228 results about "Dimethyl ether" patented technology

The invention provides chlorotrifluoroethylene continuously prepared based on a microchannel reactor and a preparation method of the chlorotrifluoroethylene, and the chlorotrifluoroethylene comprises the following raw materials in parts by weight: 1, 1, 2-trifluoro-1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 The low-temperature refrigerant refrigerant is prepared from the following components in parts by weight: 90 to 100 parts of 1, 2-trichloroethane, 1 to 5 parts of a zinc fluoride induced palladium-copper bimetallic catalyst, 8 to 15 parts of a cyclohexyl dimethyl ether-formic acid composite hydrogen donor, 0.5 to 2 parts of trifluoroacetic anhydride, 0.1 to 0.5 part of a perfluoropolyether lubricant, a proper amount of a low-temperature mixed refrigerant and 15 to 20 percent by weight of diluted hydrochloric acid. According to the invention, the preparation efficiency and product purity of chlorotrifluoroethylene can be improved, and stable operation of the preparation system and reasonable treatment of byproducts can be guaranteed.

The invention discloses an internal-acid and external-alkali type organic-inorganic hybrid molecular sieve catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials and chemical processes. According to the catalyst, a hydrogen type Beta molecular sieve is used as an acidic inner core, polyvinylpyrrolidone (PVP) is used as an organic shell, and a unique inner-acid outer-alkali structure is formed. The preparation method comprises the following steps: hydrothermally synthesizing a hydrogen type Beta molecular sieve with a specific silica-alumina ratio, and then coating PVP through surface adsorption. The catalyst is used for catalyzing the condensation of methylal and trioxymethylene under mild conditions (40-70 DEG C and normal pressure) to prepare polyoxymethylene dimethyl ethers (DMMn). The PVP shell covers acidic sites on the outer surface of the molecular sieve to form an external neutral / weak base and internal strong acid microenvironment, so that the secondary side reaction of the product is effectively inhibited, the trioxymethylene conversion rate of more than 98% and the DMMn selectivity of more than 96% can be obtained in the reaction at 50 DEG C and normal pressure, the product distribution can be regulated and controlled, and the traditional Anderson-Schulz-Flory distribution limitation is broken through. The catalyst disclosed by the invention has the advantages of high activity, high selectivity, mild conditions and easiness in separation, and has a good industrial application prospect.

The invention provides an aerosol-type face pack cosmetic that, when dispensed, forms a flexible, easy-to-use, and low-irritation resin foam that easily adheres to the face, such as around the eyes and nose. It also allows the fermented liquid contained in the resin foam to easily seep out, making it easy to apply the fermented liquid to the face and less likely to cause tightness. [Solution] An aerosol pack cosmetic comprising a beauty serum and dimethyl ether, wherein the beauty serum comprises at least one fermentation solution selected from Saccharomyces / Anzange ferment filtrate, Saccharomyces / Human (fibroblast / mononuclear cell) induced pluripotent cell culture conditioned medium ferment filtrate, Galactomyces / Eryngium multiflorum callus culture ferment filtrate, and a resin.

The present invention provides a blowing agent for producing extruded polystyrene foam having low lambda over time and low foam density. [Solution] The foaming agent comprises (a) a first co-foaming agent consisting of (a) about 50% to about 70% by weight of HFO and / or HFCO having three or four carbon atoms, (b) about 2% to about 15% by weight of methyl formate, (c) a second co-foaming agent consisting of about 20% to about 30% by weight of dimethyl ether, isobutane and combinations thereof, and (d) a third co-foaming agent consisting of about 2% to about 25% by weight of carbon dioxide, acetone and combinations thereof.

The present invention provides - a) i) at least one anionic fixing polymer; ii) at least one direct dye, and iii) at least one C2-C4 monoalcohol At least one composition comprising: b) at least one propellant selected from dimethyl ether wherein the composition comprises less than 5% by weight of water, based on the total weight of the composition; and - a means for delivering the composition; The present invention relates to an aerosol device comprising: The present invention also relates to a method for neutralizing the yellow and / or orange hue of previously bleached and / or natural keratin fibers.

The application discloses a kind of micro-reaction devices for extracting algal oil, comprising sequentially arranged solid-liquid microextractor, DME gasification chamber and micro water-oil separation device, solid-liquid microextractor includes upper layer center shaft, the peripheral wall of upper layer center shaft is provided with a plurality of mixing structures, the mixing structure is composed of DME mixing layer, extraction separation membrane and algal liquid layer, upper layer center shaft drives the rotation centrifugation of mixing structure, DME is mixed and reacted with algal liquid to obtain mixture by penetrating extraction separation membrane, the mixture is separated and recovered by DME gasification chamber for DME gasification, and water-oil mixture is separated by micro water-oil separation device, so as to obtain algal oil.The application provides a kind of micro-reaction devices for extracting algal oil, which can fully utilize the characteristics of dimethyl ether to extract algal oil.

This invention relates to the field of organic synthesis technology, specifically to a highly efficient and stable Grignard preparation and its green preparation method. By weight, it comprises 8-18 parts of a magnesium source, 40-92 parts of a halogenated hydrocarbon, 150-200 parts of a green solvent, 15-20 parts of ethylene glycol dimethyl ether, and 2.3-3.2 parts of a synergistic stabilizer. The green solvent is 2-methyltetrahydrofuran, or a composite solvent with a weight ratio of 2-methyltetrahydrofuran:methyl tert-butyl ether of 150-160:40-50. The synergistic stabilizer is composed of 1.5-2.0 parts of N,N,N',N'-tetramethylethylenediamine and 0.8-1.2 parts of butylated hydroxytoluene, or composed of 1.5-2.0 parts of N,N,N',N'-tetramethylethylenediamine and 1.0 part of phenothiazine. This invention uses a green solvent system to replace traditional toxic and harmful solvents, and combines it with a solvent recovery process to achieve solvent recycling, which greatly reduces waste emissions and makes the production process safer and more environmentally friendly, in line with the development direction of green chemical industry.

The invention discloses a catalyst for preparing methyl acetate through carbonylation of dimethyl ether as well as a preparation method and application of the catalyst, and belongs to the technical field of industrial catalysis. A preparation method of a catalyst for preparation of methyl acetate through carbonylation of dimethyl ether comprises the following steps: placing a template agent-containing sodium mordenite molecular sieve in low-temperature plasma, and carrying out modification treatment under a first preset condition to obtain a modified sodium mordenite molecular sieve; performing ammonium ion exchange treatment on the modified sodium-type mordenite molecular sieve to obtain an ammonium-type mordenite molecular sieve; and placing the ammonium type mordenite molecular sieve in low-temperature plasma, and carrying out modification treatment under a second preset condition to obtain the catalyst, wherein the first preset condition comprises that modification treatment is carried out under gradient voltage; the second preset condition comprises modification treatment under a constant voltage. According to the preparation method disclosed by the invention, the acid density, the micropore specific surface area and the micropore volume of the mordenite can be improved, and the mordenite shows higher catalytic activity and stability in a reaction for preparing methyl acetate through dimethyl ether carbonylation.

To provide an aerosol product having sufficient cooling performance without using hydrofluoroolefin as a propellant.SOLUTION: An aerosol product comprising an aerosol composition containing not less than 40vol% of at least one propellant selected from the group consisting of dimethyl ether and liquefied petroleum gas, an aerosol vessel for filling the aerosol composition, the aerosol vessel comprising a pressure vessel and an aerosol valve fixed to the pressure vessel, and a spray member attached to the aerosol valve, wherein the aerosol composition contains substantially no water, the aerosol valve is not formed with a gas phase introduction hole, and the spray member is not provided with a mechanical breakup mechanism, the aerosol valve has a stem hole cross-sectional area / an injection hole cross-sectional area of 5.0 or more.SELECTED DRAWING: Figure 1

A working medium for a heat cycle includes trifluoroethylene, a low boiling point compound having a lower boiling point than the boiling point of the trifluoroethylene, and high boiling point compounds having higher boiling points than the boiling point of the trifluoroethylene. In the working medium, the low boiling point compound is at least one selected from the group consisting of carbon dioxide, R116, and R41, and the high boiling point compounds are at least two selected from the group consisting of HFC-32, HFO-1234yf, HFO-1234ze (E), HFO-1243zf, PFC-14, HFC-134, HFC-143a, HFC-227ea, cyclopropane, isobutene, isobutane, dimethyl ether, and ammonia. An application of the working medium is provided.

The invention discloses a preparation method of dimeticone aerosol, and belongs to the technical field of pharmaceutical preparations. The method comprises the following steps: (a) adding 0.6%-1% by mass of dimeticone and 0.25%-0.58% by mass of menthol into a medicinal aluminum tank or stainless steel tank with the inner wall coated with an inert material, and stirring for 5-30 minutes at 100-500 rpm under the protection of nitrogen to form uniform and transparent liquid; (b) sealing and filling dimethyl ether with the purity not lower than 99.9% at the temperature of 10-20 DEG C to serve as a propellant, and enabling the content of the dimethyl ether to reach 98.42%-99.15%; and (c) valve assembly and sealing are completed under the conditions that the temperature is 15-30 DEG C and the relative humidity is smaller than or equal to 60%, and standing balancing is conducted for 12-48 hours at the temperature of 25 DEG C. According to the dimeticone propellant disclosed by the invention, the problems of poor compatibility of dimeticone and the propellant, instability in long-term storage, easiness in layering or valve blockage and the like are effectively solved by virtue of synergistic measures of limiting the component proportion, adopting high-purity dimethyl ether, controlling the particle size of menthol, using an inert coating container, protecting by nitrogen and the like.

The application relates to the technical field of batteries, in particular to an electrolyte suitable for primary lithium-manganese batteries and a preparation method thereof. The electrolyte comprises propylene carbonate, ethylene carbonate, lithium bisfluorosulfonylimide, lithium perchlorate, lithium bisoxalate borate, terminal bisdifluorophosphorylated oligomeric trimethylene carbonate, ethylene glycol dimethyl ether, lithium difluorooxalate borate and 1,3-propane sultone. The electrolyte is prepared through a pre-coordination and segmented dilution process with specific timing. The electrolyte system can synergistically optimize the electrode interface film forming process, has high discharge capacity retention rate and low direct current resistance at low temperature (-20 DEG C), and has high capacity retention rate after high-temperature storage (60 DEG C), thereby significantly improving the comprehensive performance of the primary lithium-manganese battery in a wide temperature range.

The invention belongs to the technical field of caulking agents, and particularly relates to a polyurethane caulking agent and a preparation method thereof.The polyurethane caulking agent is prepared from, by mass, 35%-40% of siloxane modified dendritic polyether tetrahydric alcohol, 35%-40% of diphenylmethane diisocyanate, 5%-10% of plasticizer chlorinated paraffin, 3%-4% of 2-phenyl-5-trifluoromethyl-1, 3-oxazolidine latent curing agent, 1%-2% of foam stabilizer and 1%-2% of catalyst 2. 0.5-0.8% of 2, 2 '-dimorpholinyl diethyl ether, 5-8% of dimethyl ether and 5-8% of propane and butane. According to the polyurethane joint mixture, the 2-phenyl-5-trifluoromethyl-1, 3-oxazolidine latent curing agent is added, in the curing process, the latent curing agent reacts with water in advance of the diphenylmethane diisocyanate to form an amine substance, amido in the amine substance reacts with the diphenylmethane diisocyanate to generate a macromolecular polymer, curing of the polyurethane joint mixture is achieved, and the polyurethane joint mixture has the advantages that the curing effect is good; the curing time can be shortened, and the construction speed is increased.

The invention provides efficient mild whitening cream and a preparation method thereof. The raw materials of the cream comprise five phases A and E, the phase C contains 0.1-3% of a mixed solution of isosorbide dimethyl ether and hydroxyl pinacolone retinoate, and the phase D contains 0.01-0.1% of L-carnitine. Wherein the hydroxyl pinacolone retinoate can be specifically combined with an RAR / RXR (Region Receptor / Receptor X Receptor), and the expression of an MITF (Microphthalmia-associated Transcription Factor) gene is reduced, so that the melanogenesis is inhibited; l-carnitine promotes fatty acid beta-oxidation and enhances ATP synthesis to indirectly regulate and control AMPK activity; aMPK enhances transcriptional activity of a tretinoin receptor through phosphorylation of the tretinoin receptor, so that the AMPK and hydroxyl pinacolone retinoate exert a synergistic effect, jointly enhance whitening activity, effectively improve the phenomena of color spots and dark skin and promote the skin color to be uniform, bright and white; meanwhile, the isosorbide dimethyl ether can promote the transdermal absorption of the hydroxyl pinacolone retinoate, the L-carnitine and the related active ingredients.

The invention relates to the technical field of lithium ion battery electrolyte, and particularly discloses lithium ion battery low-temperature electrolyte and a preparation method thereof. According to the invention, the low-viscosity halogenated propionate carboxylic ester and the perfluoroalkyl methyl ether solvent are cooperated, so that the freezing point and the system viscosity are greatly reduced, and good ion transmission capability at-60 DEG C is ensured; lithium salts such as fluorinated aryl sulfonimide lithium are selected and matched with functional additives such as vinylene carbonate, fluoroethylene carbonate and ethylene sulfite to synergistically construct a stable solid electrolyte interfacial film with high ionic conductivity, so that side reaction and capacity fading at low temperature are remarkably inhibited; meanwhile, the siloxane conductive agent and the long-chain glycol dimethyl ether are introduced, so that the permeability, the ion migration rate and the low-temperature stability of the electrolyte are further improved. The electrolyte provided by the invention can be stably applied to new energy automobiles and high-altitude outdoor energy storage systems in severe cold areas of-60 DEG C, and the application range of the lithium ion battery is greatly expanded.

The invention discloses a linear ether and cyclic ether mixed electrolyte for a wide-temperature-range sodium-ion battery as well as a preparation method and application of the linear ether and cyclic ether mixed electrolyte, and relates to a wide-temperature-range electrolyte as well as a preparation method and application of the wide-temperature-range electrolyte. The invention discloses a linear ether and cyclic ether mixed electrolyte for a wide-temperature-range sodium-ion battery. The linear ether and cyclic ether mixed electrolyte comprises sodium salt and an ether-based solvent, the sodium salt is sodium trifluoromethanesulfonate; the ether-based solvent is a mixed solution of straight-chain ether and cyclic ether; the straight-chain ether is diethylene glycol dimethyl ether; the cyclic ether is tetrahydrofuran or dimethyl tetrahydrofuran. The straight-chain ether and cyclic ether mixed electrolyte of the wide-temperature-range sodium-ion battery provided by the invention has a low freezing point, low viscosity, high ionic conductivity and high sodium ion transference number in a wide temperature range, and low desolvation energy, and can reduce the interface charge transfer impedance of an electrode-electrolyte, so that the performance of the battery is improved. Sodium ions can be quickly embedded and separated when reaching the electrode, so that the wide-temperature-range performance of the sodium ion battery is improved, and the sodium ion battery has excellent wide-temperature-range charge-discharge specific capacity, cycling stability and high-rate performance.

The present application relates to a synthesis method of deuterium-labeled substances containing deuterium atom structural units, which comprises mixing aryl chloride with deuterium water in an organic solvent, adding a catalyst of ethylene glycol dimethyl ether-nickel dichloride and a ligand of 2,9-dimethyl-1,10-phenanthroline, and then reacting under the condition of zinc powder and nitrogen protection to obtain the deuterium element labeled compound. The present application uses ethylene glycol dimethyl ether-nickel dichloride as a catalyst, and aryl chloride can react with deuterium water to generate deuterium atom substitution products under the condition of nitrogen at normal temperature and pressure. The reaction condition is simple and mild. Meanwhile, the range of alternative substrates is more extensive, and the use of inexpensive nickel as a catalyst has higher economic value compared with the previous reports.

This invention discloses a method for synthesizing a mordenite molecular sieve-encapsulated metal catalyst for the synthesis of ester compounds, comprising the following steps: 1) mixing a water-soluble metal salt sequentially with an amine ligand and an alkali metal hydroxide to obtain a preliminary mixture solution; 2) mixing the preliminary mixture solution sequentially with an aluminum source and a silicon source to obtain a gel; 3) crystallizing the gel at 160–180 °C, cooling after crystallization, and separating to obtain an initial solid; 4) drying and calcining the obtained initial solid to obtain a preliminary molecular sieve; 5) placing the preliminary molecular sieve in an inorganic ammonium salt solution for ion exchange, separating the reactants after ion exchange to obtain a solid, drying and calcining the solid to obtain a mordenite molecular sieve-encapsulated metal catalyst for the synthesis of ester compounds. The catalyst obtained by this synthesis method can be used for the carbonylation of dimethyl ether to produce methyl acetate, exhibiting a relatively fast reaction rate while maintaining a high conversion rate of dimethyl ether.

The invention provides a single-component polyurethane foam joint mixture which comprises the following raw materials: a white material, a black material and an aerosol propellant, the white material comprises the following components in percentage by weight: 20-40% of polyether polyol, 2-10% of a disulfide bond-containing hydroxyl compound, 2-10% of other hydroxyl and amino compounds, 35-60% of chlorinated paraffin, 1.5-5% of a foam stabilizer, 0.5-2% of a catalyst, 1-5% of an anti-ultraviolet antioxidant and 3-5% of a flame retardant; the black material is isocyanate and comprises PAPI or MDI; the aerosol propellant comprises a mixture of dimethyl ether and propane and butane. The invention further provides a preparation method of the single-component polyurethane foam joint mixture. The preparation method comprises the steps of white material preparation, filling and packaging, curing and the like. The material has excellent toughness and fatigue resistance, and meets the construction requirements of multiple scenes such as severe cold areas and indoor low temperature. The flame-retardant efficiency is remarkably improved, and no negative influence is generated on the foaming ratio, bonding strength and other core properties of foam.

The present invention provides an aerosol composition that does not require emulsification of water and liquefied gas, can be uniformly dispersed for several seconds (e.g., 2 seconds or more) by shaking the container before spraying, can be sprayed with a stable composition, and produces a freezing spray that provides a sustained cooling effect. [Solution] An aerosol composition comprising water, a hydrofluoroolefin having a boiling point of 5 to 30°C, and dimethyl ether, wherein the dimethyl ether content is 10 to 40% by mass, and the composition is separated into two layers.

The invention relates to the technical field of coal chemical industry and discloses a reaction device and method for dimethyl ether carbonylation and ethylene glycol catalytic conversion, and the reaction device comprises a reactor, a first buffer tank, a dimethyl ether pipeline, a liquid storage tank and a nitrogen pipeline, a mixed gas formed by carbon monoxide and hydrogen is contained in the first buffer tank, the dimethyl ether pipeline is used for supplying a dimethyl ether raw material to the reactor, the dimethyl ether raw material, the mixed gas and a first catalyst can perform dimethyl ether carbonylation reaction, mixed alcohol formed by ethylene glycol and methanol is contained in the liquid storage tank, and the liquid storage tank is used for supplying the mixed alcohol to the reactor. And the nitrogen pipeline is communicated with the reactor so as to purge the reacted reactor and supply nitrogen required by the ethylene glycol catalytic conversion reaction. According to the reaction device for carbonylation of dimethyl ether and catalytic conversion of ethylene glycol in the embodiment of the invention, two reactions are carried out through the same reactor, and two sets of complete reaction devices do not need to be additionally built.

Systems and methods are provided for treating, degrading, and incinerating fluorocarbons or fluorinated materials, such as Freon ® with reduced gaseous perfluorinated compound (PFC) emissions. The methods include mixing a fluorinated material with a hydroxide base and optionally a solvent system (e.g., diglyme, polyether, polyether alcohol, polyethylene glycol selected from ethylene glycol and PEG 50 to PEG 3350, N-methyl pyrrolidine, dihydrolevogluton, and / or water ("solvent")) in a batch reactor to form a reaction mixture (also referred to as a suspension). The reaction mixture is heated to a temperature in the range of about 25 °C to about 400 °C for about 0.5 hours to about 240 hours to defluorinate the fluorinated material and produce a defluorinated waste product. More specifically, the methods convert organic fluorine present in the fluorinated material, such as Freon ® to inorganic fluorides. As a result, the defluorinated waste product can be incinerated with reduced harmful gaseous PFC emissions.

This invention relates to the field of traditional Chinese medicine (TCM) health preservation technology, and discloses a TCM weight loss and health preservation method that combines moxibustion, hair combing, and foot therapy to dispel dampness and promote Yang. The composition comprises a solution made from Artemisia argyi volatile oil, 6-gingerol concentrate, isosorbide dimethyl ether, urea, poloxamer 407, decyl glucoside, pH buffer, and purified water. The preparation method involves heating to form a homogeneous eutectic liquid and mixing it with the oil phase. During cooling, a low-tension aqueous phase is pumped submerged. Based on dilution turbidity feedback, the reserved decyl glucoside is used for dynamic repair, resulting in a stable microemulsion system. The health preservation method uses this composition as a foot bath solution, combined with combing the Du and Gallbladder meridians, moxibustion on specific acupoints on the abdomen, and friction on the Yongquan acupoint on the sole of the foot. By addressing the issue of fat-soluble components of TCM easily precipitating and separating in water, the transdermal absorption efficiency is improved. Combined with the synergistic effect of TCM physical therapy, a good dampness-dispelling and health-preserving effect is achieved.

A method and system for purifying methyl fluoride (MeF) by removing dimethyl ether (Me2O) using a lithium salt sorbent, such as LiFSI or LiTFSI, are disclosed. Contaminated MeF is contacted with the sorbent, which preferentially adsorbs Me2O due to strong Lewis acid-base interactions, yielding purified MeF. The process may involve flowing through a sorbent bed, cryogenic collection, temperature differentials, or pumping, with optional multiple cycles for enhanced purity. This approach provides superior efficiency and purity compared to conventional methods, with experimental reductions up to 80% in Me2O content. Alternative salts and porous supports are also provided.

The invention belongs to the technical field of catalytic reaction and separation and purification, and particularly relates to a preparation method of isotope dimethyl ether. The method comprises the following steps: by taking a mixture of a metal oxide nanosheet and a nanosheet-shaped ZSM-5 molecular sieve as a catalyst, carrying out dehydration reaction on isotope methanol under the action of the catalyst; after the reaction is finished, a reaction product enters a U-shaped pipe filled with a water absorption drying agent, is subjected to first-stage separation and purification in an ice salt bath environment, then enters an adsorption bottle I, is subjected to second-stage separation and purification in a liquid nitrogen and ethanol mixed bath environment, and then enters an adsorption bottle II; third-stage separation and purification are carried out in a liquid nitrogen and isopropanol mixed bath environment, finally, reaction products enter an absorption bottle III, and fourth-stage separation and purification are carried out in the liquid nitrogen and isopropanol mixed bath environment. The method provided by the invention can realize high-conversion-rate and high-selectivity generation of dimethyl ether from methanol, and realizes 100% isotope methanol recovery efficiency and 100% separation and collection of isotope dimethyl ether.

This invention relates to the fields of materials science and chemistry, and discloses a method for preparing a metal ion-doped defective FER molecular sieve. The method includes a molecular sieve using Cu and Co as doping ions, with a basic framework of a defective FER molecular sieve having a silicon-to-aluminum ratio of 30-40. The molecular sieve is based on the mass of the defective FER molecular sieve, and the mass percentage of the doping ions is 3-5%. This invention employs a two-step synthesis method. The first step involves hydrothermal crystallization to synthesize a pre-crystallized FER molecular sieve. The second step increases the hydrothermal crystallization temperature, causing the unstable molecular sieve structure to transform into a high silicon-to-aluminum ratio defective crystal form under high temperature and pressure, while simultaneously introducing heteroions into the molecular sieve framework. Compared to traditional techniques, this method can achieve a larger doping amount and is simpler with readily available raw materials. Its application in the catalytic synthesis of ethylene glycol dimethyl ether from ethylene glycol and methanol can achieve high conversion rates and high selectivity, demonstrating significant economic value and market potential.

The present application belongs to the field of activators, and particularly relates to an activator for improving the adhesion of yarn and rubber and the use thereof. The activator is composed of 38-68wt% component A: alkyl silane, 24.2-41.2wt% component B: fatty acid polyoxyethylene ester, 5.5-13wt% component C: triethylene glycol dimethyl ether and 0.6-4.7wt% component D: alkyl phenol polyoxyethylene ether. The activator of the present application can improve the adhesion of yarn and rubber.

Catalytic dehydrogenation of a light alkane gas on a metal oxide catalyst is achieved by (a) pretreating the metal oxide catalyst with dimethylether (DME); and (b) reacting the alkane gas catalytically on the catalyst in a dehydrogenation reaction, under conditions wherein the pretreating improves product yield of the reaction.

This invention discloses a rare-earth element-containing cationic catalyst, its preparation method, and its application, belonging to the field of catalyst technology. Using 732 polystyrene sulfonic acid resin as a support, the target catalyst is prepared in four steps: pretreatment, zirconium coordination modification, aminobisphosphonic acid ligand grafting, and rare-earth ion chelation loading. This invention constructs a Brønsted-Lewis dual-acid synergistic catalytic system through directional structural design, achieving both ultra-stable rare-earth loading and retention of strong acidic sites, significantly improving the catalyst's water resistance, catalytic activity, and cycle stability. This catalyst can efficiently catalyze the synthesis of polyoxymethylene dimethyl ether from industrial formaldehyde aqueous solution and methyl acetal, exhibiting excellent formaldehyde conversion and target product selectivity. It is suitable for both batch and continuous production processes and has good prospects for industrial application.