Peroxyacetic acid tail gas treatment device and treatment process thereof

Abstract

The application provides a peracetic acid tail gas treatment device, which comprises a peracetic acid tail gas treatment device shell, a peracetic acid tail gas adsorber, a gas inlet interface and a discharge port; the peracetic acid adsorption device comprises one or more peracetic acid adsorbers; the peracetic acid adsorber is provided with a peracetic acid adsorbent; and the peracetic acid adsorbent is an activated carbon-based basic carbonate-alkaline bicarbonate composite adsorbent. The peracetic acid tail gas treatment device and the corresponding treatment process provided by the application can effectively remove and adsorb peracetic acid, hydrogen peroxide and acetic acid in tail gas generated by a peracetic acid sterilizer, the concentration values of peracetic acid, hydrogen peroxide and acetic acid in the environment are less than the specified values, the direct discharge standard is reached, the tail gas adsorption and decomposition efficiency is high, the installation and replacement are convenient, and the device is pollution-free, and the use efficiency and sterilization efficiency of the peracetic acid sterilizer are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of peracetic acid sterilizer exhaust gas treatment technology, and relates to a peracetic acid exhaust gas treatment device and a peracetic acid exhaust gas treatment method, particularly a peracetic acid exhaust gas treatment device and a peracetic acid exhaust gas treatment process. Background Technology

[0002] For sterilizing medical devices that cannot withstand high temperature and high pressure environments, hydrogen peroxide low-temperature plasma sterilization is typically used. However, with the development of medical technology, more and more precision instruments are being used in surgery. Traditional hydrogen peroxide low-temperature plasma sterilization is ineffective for slender instruments, especially blind-ended luminal instruments; furthermore, hydrogen peroxide, as a strong oxidant, has a corrosive effect on some instruments. Therefore, hydrogen peroxide alone cannot completely handle the sterilization of slender luminal instruments.

[0003] Peracetic acid sterilizers are gaining acceptance due to their low corrosivity and strong sterilization capabilities. However, after sterilization, peracetic acid sterilizers produce a large amount of pungent, acidic odor in the environment, and the concentrations of peracetic acid, hydrogen peroxide, and acetic acid exceed the occupational health regulations for toxic and harmful gases in the workplace, directly hindering the promotion and use of peracetic acid low-temperature sterilizers. Traditional peracetic acid sterilizers treat exhaust gases using direct discharge or activated carbon filtration, but neither method can filter or eliminate the acidic ions from the peracetic acid sterilizer.

[0004] Therefore, finding a more suitable treatment method to effectively remove the acidic exhaust gas from peracetic acid and solve the problems existing in the current traditional treatment methods has become one of the urgent problems to be solved. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a peracetic acid tail gas treatment device and a peracetic acid tail gas treatment method. The peracetic acid tail gas treatment device provided by the present invention solves the shortcomings of the prior art, eliminates the problem of a large amount of sour and pungent odor generated during the sterilization process of peracetic acid sterilizers, and makes the concentration values ​​of peracetic acid, hydrogen peroxide and acetic acid in the environment lower than the values ​​specified by national standards, further broadening the depth and breadth of the application of peracetic acid in the field of medical devices, and the device is closer to practical applications.

[0006] This invention provides a peracetic acid tail gas treatment device, including a peracetic acid tail gas treatment device housing, a peracetic acid tail gas adsorber, an air inlet, and an outlet.

[0007] The peracetic acid adsorption device includes one or more peracetic acid adsorbers;

[0008] The peracetic acid adsorber is equipped with a peracetic acid adsorbent.

[0009] The peracetic acid adsorbent is an activated carbon-based basic carbonate-basic bicarbonate composite adsorbent.

[0010] Preferably, the air inlet is located at the bottom of the housing of the peracetic acid tail gas treatment device;

[0011] The peracetic acid tail gas treatment device has a gas passage inside its housing.

[0012] The inlet at the bottom of the peracetic acid tail gas adsorber is detachably fixed to the housing of the peracetic acid tail gas treatment device and is connected to the gas channel inside the housing.

[0013] The top of the peracetic acid tail gas adsorber is provided with an outlet.

[0014] The discharge port is located at the bottom of the housing of the peracetic acid tail gas treatment device.

[0015] Preferably, the peracetic acid adsorber includes an outer shell, an outer shell cover, a support plate, a filter screen, and a peracetic acid adsorbent;

[0016] The peracetic acid adsorber is specifically a hollow columnar peracetic acid adsorber;

[0017] The peracetic acid adsorber is provided with a support plate, a filter screen, peracetic acid adsorbent, a filter screen, and a support plate arranged from bottom to top.

[0018] The peracetic acid adsorber is provided with an outer shell cover plate with a hollow structure at the top.

[0019] The peracetic acid tail gas treatment device is an integrated peracetic acid tail gas treatment device.

[0020] Preferably, the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent comprises an activated carbon support and basic carbonate and basic bicarbonate supported on the activated carbon support.

[0021] The activated carbon carrier is obtained by kneading, activating, and expanding the pores of activated carbon.

[0022] The particle size of the activated carbon carrier is 2.8–3.2 mm;

[0023] The activated carbon support has a pore size of 5.0–5.5 nm;

[0024] The specific surface area of ​​the activated carbon carrier is 900–920 m². 2 / g;

[0025] The iodine value of the activated carbon carrier is ≥900 mg / g.

[0026] Preferably, the basic carbonate includes sodium carbonate and / or potassium carbonate;

[0027] The basic bicarbonate includes potassium bicarbonate and / or sodium bicarbonate.

[0028] The mass ratio of the basic carbonate to the basic bicarbonate is 1:1.

[0029] Preferably, the activated carbon support is further loaded with alkali metal oxides;

[0030] The alkali metal oxides include sodium oxide and / or potassium oxide;

[0031] The hardness of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent is 30–31 N / cm. 2 ;

[0032] The wear index of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent is 4.8% to 5%.

[0033] Preferably, the air inlet of the peracetic acid tail gas treatment device is used to connect to the tail gas of the peracetic acid sterilizer;

[0034] The peracetic acid tail gas treatment device also includes a conveying device and / or an oil filter;

[0035] The air inlet of the peracetic acid tail gas treatment device is connected to the tail gas of the peracetic acid sterilizer via a conveying device.

[0036] An oil filter is installed between the air inlet of the peracetic acid tail gas treatment device and the conveying device.

[0037] This invention provides a method for treating peracetic acid tail gas, comprising the following steps:

[0038] The peracetic acid tail gas is transported to the treatment device, and after being treated by the peracetic acid adsorbent, the treated gas is obtained.

[0039] The peracetic acid adsorbent is an activated carbon-based basic carbonate-basic bicarbonate composite adsorbent.

[0040] Preferably, the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent comprises an activated carbon support and basic carbonate and basic bicarbonate supported on the activated carbon support.

[0041] The preparation process of the activated carbon carrier includes the following steps:

[0042] 1) After mixing activated carbon, binder, functional additives and water and aging, the mixture is extruded and dried to obtain primary activated carbon.

[0043] 2) After mixing the primary activated carbon, activator and water obtained in the above steps again, the mixture is activated at high temperature under a protective atmosphere to obtain activated primary activated carbon.

[0044] 3) The activated primary activated carbon obtained in the above steps is subjected to steam distillation for secondary pore expansion to obtain an activated carbon carrier.

[0045] The adhesive includes sodium carboxymethyl cellulose and / or polyvinyl alcohol;

[0046] The functional additives include potassium carbonate;

[0047] The aging time is 3.0–3.2 hours;

[0048] The drying and molding temperature is 450–455°C;

[0049] The activator includes dipotassium hydrogen phosphate and / or potassium dihydrogen phosphate;

[0050] The high-temperature activation temperature is 700–800°C;

[0051] The steam pressure of the water vapor is 0.5–1 MPa;

[0052] The secondary reaming time is 3.0 to 3.2 hours.

[0053] Preferably, the preparation process of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent includes the following steps:

[0054] (1) After mixing basic carbonate, basic bicarbonate, activated carbon carrier and water, the mixture is aged and then calcined under a protective atmosphere to obtain activated carbon-based basic carbonate-basic bicarbonate composite adsorbent.

[0055] The aging time is 3.0–3.2 hours;

[0056] The total loading of the basic carbonate and basic bicarbonate is 29.8 wt% to 31.2 wt%.

[0057] The roasting temperature is 270–300°C;

[0058] The roasting time is 3.0–3.3 h;

[0059] During the preparation process, some basic carbonates and / or basic bicarbonates decompose to form alkali metal oxides.

[0060] This invention provides a peracetic acid tail gas treatment device, comprising a peracetic acid tail gas treatment device shell, a peracetic acid tail gas adsorber, an inlet port, and an outlet port. The peracetic acid adsorption device includes one or more peracetic acid adsorbers; each peracetic acid adsorber contains a peracetic acid adsorbent; the peracetic acid adsorbent is an activated carbon-based basic carbonate-basic bicarbonate composite adsorbent. Compared with traditional direct emission methods and activated carbon methods, the peracetic acid tail gas treatment device and corresponding treatment process provided by this invention can effectively remove and adsorb peracetic acid, hydrogen peroxide, and acetic acid in the tail gas generated by peracetic acid sterilizers. The concentrations of peracetic acid, hydrogen peroxide, and acetic acid in the environment are less than the specified values, meeting the standards for direct emission. It has the advantages of high tail gas adsorption and decomposition efficiency, convenient installation and replacement, and no pollution, greatly improving the utilization efficiency and sterilization efficiency of peracetic acid sterilizers. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the peracetic acid tail gas treatment process provided by the present invention.

[0062] Figure 2 A schematic diagram illustrating the preparation principle of the peracetic acid adsorbent and highly active activated carbon-based carrier provided by this invention;

[0063] Figure 3 A simplified schematic diagram of the peracetic acid tail gas adsorber provided by the present invention;

[0064] Figure 4 A simplified schematic diagram of the peracetic acid tail gas treatment device provided by the present invention;

[0065] Figure 5 A simplified structural diagram of the peracetic acid sterilizer exhaust gas treatment device provided by the present invention. Detailed Implementation

[0066] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention and not for limiting the claims of the present invention.

[0067] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0068] There are no particular restrictions on the purity of any of the raw materials used in this invention. However, it is preferable to use medical-grade pure or conventionally pure materials used in the field of medical disinfection devices.

[0069] All raw materials of this invention are conventional in the field, and each brand name and abbreviation is clear and distinct in its relevant application. Those skilled in the art can purchase them from the market or prepare them by conventional methods based on the brand name, abbreviation and corresponding application.

[0070] All processes in this invention are referred to by abbreviations that are common abbreviations in the field. Each abbreviation is clear and specific in its relevant application area, and those skilled in the art can understand its conventional process steps based on the abbreviation.

[0071] This invention provides a peracetic acid tail gas treatment device, including a peracetic acid tail gas treatment device housing, a peracetic acid tail gas adsorber, an air inlet, and an outlet.

[0072] The peracetic acid adsorption device includes one or more peracetic acid adsorbers;

[0073] The peracetic acid adsorber is equipped with a peracetic acid adsorbent.

[0074] The peracetic acid adsorbent is an activated carbon-based basic carbonate-basic bicarbonate composite adsorbent.

[0075] In this invention, the air inlet is preferably located at the bottom of the housing of the peracetic acid tail gas treatment device.

[0076] In this invention, a gas passage is preferably provided inside the housing of the peracetic acid tail gas treatment device.

[0077] In this invention, the inlet at the bottom of the peracetic acid tail gas adsorber is preferably detachably fixed to the housing of the peracetic acid tail gas treatment device and connected to the gas channel inside the housing.

[0078] In this invention, the top of the peracetic acid tail gas adsorber is preferably provided with an outlet.

[0079] In this invention, the discharge port is preferably located at the bottom of the housing of the peracetic acid tail gas treatment device.

[0080] In this invention, the peracetic acid adsorber preferably includes an outer shell, an outer shell cover plate, a support plate, a filter screen, and a peracetic acid adsorbent.

[0081] In this invention, the peracetic acid adsorber is preferably a hollow columnar peracetic acid adsorber.

[0082] In this invention, the peracetic acid adsorber preferably contains, from bottom to top, a support plate, a filter screen, a peracetic acid adsorbent, a filter screen, and a support plate.

[0083] In this invention, the top of the peracetic acid adsorber is preferably provided with a shell cover plate with a hollow structure.

[0084] In this invention, the peracetic acid tail gas treatment device is preferably an integrated peracetic acid tail gas treatment device.

[0085] In this invention, the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent preferably includes an activated carbon support and basic carbonates and basic bicarbonates supported on the activated carbon support.

[0086] In this invention, the activated carbon carrier is preferably obtained by kneading, activating, and expanding the pores of activated carbon.

[0087] In this invention, the particle size of the activated carbon carrier is preferably 2.8-3.2 mm, more preferably 2.85-3.15 mm, more preferably 2.9-3.1 mm, and even more preferably 2.95-3.05 mm.

[0088] In this invention, the pore size of the activated carbon carrier is preferably 5.0-5.5 nm, more preferably 5.1-5.4 nm, and even more preferably 5.2-5.3 nm.

[0089] In this invention, the specific surface area of ​​the activated carbon carrier is preferably 900–920 m². 2 / g, more preferably 904-916m 2 / g, more preferably 908-912m 2 / g.

[0090] In this invention, the iodine value of the activated carbon carrier is preferably ≥900mg / g, more preferably ≥910mg / g, and even more preferably ≥920mg / g.

[0091] In this invention, the basic carbonate preferably includes sodium carbonate and / or potassium carbonate, more preferably sodium carbonate or potassium carbonate.

[0092] In this invention, the basic bicarbonate preferably includes potassium bicarbonate and / or sodium bicarbonate, more preferably potassium bicarbonate or sodium bicarbonate.

[0093] In this invention, the preferred mass ratio of the basic carbonate to the basic bicarbonate is 1:1. Specifically, the content of the basic carbonate and basic bicarbonate is related to the weight of the adsorbent and maintains a 1:1 relationship.

[0094] In this invention, the activated carbon support preferably also contains alkali metal oxides. That is, the peracetic acid adsorbent of this invention is an activated carbon-based alkali metal oxide-basic carbonate-basic bicarbonate composite adsorbent.

[0095] In this invention, the alkali metal oxide preferably includes sodium oxide and / or potassium oxide, more preferably sodium oxide or potassium oxide. Specifically, the sodium oxide and / or potassium oxide in the alkali metal oxide are products of the decomposition of carbonates and bicarbonates, products produced at a certain temperature, and are present in small quantities.

[0096] In this invention, the hardness of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent is preferably 30-31 N / cm. 2 More preferably, it is 30.2–30.8 N / cm. 2 More preferably, it is 30.4–30.6 N / cm. 2 .

[0097] In this invention, the wear index of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent is preferably 4.8% to 5%, more preferably 4.84% to 4.96%, and even more preferably 4.88% to 4.92%.

[0098] In this invention, the air inlet of the peracetic acid tail gas treatment device is preferably used to connect to the tail gas of the peracetic acid sterilizer.

[0099] In this invention, the peracetic acid tail gas treatment device preferably includes a conveying device and / or an oil filter, more preferably a conveying device or an oil filter.

[0100] In this invention, the air inlet of the peracetic acid tail gas treatment device is preferably connected to the tail gas of the peracetic acid sterilizer via a conveying device.

[0101] In this invention, an oil filter is preferably installed between the air inlet of the peracetic acid tail gas treatment device and the conveying device.

[0102] This invention provides a method for treating peracetic acid tail gas, comprising the following steps:

[0103] The peracetic acid tail gas is transported to the treatment device, and after being treated by the peracetic acid adsorbent, the treated gas is obtained.

[0104] The peracetic acid adsorbent is an activated carbon-based basic carbonate-basic bicarbonate composite adsorbent.

[0105] In this invention, the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent preferably includes an activated carbon support and basic carbonates and basic bicarbonates supported on the activated carbon support.

[0106] In this invention, the preparation process of the activated carbon carrier preferably includes the following steps:

[0107] 1) After mixing activated carbon, binder, functional additives and water and aging, the mixture is extruded and dried to obtain primary activated carbon.

[0108] 2) After mixing the primary activated carbon, activator and water obtained in the above steps again, the mixture is activated at high temperature under a protective atmosphere to obtain activated primary activated carbon.

[0109] 3) The activated primary activated carbon obtained in the above steps is subjected to steam distillation for secondary pore expansion to obtain an activated carbon carrier.

[0110] The present invention first mixes activated carbon, binder, functional additives and water and ages them, and then extrudes and dries them to obtain primary activated carbon.

[0111] In this invention, the adhesive preferably comprises sodium carboxymethyl cellulose and / or polyvinyl alcohol, more preferably sodium carboxymethyl cellulose or polyvinyl alcohol.

[0112] In this invention, the functional additive preferably includes potassium carbonate.

[0113] In this invention, the aging time is preferably 3.0 to 3.2 hours, more preferably 3.04 to 3.16 hours, and even more preferably 3.08 to 3.12 hours.

[0114] In this invention, the drying and molding temperature is preferably 450-455°C, more preferably 451-454°C, and even more preferably 452-453°C.

[0115] In this invention, the primary activated carbon, activator, and water obtained in the above steps are mixed again and then activated at high temperature under a protective atmosphere to obtain activated primary activated carbon.

[0116] In this invention, the activator preferably includes dipotassium hydrogen phosphate and / or potassium dihydrogen phosphate, more preferably dipotassium hydrogen phosphate or potassium dihydrogen phosphate.

[0117] In this invention, the temperature for high-temperature activation is preferably 700-800°C, more preferably 720-780°C, and even more preferably 740-760°C.

[0118] Finally, the activated primary activated carbon obtained from the above steps is subjected to secondary pore expansion by steam distillation to obtain an activated carbon carrier.

[0119] In this invention, the steam pressure of the water vapor is preferably 0.5-1 MPa, more preferably 0.6-0.9 MPa, and even more preferably 0.7-0.8 MPa.

[0120] In this invention, the secondary hole enlargement time is preferably 3.0 to 3.2 hours, more preferably 3.04 to 3.16 hours, and even more preferably 3.08 to 3.12 hours.

[0121] In this invention, the preparation process of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent preferably includes the following steps:

[0122] (1) After mixing basic carbonate, basic bicarbonate, activated carbon carrier and water, the mixture is aged and then calcined under a protective atmosphere to obtain activated carbon-based basic carbonate-basic bicarbonate composite adsorbent.

[0123] In this invention, the aging time is preferably 3.0 to 3.2 hours, more preferably 3.04 to 3.16 hours, and even more preferably 3.08 to 3.12 hours.

[0124] In this invention, the total loading of the basic carbonate and basic bicarbonate is preferably 29.8 wt% to 31.2 wt%, more preferably 30.1 wt% to 30.9 wt%, and even more preferably 30.4 wt% to 30.6 wt%.

[0125] In this invention, the roasting temperature is preferably 270-300°C, more preferably 275-295°C, and even more preferably 280-290°C.

[0126] In this invention, the roasting time is preferably 3.0 to 3.3 h, more preferably 3.05 to 3.25 h, and even more preferably 3.1 to 3.2 h.

[0127] In this invention, during the preparation process, some basic carbonates and / or basic bicarbonates preferably decompose to form alkali metal oxides.

[0128] To complete and refine the overall technical solution, better ensure the stable operation of the peracetic acid tail gas treatment device, and further improve the treatment effect of peracetic acid tail gas, the above-mentioned peracetic acid tail gas treatment device and peracetic acid tail gas treatment process specifically include the following:

[0129] The peracetic acid tail gas treatment device and its treatment process include: a peracetic acid tail gas treatment device and a peracetic acid adsorber. The tail gas treatment device is an integrated structure, fixed on the peracetic acid sterilizer. Four sets of peracetic acid adsorption filters are fixed to the four upper outlets of the tail gas treatment device via threaded connections. The tail gas inlet of the tail gas treatment device is connected to an oil filter and a vacuum pump via a corrugated pipe. A large amount of tail gas generated during the sterilization process of the peracetic acid sterilizer is extracted by the vacuum pump, filtered by the oil filter to remove oil carried by the vacuum pump, and then enters the peracetic acid tail gas treatment device. Finally, after being filtered and adsorbed by the four peracetic acid filters, the qualified tail gas is directly discharged into the environment.

[0130] When the peracetic acid adsorbent reacts with the exhaust gas, some water is produced. Due to the high exhaust gas emission rate, the oil filter cannot completely filter the oil in the exhaust gas. Therefore, a drain port is set at the bottom of the exhaust gas emission device. The drain port is connected to a manual ball valve, which is manually opened to discharge the mixture of water vapor and oil in the exhaust gas treatment device.

[0131] The peracetic acid tail gas treatment device consists of peracetic acid adsorbent, outer shell, filter wire mesh, support plate, O-ring seal, and outer shell cover.

[0132] Specifically, the outer shell is a black, cylindrical, hollow shell integrally injection molded from PP material. A threaded interface is located at the bottom, connecting to the upper exhaust port of the peracetic acid tail gas treatment device. A fluororubber O-ring seal is used at the connection to ensure good airtightness of the upper exhaust port connection. The peracetic acid adsorbent is evenly and densely packed into the cylindrical hollow shell. Filter wire mesh and support plates are installed at both the top and bottom of the peracetic acid adsorbent. Finally, the outer shell cover is embedded into the cylindrical hollow shell. The peracetic acid tail gas decomposer is replaceable as a whole. When the adsorbent is completely ineffective, and the machine is shut down with no tail gas discharge, the ineffective peracetic acid tail gas decomposer can be manually removed from the tail gas treatment device. Furthermore, the ineffective peracetic acid adsorbent has no environmental impact.

[0133] In this invention, since the main components of the peracetic acid tail gas are peracetic acid, hydrogen peroxide, and acetic acid, and the tail gas emission rate is 16m... 3 / h. Therefore, this invention also designs a green adsorbent for peracetic acid that is highly efficient, multifunctional, has low pressure drop, and rapid adsorption. This adsorbent is composed of activated carbon and alkaline substances. The activated carbon is kneaded, activated, and expanded to increase its pore volume and specific surface area, thereby enhancing its comprehensive ability to capture and adsorb acids, hydrogen peroxide, and water. At the same time, it ensures a high exhaust gas throughput and prevents exhaust obstruction such as pressure buildup. The alkaline substances can directly decompose peracetic acid and hydrogen peroxide in the exhaust gas, and simultaneously undergo a rapid chemical neutralization reaction with acetic acid in the exhaust gas to generate acetate, which has no impact on the environment. It also has the ability to adsorb a large amount of water produced by the neutralization reaction, thus achieving rapid and efficient removal of peracetic acid, hydrogen peroxide, and acetic acid from the exhaust gas.

[0134] See Figure 1 , Figure 1 The schematic diagram of the peracetic acid tail gas treatment process provided by the present invention.

[0135] The processing principle provided by this invention is to achieve efficient and rapid removal of peracetic acid and acetic acid through the synergistic enhancement effect of activated carbon with activated pores and chemical scavenging agents.

[0136] (1) The activated carbon is kneaded, activated and expanded to increase its pore volume and specific surface area, so as to enhance its comprehensive ability to capture and adsorb acid, hydrogen peroxide and water, while ensuring the high pass rate of exhaust gas and preventing the phenomenon of poor exhaust such as pressure buildup.

[0137] (2) Alkaline substances are used to neutralize peracetic acid and acetic acid in the exhaust gas to generate environmentally harmless acetate. Potassium bicarbonate and sodium bicarbonate can be partially decomposed during the preparation of the adsorbent to produce oxides, which can promote the decomposition of hydrogen peroxide and neutralize peracetic acid and acetic acid, further enhancing the overall adsorption and acid treatment capacity of the adsorbent.

[0138] Metal oxides have catalytic decomposition activity for hydrogen peroxide, and it is necessary to take into account the neutralization of peracetic acid and acetic acid. Therefore, alkaline metal compounds are selected. Substances that easily decompose to form alkaline oxides mainly include nitrates, carbonates, and bicarbonates of alkaline metals.

[0139] Nitrates, when heated, readily produce harmful nitrogen oxides, failing to meet environmental protection requirements. Both basic carbonates and basic bicarbonates can decompose into alkali metal oxides at certain temperatures, with basic bicarbonates decomposing more readily than basic carbonates. Furthermore, both basic carbonates and bicarbonates are alkaline, but the neutralizing ability of basic metal carbonates is higher than that of basic metal bicarbonates. Considering the alkalinity of basic carbonates and bicarbonates, as well as the alkalinity of the alkali metals, Na and K are the most suitable elements.

[0140] Comprehensive analysis suggests that the main chemical components of the activated carbon-based composite multifunctional green and efficient adsorbent should be potassium carbonate, potassium bicarbonate, sodium carbonate, and sodium bicarbonate. Potassium bicarbonate and sodium bicarbonate can partially decompose during the adsorbent preparation process to produce oxides, which can promote the decomposition of hydrogen peroxide and neutralize peracetic acid and acetic acid, further enhancing the overall adsorption and acid treatment capacity of the adsorbent. Potassium carbonate, potassium bicarbonate, sodium carbonate, and sodium bicarbonate all undergo neutralization reactions with peracetic acid and acetic acid in the exhaust gas to generate environmentally harmless acetate. The main components of the activated carbon-based composite multifunctional green and efficient adsorbent are activated carbon, potassium carbonate, potassium bicarbonate, sodium carbonate, and sodium bicarbonate.

[0141] The manufacturing process of peracetic acid adsorbent is as follows:

[0142] (1) Prepare an aqueous solution of potassium carbonate, potassium bicarbonate, sodium carbonate and sodium bicarbonate of a certain concentration according to the optimal loading and the amount of columnar activated carbon (prepared according to the equivalent amount of water with the saturated water absorption rate of the activated carbon), saturate impregnate and age, filter and dry.

[0143] (2) The carbon dioxide is calcined at 270-300℃ under a nitrogen atmosphere. During the calcination process, the carbonate and bicarbonate partially decompose to form a metal oxide-basic carbonate-basic bicarbonate composite multifunctional green and efficient adsorbent, thus obtaining the target product-activated carbon-based composite multifunctional green and efficient adsorbent (peracetic acid adsorbent).

[0144] After the peracetic acid adsorbent is produced, it needs to be tested using a pH measurement method. The activated carbon-based composite multifunctional green and efficient adsorbent needs to be sealed and stored away from light, heat, and chemicals.

[0145] See Figure 2 , Figure 2 The schematic diagram illustrates the preparation principle of the highly active activated carbon-based carrier for the peracetic acid adsorbent provided by this invention.

[0146] Because wood-based activated carbon has a wide adsorption range, good adsorption performance, and stable physicochemical properties, it can be modified and improved in a secondary process to enhance its toughness. Depending on the operating conditions, it can be prepared in a targeted manner, chemically modified, multi-stage pore expansion, and mechanical granulation to achieve the preparation of catalytic-adsorption carriers with high activity, high specific surface area, and high porosity, which can effectively meet the actual needs of various working environments.

[0147] Therefore, wood-based activated carbon is used as an adsorption carrier that can be further processed.

[0148] The preparation steps for highly active activated carbon-based supports are as follows:

[0149] (1) Mixing and kneading to form.

[0150] Take activated carbon, binder, water equivalent to the saturated water absorption rate of the activated carbon, and functional additives, mix and age them at room temperature, extrude and mold them, dry and mold them under a nitrogen atmosphere, cut them into sections, and obtain primary columnar activated carbon.

[0151] (2) Chemical activation.

[0152] The obtained primary columnar activated carbon is impregnated with a certain amount of activating agent (dipotassium hydrogen phosphate or potassium dihydrogen phosphate) – the amount of water equivalent to the saturated water absorption rate of the activated carbon. The mixture is then filtered, dried under a nitrogen atmosphere, and activated again under a nitrogen atmosphere. Subsequently, it is cooled under a nitrogen atmosphere to obtain columnar activated activated carbon (activation regulates the pore structure, enhancing pore volume and specific surface area; the specific surface area is measured using the BET method, but due to the large specific surface area of ​​activated carbon, the measuring instruments are generally inaccurate, typically above 800). The overall yield is ≥90%.

[0153] (3) Secondary hole expansion.

[0154] The obtained columnar activated carbon was subjected to secondary pore expansion by steam distillation at a steam pressure of 0.5–1 MPa (steam temperature ≥150℃). It was then dried under a nitrogen atmosphere to obtain the final product. The overall yield was ≥90%.

[0155] Chemical modification of activated carbon-based support - performance indicators after secondary pore expansion:

[0156] Iodine value ≥900 mg / g, carbon tetrachloride adsorption value ≥800 mg / g, bulk density 0.4~0.5 g / cm³ 3 Specific surface area ≥900m² 2 / g, pore size 5nm, water absorption rate ~70%.

[0157] Activated carbon is produced through three steps: kneading and molding, chemical modification, and secondary pore expansion, followed by final product testing. The entire process involves no loss of activated carbon material; the main losses are water loss and mechanical damage. Furthermore, most additives are burned off during high-temperature calcination.

[0158] See Figure 3 , Figure 3This is a simplified structural diagram of the peracetic acid tail gas adsorber provided by the present invention. The peracetic acid tail gas adsorber 2 comprises an outer shell 11, an outer shell cover plate 12, a support plate 9, a filter wire mesh 7, an O-ring seal 10, and peracetic acid adsorbent 6. It is generally cylindrical and hollow. The key feature is that the O-ring seal 10 is installed at the bottom of the threaded opening at one end of the outer shell plate 11. The support plate 9 and the filter wire mesh 7 are installed inside the outer shell plate 11 in sequence using adhesive. Next, the peracetic acid adsorbent 6 is tightly filled into the outer shell plate 11, with a filling volume of 4 liters at a time. After filling, the filter wire mesh 7 and the support plate 9 are then installed in sequence using adhesive. Adhesive is applied to the upper part of the peracetic acid adsorbent 6. Finally, the outer shell cover 12 is installed on the upper end of the outer shell 11. The outer shell cover 12 has a hollow design, which facilitates the discharge of peracetic acid tail gas from the top of the outer shell cover 12 after catalytic absorption by the adsorbent 6. The peracetic acid tail gas adsorber 2 is designed for a lifespan of 800 cycles. During use, the threaded hole at the bottom of the adsorber 2 is directly tightened onto the tail gas treatment device housing 17. Because an O-ring 10 is designed at the bottom of the threaded opening, the O-ring 10 deforms under pressure to create a seal, which can effectively prevent peracetic acid tail gas from leaking from the threaded opening. After the adsorber 2 reaches its design lifespan, it can be directly treated as medical waste, posing no harm or impact to the environment or medical personnel.

[0159] See Figure 4 , Figure 4 This is a simplified structural diagram of the peracetic acid tail gas treatment device provided by the present invention. The peracetic acid tail gas treatment device 1 consists of a peracetic acid tail gas treatment device housing 17, peracetic acid tail gas adsorbers 2, an air inlet 4, an exhaust port 5, and a manual ball valve 8. The four peracetic acid tail gas adsorbers 2 are directly screwed onto the tail gas treatment device housing 17. The peracetic acid tail gas is connected to the air inlet 4 and, after being dispersed through the internal channels of the housing 17, evenly enters the four peracetic acid tail gas adsorbers 2. The peracetic acid and acetic acid in the peracetic acid tail gas react with the adsorbent 6 to generate some acetate and water. Most of the water is absorbed by the wood-based activated carbon, and only a very small amount of water accumulates back inside the peracetic acid tail gas treatment housing 17 under gravity. Therefore, the manual ball valve 8 needs to be opened and closed periodically to discharge the generated water impurities. The carbon dioxide and other gases generated after the reaction are discharged from the adsorbers 2 through the exhaust port 3. In the peracetic acid adsorbent 11, potassium bicarbonate and sodium bicarbonate can be partially decomposed during the preparation process to produce oxides, which can promote the decomposition of hydrogen peroxide and neutralize peracetic acid and acetic acid, further enhancing the overall adsorption and acid treatment capabilities of the adsorbent.

[0160] See Figure 5 , Figure 5This is a simplified structural diagram of the peracetic acid sterilizer exhaust gas treatment device provided by the present invention. In this device, the peracetic acid sterilizer 15 uses 12-15 mL of sterilizing agent per sterilization cycle, added and discharged in two separate steps. The peracetic acid gas is discharged using a vacuum pump 14 via displacement, with a gas emission rate of 16 m / s². 3 / h, the exhaust gas of peracetic acid first passes through the oil filter 13 to filter the vacuum pump oil in the exhaust gas, and then enters the exhaust gas treatment device 1 through the bellows and the air inlet 4. Since the exhaust gas emission rate of peracetic acid is large, a single exhaust gas adsorber 2 cannot completely adsorb and treat the peracetic acid exhaust gas. After being dispersed through the internal channel of the shell 17, the exhaust gas enters the four peracetic acid exhaust gas adsorbers 2 evenly. The adsorbent 6 first catalytically decomposes the peracetic acid and hydrogen peroxide in the peracetic acid exhaust gas to generate acetic acid, oxygen and water. Then, the acetic acid in the exhaust gas is chemically neutralized to generate some acetate, water and carbon dioxide. The water is discharged through the manual ball valve 8 and the drain port 5, and the carbon dioxide and other gases are discharged outside the peracetic acid sterilizer 15 through the exhaust port 3.

[0161] In the above-described invention Figures 3-5 In this diagram, 1 is the peracetic acid tail gas treatment device, 2 is the peracetic acid tail gas adsorber, 3 is the exhaust port, 4 is the air inlet, 5 is the discharge port, 6 is the peracetic acid adsorbent, 7 is the filter wire mesh, 8 is the manual ball valve, 9 is the support plate, 10 is the O-ring seal, 11 is the outer shell, and 12 is the outer shell cover. 13 is the oil filter, 14 is the vacuum pump, 15 is the peracetic acid sterilizer, 16 is the sterilizer tail gas inlet, and 17 is the peracetic acid tail gas treatment device housing.

[0162] The present invention provides a peracetic acid tail gas treatment device and its preparation method, comprising a peracetic acid tail gas treatment device and a peracetic acid adsorber. The peracetic acid adsorber is filled with a peracetic acid adsorbent, which uses wood-based activated carbon as the adsorption carrier and potassium carbonate, potassium bicarbonate, sodium carbonate, and sodium bicarbonate as the main chemical components. Through a specific processing technology, it can fully catalytically adsorb peracetic acid, hydrogen peroxide, acetic acid, and water in the peracetic acid tail gas. After treatment, the peracetic acid concentration is far below the national emission standard and can be directly discharged. The tail gas treatment device is an integrated structure, fixed to a peracetic acid sterilizer. Four peracetic acid adsorbers are fixed to the tail gas treatment device via threaded connections. After filtration and adsorption by four peracetic acid filters, the compliant tail gas is directly discharged into the environment. After failure, the peracetic acid tail gas adsorbers can be directly removed from the tail gas treatment device without any pollution or impact on the environment.

[0163] The present invention provides a peracetic acid tail gas treatment device and a peracetic acid tail gas treatment process. The peracetic acid tail gas treatment device and corresponding treatment process provided by the present invention can effectively remove and adsorb peracetic acid, hydrogen peroxide, and acetic acid in the tail gas generated by the peracetic acid sterilizer. The concentrations of peracetic acid, hydrogen peroxide, and acetic acid in the environment are less than the specified values, meeting the standards for direct emission. It has the advantages of high tail gas adsorption and decomposition efficiency, convenient installation and replacement, and no pollution, greatly improving the utilization efficiency and sterilization efficiency of the peracetic acid sterilizer.

[0164] To further illustrate the present invention, the following describes in detail a peracetic acid tail gas treatment device and a peracetic acid tail gas treatment method provided by the present invention with reference to embodiments. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. They are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0165] Example

[0166] The manufacturing process of peracetic acid adsorbent is as follows:

[0167] (1) Potassium carbonate (analytical grade, CAS No.: 584-08-7, Sinopharm Group), potassium bicarbonate (analytical grade, CAS No.: 298-14-6, Sinopharm Group), sodium carbonate (analytical grade, CAS No.: 497-19-8, Sinopharm Group), and sodium bicarbonate (analytical grade, CAS No.: 144-55-8, Sinopharm Group) were mixed in a ratio of potassium carbonate:potassium bicarbonate:sodium carbonate:sodium bicarbonate of 4:4:1:1. An aqueous solution of a certain concentration was prepared based on the optimal loading of 30% and the amount of columnar activated carbon (prepared according to the equivalent water volume of the activated carbon's saturated water absorption rate). The solution was saturated and aged for 3 hours, then filtered and dried.

[0168] (2) The carbon dioxide and bicarbonate were calcined at 270-300℃ for 3 hours under a nitrogen atmosphere (heating rate 2℃ / min). During the calcination process, the carbonate and bicarbonate partially decomposed to form a metal oxide-basic carbonate-basic bicarbonate composite multifunctional green and efficient adsorbent, and the target product was obtained---activated carbon-based composite multifunctional green and efficient adsorbent (peracetic acid adsorbent).

[0169] After the peracetic acid adsorbent was prepared, it was tested using a pH method. 1g of activated carbon-based composite multifunctional green high-efficiency adsorbent was ultrasonically impregnated with 5g of double-distilled water, and the pH value was measured to be ~9; the hardness was ≥30 N / cm. 2 The abrasion index is ≤5%. Activated carbon-based composite multifunctional green and efficient adsorbents need to be sealed and stored away from light, heat, and chemicals.

[0170] The preparation steps for highly active activated carbon-based supports are as follows:

[0171] (1) Mixing and kneading to form.

[0172] Take 1 kg of activated carbon, 5% / 0.05 kg of binder (3% / 0.03 kg sodium carboxymethyl cellulose, chemically pure, CAS No.: 9004-32-4, Maclean's; 2% / 0.02 kg polyvinyl alcohol, chemically pure, CAS No.: 9002-89-5, Maclean's), water equivalent to the saturated water absorption rate of the activated carbon (0.65 kg, double-distilled water, conductivity not yet tested), and 5% functional additive (potassium carbonate, analytical grade, CAS No.: 584-08-7, Sinopharm Group). Mix and age at room temperature for 3 hours. Extrude and dry at 450℃ under nitrogen atmosphere (heating rate 2℃ / min). Cut into segments to obtain primary columnar activated carbon (single-screw / twin-screw catalyst extrusion equipment can be used, extrusion requirements are: diameter...). (Operate according to the catalytic extrusion procedure). Overall yield ≥90%.

[0173] (2) Chemical activation.

[0174] The obtained 1 kg of primary columnar activated carbon was mixed with a certain amount of activating agent (10% / 0.1 kg dipotassium hydrogen phosphate K2HPO4, analytical grade, Sinopharm Group, CAS: 7758-11-4, or potassium dihydrogen phosphate (KH2PO4, analytical grade, Sinopharm Group, CAS No.: 7778-77-0) - the equivalent amount of water (0.65 kg, double-distilled water) of the activated carbon's saturated water absorption rate. The mixture was soaked at 70℃ for 5 h, filtered, dried under a nitrogen atmosphere, and then activated at 700–800℃ under a nitrogen atmosphere for 3 h (heating rate 2℃ / min). Subsequently, it was cooled under a nitrogen atmosphere to obtain columnar activated activated carbon (activation regulates pore structure, enhances pore volume and specific surface area; the specific surface area is detected by the BET method, but due to the large specific surface area of ​​activated carbon, detection instruments are generally inaccurate, typically above 800). The overall yield was ≥90%.

[0175] (3) Secondary hole expansion.

[0176] The obtained columnar activated carbon was subjected to secondary pore-expansion by steam distillation for 3 hours at a steam pressure of 0.5–1 MPa (steam temperature ≥150℃). It was then dried under a nitrogen atmosphere to obtain the final product. The overall yield was ≥90%.

[0177] Chemical modification of activated carbon-based support - performance indicators after secondary pore expansion:

[0178] Iodine value ≥900 mg / g, carbon tetrachloride adsorption value ≥800 mg / g, bulk density 0.4~0.5, specific surface area ≥900 m²2 / g, pore size 5nm, water absorption rate ~70%.

[0179] The peracetic acid tail gas treatment device used is as follows: Figures 3-5 As shown.

[0180] To verify the actual effect of the peracetic acid tail gas treatment device, four peracetic acid tail gas adsorbers 2 were tightened onto the tail gas treatment device housing 17. At the same time, the tail gas treatment device 1 was installed onto the peracetic acid sterilizer 15. The outlet of the oil filter 13 and the air inlet 4 of the tail gas treatment device were connected by a corrugated pipe. The peracetic acid sterilizer 15, which uses direct discharge method and activated carbon filtration method for tail gas treatment, was used as a control group. When the peracetic acid sterilizer 15 was running for 100, 300, 600 and 800 cycles, the peracetic acid concentration at the exhaust port 3 of the tail gas treatment device and after sterilization was completed was measured by a peracetic acid gas detector and statistically compared.

[0181] See Table 1, which compares the exhaust gas treatment data of the peracetic acid exhaust gas treatment device provided by the present invention with those of the control group.

[0182] Table 1

[0183]

[0184] By measuring the concentration of peracetic acid at exhaust port 3 of the exhaust gas treatment device during vacuuming of the peracetic acid sterilizer 15 at 100, 300, 600, and 800 cycles using a peracetic acid gas detector, and the concentration of peracetic acid in the sterilization room after sterilization, it was found that when the peracetic acid exhaust gas adsorbent method was used, the concentration at exhaust port 3 was 0.004 ppm and the room concentration was 0.002 ppm at 800 cycles, both lower than the national standard of 0.02 ppm. The room also showed no pungent, acidic odor of peracetic acid, thus achieving the desired effect. The emission standards are as follows: When using the activated carbon method, after 800 boiler cycles, the concentration at the exhaust port 3 of the tail gas treatment device is 1.614 ppm, and the concentration in the room is 1.273 ppm, which is 0.02 ppm higher than the national standard. The room has a noticeable pungent odor of peracetic acid, and the tail gas does not meet the direct emission standard. When using the direct emission method, after 800 boiler cycles, the concentration at the exhaust port of the tail gas treatment device is 24.564 ppm, and the concentration in the room is 20.776 ppm, which is 0.02 ppm higher than the national standard. The tail gas also cannot be directly emitted.

[0185] Therefore, the above experiments clearly demonstrate that the peracetic acid tail gas adsorbent method is far more effective than the direct emission method and the activated carbon method in treating peracetic acid tail gas, and has a stronger treatment capacity.

[0186] The above provides a detailed description of the peracetic acid tail gas treatment device and process provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention, including the best mode, and also to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the textual description of the claims, or if they include equivalent structural elements that are not substantially different from the textual description of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A peracetic acid tail gas treatment device, characterized in that, Includes the housing of the peracetic acid tail gas treatment device, the peracetic acid tail gas adsorber, the air inlet and the outlet; The peracetic acid adsorption device includes one or more peracetic acid adsorbers; The peracetic acid adsorber is equipped with a peracetic acid adsorbent. The peracetic acid adsorbent is an activated carbon-based basic carbonate-basic bicarbonate composite adsorbent. The air inlet is located at the bottom of the housing of the peracetic acid tail gas treatment device; The peracetic acid tail gas treatment device has a gas passage inside its housing. The inlet at the bottom of the peracetic acid tail gas adsorber is detachably fixed to the housing of the peracetic acid tail gas treatment device and is connected to the gas channel inside the housing. The top of the peracetic acid tail gas adsorber is provided with an outlet. The discharge port is located at the bottom of the housing of the peracetic acid tail gas treatment device; The activated carbon-based basic carbonate-basic bicarbonate composite adsorbent includes an activated carbon support and basic carbonates and basic bicarbonates loaded on the activated carbon support. The activated carbon carrier is obtained by kneading, activating, and expanding the pores of activated carbon.

2. The peracetic acid tail gas treatment device according to claim 1, characterized in that, The peracetic acid adsorber includes an outer shell, an outer shell cover plate, a support plate, a filter screen, and a peracetic acid adsorbent; The peracetic acid adsorber is specifically a hollow columnar peracetic acid adsorber; The peracetic acid adsorber is provided with a support plate, a filter screen, peracetic acid adsorbent, a filter screen, and a support plate arranged from bottom to top. The peracetic acid adsorber is provided with an outer shell cover plate with a hollow structure at the top. The peracetic acid tail gas treatment device is an integrated peracetic acid tail gas treatment device.

3. The peracetic acid tail gas treatment device according to claim 1, characterized in that, The particle size of the activated carbon carrier is 2.8~3.2 mm; The activated carbon carrier has a pore size of 5.0~5.5 nm; The specific surface area of ​​the activated carbon carrier is 900~920 m². 2 / g; The iodine value of the activated carbon carrier is ≥900 mg / g.

4. The peracetic acid tail gas treatment device according to claim 1, characterized in that, The basic carbonates include sodium carbonate and / or potassium carbonate; The basic bicarbonate includes potassium bicarbonate and / or sodium bicarbonate. The mass ratio of the basic carbonate to the basic bicarbonate is 1:

1.

5. The peracetic acid tail gas treatment device according to claim 1, characterized in that, The activated carbon carrier is also loaded with alkali metal oxides. The alkali metal oxides include sodium oxide and / or potassium oxide; The hardness of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent is 30~31 N / cm. 2 ; The wear index of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent is 4.8%~5%.

6. The peracetic acid tail gas treatment device according to claim 1, characterized in that, The air inlet of the peracetic acid tail gas treatment device is used to connect to the tail gas of the peracetic acid sterilizer. The peracetic acid tail gas treatment device also includes a conveying device and / or an oil filter; The air inlet of the peracetic acid tail gas treatment device is connected to the tail gas of the peracetic acid sterilizer via a conveying device. An oil filter is installed between the air inlet of the peracetic acid tail gas treatment device and the conveying device.

7. A method for treating peracetic acid tail gas using the peracetic acid tail gas treatment device according to any one of claims 1 to 6, characterized in that, Includes the following steps: The peracetic acid tail gas is transported to the treatment device, and after being treated by the peracetic acid adsorbent, the treated gas is obtained. The peracetic acid adsorbent is an activated carbon-based basic carbonate-basic bicarbonate composite adsorbent.

8. The processing method according to claim 7, characterized in that, The activated carbon-based basic carbonate-basic bicarbonate composite adsorbent includes an activated carbon support and basic carbonates and basic bicarbonates loaded on the activated carbon support. The preparation process of the activated carbon carrier includes the following steps: 1) After mixing activated carbon, binder, functional additives and water and aging, the mixture is extruded and dried to obtain primary activated carbon. 2) After mixing the primary activated carbon, activator and water obtained in the above steps again, the mixture is activated at high temperature under a protective atmosphere to obtain activated primary activated carbon. 3) The activated primary activated carbon obtained in the above steps is subjected to steam distillation for secondary pore expansion to obtain an activated carbon carrier; The adhesive includes sodium carboxymethyl cellulose and / or polyvinyl alcohol; The functional additives include potassium carbonate; The aging time is 3.0~3.2 hours; The drying and molding temperature is 450~455℃; The activator includes dipotassium hydrogen phosphate and / or potassium dihydrogen phosphate; The high-temperature activation temperature is 700~800℃; The steam pressure of the water vapor is 0.5~1MPa; The secondary reaming time is 3.0~3.2h.

9. The processing method according to claim 8, characterized in that, The preparation process of the activated carbon-based basic carbonate-basic bicarbonate composite adsorbent includes the following steps: (1) After mixing basic carbonate, basic bicarbonate, activated carbon carrier and water, the mixture is aged and then calcined under a protective atmosphere to obtain activated carbon-based basic carbonate-basic bicarbonate composite adsorbent. The aging time is 3.0~3.2 hours; The total loading of the basic carbonate and basic bicarbonate is 29.8 wt% to 31.2 wt%. The roasting temperature is 270~300℃; The roasting time is 3.0~3.3h; During the preparation process, some basic carbonates and / or basic bicarbonates decompose to form alkali metal oxides.

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