A new type of clay bed

Abstract

The application discloses a novel white clay bed, which comprises a bed body (6), a liquid inlet (1) arranged at the lower part of the bed body (6), a liquid outlet (7) arranged at the upper part of the bed body (6), a liquid distributor (2) arranged above the liquid inlet (1), a coalescence water removal filler (3), a baffle (4) and a honeycomb-shaped integrated regenerant (5) arranged above the liquid distributor (2) in sequence. The novel white clay bed can eliminate the secondary powder formed by the mutual friction of active alumina particles in the white clay bed, greatly reduce the water entrained by the working liquid into the white clay bed, prolong the service life of the regenerant and be favorable to the stable operation of a hydrogen peroxide device.

Description

TECHNICAL FIELD

[0001] The present application relates to a new type of clay bed, in particular to a new type of clay bed used in the field of anthraquinone hydrogen peroxide production. BACKGROUND

[0002] Hydrogen peroxide is a green oxidant and has a wide range of applications in the chemical industry. Currently, hydrogen peroxide is generally produced by the anthraquinone method in industry. In the anthraquinone method process, the carrier and solvent are combined in a certain proportion to form a working solution, which is generally composed of 2-ethyl anthraquinone, 2-butyl anthraquinone, 2-pentyl anthraquinone or their mixture as the carrier, and a mixture of heavy aromatic hydrocarbons, tricaprylyl phosphate, acetate o-methylcyclohexyl and tetrabutyl urea as the solvent. The working solution is circulated in the system in the order of hydrogenation, oxidation, extraction and post-treatment, and produces hydrogen peroxide. In the hydrogenation process, the working solution undergoes hydrogenation reaction under the action of the catalyst to obtain hydrogenated liquid; in the oxidation process, the hydrogenated liquid reacts with oxygen to obtain oxidized liquid; in the extraction process, the hydrogen peroxide in the oxidized liquid is extracted by water to obtain crude hydrogen peroxide, and the working solution flowing out of the extraction process is called raffinate; in the post-treatment process, the raffinate is dehydrated, the hydrogen peroxide is removed, and the degradation products are regenerated, and then enters the circulating working liquid tank to complete a cycle.

[0003] In the circulation process of the working solution, effective anthraquinone also undergoes degradation reaction to generate degradation products that cannot produce hydrogen peroxide. In industrial production, the working solution or hydrogenated liquid is passed through a clay bed filled with activated alumina particles to regenerate part of the degradation products into effective anthraquinone. The clay bed can be provided in the hydrogenation process, which is called hydrogenation clay bed, and is mainly used to regenerate the degradation products generated in the oxidation process; the clay bed provided in the post-treatment process is called post-treatment clay bed, and is mainly used to regenerate the degradation products generated in the hydrogenation process.

[0004] The main component of active alumina is γ-alumina, and a certain amount of alkali metal and alkaline earth metal compounds are added for modification. The shape of the active alumina is spherical particles, with a diameter of about 3-5 mm, and it is generally prepared by the rolling ball method. At present, many researchers have studied how to improve the reactivity and service life of active alumina. In addition to the problems of activity and service life, the main problem faced by active alumina in industrial application is the easy generation of dust. Dust has a greater impact on the production of hydrogen peroxide. Alumina dust entering the hydrogenation process can block the pores of the palladium / alumina catalyst, affecting the activity of the catalyst. In the production of hydrogen peroxide, inorganic acids and bases such as phosphoric acid and potassium carbonate need to be added. These inorganic acids and bases and alumina powder will gradually "bond" the catalyst particles together in the hydrogenation tower, which is one of the reasons for catalyst caking. In the extraction process of hydrogen peroxide production, the mass transfer between the oxidizing liquid and pure water, and a small amount of dust entering the extraction process will cause a significant change in the interfacial tension between the oil and water phases in the extraction tower, leading to the non-aggregation of working liquid droplets and even emulsification, ultimately causing the working liquid to carry water, and the extraction tower to accumulate material. In severe cases, it can cause the device to run at a reduced load, or even shut down.

[0005] There are two main reasons for the generation of dust by active alumina. ① The active alumina prepared by the rolling ball method itself contains a lot of dust. At the same time, in the process of transportation and loading, the friction of active alumina is inevitable, which leads to a lot of dust entering the white clay bed; ② The wear resistance of active alumina balls is poor, and when the working liquid flow is large or fluctuates, the alumina balls rub against each other, generating dust again.

[0006] The main methods to remove the first kind of dust are: when loading active alumina, a centrifugal fan is used to pump air combined with a bag dust collector to partially remove the dust; a bypass filter is set up, and before the white clay bed is put into use, the white clay bed is filled with working liquid, and a circulating pump is used to transport the working liquid, which is continuously circulated between the white clay bed and the bypass filter for a period of time, which can further remove the dust. Since the bed layer of the white clay bed is formed by the accumulation of active alumina particles, the flow channel in the bed layer is complex, and there are short circuits, dead angles, etc. After using the above two methods, there will still be some first kind of alumina dust remaining.

[0007] The remaining first kind of dust and the second kind of dust continuously generated during continuous operation are difficult to remove from the system, and a filter needs to be set up after the white clay bed to intercept the dust. This scheme has the following problems: the dust is fine, even if a high-precision filter is used, it cannot be completely intercepted; the filter core is easily blocked, and the filter core needs to be replaced frequently, causing an increase in production costs.

[0008] In addition to regenerating the degradation product, the absorption of excess water in the working solution is also one of the functions of the clay bed. The active alumina has limited ability to absorb water, and its water absorption function will gradually be lost within a few days after being put into use. After absorbing a large amount of water, the alkaline substances in the active alumina will be gradually carried out, resulting in poor regeneration effect of the active alumina. At the same time, too much water will also promote the pulverization of the active alumina, generating more alumina dust.

[0009] Because the active alumina has a porous structure, it will adsorb a large amount of working solution by itself. When the active alumina loses its regeneration activity, before being replaced, even if nitrogen or water vapor is used for purging, the discarded active alumina will still adsorb a large amount of working solution components, increasing the consumption of the working solution. SUMMARY

[0010] In order to solve the above problems of alumina powder and water removal of the working solution, the present application provides a new type of clay bed, which can completely eliminate the secondary powder formed by the mutual friction of active alumina particles in the clay bed, greatly reduce the water entrained by the working solution into the clay bed, prolong the service life of the regenerant, and facilitate the stable operation of the hydrogen peroxide device.

[0011] To achieve the above purpose, the present application adopts the following technical solutions:

[0012] A new type of clay bed, comprising a bed body 6, a liquid inlet 1 arranged at the lower part of the bed body 6, and a liquid outlet 7 arranged at the upper part of the bed body 6, characterized in that a liquid distributor 2 is arranged above the liquid inlet 1, a coalescence water removal filler 3, a baffle plate 4 and a honeycomb-shaped integral regenerant 5 are sequentially arranged above the liquid distributor 2.

[0013] Further, the bed body 6 is provided with a liquid accumulation bag 13, which is located below the liquid distributor 2, and the bottom of the liquid accumulation bag 13 is provided with a blowdown port 12. The diameter of the liquid accumulation bag 13 is smaller than the diameter of the bed body 6, and the diameter of the liquid accumulation bag 13 is preferably 1 / 6-1 / 2 of the diameter of the bed body 6.

[0014] Further, the liquid distributor 2 has upward liquid discharge holes and downward liquid discharge holes.

[0015] Further, the material of the coalescence water removal filler 3 is a mixture of one or more of polypropylene, polytetrafluoroethylene and stainless steel, and the structure of the coalescence water removal filler 3 is preferably a wire mesh type or a corrugated hole plate type.

[0016] Further, the structure of the baffle plate 4 is preferably a streamline type, a zigzag type, a trapezoidal type, etc.

[0017] Further, the shape of the channels of the honeycomb-shaped integral regenerant 5 can be circular, square, triangular, etc., and the hole size is preferably 0.5-5 mm.

[0018] Further, the honeycomb monolithic regenerant 5 is mixed incorporation type or coating type. The mixed incorporation type honeycomb monolithic regenerant is composed of one or more of the oxides of aluminum and the oxides of magnesium, calcium, sodium, potassium and cerium; the skeleton of the coating type honeycomb monolithic regenerant is one of cordierite, mullite, stainless steel and ceramic, and the coating of the coating type honeycomb monolithic regenerant is composed of one or more of the oxides of aluminum and the oxides of magnesium, calcium, sodium, potassium and cerium.

[0019] Further, the bypass filter 10 and the circulating pump 11 are provided, one end of the circulating pump 11 is connected to the lower part of the bed body 6, the other end is connected to the bypass filter 10, and the bypass filter 10 is connected to the upper part of the bed body 6. Before the honeycomb monolithic regenerant 5 is initially put into use, the circulating pump 11 is used to circulate the working liquid between the clay bed and the bypass filter 10, and the circulation is stopped when the pressure difference of the bypass filter 10 is stable.

[0020] Further, the nitrogen inlet 8 and the water vapor inlet 9 are provided at the top of the new clay bed, which are used to purge the working liquid adsorbed by the clay bed.

[0021] Further, the new clay bed is used in the production device for hydrogen peroxide prepared by the anthraquinone method, which can be a hydrogenation clay bed or a post-treatment clay bed.

[0022] The new clay bed has the following advantages:

[0023] (1) The honeycomb monolithic regenerant bed layer is a regular stacking of block catalysts, the overall diameter of the block catalysts is close to the inner diameter of the clay bed, and there is no mutual abrasion, which eliminates the generation of secondary dust. When the honeycomb monolithic regenerant is packed, since the honeycomb monolithic regenerant itself has less powder, a centrifugal fan is not needed to extract and a bag dust collector is not needed to collect the powder. The fluid passage of the honeycomb monolithic regenerant is simple, the whole bed layer has small resistance, there is no fluid short circuit and dead angle, and the bypass filter can completely remove the small amount of dust of the honeycomb monolithic regenerant itself. No filter is needed after the clay bed, which reduces the investment cost and production cost.

[0024] (2) When the coating type honeycomb monolithic regenerant is used, the skeleton is inert material, the pore structure of the skeleton is less, and the content of the adsorbed working liquid is much lower than that of the granular activated alumina, which reduces the loss of the working liquid caused by the replacement of the regenerant.

[0025] (3) The coalescence water removal filler can coalesce the fine water droplets entrained by the working liquid into larger water droplets, and the baffle can intercept the water droplets, ensuring that most of the water is settled to the liquid accumulation bag at the bottom of the clay bed, thereby prolonging the service life of the clay bed. In addition to the function of intercepting water droplets, the baffle also supports the entire honeycomb-shaped monolithic regenerant bed. This structure is simple, does not require manual installation of wire mesh, ring expansion, etc., and completely avoids the outflow of alumina particles caused by the rupture of the wire mesh.

[0026] (4) The liquid accumulation bag is arranged below the liquid distributor, and the diameter of the liquid accumulation bag is smaller than the diameter of the clay bed. The working liquid feed does not disturb the liquid in the liquid accumulation bag, which is conducive to the settlement and separation of water in the working liquid.

[0027] (5) The liquid distributor has upward discharge holes to ensure that the working liquid is evenly distributed after entering the clay bed and evenly passes through the honeycomb-shaped monolithic regenerant. The liquid distributor has downward liquid discharge holes, and the working liquid in the liquid distributor can be smoothly discharged when the vehicle is parked. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the new clay bed structure;

[0029] Figure 2 is a top view of the honeycomb-shaped monolithic regenerant with circular channels;

[0030] Figure 3 is a top view of the honeycomb-shaped monolithic regenerant with square channels;

[0031] Figure 4 is a top view of the honeycomb-shaped monolithic regenerant with triangular channels;

[0032] Wherein, 1 is a liquid inlet, 2 is a liquid distributor, 3 is a coalescence water removal filler, 4 is a baffle, 5 is a honeycomb-shaped monolithic regenerant, 6 is a bed body, 7 is a liquid outlet, 8 is a nitrogen inlet, 9 is a water vapor inlet, 10 is a bypass filter, 11 is a circulating pump, 12 is a sewage outlet, 13 is a liquid accumulation bag, 14 is a vent. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present application will be clearly and completely described below in combination with the drawings and specific implementation schemes. It should be noted that the following described examples are only a part of the examples of the present application, not all examples, and are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the examples of the present application, all other examples obtained by those skilled in the art without creative improvement are within the scope of protection of the present application. If the specific conditions are not specified in the examples, the conventional conditions or the conditions recommended by the manufacturer are used.

[0034] Example 1

[0035] A hydrogen peroxide production device, a single new post-treatment clay bed filled with 50 tons of coating type honeycomb monolithic regenerant.

[0036] As shown in Figure 1 , the clay bed contains coalescing water removal filler and honeycomb monolithic regenerant, the working fluid enters the clay bed from the bottom, flows upward through the liquid distributor, passes through the coalescing water removal filler, the baffle and the honeycomb monolithic regenerant in turn, and flows out from the upper part of the clay bed.

[0037] The clay bed is provided with a bypass filter and a circulating pump, the coalescing water removal filler is made of polypropylene, and the structure is a wire mesh type, the liquid distributor has upward liquid discharge holes and downward liquid discharge holes. The structure of the baffle is streamline.

[0038] The bottom of the clay bed is provided with a liquid accumulation bag, the liquid accumulation bag is located below the liquid distributor, the diameter of the liquid accumulation bag is 1 / 2 of the diameter of the clay bed, and the bottom of the liquid accumulation bag is provided with a sewage outlet.

[0039] The honeycomb monolithic regenerant is of coating type, the skeleton of the coating type honeycomb monolithic regenerant is cordierite, and the coating is composed of a mixture of oxides of aluminum, magnesium, calcium and sodium. The pore shape of the honeycomb monolithic regenerant is circular, and the pore size is 3 mm. Before the initial use of the honeycomb monolithic regenerant, the circulating pump is used to circulate the working fluid between the clay bed and the bypass filter, and the circulation is stopped when the pressure difference of the bypass filter is stable.

[0040] When filling the honeycomb monolithic regenerant, since the honeycomb monolithic regenerant itself has less powder, it is not necessary to use a centrifugal fan to extract and a bag dust collector to collect the powder. Before use, the new post-treatment clay bed is filled with working fluid, and the circulating pump is used to circulate the working fluid between the new post-treatment clay bed and the bypass filter until the pressure difference of the bypass filter is stable. No working fluid filter is arranged after the new post-treatment clay bed. The extraction tower runs well, and there is no accumulation of materials and water caused by aluminum oxide powder, and the load operation is not affected.

[0041] Since the working fluid contains water, the free water can be discharged at the liquid accumulation bag at the bottom of the new clay bed at a rate of 0.2 m 3 / h, and the honeycomb monolithic regenerant of each new post-treatment clay bed is replaced every 90 days of operation according to the need, and after nitrogen pressure charging and water vapor purging, the honeycomb monolithic regenerant of each new post-treatment clay bed can adsorb about 0.5 tons of working fluid.

[0042] Example 2

[0043] A hydrogen peroxide production device, a single new post-treatment clay bed filled with 50 tons of coating type honeycomb monolithic regenerant.

[0044] As shown in Figure 1 The working liquid flows upward through the liquid distributor after entering the white clay bed from the bottom, and sequentially passes through the coalescence water removal filler, the baffle and the honeycomb monolithic regenerant, and the working liquid flows out from the upper part of the white clay bed.

[0045] The white clay bed is provided with a bypass filter and a circulating pump, the coalescence water removal filler is made of polytetrafluoroethylene, and the structure is a corrugated hole plate type. The liquid distributor has upward liquid discharge holes and downward liquid discharge holes, and the baffle structure is rectangular. The white clay bed is provided with a liquid accumulation bag at the bottom, the liquid accumulation bag is located below the liquid distributor, the diameter of the liquid accumulation bag is 1 / 3 of the diameter of the white clay bed, and the bottom of the liquid accumulation bag is provided with a sewage outlet.

[0046] The honeycomb monolithic regenerant is mixed and incorporated, and is composed of a mixture of oxides of aluminum, magnesium and calcium. The channel shape of the honeycomb monolithic regenerant is square, and the hole size is 2 mm. Before the initial use of the honeycomb monolithic regenerant, the working liquid is circulated between the white clay bed and the bypass filter using the circulating pump, and the circulation is stopped when the pressure difference of the bypass filter is stable.

[0047] When the honeycomb monolithic regenerant is loaded, since the honeycomb monolithic regenerant itself has less powder, a centrifugal fan is not needed to extract and a bag dust collector is not needed to collect the powder. Before use, the post-treatment white clay bed is filled with working liquid, and the working liquid is circulated between the post-treatment white clay bed and the bypass filter using the circulating pump until the pressure difference of the bypass filter is stable. The new post-treatment white clay bed is not provided with a working liquid filter. The extraction tower runs well, and there is no accumulation of materials and water due to aluminum oxide powder, and the load reduction operation.

[0048] Since the working liquid contains water, the free water can be discharged at the liquid accumulation bag at the bottom of the new white clay bed at a rate of 0.3 m 3 / h. Each new post-treatment white clay bed can run for more than 100 days after the honeycomb monolithic regenerant is replaced. After nitrogen pressure charging and water vapor purging, the honeycomb monolithic regenerant of each new post-treatment white clay bed can adsorb about 5 tons of working liquid.

[0049] Example 3

[0050] A hydrogen peroxide production device, a single new hydrogenation liquid white clay bed loaded with 40 tons of coated honeycomb monolithic regenerant.

[0051] As shown in Figure 1 The white clay bed contains coalescence water removal filler and honeycomb monolithic regenerant, the working liquid flows upward through the liquid distributor after entering the white clay bed from the bottom, and sequentially passes through the coalescence water removal filler, the baffle and the honeycomb monolithic regenerant, and the working liquid flows out from the upper part of the white clay bed.

[0052] The clay bed is provided with a bypass filter and a circulating pump, the coalescence water removal filler material is a mixture of polypropylene and stainless steel, and the structure is a wire mesh type. The liquid distributor has upward liquid discharge holes and downward liquid discharge holes, and the baffle is a zigzag type. The clay bed is provided with a liquid accumulation bag at the bottom, the liquid accumulation bag is located below the liquid distributor, the diameter of the liquid accumulation bag is 1 / 4 of the diameter of the clay bed, and the bottom of the liquid accumulation bag is provided with a sewage outlet.

[0053] The honeycomb monolithic regenerator is a coating type, the skeleton of the coating type honeycomb monolithic regenerator is stainless steel, and the coating is composed of a mixture of aluminum, sodium and cerium oxides. The channel shape of the honeycomb monolithic regenerator is triangular, and the hole size is 4 mm. Before the honeycomb monolithic regenerator is initially put into use, the circulating pump is used to circulate the working liquid between the clay bed and the bypass filter, and the circulation is stopped when the pressure difference of the bypass filter is stable.

[0054] When the honeycomb monolithic regenerator is loaded, since the honeycomb monolithic regenerator itself has less powder, a centrifugal fan is not needed to extract and a bag dust collector is not needed to collect the powder. Before use, the hydrogenation liquid clay bed is filled with hydrogenation liquid, and the circulating pump is used to circulate the hydrogenation liquid between the hydrogenation liquid clay bed and the bypass filter until the pressure difference of the bypass filter is stable. No hydrogenation liquid filter is arranged after the new hydrogenation liquid clay bed. The extraction tower runs well, and there is no accumulation of materials, water and reduction of load due to alumina powder.

[0055] Since the hydrogenation liquid contains water, the free water can be discharged at the liquid accumulation bag at the bottom of the new clay bed at a rate of 0.1 m 3 / h, and the honeycomb monolithic regenerator is replaced as needed after each new hydrogenation liquid clay bed is operated for 90 days. Before the coating type honeycomb monolithic regenerator is replaced, nitrogen is used for pressure charging, and water vapor is used for purging, and the residual working liquid of the honeycomb monolithic regenerator of each new post-treatment clay bed is about 0.2 tons.

[0056] Example 4

[0057] A hydrogen peroxide production device, a single new hydrogenation liquid clay bed is loaded with 40 tons of mixed and mixed type honeycomb monolithic regenerators.

[0058] As shown in Figure 1 , the clay bed contains coalescence water removal fillers and honeycomb monolithic regenerators, the working liquid enters the clay bed from the bottom, flows upward through the liquid distributor, and successively passes through the coalescence water removal fillers, the baffle and the honeycomb monolithic regenerators, and the working liquid flows out from the upper part of the clay bed.

[0059] The white clay bed is provided with a bypass filter and a circulating pump, the coalescence water removal filler material is a mixture of polypropylene and polytetrafluoroethylene, the structure is a wire mesh type, the liquid distributor has upward liquid discharge holes and downward liquid discharge holes, and the baffle structure is a streamline type. The white clay bed is provided with a liquid accumulation bag at the bottom, the liquid accumulation bag is located below the liquid distributor, the diameter of the liquid accumulation bag is 1 / 6 of the diameter of the white clay bed, and the bottom of the liquid accumulation bag is provided with a blowdown port.

[0060] The honeycomb monolithic regenerator is a coating type. The skeleton of the coating type honeycomb monolithic regenerator is ceramic, and the coating is composed of a mixture of aluminum, magnesium and calcium oxides. The channel shape of the honeycomb monolithic regenerator is square, and the hole size is 5 mm. Before the honeycomb monolithic regenerator is initially put into use, the circulating pump is used to circulate the working liquid between the white clay bed and the bypass filter, and the circulation is stopped when the pressure difference of the bypass filter is stable.

[0061] When the honeycomb monolithic regenerator is loaded, since the honeycomb monolithic regenerator itself has less powder, a centrifugal fan is not needed to extract and a bag dust collector is not needed to collect the powder. Before use, the hydrogenation liquid white clay bed is filled with hydrogenation liquid, and the circulating pump is used to circulate the hydrogenation liquid between the hydrogenation liquid white clay bed and the bypass filter until the pressure difference of the bypass filter is stable. No hydrogenation liquid filter is arranged behind the new hydrogenation liquid white clay bed. The extraction tower runs well, and there is no accumulation of materials, water carrying and load reduction due to alumina powder.

[0062] Since the hydrogenation liquid contains water, the free water can be discharged at the liquid accumulation bag at the bottom of the new white clay bed at a rate of 0.1 m 3 / h, and the honeycomb monolithic regenerator of each new hydrogenation liquid white clay bed can run for 120 days. After nitrogen pressure charging and water vapor purging, the honeycomb monolithic regenerator of each new post-treatment white clay bed can adsorb about 4 tons of working liquid.

[0063] Comparative Example 1

[0064] The post-treatment white clay bed is provided with a bypass filter and a circulating pump, and is not provided with a coalescence water removal filler, a baffle and a liquid accumulation bag, and other conditions are the same as those in Example 1.

[0065] Before use, the new post-treatment white clay bed is filled with working liquid, and the circulating pump is used to circulate the working liquid between the new post-treatment white clay bed and the bypass filter until the pressure difference of the bypass filter is stable. No working liquid filter is arranged behind the new post-treatment white clay bed. The extraction tower runs well, and there is no accumulation of materials, water carrying and load reduction due to alumina powder.

[0066] Since the working liquid contains water, the active alumina is deactivated quickly, and each post-treatment white clay bed needs to be replaced with active alumina after running for 30-40 days. After nitrogen pressure charging and water vapor purging before replacing the active alumina, the active alumina of each post-treatment white clay bed can adsorb about 6 tons of working liquid.

[0067] Comparative Example 2

[0068] In a certain hydrogen peroxide production unit, a single post-treatment clay bed is filled with 60 tons of activated alumina particles. The regenerant consists of particles composed of a mixture of oxides of aluminum, magnesium, calcium, and sodium. A working fluid filter is installed after the post-treatment clay bed, and other conditions are the same as in Example 1.

[0069] During loading, a centrifugal fan is used to extract the powder from the activated alumina particles themselves, and a bag filter is used to collect the powder. Before commissioning, the post-treatment clay bed is filled with working fluid, and a circulating pump is used to circulate the working fluid between the post-treatment clay bed and the bypass filter until the pressure differential of the bypass filter stabilizes. After each post-treatment clay bed is put into operation, the pressure differential of the working fluid filter after the working fluid clay bed increases rapidly. After about 20 days, the pressure differential increases to 100 kPa, requiring replacement of the filter element. Because the working fluid filter cannot completely intercept the powder, there have been multiple instances where alumina powder is carried into the extraction tower, leading to material accumulation and water carryover in the extraction tower, resulting in reduced load operation.

[0070] The bleached clay bed is equipped with a liquid distributor and a liquid collection tank. Because the working fluid contains water, free water up to 0.2m can be drained from the liquid collection tank at the bottom of the new bleached clay bed. 3 Each new type of post-treatment white clay bed operates for approximately 50-60 days. The granular regenerant is then replaced as needed. After nitrogen pressing and steam purging, each new type of post-treatment white clay bed produces approximately 7 tons of granular regenerant adsorption working fluid.

[0071] Comparative Example 3

[0072] In a certain hydrogen peroxide production unit, a single hydrogenated liquid bleaching bed is filled with 40 tons of activated alumina particles. A hydrogenated liquid filter is installed after the bleaching bed. No coalescing dewatering packing, baffles, or liquid collection bags are installed. The regenerant consists of particles composed of a mixture of aluminum, sodium, and cerium oxides. Other conditions are the same as in Example 3.

[0073] During loading, a centrifugal fan is used to extract the powder from the activated alumina particles themselves, and a bag filter is used to collect the powder. Before commissioning, the hydrogenated liquid-clay bed is filled with hydrogenated liquid, and a hydrogenated liquid circulation pump is used to circulate the hydrogenated liquid between the downstream hydrogenated liquid-clay bed and the bypass filter until the pressure differential of the bypass filter stabilizes. After the hydrogenated liquid-clay bed is put into operation, the pressure differential of the downstream hydrogenated liquid filter increases rapidly. After about 20 days, the pressure differential increases to 100 kPa, requiring replacement of the filter element. Because the hydrogenated liquid filter cannot completely intercept the powder, there have been multiple instances where alumina powder was carried into the extraction tower, causing material accumulation and water carryover in the extraction tower, resulting in reduced load operation of the unit.

[0074] Because the hydrogenation liquid contains moisture, the hydrogenation liquid clay bed is deactivated quickly. Every hydrogenation liquid clay bed needs to be replaced with active alumina after running for 40-50 days. Before the replacement of active alumina, the active alumina in every hydrogenation liquid clay bed adsorbs about 4.5 tons of working liquid after being charged by nitrogen and purged by water vapor.

Claims

1. A new type of clay bed for regenerating degradation products of hydrogen peroxide process made by anthraquinone method, comprising a bed body (6), the lower part of the bed body (6) is provided with a liquid inlet (1), and the upper part is provided with a liquid outlet (7), characterized in that, Liquid inlet (1) is provided with liquid distributor (2) above, liquid distributor (2) is provided with coalescence water removal packing (3), baffle (4), honeycomb monolithic regenerant (5) in turn above; The honeycomb monolithic regenerant is mixed incorporation type or coating type; The mixed incorporation type honeycomb monolithic regenerant is composed of one or more of the oxides of aluminum and the oxides of magnesium, calcium, sodium, potassium and cerium; The skeleton of the coating type honeycomb monolithic regenerant is one of cordierite, mullite, stainless steel and ceramic, and the coating of the coating type honeycomb monolithic regenerant is composed of one or more of the oxides of aluminum and the oxides of magnesium, calcium, sodium, potassium and cerium.

2. The novel white clay bed of claim 1, wherein, The bottom of the bed body (6) is provided with liquid accumulation bag (13), and the liquid accumulation bag (13) is located below the liquid distributor (2), and the bottom of the liquid accumulation bag (13) is provided with a blowdown port (12).

3. The novel white clay bed of claim 2, wherein, The diameter of the liquid accumulation bag (13) is less than the diameter of the bed body (6).

4. The novel white clay bed of claim 3, wherein, The diameter of the liquid accumulation bag (13) is 1 / 6-1 / 2 of the diameter of the bed body (6).

5. The novel white clay bed of claim 1, wherein, The liquid distributor (2) has upward liquid discharge holes and downward liquid discharge holes.

6. The novel white clay bed of claim 1, wherein, The material of the coalescence water removal packing (3) is one or more of polypropylene, polytetrafluoroethylene and stainless steel.

7. The novel white clay bed of claim 1, wherein, A bypass filter (10) and a circulating pump (11) are provided, one end of the circulating pump (11) is connected to the lower part of the bed body (6), the other end is connected to the bypass filter (10), and the bypass filter (10) is connected to the upper part of the bed body (6).

8. The novel white clay bed of claim 1, wherein, The new clay bed is a hydrogenated clay bed or a post-treatment clay bed.

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