifying tower and system need to be arranged, which needs to consume a large amount of steam and electric energy, and produces methanol wastewater at the same time. In addition, the resin continuously adsorbs accumulated impurities, which is easy to cause misoperation and lead to hydrogen peroxide decomposition explosion accident. UTILITY MODEL CONTENTS

[0007] The embodiment of the utility model discloses a hydrogen peroxide solution coalescer.

[0008] The embodiment of the utility model discloses a hydrogen peroxide solution coalescer, characterized in that comprising:

[0009] The cylinder body;

[0010] The partition plate is arranged in the cylinder body;

[0011] The plurality of filter cartridges are installed on the partition plate in the cylinder body, and each of the plurality of filter cartridges comprises a plurality of filter layers, the plurality of filter layers comprise a first filter layer, a second filter layer, a third filter layer and a fourth filter layer which are spirally wound along the axial direction of the plurality of filter cartridges from inside to outside, so that the material can flow along the spiral direction of the plurality of filter layers from inside to outside, and the organic matter dispersed phase droplets in the material can be coalesced.

[0012] The first filter layer, the second filter layer, the third filter layer and the fourth filter layer are different filter layers.

[0013] In some embodiments, the first filter layer is a polyester filter cloth, the second filter layer is a glass coalescence fiber, the third filter layer is a polytetrafluoroethylene coalescence fiber, and the fourth filter layer is a support net.

[0014] In some embodiments, the filtering precision of the first filter layer is smaller than that of the second filter layer and the third filter layer, and the first filter layer is used for intercepting solid particles in the material entering the plurality of filter cartridges.

[0015] In some embodiments, the filtering precision of the second filter layer is smaller than that of the third filter layer, the second filter layer is used for capturing organic matter dispersed phase droplets in the material filtered by the first filter layer, and the third filter layer is used for capturing organic matter dispersed phase droplets in the material filtered by the second filter layer, so that the organic matter dispersed phase droplets are coalesced, the coalesced organic matter droplets fall off from the hydrogen peroxide fluid, and two-phase separation is realized by the organic matter droplets reaching the dispersed phase collection area of the coalescer through the settling space of the coalescer.

[0016] In some embodiments, the partition plate is provided with mounting holes of the plurality of filter cartridges, the mounting holes of the plurality of filter cartridges are provided with back plates, the back plates are threadedly connected with the flower plates, the back plates are concentric ring structures, the outer ring of the back plate is used for fixedly mounting the flower plate, the inner ring of the back plate is provided with threads for mounting pull rods, and the pull rods are used for pulling and fixing the plurality of filter cartridges.

[0017] In some embodiments, the mounting hole of the flower plate is provided with a groove and a water line, the flower plate is sealed with the plurality of filter cartridges respectively through a tetrafluoro pad, the groove of the flower plate is provided with a boss, and the boss is used for limiting the plurality of filter cartridges respectively.

[0018] In some embodiments, 20-50 filter cartridges are arranged in the barrel, the diameter of the filter cartridges is 50-200 mm, the length of the filter cartridges is 1000-2000 mm, and end covers are further arranged at both ends of the filter cartridges.

[0019] In some embodiments, an adjusting nut, a support plate and a locking nut are arranged on the pull rod, the adjusting nut is used for adjusting the support plate to the same horizontal plane, and the locking nut is used for fixing the pull rod.

[0020] In some embodiments, the settling space of the coalescer is 2-15 m, and the dispersed phase collection area of the coalescer is arranged in a cylindrical straight cylinder segment at the top of the coalescer.

[0021] The embodiment of the utility model has the advantages that:

[0022] The plurality of filter layers are wound in a spiral winding mode, the separation of hydrogen peroxide and working liquid is realized, the material presents different density gradients at different positions, and the material flows in a rotating mode along the filter wire in the filter cartridge. The flow channel of this back-and-forth flow increases the time of the material passing through the medium layer and increases the possibility of collision and coalescence of the oil phase droplets and the filter fiber, so that the free organic matter and other working liquids in the hydrogen peroxide can be better coalesced and removed. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or related technologies, the following will briefly introduce the drawings needed to be used in the embodiment or related technology description. Obviously, the drawings in the following description are only some embodiments in the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0024] Figure 1 It is a structure diagram of the coalescer of the utility model;

[0025] Figure 2 It is a structure diagram of the coalescer of the utility model; Figure 1 It is a local enlarged view of the connection between the filter cartridge and the partition plate;

[0026] Figure 3 It is a local enlarged view of the connection between the filter cartridge and the partition plate; Figure 1 It is a local enlarged view of the connection between the filter cartridge and the partition plate;

[0027] Figure 4 It is a structure diagram of the flower plate of the utility model;

[0028] Figure 5 The utility model discloses a schematic view of filter core of multilayer filter layer.

[0029] Figure 6 The utility model discloses the winding mode of multilayer filter layer and the flow direction of material schematic view.

[0030] Reference Signs: 1, cylinder body;2, partition;3, filter core;4, flower board;5, first filter layer;6, second filter layer;7, third filter layer;8, fourth filter layer;9, straight cylinder section. DETAILED DESCRIPTION

[0031] The various aspects and features of the application are described herein with reference to the accompanying drawings.

[0032] It is to be understood that various alterations and modifications can be made to the embodiments thereof that have been described herein. The foregoing description should not be viewed as limiting the application, but merely as an example of the presently preferred embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.

[0033] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the application and, together with the description given above and the detailed description of the embodiments given below, serve to explain the principles of the application.

[0034] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example only, with reference to the attached drawings.

[0035] It is also to be understood that even though a number of embodiments of the application have been described herein, many adaptations and modifications will be readily apparent to those of ordinary skill in the art.

[0036] The above and other aspects, features, and advantages of the present application will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, when considered in conjunction with the following detailed description.

[0037] Specific embodiments of the application are described hereinbelow, with reference to the drawings; however, it will be understood that the described embodiments are merely examples of the application, which can be embodied in many different forms. Well-known and / or redundant functions and structures have not been described in detail in order to not obscure the application unnecessarily. Accordingly, the detailed description of the specific structures and functions of the described embodiments is not intended to limit the application, but merely to set forth a representative basis for the claims and the representative basis for teaching one skilled in the art to use the application in virtually any appropriate detailed structure.

[0038] The specification can use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which can refer to one or more embodiments according to the application.

[0039] The embodiments of the present application provide a hydrogen peroxide solution coalescer, which can adopt a horizontal coalescer.

[0040] In combination Figure 1 , the coalescer is 4-8 m long, preferably 8-10 m. The diameter is 1.2-3 m, preferably 2.5-3 m. The cylinder body 1 of the coalescer is horizontally arranged. There is a space capable of accommodating a plurality of filter cartridges 3.

[0041] In combination Figure 2 , Figure 3 and Figure 4 , a partition plate 2 is arranged inside the coalescer cylinder body 1, and the partition plate 2 is provided with filter cartridge 3 mounting holes in the form of an equilateral triangle to ensure the strength of the flower plate 4. The mounting hole is provided with a back plate which is screwed on the flower plate 4, and the back plate is a concentric ring structure, the outer ring is used for fixed installation between the flower plate 4, and the inner ring is provided with threads for installing the filter cartridge 3 pull rod. In combination Figure 4 , the flower plate 4 is provided with a groove at the mounting hole, and a water line is provided, which is sealed with a filter cartridge 3 through a four-fluorine pad, and the boss of the flower plate 4 groove can prevent the filter cartridge 3 from being displaced upward or downward due to the action of gravity or the flow impact force of hydrogen peroxide material during operation, so as to cause the filter cartridge 3 to be separated from the flower plate 4 mounting hole, causing short circuit and filter cartridge 3 failure.

[0042] The filter cartridge 3 can be fixed by a pull rod to ensure that the filter cartridge 3 and the partition plate 2 can be tightly connected.

[0043] The number of filter cartridges 3 can be 20-50, preferably 28-36; the core diameter is 50-200 mm, 100-200 mm. The length of the filter cartridge 3 is 1000-2000 mm, 1000-1500 mm.

[0044] The filter cartridge 3 is provided with an end cover at both ends, and one end of the filter cartridge 3 is compressed by a sealing pad, a pressing plate, a gasket, and a nut. The pressing plate is provided with an O-ring for sealing between the pressing plate and the pull rod, and the pressing plate is provided with a boss which is also used to prevent the filter cartridge 3 from being displaced upward or downward. Then, an adjusting nut, a support plate, and a locking nut are arranged after a small distance of the pull rod. Since there may be a slight deviation in the installation length of all filter cartridges 3 in the radial direction of the hydrogen peroxide coalescer, the adjusting nut is arranged to adjust the position of the adjusting nut so that the support plate can be in the same horizontal plane, and the compression nut is used to fix the pull rod.

[0045] In combination Figure 1 , Figure 2 , Figure 5 and Figure 6, a plurality of filter cartridges 3 are installed on the partition plate 2 in the cylinder 1, each of the plurality of filter cartridges 3 comprises a plurality of filter layers, the plurality of filter layers comprises, from inside to outside, a first filter layer 5, a second filter layer 6, a third filter layer 7 and a fourth filter layer 8 which are spirally wound along the axial direction of the plurality of filter cartridges 3, so that the material can flow along the spiral direction of the plurality of filter layers from inside to outside, and the organic matter dispersed phase droplets in the material are coalesced.

[0046] Among them, the first filter layer 5, the second filter layer 6, the third filter layer 7 and the fourth filter layer 8 are different filter layers.

[0047] As one of the embodiments, the first filter layer 5 is a polyester filter cloth, the second filter layer 6 is a glass coalescence fiber, the third filter layer 7 is a polytetrafluoroethylene (PTFE) coalescence fiber, and the fourth filter layer 8 is a stainless steel support net.

[0048] The filter cartridge 3 uses a variety of high-performance filter materials to separate hydrogen peroxide and working fluid by a special winding method. The filter cartridge 3 adopts the form of material entering from inside to outside, and the advanced filter cloth arrangement sequence is to set polyester filter cloth, glass coalescence fiber, PTFE coalescence fiber and stainless steel support net from inside to outside. The filter cloth is arranged in a special winding method. This special pattern (see Figure 5 ) makes the material present different density gradients at different positions, so that the material flows in a rotating manner along the filter wire in the filter cartridge 3. This back-and-forth flow channel increases the time of the material passing through the medium layer and increases the possibility of collision and coalescence of the oil phase droplets and the fibers of the filter cartridge 3, so that the free working fluid in the hydrogen peroxide can be better coalesced and removed.

[0049] The filtration precision of the plurality of filter layers can be different. For example, the filtration precision of the first filter layer 5 is smaller than that of the second filter layer 6 and the third filter layer 7, and the first filter layer 5 is used to intercept solid particles in the material entering the plurality of filter cartridges 3.

[0050] The filtration precision of the second filter layer 6 is smaller than that of the third filter layer 7, and the second filter layer 6 is used to capture organic matter dispersed phase droplets in the material filtered by the first filter layer 5, and the third filter layer 7 is used to capture organic matter dispersed phase droplets in the material filtered by the second filter layer 6, so that the organic matter dispersed phase droplets are coalesced, the coalesced organic matter droplets are separated from the hydrogen peroxide fluid, and the coalesced organic matter droplets reach the dispersed phase collection area of the coalescer through the settling space of the coalescer to realize two-phase separation.

[0051] The coalescing process can be divided into four stages:

[0052] First stage: material pre-filtering, the material enters the filter core 3, and the polyester filter cloth intercepts solid particles to prevent the channels of the glass coalescence fiber and the PTFE coalescence fiber from being blocked, causing coalescence failure.

[0053] Second stage: droplet trapping, the small droplets (with a diameter of several microns) of the organic dispersed phase continuously collide with the glass coalescence fiber in the coalescence filter core 3 during movement and are trapped. Smaller droplets that are not trapped are trapped by the PTFE coalescence fiber. Through the arrangement of the two different fibers, the problem of incomplete small droplet trapping caused by the use of glass fiber alone, resulting in incomplete removal of the product working fluid and substandard quality, is avoided. At the same time, the problem of small hydrogen peroxide material flux and insufficient processing load caused by the use of PTFE coalescence fiber alone is avoided, and a large number of filter cores 3 are required to meet production requirements, which increases the size of the equipment and doubles the investment.

[0054] Third stage: droplet coalescence, the trapped small droplets of the organic matter collide and coalesce with each other under the action of fluid, thereby coalescing and growing larger (coalescing into droplets with a diameter of 0.5-5 mm), moving along the fiber, and finally falling off under the action of gravity or buoyancy.

[0055] Fourth stage: droplet settling, the large droplets of the organic matter fall off from the hydrogen peroxide fluid, pass through the settling space of the equipment, and reach the dispersed phase collection area of the equipment, which is a cylindrical straight section 9 arranged at the top of the equipment, effectively realizing two-phase separation and discharging the collected oil phase. The settling space of the coalescer is 2 m to 15 m, preferably 7-12 m. The dispersed phase collection area of the coalescer is arranged in the cylindrical straight section 9 at the top of the coalescer.

[0056] The new technology has the discharge index of total organic carbon content in hydrogen peroxide <0.015%wt.

[0057] In the above scheme, the operating temperature of the material is 5-50°C, preferably 20-25°C.

[0058] The hydrogen peroxide production device applies the working fluid-35% hydrogen peroxide solution coalescence technology, the total organic carbon content in the hydrogen peroxide product is reduced from 200-350 ppm to below 150 ppm, which greatly improves the quality of the hydrogen peroxide product, the color of the hydrogen peroxide product changes from light yellow to colorless and transparent, and the maintenance cycle of the oxime membrane tube is increased. The maintenance cycle of the caprolactam membrane tube is reduced from 2 times / year to 1 time / year, which increases the yield and income of caprolactam; the annual maintenance cost of the oxime membrane tube is saved, and the economic benefit is very considerable.

[0059] The process analysis index of the hydrogen peroxide tank of the coalescer of the present application is as follows:

[0060]

[0061]

[0062]

[0063]

[0064]

[0065] The total organic carbon content of the hydrogen peroxide solution in the embodiment of the present application is reduced from 250-350ppm to below 150ppm. No power and aromatic hydrocarbon consumption is required. The original technology consumes a large amount of power and aromatic hydrocarbon, wherein the aromatic hydrocarbon pump power is 4kw / h, and new aromatic hydrocarbon needs to be continuously consumed for extracting the hydrogen peroxide solution. Compared with the macroporous resin adsorption method, the hydrogen peroxide coalescer has a significantly lower investment cost, does not require the use of methanol, and does not cause impurities to accumulate in the resin, and has a higher safety level. The resin needs to be replaced regularly, the price of the coalescer filter element is generally 1 / 10 of that of the adsorption resin, and the coalescer filter element has a longer replacement period, generally more than 2 years. The coalescer is a static device, and by utilizing the interface characteristics after the separation of organic matter and hydrogen peroxide, an automatic operation method of the organic matter can be set, so that unmanned operation is realized, and the device is automatically operated. No auxiliary equipment is required, no additional power supply is required, and the investment is small.

[0066] The above describes in detail multiple embodiments of the present application, but the present application is not limited to these specific embodiments. Based on the concept of the present application, those skilled in the art can make various modified embodiments, and these modifications should fall within the scope of the present application.

Claims

1. A hydrogen peroxide solution coalescer characterized by, The application relates to a filter device, which comprises: a cylinder body; a partition plate arranged in the cylinder body; a plurality of filter cartridges mounted on the partition plate in the cylinder body, wherein each of the plurality of filter cartridges comprises a plurality of filter layers, and the plurality of filter layers comprise, from inside to outside, a first filter layer, a second filter layer, a third filter layer and a fourth filter layer spirally wound along the axial direction of the plurality of filter cartridges, so that material can flow along the spiral direction of the plurality of filter layers from inside to outside, and organic droplets in the material can be coalesced; wherein the first filter layer, the second filter layer, the third filter layer and the fourth filter layer are different filter layers.

2. The hydrogen peroxide solution coalescer of claim 1, wherein, The first filter layer is a polyester filter cloth, the second filter layer is a glass coalescing fiber, the third filter layer is a polytetrafluoroethylene coalescing fiber, and the fourth filter layer is a support net.

3. The hydrogen peroxide solution coalescer of claim 1, wherein, The filtering precision of the first filter layer is smaller than that of the second filter layer and the third filter layer, and the first filter layer is used for intercepting solid particles in the material entering the plurality of filter cartridges.

4. The hydrogen peroxide solution coalescer of claim 1, wherein, The filtering precision of the second filter layer is smaller than that of the third filter layer, the second filter layer is used for capturing organic droplets in the material filtered by the first filter layer, and the third filter layer is used for capturing organic droplets in the material filtered by the second filter layer, so that the organic droplets are coalesced, the coalesced organic droplets are separated from the hydrogen peroxide fluid, and the coalesced organic droplets reach the dispersed phase collection area of the coalescer through the settling space of the coalescer to realize two-phase separation.

5. The hydrogen peroxide solution coalescer of claim 1 wherein, The partition plate is provided with mounting holes for the plurality of filter cartridges, the mounting holes of the plurality of filter cartridges are provided with back plates, the back plates are threadedly connected with the flower plates, the back plates are concentric ring structures, the outer rings of the back plates are used for fixedly mounting the flower plates, the inner rings of the back plates are provided with threads for mounting pull rods, and the pull rods are used for pulling and fixing the plurality of filter cartridges.

6. The hydrogen peroxide solution coalescer of claim 5, wherein, The mounting holes of the flower plates are provided with grooves and water lines, the flower plates are respectively sealed with the plurality of filter cartridges through tetrafluoro pads, the grooves of the flower plates are provided with bosses, and the bosses are used for respectively limiting the plurality of filter cartridges.

7. The hydrogen peroxide solution coalescer of claim 5, wherein, The cylinder body is provided with 20 to 50 filter cartridges, the diameter of the filter cartridges is 50 mm to 200 mm, the length of the filter cartridges is 1000 mm-2000 mm, and the filter cartridges are further provided with end covers at two ends.

8. The hydrogen peroxide solution coalescer of claim 5, wherein, Adjusting nuts, supporting plates and locking nuts are arranged on the pull rods, the adjusting nuts are used for adjusting the supporting plates to the same horizontal plane, and the locking nuts are used for fixing the pull rods.

9. The hydrogen peroxide solution coalescer of claim 4, wherein, The settling space of the coalescer is 2 m to 15 m, and the dispersed phase collection area of the coalescer is arranged in a cylindrical straight cylinder segment at the top of the coalescer.

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