357 results about "Xylene" patented technology

The invention discloses a p-methyl benzyl chloride production process and a production system thereof, p-xylene side chains and chlorine are subjected to a gas phase substitution reaction under micro negative pressure and visible light catalysis to generate crude methyl benzyl chloride and hydrogen chloride, and 99.0% methyl benzyl chloride, a small amount of benzyl dichloride and 31% hydrochloric acid are respectively generated through rectification and absorption; the device consists of four working sections of chlorination, rectification, hydrochloric acid absorption and distillation. According to the method, the defects in the prior art are overcome, on one hand, chlorine is introduced, and an aromatic ring chlorination reaction is carried out under visible light catalysis; on one hand, a supported catalyst filler is arranged at the bottom of a chlorination tower, and a zeolite molecular sieve modified by long-chain alkylsilane and supported by metal salt is used as a catalyst to catalyze chloromethylation reaction, on the other hand, the hydrophobicity of the modified catalyst is obviously enhanced, and meanwhile, the density of acidic sites is not reduced; the contact opportunity of the catalyst and a reaction substrate is greatly increased, and the catalytic efficiency of the catalyst is improved.

The invention provides a crystalline supramolecular polymer based on snap ring aromatic hydrocarbon. The polymer is obtained by self-assembling snap ring aromatic hydrocarbon (CLP) and a naphthalimide derivative (NDI-8) through a subject and an object. The crystalline supramolecular polymer (NDI-8 (at) CLPalpha) can fully utilize the synergistic effect of a plurality of weak interactions, so that the charge transfer interaction between molecules can be remarkably enhanced very easily. The crystalline supramolecular polymer constructed based on charge transfer shows excellent gasochromic performance. The p-xylene in the NDI-8-coated CLPalpha p-xylene isomer has efficient identification and detection capability, the color is changed from purple to light pink, and a wide application prospect is provided for the development of stimuli-responsive materials.

The invention discloses a platinum-tungsten bimetallic catalyst for PET depolymerization and a method for directional depolymerization of PET by the platinum-tungsten bimetallic catalyst, and belongs to the technical field of solid waste recycling, the platinum-tungsten bimetallic catalyst for PET depolymerization is prepared by a deposition-precipitation method, a mesoporous molecular sieve MCM-48 is used as a carrier to load platinum-tungsten bimetallic, the molar ratio of platinum to tungsten is 1: (0.5-2), the molecular sieve MCM-48 is a mesoporous molecular sieve MCM-48, and the mesoporous molecular sieve MCM-48 is a mesoporous molecular sieve MCM-48 carrier. And the platinum loading capacity is 4-6 wt%. By utilizing the platinum-tungsten bimetallic catalyst, one-pot depolymerization of PET can be realized to prepare p-toluic acid and p-xylene, the platinum-tungsten bimetallic catalyst can be used for multiple times through reduction regeneration, the catalytic activity is high, and the PET depolymerization method under catalysis of the platinum-tungsten bimetallic catalyst is suitable for recycling and upgrading of PET wastes in various forms and has wide application prospects. The technical problems of efficient depolymerization and directional conversion of the waste PET are solved, and a sustainable technical path is provided for resource recycling of the PET.

The invention discloses a molecular sieve-based microsphere fluidized bed catalyst as well as a preparation method and application thereof. The catalyst comprises a transition metal modified molecular sieve, the molecular sieve is selected from at least one of ZSM-5, ZSM-11, ZSM-12, Silicate-I (at) ZSM-5, Silicate-I (at) Y, Silicate-I or Silicate-II type molecular sieves, the Si / Al molar ratio of the outer surface of the transition metal modified molecular sieve is larger than 250, and the Si / Al molar ratio of a body is 30-250; the transition metal is selected from at least one of Mn, Cu, Co or Ni. The catalyst disclosed by the invention is used in a reaction for preparing p-xylene through shape-selective methylation of aromatic hydrocarbon, so that the abrasion of the catalyst is remarkably reduced, and the conversion rate of toluene and the selectivity of p-xylene are improved.

The invention discloses a two-phase absorbent for capturing CO2, which is characterized by being prepared from the following components in percentage by mass: 25%-30% of N-(2-ethoxyl) ethylenediamine, 0%-3% of N-aminoethyl piperazine, 0%-3% of 2-(1-ethoxyl) pyridine, 10%-13% of N, N '-diethyl ethylenediamine, 15%-20% of N, N'-diethylethylenediamine, 5%-10% of N, N '-diethylethylenediamine, 5%-10% of N, N'-diethylethylenediamine and the balance of water. The invention relates to a cleaning agent which is prepared from the following components in percentage by weight: 1 to 5 percent of N, N-diethylhydroxylamine, 1 to 5 percent of pentamethyldiethylenetriamine, 0 to 2 percent of tert-butylamine ethoxyethanol, 0 to 3 percent of 2-amino-2-methyl-propyl alcohol, 5 to 8 percent of sulfolane, 5 to 8 percent of dimethyl ether, 5 to 8 percent of p-xylene and 5 to 8 percent of n-butyl alcohol. The composition can be prepared by uniformly stirring the components. The preparation method is simple, and the prepared two-phase absorbent can improve the saturated absorption capacity, improve the desorption rate and optimize the performance of the phase change absorbent.

[Problem] To provide a method capable of producing a monocyclic aromatic hydrocarbon such as benzene or xylene effective as a base raw material, with a naphtha raw material containing renewable naphtha. [Solution] A method for producing at least one monocyclic aromatic hydrocarbon of benzene or xylene with a naphtha raw material containing renewable naphtha, the method including step (A-1) of pyrolyzing the naphtha raw material in the presence of water vapor, to produce and separate toluene, and step (A-2) of subjecting toluene to disproportionation reaction or transalkylation reaction, to produce and separate at least one monocyclic aromatic hydrocarbon of benzene or xylene.

The invention relates to an adsorbent based on an X molecular sieve and preparation and application thereof, and a preparation method of the adsorbent comprises the following steps: (1) mixing the X molecular sieve with a binder, molding and roasting to obtain a molded body; (2) treating the molded body obtained in the step (1) with an alkali solution to perform in-situ crystallization on the binder in the molded body to obtain a crystallized product; (3) carrying out partial barium ion exchange on the crystallized product obtained in the step (2) by using a barium salt solution, and drying to obtain a dried product; (4) carrying out ammonium ion exchange on the dried product obtained in the step (3) by using an ammonium salt solution, and roasting in a flowing atmosphere to obtain a roasted product; and (5) performing barium ion exchange and optional potassium ion exchange on the roasted product obtained in the step (4), and then drying to obtain the adsorbent. The adsorbent has at least two kinds of mesoporous channels with different apertures, has high barium ion exchange capacity, high adsorption capacity and compressive strength, and shows good adsorption selectivity and mass transfer performance when used for adsorption separation of p-xylene.

The invention belongs to the technical field of synthesis of organic compounds, and particularly relates to a benzocrown ether derivative and a synthesis method thereof. According to the invention, carboxylic acid or substituted carboxylic acid as shown in a general formula I, benzocrown ether as shown in a general formula II and substituted terephthalaldehyde as shown in a general formula IV are used as raw materials, and two kinds of benzocrown ether derivatives as shown in a general formula (A) and a general formula (B) are synthesized through Friedel-Crafts acylation reaction, reduction reaction and substitution reaction. The preparation method provided by the invention has the advantages of simple and easily available raw materials, simple post-treatment, high yield, good universality, environmental friendliness and the like. The two benzocrown ether derivatives as shown in the general formula (A) and the general formula (B), which are disclosed by the invention, serve as important organic synthesis intermediates and have great research values in the aspects of ion recognition, material preparation, medicine synthesis and the like.

The utility model discloses a phthalic anhydride preparation device with a preheater, which comprises an o-xylene storage tank, an o-xylene heater, a mixer, an oxidation reactor, a first phthalic anhydride catcher, a second phthalic anhydride catcher, a tail gas tower and a phthalic anhydride rectifying tower which are sequentially connected through a pipeline, a liquid adding pump is arranged between the o-xylene storage tank and the o-xylene heater; the phthalic anhydride preparation device with the preheater further comprises an air compressor and an air heater which are sequentially connected through a pipeline, the air heater is connected with the mixer through a pipeline, and the air preheater is further arranged between the air compressor and the air heater and comprises a body. A heating pipe fitting is arranged in the body, the heating pipe fitting comprises a heating pipe and spiral fins arranged around the heating pipe, by-product low-pressure steam of the oxidation reactor can be reasonably utilized by additionally arranging the air preheater, and the use amount of high-pressure steam is saved.

The invention provides a preparation method of a low-sulfur diesel oil anti-wear agent, and belongs to the technical field of carbon-containing fuel processing, and the preparation method comprises the following steps: adding sodium oleate, tetrabutylammonium bromide and xylene into a three-necked flask, uniformly stirring and mixing, heating, dropwise adding 3-chloro-1, 2-propylene glycol, continuously heating until reflux, centrifuging, and carrying out rotary evaporation to obtain glyceryl monooleate; the preparation method comprises the following steps: dispersing NCC in xylene, adding lauric acid and p-toluenesulfonic acid, and carrying out heating, reflux reaction, cooling, centrifugation, washing and drying under the protection of an inert atmosphere to obtain modified NCC; the preparation method comprises the following steps: heating and melting glyceryl monooleate, adding silane modified silicon dioxide, stirring, carrying out ultrasonic treatment, cooling to obtain a modified nano-composite, adding the modified NCC and a stabilizer, stirring, and carrying out ultrasonic uniform mixing to obtain the low-sulfur diesel oil anti-wear agent. The diesel oil anti-wear agent provided by the invention can improve the wear resistance of diesel oil under the condition that the addition amount is relatively low, and improve the low-temperature fluidity and demulsifying performance.

The present invention relates to a process for the preparation of a compound of formula (I), a stereoisomer, a salt, a hydrate or a solvate thereof, (II) comprising the step of sulfinylation of a compound of formula (IV) to produce compound of formula (II); (IV) wherein: R1 and R2 are as defined in the claims, wherein said sulfinylation step is performed in the presence of a solvent selected from the group comprising benzene, toluene, ethylbenzene, xylene, chlorobenzene, bromobenzene, fluorobenzene, anisole, nitrobenzene, tetralin, dichlorobenzene, trimethylbenzene, ethylacetate, propylacetate, butylacetate, propanol, butanol, 2- methyltetrahydrofuran, diethylether, methyltertbutylether, cyclopentyl methyl ether, dichloromethane, tetrachloromethane, pentane, hexane, heptane, cyclohexane, decaline and mixtures thereof.

The invention relates to an anti-allergic soothing cosmetic and a preparation method thereof. The invention discloses an N-Ala-Phe-Cys-C aqueous solution or an external cosmetic containing N-Ala-Phe-Cys-C for the first time, wherein the N-Ala-Phe-Cys-C aqueous solution or the external cosmetic has anti-allergic soothing effects. The eye cream has excellent single-time and multi-time skin external application safety, and is free of irritation to eyes. Compared with a blank control group, the cosmetics prepared from the 0.01-10% N-Ala-Phe-Cys-C aqueous solution and the formulas 1-4 of the embodiments 5-7 have a remarkable itching relieving effect, and have an inhibiting effect on allergic itching caused by histamine phosphate. Compared with a blank control group, the 0.05%-10% N-Ala-Phe-Cys-C aqueous solution and various formula cosmetics in embodiments 5-7 have a remarkable inhibition effect on auricle swelling caused by xylene.

The invention relates to a high-resistance anti-corona paint and a preparation method and an insulating structure thereof, wherein the high-resistance anti-corona paint comprises water-based epoxy emulsion, silicon carbide, water-based epoxy curing agent and silicon dioxide. The mass ratio of water-based epoxy emulsion, silicon carbide, water-based epoxy curing agent and fumed silicon dioxide is 100: (150-200): (100-150): (0.1-2). The high-resistance anti-corona paint of the invention adopts a water-based resin system, has a low volatile organic matter content and does not contain volatile organic matter such as xylene or toluene, is more green and environmentally friendly, and the anti-corona coating wire rod or coil formed by the paint does not cause ablation, breakdown or flashover at a higher voltage (80kV), has good voltage resistance, is suitable for anti-corona treatment of hydropower and nuclear power generators of 20kV and above, and has broad application prospects.

A system includes an outlet flowline from an activated carbon bed, a bypass flowline, a furnace, and a control system. The outlet flowline is configured to flow an acid gas stream out of the activated carbon bed after the activated carbon bed has removed benzene, toluene, and xylene from the acid gas stream. The bypass flowline includes a bypass valve and provides an alternative flow path for the acid gas stream exiting the activated carbon bed. The furnace includes a burner configured to combust at least a portion of the acid gas stream. The control system includes a temperature sensor and a controller. The temperature sensor is configured to measure a furnace temperature. The controller is configured to reduce a percent opening of the bypass valve based on the measured furnace temperature.

The present invention relates to a method for surface modification of a MCM-22 molecular sieve shape-selective catalyst, belonging to the technical field of chemical engineering catalysis. In this preparation method, a macromolecular organic acid is selected to selectively remove the Al sites on the outer surface of the MCM-22 molecular sieve, and then a macromolecular silyl group is grafted onto the hydroxyl defect sites generated on the outer surface of the molecular sieve due to dealumination. This method can avoid blocking the pores of MCM-22, eliminate the outer surface acidity while retaining the internal activity of the molecular sieve, and reduce the pore mouth size, thereby obtaining a MCM-22 molecular sieve shape-selective catalyst with high activity, high selectivity and high stability. When this catalyst is applied to the reaction of alkylation of toluene with dimethyl carbonate to synthesize p-xylene, the activity of the catalyst remains 36% within 20 hours, and the selectivity can reach up to 66% at most.

Catalyst compositions containing a pyrrole compound, a chromium compound, an organoaluminum compound, and an aromatic hydrocarbon solvent comprising xylenes or C9 substituted benzenes are disclosed. Related ethylene oligomerization processes utilizing the catalyst compositions to produce oligomer products containing 1-hexene also are described.

Catalyst compositions containing a pyrrole compound, a chromium compound, an organoaluminum compound, and an aromatic hydrocarbon solvent comprising xylenes or C9 substituted benzenes are disclosed. Related ethylene oligomerization processes utilizing the catalyst compositions to produce oligomer products containing 1-hexene also are described.

The invention relates to an isoindole thioimine compound, preparation thereof and application of the isoindole thioimine compound as a sigma-2 receptor inhibitor. Catechol and isobutene are subjected to a series of reactions under certain conditions to obtain a solid product; carrying out a series of reactions on o-xylene and chlorosulfonic acid under certain conditions to obtain an oily product; and reacting the solid product with the oily product under a certain condition to obtain the isoindole thioimine compound. Compared with the prior art, when the isoindole thioimine compound prepared by the invention is combined with a sigma-2 receptor and allosteric regulates a sigma-2 receptor compound, the combination of adjacent A beta oligomers and a receptor on synapse is unstable, so that the A beta oligomers are removed from the synapse, the activity of the sigma-2 receptor can be effectively inhibited, and the activity of the sigma-2 receptor can be inhibited. The compound can be further used for preparing new medicines for treating tumors and neurodegenerative diseases.

The application discloses a synthesis method of 2,3,3',4'-biphenyl tetracarboxylic dianhydride, characterized in that 2,3-dimethylaniline is used as a starting raw material, 2,3-dimethylaniline diazonium salt is prepared through a diazotization reaction, then 2,3,3',4'-tetramethyl biphenyl is prepared through a coupling reaction of the 2,3-dimethylaniline diazonium salt and o-xylene under the catalysis of cuprous chloride, and finally 2,3,3',4'-biphenyl tetracarboxylic dianhydride is prepared through an oxidation reaction and dehydration to form anhydride. The coupling reaction in the synthesis method has good selectivity, 3,3,4',4'-tetramethyl biphenyl which is difficult to separate is not generated, high-purity a-BPDA can be finally obtained, and the coupling reaction in the synthesis method only needs to use low-cost cuprous chloride as a catalyst, so that the production cost is greatly reduced compared to a high-cost catalytic system in the prior art, and the synthesis method is more suitable for industrial mass production.

The purpose of the present invention is to provide an industrially preferred method for producing a p-toluenesulfonate of 7-(2,3-difluoro-4-(2-((2-methoxyethyl)(methyl)amino)ethoxy)benzyl)-10-hydroxy-6-methyl-N-(4-methyl-2-(6-methylpyrimidin-4-yl)phenyl)-8-oxo-6,7-diazaspiro[4,5]dec-9-ene-9-carboxamide, which enables a target product to be obtained more inexpensively and easily as compared to conventional methods.The present invention has attained a method which enables a target product to be efficiently obtained by a step of preparing wet powder of a p-toluenesulfonate of 7-(2,3-difluoro-4-(2-((2-methoxyethyl)(methyl)amino)ethoxy)benzyl)-10-hydroxy-6-methyl-N-(4-methyl-2-(6-methylpyrimidin-4-yl)phenyl)-8-oxo-6,7- diazaspiro[4,5]dec-9-ene-9-carboxamide, and a step of drying the wet powder.

The application provides a catalyst and a preparation method and application thereof, and the catalyst comprises a carrier and an active metal component loaded thereon; the carrier comprises ZSM-5 zeolite and a binder, and the molar ratio of SiO2 / Al2O3 in the ZSM-5 zeolite is 15-50; the amount of strong acid centers on the outer surface of the catalyst is less than or equal to 10 mu mol / g; and the ratio of the saturated adsorption amount of p-xylene to the saturated adsorption amount of o-xylene of the catalyst is 3-20 under the condition of 400 DEG C. The catalyst provided by the application can catalyze the generation of benzene from toluene dealkylation under a medium-temperature condition, and the selectivity of benzene is good and the yield is high.

The present invention relates to P2X3 inhibitor compounds and their salts, crystalline polymorphs and uses.The present invention provides the crystalline form of the compound of formula I with good medicinal properties.The present invention also obtains medicinal salts of the compound of formula I, and further obtains crystalline form products of salts, such as hydrochloride crystalline form A, maleate crystalline form A, p-toluenesulfonate crystalline form A, benzenesulfonate crystalline form A, malonate crystalline form A, etc., which has important significance for the development of effective therapeutic drugs.

The application discloses a preparation method of an aluminum shielding tape surface conductive self-repairing coating. First, a clean aluminum shielding tape surface is obtained through an in-situ reduction / etching pretreatment method based on an aluminum salt / fluoride salt compound solution; second, a conductive / self-repairing dual-effect enhancer is prepared and introduced into a conductive / self-repairing coating synthesized by polyether amine, diisocyanate, a multiple active amine compound, p-xylene glycol and aniline; finally, the solid content of the coating is adjusted and sprayed on the clean aluminum shielding tape surface to obtain the conductive self-repairing coating. The application converts the Al2O3 film on the aluminum surface into a new substance Al, simultaneously constructs a regular porous structure, increases the bonding strength of the film layer, improves the adaptability and self-repairing efficiency of the coating in cable manufacturing and subsequent operation through the construction of a coating with multiple dynamic hydrogen bonds and imine bond synergistic effect, and realizes good conductive enhancement effect and rapid thermal self-repairing purpose of the coating by using isocyanate modified carbon nanotubes as the enhancer.

The invention discloses a silicon nitride aerogel compounded high-temperature-resistant rigid heat-insulation tile and a preparation method thereof, and belongs to the technical field of heat-insulation tile preparation, and the method comprises the following steps: adding a dispersing agent into pretreated high-temperature-resistant fibers, uniformly dispersing, carrying out vacuum filtration, drying, uniformly mixing with deionized water, pouring into a mold, and freeze-drying to obtain the high-temperature-resistant rigid heat-insulation tile. Carrying out carbon deposition treatment in carbon source gas to deposit pyrolytic carbon on the surface of the green body to obtain a dry green body of the heat insulation tile; and uniformly mixing polysilazane, ferrocene and xylene to obtain a polysilazane precursor solution, and injecting the polysilazane precursor solution into the heat insulation tile dry blank for heat treatment to obtain the silicon nitride aerogel compounded high-temperature-resistant light rigid heat insulation tile. The material has the advantages of strong mechanics, excellent heat insulation, high temperature resistance, oxidation resistance, balanced comprehensive performance, low density and small porosity, and is suitable for the fields of spaceflight, high-temperature equipment and the like. The strength and nucleation are improved by constructing a multi-stage structure and pyrolytic carbon, a binder-free process is green, aerogel is compounded and insulated, and the process is controllable and easy to scale.

A process for removing a heavy metal, such as mercury (Hg), from thturboe surface of a component used in the oil and gas industry, such as a sampling bottle or piece of equipment, is provided. The process includes applying an organic solvent, which includes iodine, to the surface of the component and then applying an aqueous solution to the surface. The organic solvent can also include toluene, xylene, a mixture thereof, or suitable organic solvents. The aqueous solution can consist of anions that form a soluble complex with the heavy metal, such as thiosulfate (S2O3)2-, iodide (I-), or a thiosulfate salt. According to another embodiment, the aqueous solution includes I2 and I-, and the process further includes applying an acid having a pKa ranging from -14 to 2 to the surface followed by deionized water.

A fluidized bed device for coupling naphtha and methanol to prepare aromatics and co-produce olefins and its application method are provided. By using the device, under the action of a catalyst, naphtha reacts with methanol to generate product gas containing aromatics and light olefins as main components. The method can efficiently and selectively convert linear and branched aliphatic hydrocarbons into aromatics, while also increasing p-xylene production through aromatic methylation reactions, with the p-xylene content in the xylene mixture exceeding 75 wt %. The fluidized bed reactor achieves increased p-xylene production by controlling the progression of cascade reactions (naphtha→benzene / toluene→p-xylene). Additionally, it utilizes the methylation reaction of benzene / toluene with methanol to provide in-situ heat for the coupled naphtha-methanol aromatization process, thereby achieving autothermal balance.

The present application relates to the technical field of petroleum chemical industry, disclose a kind of method for improving the yield of toluene and xylene of reforming product oil, the system for improving the yield of toluene and xylene of reforming product oil.A kind of method for improving the yield of toluene and xylene of reforming product oil, the method comprises: under the alkylation reaction condition, in the presence of alkylation catalyst, C6-C7 fraction in reforming product oil is contacted with benzene and optionally hydrogen gas to carry out alkylation reaction;Wherein, alkylation catalyst includes MFI type zeolite, binder and optionally metal component, optionally metal functional adjuvant component.The method for improving the yield of toluene and xylene of reforming product oil has the advantages that toluene and xylene yield is high, and the effective separation of aromatic hydrocarbon and non-aromatic hydrocarbon under the condition of no extraction can be realized.

The invention discloses an application of p-xylene in prevention and control of straight-spot fly imagoes, and belongs to the technical field of agricultural planting research. Aiming at the problems that the yield of the chenopodium quinoa willd is seriously lost by the chenopodium quinoa willd and the existing prevention and treatment means only depend on chemical agents, the natural component p-xylene of the chenopodium quinoa willd is utilized to remarkably attract adults of the chenopodium quinoa willd, and the chenopodium quinoa willd attractant can be directly used for attracting the adults of the chenopodium quinoa willd and also can be used for preparing the attractant for the the concentration of p-xylene in the attractant is 0.1 mu g / mu L to 100 mu g / mu L. The application is green and environment-friendly, does not need to depend on chemical agents, provides a new way for green prevention and control of the adult straight-spot fly, broadens the prevention and control means of the chenopodium quinoa willd pests, and has important practical application value and scientific significance.

The utility model discloses a refrigerator disassembling and recycling line, belongs to the technical field of refrigerator recycling, and solves the problem that an existing waste refrigerator treatment line does not treat waste gas. The device comprises a pre-disassembling platform used for manually disassembling the refrigerator, a tearing crusher used for tearing and crushing the refrigerator, a vibrating screen used for separating a foam plastic mixture from metal, an eddy current separator used for separating copper and aluminum and copper and aluminum separation equipment which are sequentially connected through a conveying belt, exhaust ports of the tearing crusher, the cyclone separator assembly and the volume reduction machine are all communicated with an air inlet of the waste gas treatment equipment, and activated carbon is arranged in the waste gas treatment equipment. Compared with an existing waste refrigerator treatment line, the waste gas treatment line has the advantages that waste gas can be treated, parts which are easy to generate waste gas and dust are communicated with waste gas treatment equipment, organic waste gas such as Freon, benzene, methylbenzene and dimethylbenzene can be effectively removed by activated carbon of the waste gas treatment equipment, and suspended particulate matters in air are reduced.

This invention relates to the field of terephthalic acid oxidation residue technology, specifically a high-efficiency treatment method for terephthalic acid oxidation residue, comprising the following steps: S1. Pretreatment; S2. Separation; S3. Evaporation and concentration; S4. Incineration; S5. Ash dissolution; S6. Filtration; S7. Sodium carbonate recovery; S8. Sodium carbonate recycling; S9. Bromine recovery and utilization; S10. Cobalt-manganese catalyst recovery; S11. Precipitate treatment; S12. Cobalt-manganese catalyst recycling. This application utilizes the waste heat or residual heat from the top of the xylene oxidation unit as a heat source to heat and concentrate the first filtrate. The acetic acid flash evaporator in the crystallizer serves as the heat source for evaporator V3 to evaporate and concentrate sodium carbonate, reducing process energy consumption and improving sodium carbonate recovery efficiency. The incineration unit heats the furnace body through external and internal incineration components, achieving efficient incineration of the material, greatly increasing the material's heating efficiency, and improving incineration efficiency and energy utilization.