TWI683698B - Packed tower with composite filler - Google Patents

Abstract

A packed tower comprising at least one tower body and a composite filler material. The tower body has a filtered fluid inlet and a filtered fluid outlet. A composite filler material is disposed in the tower body to remove the oxidant in the liquid or gas phase. The composite filler material includes a first oxidant removal catalyst for treating the oxidant. The catalyst regenerated is used to regenerate the first oxidant removal catalyst.

Description

Packing tower of composite packing material

The invention relates to a packed tower of composite packing materials, and in particular to a packed tower of composite packing materials including an oxidant removing catalyst and a catalyst regenerant.

A packed tower is a mass transfer device commonly used in chemical production. It is mainly composed of a cylindrical tower body and a packing material installed in the tower. It is often used for filtration, absorption, distillation, extraction, etc. However, in the chemical production process, oxidants are often added for reaction. After the reaction is completed, the residual oxidants are difficult to remove.

In addition, after the chemical reaction between the oxides produced by the combustion of exhaust gas from the locomotives, factory exhaust gas and smoke containing chemical substances and sunlight, the resulting environmental ozone pollutants are also an oxidant that is difficult to remove. Ozone is far more reactive than oxygen and is a strong oxidant. It is harmful to animals and plants and many structural materials such as plastic and rubber.

Therefore, the development of a packed tower that can effectively remove oxidant components in the liquid or gas phase can be applied in the chemical production process or living environment, and is the goal of joint efforts of related industries.

The invention is a packed tower of composite packing material, which uses oxidizer to remove catalyst to process oxidant, and uses catalyst regenerator to activate and regenerate oxidant to remove catalyst to effectively remove oxidant. The present invention includes the following aspects.

According to one aspect of the present invention, a packed tower is provided, which includes at least a tower body and a composite packing material. The tower body has a filtered fluid inlet and a filtered fluid outlet. The composite packing material is carried in the tower body to remove the oxidant in the liquid or gas phase. The composite filler material includes a first oxidant removal catalyst to treat the oxidant. The catalyst regeneration agent is used to activate the first oxidant to remove the catalyst.

10, 20, 30‧‧‧ packed tower

100, 200, 300 ‧‧‧ tower

102‧‧‧Composite filling material

202, 204, 302, 304, 306‧‧‧filling layer

F‧‧‧Fluid inlet

O‧‧‧filtered fluid outlet

FIG. 1 is a schematic diagram of a packed tower with a single packed layer according to an embodiment of the invention.

FIG. 2 is a schematic diagram of a packed tower with double-layer filling layers according to an embodiment of the invention.

FIG. 3 is a schematic diagram of a packed tower with three packed layers according to an embodiment of the invention.

Please refer to FIG. 1, which illustrates a schematic diagram of a packed tower with a single packed layer according to an embodiment of the invention. As shown in FIG. 1, the packed tower 10 includes a tower body 100 and a composite packing material 102. The tower body 100 has a filtered fluid inlet F and a filtered fluid outlet O. The composite packing material 102 is carried in the tower body 100 to remove the oxidant in the liquid phase or the gas phase. The stacking method of the composite filling material 102 includes neat stacking, random stacking, layered arrangement according to different particle sizes, or mixed filling with different particle sizes. The aspect ratio of the tower body 100 may be 0.1-1.5 (diameter/height), preferably 1.0-1.5.

In one embodiment, the composite filler material 102 includes a first oxidant removal catalyst and a catalyst regeneration agent. The first oxidant removal catalyst is an oxidant trapping or decomposing material, which can be used to treat, for example, oxidants with a relatively high concentration, through the structural properties, impurities such as oxidants can be initially removed, and then permeabilization reaction can process oxidants with a concentration of, for example, 50ppm-10000ppm. The reaction rate is k [oxidant concentration] ⁿ [catalyst concentration] ^m , and 5>n, m>0. Among them, there may be different reaction pathways depending on the catalytic material used, and different reaction pathways will affect the reaction rate progression and/or the rate constant k value. The reaction rate of the oxidant removed by the first oxidant removal catalyst is related to the material size of the oxidant removal catalyst and the pore diameter of the porous material. The first oxidant removal catalyst may be a single material or a combination of plural materials, which has a reduced activation energy of the oxidant and catalyzes the reaction. Specifically, one or more reaction paths can be catalyzed to achieve an overall increase in reaction rate. The chemical treatment method is to use the oxidant to remove the oxidant adsorbed or combined on the catalyst surface, thereby providing different reaction paths for the oxidant. In this case, a low activation energy path is provided to increase the decomposition rate of the oxidant. The activation and regeneration of the oxidant to remove the catalyst is to use catalyst regenerant or other regeneration or activation procedures such as heat treatment or addition of reducing agent.

In one embodiment, the first oxidant removal catalyst can adsorb or decompose selected from ozone, oxygen, hydrogen peroxide, chlorate, perchlorate, potassium dichromate, potassium permanganate and peroxide Group, for example, the use ratio of carbon (activated carbon, coconut shell charcoal, charcoal, coal and modified carbon) covers 5% to 99% or preferably 10% to 80% or optimally 30% to 75% . Silicon (content covers 5%~99% or 10%~80% or 15%~60%), alumina (content 5%~99% or preferably 10%~95% or optimally 30%~ 90%), natural ore (such as zeolite), manganese, iron, platinum, palladium, ruthenium, vanadium, chromium, cobalt, copper, and nickel, of which manganese, iron, platinum, palladium, ruthenium, vanadium, chromium , Cobalt, copper and nickel metal content 0.5% ~ 80% or preferably 1% ~ 70% or most preferably 1% ~ 50%, and including its oxidation type. The catalyst regenerant is selected from the above materials (carbon, quartz sand, silicon, alumina, natural ore (e.g. zeolite), manganese, iron, platinum, palladium, ruthenium, vanadium, chromium, cobalt, copper and nickel Group), and contains a group consisting of components with higher oxidation potential such as heptamanganese dioxide, potassium permanganate or iron oxide.

The ratio of the first oxidant to remove the catalyst and the catalyst regenerant can be adjusted according to the type and concentration of the oxidant to be removed. The ratio is 0.1:1~99:1. Further, when the oxidant to be removed is hydrogen peroxide, the ratio of the first oxidant removal catalyst and the catalyst regeneration agent is in the range of 1:1 to 99:1, but the first oxidant removes the catalyst. When the ratio of media and catalyst regenerator is 4:1, it has the best use conditions. In another embodiment, when the pH of the treated oxidant solution is less than 7, and the hydrogen peroxide concentration is 8000 ppm, the ratio of the first oxidant to remove the catalyst and the catalyst regenerator is 1:1 to 9:1, which has the best Service life. When the pH of the treated oxidant solution is greater than 7, and the hydrogen peroxide concentration is 8000 ppm, the ratio of the first oxidant to remove the catalyst and the catalyst regenerator is 0.5:1~6:1, which has the best service life.

When the height of the packed tower is about 110 centimeters (cm) and the pH of the treated oxidant solution is between 4-10, the experimental data of hydrogen peroxide removal efficiency is shown in Table 1. The hydrogen peroxide removal filtration of Examples A and B reaches 100%, and the residual hydrogen peroxide has not been detected. The hydrogen peroxide removal filtration of Example C is up to 99%. It is obvious that the composite filling material provided by the embodiment of the present invention has an excellent removal effect.

In one embodiment, the composite filling material 102 further includes a second oxidant removal catalyst for treating the oxidant with a concentration ranging from 10 ppm to 4000 ppm. The reaction rate of the second oxidant removal catalyst and the oxidant treatment concentration are different from the selected components The ratio, pore size and particle size are related. For example, using a small particle size with large pores can help to increase the adsorption and removal of the oxidant on the surface of the material. The reaction by-products such as oxygen staying in the gap will shorten the time, which will help improve the reaction per unit time. The reaction rate is k[oxidant concentration] ^a [catalyst concentration] ^b , where 5>a, b>0. Among them, there may be different reaction pathways depending on the catalytic material used, and different reaction pathways will affect the reaction rate progression and/or the rate constant k value. The reaction rate of the second oxidant removal catalyst to remove the oxidant is related to the material size of the oxidant removal catalyst and the pore diameter of the porous material. The catalyst regeneration agent can be used to reduce (activate or regenerate) the first oxidant removal catalyst and the second oxidant removal catalyst, so that repeated use will cause the first oxidant removal catalyst and the second oxidant removal catalyst to age or fail, through regeneration The reduction of the agent can restore the activity of the first oxidant removal catalyst and the second oxidant removal catalyst without removing the first oxidant removal catalyst and the second oxidant removal catalyst or replacement from the packed tower 10 to improve the packed tower 10 Service life.

In one embodiment, both the first oxidant removal catalyst and the second oxidant removal catalyst will react at any concentration of oxidant, but the material design of the first oxidant removal catalyst and the second oxidant removal catalyst (e.g. Structural strength, pore size, etc.) are different, and can exhibit different true reaction rates at different concentrations. For example, the first oxidant removal catalyst (A material) can be made of a material with a hard structure suitable for direct contact with high concentration of oxidant, but its pores are reduced due to the by-products generated after the reaction and the overall reaction performance is reduced, so that the treated oxidant drops from 10000ppm Up to 4000ppm, at this time, the optional B material, which is weaker than the A material but has the advantage of lighter weight or smaller particles, is used as the second oxidant to remove the catalyst and continue to process the residual oxidant.

In an embodiment, the composite filler material may include a first oxidant removal catalyst and a second oxidant removal catalyst, selected from carbon, quartz sand, silicon, alumina, natural ore (such as zeolite), manganese , Iron, platinum, palladium, ruthenium, vanadium, chromium, cobalt, copper and nickel, the above materials can be Fine sand, granular, spherical, irregular, brick, plate, column, honeycomb, porous material in any form or combination of different shapes. And the composite filling material is granular or spherical and has a particle size or diameter of 0.5 mm to 10 cm, or the composite filling material is brick, plate or column and has a side length of 0.1 mm to 100 cm. In addition to being used as a catalyst to treat oxidants, the composite filler may also have a physical filtering effect. Depending on the size, particle size or structure of the filler, it can remove particulate impurities above 1 μm.

In an embodiment, the packed tower may include a plurality of tower bodies arranged in series with each other, and the setting mode may be adjusted according to the type of oxidant actually filtered, and at the same time, a suitable composition may be adjusted according to the concentration of the oxidant at the outlet of each packed tower, for example, hydrogen peroxide in the first packed tower After the concentration is 8000ppm, the residual is less than 4000ppm, then the second packed tower can choose the high proportion of the second oxidant to remove the catalyst ratio for hydrogen peroxide removal.

In one embodiment, the filling layer of the composite filling material can also be mixed and spaced by using materials of different sizes according to requirements.

FIG. 2-3 are schematic diagrams of packed towers with double and triple packed layers according to an embodiment of the invention, respectively. Referring to FIG. 2, the packed tower 20 includes a tower body 200, a first packed layer 202, and a second packed layer 204, and is carried in the tower body 200 to remove the oxidant in the liquid phase or the gas phase. The tower body 200 has a filtered fluid inlet F and a filtered fluid outlet O. The stacking method of each layer includes neat stacking, random stacking, layered arrangement according to different particle sizes or mixed filling of different particle sizes. The material of the first filling layer 202 may be any one or a mixture of the first oxidant removing catalyst and the second oxidant removing catalyst, and the material of the second filling layer 204 may be the first oxidizing agent removing catalyst and the second oxidant Remove either or both of the catalyst. In addition, the materials of the first filling layer 202 and the second filling layer 204 may be the same or different. The first oxidant removes the catalyst and The material selection of the second oxidant removal catalyst has been described above, and will not be repeated here. In one embodiment, the material size of the first filling layer 202 is smaller than the material size of the second filling layer 204.

Referring to FIG. 3, the packed tower 30 includes a tower body 300, a first packed layer 302, a second packed layer 304, and a third packed layer 306, and is carried in the tower body 300 to remove the oxidant in the liquid phase or the gas phase. The tower body 300 has a filtered fluid inlet F and a filtered fluid outlet O. The stacking method of each layer includes neat stacking, random stacking, layered arrangement according to different particle sizes or mixed filling of different particle sizes. The materials of the first filling layer 302, the second filling layer 304, and the third filling layer 306 can be either or both of the first oxidant removal catalyst and the second oxidant removal catalyst, and the first filling layer 302 2. The materials of the second filling layer 304 and the third filling layer 306 may be the same or different. The material selection of the first oxidant removal catalyst and the second oxidant removal catalyst has been described above, and will not be repeated here. In an embodiment, the material size of the first filling layer 302 is smaller than the material size of the second filling layer 304, and the material size of the second filling layer 304 is smaller than the material size of the third filling layer 306.

In an embodiment, the composite filler material is porous, which can increase the surface area and improve the efficiency of processing the oxidant. From the direction of the filter fluid inlet F to the direction of the filter fluid outlet O, the size of the porous composite packing material is arranged from small to large, so that the size of the porous composite packing material filled closer to the upper part of the tower of the filter fluid inlet F is smaller, for example, the size The first oxidant is 0.6mm~1.5mm to remove the catalyst. The particles above 3μm can be preliminarily filtered out. When reacting with the oxidant, the oxidant to be treated will infiltrate into the pores of the porous material and be adsorbed or react internally. The gas generated during the hour reaction has the shortest path to escape from the inside of the material pores and the residence time is also short, and the reaction rate is the fastest, which can reduce the gas expansion and expand the pores to cause damage to the material structure. The porous composite packing material filled in the lower part of the tower closer to the filter fluid outlet O is larger in size, for example, the second oxidant with a size of 1 mm to 10 mm removes the catalyst, the gas escape path when reacting with the oxidant is longer, and the reaction rate is the most slow. In this way, can In the first stage, the high concentration of oxidant can be treated first, and the concentration of oxidant can be reduced. When the fluid enters and then enters the second stage, the low concentration of oxidant is processed, that is, when the filtered fluid enters the tower body to remove residual oxidant, because Reduced oxidant treatment, avoiding medium and large particles when directly processing high concentration oxidant, because the oxidant enters the hole to react to produce gas, destroying the structure of the porous composite filling material.

In addition, it can be cleaned by backwashing, that is, by inverting the tower and washing it with cleaning fluid from the filter fluid outlet O to the filter fluid inlet F, small particles and blocked impurities can be washed away to remove dirt, The service life of the packed tower can be extended. In addition, when the packed tower is used for a period of time, it can directly supplement the composite packing materials of various particle sizes through the upper part of the tower body (the area of the filter fluid inlet F), and then through the rapid backwashing bed, it can be rearranged to obtain the filter fluid inlet From F to the direction of the filter fluid outlet O, the composite filling materials are arranged from small to large. If the porous composite filler material is damaged and becomes small-sized particles, it can also be rearranged through backwashing to supplement the filling area of the upper and middle layers to supplement the small-sized porous composite filler material. The above embodiment of backwashing is applicable to the structure in which the packed tower has two or more packed layers.

In summary, through the packed tower of the composite packing material, the oxidant is used to remove the catalyst to treat the oxidant, and the catalyst regenerant is used to activate and regenerate the oxidant to remove the catalyst, which can effectively remove the oxidant in the liquid phase or gas phase. It can also filter particles that exceed impurities, removing filtration up to 80%-100%.

10‧‧‧packed tower

100‧‧‧ Tower

102‧‧‧Composite filling material

F‧‧‧Fluid inlet

O‧‧‧filtered fluid outlet

Claims (10)

A packed tower includes: at least one tower body with a filtered fluid inlet and a filtered fluid outlet; and a composite packing material, carried in at least the tower body, for removing oxidant in liquid phase or gas phase, wherein The composite filling material includes: a first oxidant removal catalyst to treat the oxidant; and a catalyst regenerator to activate the first oxidant to remove the catalyst, wherein, when the pH of the treated oxidant solution is less than 7, , The ratio of the first oxidant removal catalyst and the catalyst regeneration agent is 1:1~9:1, and when the pH of the oxidant solution treated is greater than 7, the first oxidant removal catalyst and the solid catalyst regeneration agent The ratio is 0.5:1~6:1. The packed tower as described in item 1 of the patent application scope, wherein the first oxidant removal catalyst is used to treat the oxidant with a concentration of 50ppm-10000ppm, and the composite packing material further includes a second oxidant removal catalyst, used An oxidant with a concentration of 10 ppm to 4000 ppm is processed and the catalyst regenerant is used to reduce the first oxidant removal catalyst and the second oxidant removal catalyst. The packed tower as described in item 2 of the patent application scope, wherein the first oxidant removal catalyst and the second oxidant removal catalyst of the composite packing material are oxidant trapping or decomposing materials. The packed tower as described in item 2 of the patent application scope, wherein the first oxidant removal catalyst and the second oxidant removal catalyst are used to capture or decompose selected from ozone, oxygen, hydrogen peroxide, chlorate, perchloric acid The group consisting of salt, potassium dichromate, potassium permanganate and peroxide. The packed tower as described in item 1 of the patent application scope, wherein a plurality of tower bodies of the at least one tower system are arranged in series with each other. A packed tower as described in item 1 of the scope of the patent application, wherein the composite packing material includes a single layer or multiple layers, and the stacking method of each layer includes neatly stacked, randomly stacked, layered arrangement according to different particle sizes or mixed filling with different particle sizes . The packed tower as described in item 2 of the patent application scope, wherein the first oxidant removal catalyst and the second oxidant removal catalyst are selected from carbon, quartz sand, silicon, alumina, natural ore, manganese, iron , Platinum, palladium, ruthenium, vanadium, chromium, cobalt, copper and nickel, and the catalyst regeneration agent is selected from carbon, quartz sand, silicon, alumina, natural ore, manganese, iron, platinum, The base materials of palladium, ruthenium, vanadium, chromium, cobalt, copper and nickel contain a group consisting of components of heptamanganese dioxide, potassium permanganate or iron oxide. The packed tower as described in item 1 of the patent application scope, wherein the composite packing material is granular or spherical and has a particle size or diameter of 0.5 mm to 10 cm, or the composite packing material is brick, plate or column And has a side length of 0.1mm ~ 100cm. The packed tower as described in item 1 of the patent application scope, wherein the composite packing material includes two layers, and a direction from the filtered fluid inlet to the filtered fluid outlet is a first packed layer and a second packed layer in sequence, The material size of the first filling layer is smaller than the material size of the second filling layer. The packed tower according to item 1 of the patent application scope, wherein the composite packing material includes at least three layers, and a direction from the filter fluid inlet to the filter fluid outlet is a first packing layer and a second packing layer in this order And a third filling layer, wherein the material size of the first filling layer is smaller than the material size of the second filling layer, and the material size of the second filling layer is smaller than the material size of the third filling layer.

Images