96results about How to "Good catalytic effect" patented technology

The invention relates to an imidazole grafting-type ionic liquid catalyst, which is hydroxide of 1-propyl (triethoxysilyl)-3-methylimidazole grafted on a carrier. The representation formula of the imidazole grafting-type ionic liquid catalyst is [Smim]OH/X and a mass grafting amount of ionic liquid is between 5 and 25 percent, wherein Smim represents 1-propyl (triethoxysilyl)-3-methylimidazole; and X represents the meso-porous carrier. The imidazole grafting-type ionic liquid catalyst has the advantages of good catalytic effect, high conversion rate of propylene oxide, 100 percent of selectivity of propene carbonate, mild reaction condition and capability of being recycled better.

The invention discloses a preparation method of a sulfur doped Ni-Fe hydroxide nano-film catalyst for decomposing water to produce oxygen. According to the method, an aqueous solution which contains NiCl2, FeCl2, thiocarbamide and polyethylene glycol 1,000 is used as electrodeposition liquid, and a sulfur doped Ni-Fe hydroxide nano-film catalyst is directly electro-deposited on the surface of a metal strip or a foam metal substrate by an electrodeposition method. The preparation method is simple, the cost is low, the obtained catalyst is used for catalyzing decomposition of water to produce oxygen, a function of reducing overpotential of oxygen evolution of electrolysed water is good under larger current density, the catalytic activity is high, and the catalyst cannot drop from the surface of the substrate easily.

The invention discloses a method for preparing platinum nano-porous electrode by electrodeposition, which pertains to the technical field of material preparation and electrochemical detection. The method includes that: a layer of platinum alloy is deposited on a substrate of a working electrode by electrodeposition, and then the substrate is carried out inverse alloying by electrochemical etching, so as to form the platinum nano-porous electrode. The method of the invention has the advantages that: a high quality platinum nano-porous electrode can be obtained, with the surface area improved by over 500 times than that of a planar electrode and has good catalytic effect, which can completely satisfy the requirements of measuring glucose without enzyme; the preparation steps of the electrode is simple, with small quantity of reagent, low cost and easy operation; and the operation can be conducted under normal temperature, which has no danger of high temperature and is safe and environment protective.

The invention discloses a titanium-silicon molecular sieve and resin composite catalyst and a preparation method thereof. The catalyst mainly comprises a titanium-silicon molecular sieve and resin. The preparation method comprises the following steps of: fully mixing titanium-silicon molecular sieve powder, a polymeric monomer and a porogen, performing polymerization reaction in the presence of an initiator to obtain a blocky solid catalyst, crushing, adding into halogenated hydrocarbon for swelling, and performing solvent extraction to obtain a formed catalyst. The catalyst prepared by the method solves the problem that titanium-silicon catalyst powder and reaction liquid are difficult to separate, improves reaction efficiency, is applied to the catalytic reaction process of olefin epoxidation in a fixed bed process, and has good catalytic effect.

The invention discloses a catalytic synthesis method of tri-octyl tri-meta-benzoate. A solid oxide is adopted as a catalyst and has a better catalysis effect; the catalytic synthesis method is an innovative novel catalytic synthesis process; the catalyst can be recycled; and the obtained tri-octyl tri-meta-benzoate is light in color and has high mass resistivity. Non-acid catalysis is adopted, and operations of neutralization and water washing are not needed in a production process, therefore, an aftertreatment procedure is simplified, and no wastewater is discharged in a production process; and the catalytic synthesis method is a cleaner production process, and accords with the requirement of relevant industrial policies for encouraging energy saving and emission reduction in the chemical engineering industry in China.

The invention discloses a catalytic preparation method of dicyclopentadiene dioxide by quaternary ammonium heteropoly phosphato tungstate, which is characterized by comprising the following steps: epoxidation reaction: adding the raw materials of dicyclopentadiene, solvent I and quaternary ammonium heteropoly phosphato tungstate in a reactor, heating the temperature to 30-80 DEG C, stirring and dropwise adding aqueous hydrogen peroxide solution, and reacting for 3-36h under the temperature of 30-80 DEG C after dropwise adding; post-treatment: cooling the reacted materials to room temperature, evaporating solvent I by reduced pressure distillation and separating and removing water to obtain the mixture of the product and the quaternary ammonium heteropoly phosphato tungstate catalyst, dissolving and filtering the mixture by ethyl acetate to obtain filter cake, namely the recovered quaternary ammonium heteropoly phosphato tungstate catalyst, recovering ethyl acetate by performing reduced pressure distillation on filtrate to obtain the crude product, performing recrystallization on the crude product by solvent II, and drying to obtain the product. The invention has the advantages of convenient operation, high safety, small pollution, simple post treatment, and high product yield and purity.

The invention relates to an industrial preparation process for 3,4-difluorobenzonitrile. The method comprises the following steps of: reacting 3,4-dichlorobenzonitrile and anhydrous potassium fluoride under the protection of nitrogen by taking 1.3-dimethyl-2-imidazolone as a reaction solvent and N-bis(dimethylamino)methylene-1.3-dimethyl imidazoline-2-ammonium chloride salt as a catalyst at the temperature of between 200 and 230 DEG C for 20 hours, reacting with rectifying to obtain a 3,4-dichlorobenzonitrile crude product, rectifying the 3,4-dichlorobenzonitrile to obtain high-purity 3,4-dichlorobenzonitrile, and distilling the solvent and recycling. The method has the advantages of simplicity, mild reaction, short period, and high yield.

The invention discloses a method for preparing a titanium silicon molecular sieve catalyst. The method comprises the following steps of: mixing titanium silicon molecular sieve powder, polymer monomer styrene, a polymer monomer multi-alkenyl compound and a pore-forming agent completely; in the presence of an initiator, performing a polymerization reaction; smashing the obtained blocky solid catalyst; adding the smashed catalyst into halohydrocarbon to swell; and performing extraction by using a solvent to obtain the formed titanium silicon molecular sieve catalyst. The titanium silicon molecular sieve catalyst prepared by the method solves the problem that the titanium silicon catalyst powder and reaction solution are difficult to separate and improves the reaction efficiency. The titanium silicon molecular sieve catalyst is applied to a catalytic reaction of alkene epoxidation of a fixed bed process and has excellent catalytic effect.

The invention discloses a preparation method of a mesoporous carbon nitride loaded precious nano particle, which comprises the steps of: with mesoporous silica as a hard template, preparing a mesoporous nitrogen-doped carbon material by using a nano pouring method; then carrying out alkylation reaction by using halohydrocarbon to ensure that the nitrogen-doped carbon surface is subjected to quaternization; enabling an anion group with precious metals to replace a halide ion by means of an ion exchange method, binding on the surface of the material; and finally reducing metal ions by using a reducing agent, and preparing the mesoporous carbon nitride loaded precious nano particle. According to the method, a precious metal particle precursor and a mesoporous material are tightly combined by means of an ion bond, and the precious metal particle is well dispersed on the ordered mesoporous material to form a precious metal/nitrogen carbon compound material. The mesoporous carbon nitride loaded precious nano particle has the activity of the precious nano particle and is high in specific area and large in hole volume of a mesoporous molecular sieve. The mesoporous carbon nitride loaded precious nano particle has excellent catalysis activity and catalysis stability for cathode oxygen reduction of a fuel cell, and has a potential commercial application prospect.

The invention belongs to the field of synthesizing an alkoxy silane monomer, relating to an accelerator of a platinum catalyst for hydrosilylation, which is carboxyl-containing or ethylenic bond-carboxyl-containing modified polyethylene glycol obtained by reaction of polyethylene glycol or methoxy polyethylene glycol with anhydride. The invention also provides a preparation method for the accelerator and an application thereof. The preparation method for the accelerator comprises the following step of modifying the polyethylene glycol or methoxy polyethylene glycol molecular monomer by using anhydride at the temperature of between 20 and 150 DEG C. The accelerator serving as an auxiliary agent is used for establishing a catalyst system for addition reaction of unsaturated olefin and hydrogenalkoxysilane by platinum catalysis, and solves the technical problems that the conventional catalyst has poor catalytic activity and low selectivity.

The invention provides a high-temperature-resistant maleic anhydride (MAH) resin catalyst. The resin catalyst is a high-temperature-resistant strong acid cation catalyzed resin obtained by chlorinating fluorine-containing white balls obtained by copolymerizing an acrylic acid fluorine-containing monomer which has the crosslinking degree 15-30 percent and serves as a third monomer, and performing shallow sulfonation. The high-temperature-resistant MAH resin catalyst has a good catalytic effect in an MAH esterification reaction, high high-temperature resistance and long service life, and can be used at high temperature 100-140 DEG C. The invention further provides a preparation method of the catalyst.

The invention discloses a technique for treating phenol/anisole-containing production wastewater, particularly a method for treating phenol/anisole-containing production wastewater by a floatation-high efficiency extraction-membrane bioreactor (MBR)-catalytic oxidation technique. The technique comprises steps as follows: raw water firstly enters a floatation unit to remove suspended substances, and then enters an extraction unit, wherein an extractant composed of N-octanoylpyrrolidine, tributyl phosphate, dimethyl carbonate and solvent kerosene in a ratio of 0.8:1.2:2.9:7 is utilized to carry out dephenolization treatment; the treated wastewater enters an MBR unit to carry out biochemical degradation of methanol; and the wastewater finally enters a sodium hypochlorite-alpha-Fe2O3 catalytic oxidation unit to remove anisole by deep oxidation. The invention provides a new technique for efficiently treating phenol/anisole-containing production wastewater; and by using the technique, the removal rates of wastewater COD (chemical oxygen demand), volatile phenols, methanol and anisole are respectively up to 99.7%, 99.99%, 99.12% and 99.97%.

The invention belongs to the field of asymmetric catalysis, and discloses an asymmetric hydrogenation method of an alpha-ketone amide compound. The asymmetric hydrogenation method comprises the following steps that under the existence of a catalyst, alkali and a solvent, an alpha-ketone-beta-alkene amide compound is subjected to reduction in the hydrogen atmosphere, and an alpha-hydroxyl-beta alkene amide compound is obtained; and the catalyst is obtained through complexing of metal iridium salt and a chiral ligand, and the chiral ligand is selected from the following compounds: (the formulasare shown in the description). The asymmetric hydrogenation method is easy to operate, high in conversion rate and selectivity and low in cost, has the advantages of being high in atom economy and environmentally friendly, and has a very good industrialized application prospect.

The invention discloses a synthesis method of diglycidyl 4,5-epoxycyclohexane-1,2-dicarboxylate. The method is characterized by comprising the steps of: epoxidation: adding a raw material tetrahydrophthalic acid diglycidyl ester, a solvent, a quaternary ammonium phosphotungstate catalyst and alkaline phosphate into a reactor; heating to 30-80 DEG C; stirring and adding the aqueous solution of hydrogen peroxide, and reacting for 3-12 hours at 30-80 DEG C; and postprocessing: cooling the material after the reaction, standing still for layering; removing the aqueous phase; filtering the organic phase solution to obtain a filter cake, namely that recycled quaternary ammonium phosphotungstate catalyst; distilling the organic phase filtrate and recycling the solvent; and drying the remaining product to obtain a liquid product. The method disclosed by the invention is easy to operate and has the advantages of high safety, low pollution, simple postprocessing and high yield.

The invention discloses uses of an ionic liquid as a catalyst in preparation of liquid crystal polyesters, particularly performing of a polymerization monomer acylation reaction step and/or a meltingcondensation polymerization reaction step after acylation in liquid crystal polyester preparation reaction steps under the catalysis of an ionic liquid, wherein the ionic liquid is obtained by carrying out a reaction on a heterocyclic organic alkali compound containing two or more nitrogen atoms and an anionic functional compound, and the adding amount of the ionic liquid is 5-2000 ppm based on the total amount of all the added polymerization monomer. According to the present invention, the ionic liquid catalyst has advantages of efficient directional catalytic property, obvious catalytic effect and reduced side reaction of polymerization; the ionic liquid has advantages of excellent stability and long-lasting catalytic effect; the prepared ionic liquid can be directly added to the acylation and transesterification reaction system without purification, such that the operation is simple; and the liquid crystal polyester resin prepared under the catalysis of the ionic liquid catalyst hasexcellent tensile strength and excellent notched impact strength.

The invention belongs to the technical field of comprehensive utilization of algae, relates to a method for preparing high-quality fuel by using the algae material through a catalytic liquefying method, and particularly relates to a method for preparing the fuel by using a metal-modified molecular sieve catalyst to catalyze and liquefy the algae material. The method comprises the following steps of: crushing and sieving cleaned and dried algae, mixing the algae material with the metal-modified molecular sieve catalyst and water, then obtaining a mixture, putting the mixture into a reaction kettle, heating the reaction kettle, reacting under the oxygen-free condition, naturally cooling the mixture after the reaction of the mixture is finished, then carrying out normal-pressure distilling treatment on a solid-liquid product, collecting fractions at the temperature of 60-500 DEG C, separating water in the fractions and obtaining combustible fuel. The method has the advantages that the catalytic effect and the deoxygenating effect are ideal, the fuel yield is high, the oxygen content is low, the corrosion of the basic catalyst to equipment is avoided, the preparation process is simple, the principle is reliable, the materials are easily obtained, the quality of a product is good, the economic benefit and the social effect are obvious and the environmentally-friendly effect is good.

The invention discloses a catalyst for preparing synthesis gas by reforming methane and carbon dioxide and a preparation method of the catalyst. The catalyst comprises an active component, an auxiliary agent and a carrier component, wherein the active component is one or more of nickel and cobalt and an auxiliary agent Zr, La, Ce, Co, Mo or V, and Mo mainly exists in the form of MoO3, the carriercomponent is modified aluminum oxide, and the raw materials comprise, by weight, 4-8% of the active component, 80-91% of the carrier component and 5-12% of the auxiliary agent. The invention disclosesa catalyst for preparing synthesis gas by reforming methane and carbon dioxide and a preparation method thereof. Ammonium molybdate and a soluble aluminum-containing compound are used for carrying out modification treatment on an aluminum oxide carrier; the stability of the alumina carrier in the use process is improved, and metal active components in the catalyst can be uniformly distributed onthe surface of the carrier, so that the double functions of sintering resistance and carbon deposition resistance of the catalyst are improved while a good catalytic effect of the catalyst is kept.

The invention relates to a circular type esterification reaction polymer catalyst, belonging to the field of environmentally friendly macromolecule; the solid macromolecule obtained by synthesis can not only serve as catalyst which can be applied to esterification reaction but also achieve the purposes of recycling and easy separation. The polymer catalyst has the structural formula as shown in the right, wherein f, m is any integer from 1 to 1000, R1 is selected from -C6H4-,-COO(CH2CH2O)nOCO-,-COO(CH2CHCH3O)nOCO- or -COOCH2CH2OCOC6H4COOCH2CH2OCO-, and n is any integer from 2 to 10. R2 is selected from -H or -CH3, R3 is selected from -OCOCH3, -COOCH2C2H3O, -COOR4 or -COOR5OH, and R4 and R5 are both alkyl groups with 1-12 carbon atoms.

A dealuminated super-stable Y-zeolite carried heteropoly acid salt catalyst used for the liquid-phase esterifying reaction between acetic acid and butanol is prepared through proportionally mixing USY zeolite with deionized water, steam treaitng, acid washing, filtering, drying, calcining to obtain carrier, immersing in the acqueous solution of the carbonate or nitrate of alkali metal, drying, calcining, immersing in solution of heteropoly acid, drying and calcining.

The invention provides a preparation method of 2-arylbenzimidazole, which comprises the steps of firstly adding ortho-phenylene diamine and benzoic acid or substituted benzoic acid into a reactor, then adding 1,4-dioxane, dropwise adding concentrated sulfuric acid while stirring, stirring for back flow for 3-5h, obtaining a mixed solution, cooling the mixed solution to the room temperature, adding a NaOH water solution into the mixed solution, allowing a solid to be precipitated in the mixed solution, conducting suction filtrationunder reduced pressure, drying, and obtaining 2-arylbenzimidazole. According to the method, 2-arylbenzimidazole is prepared by taking 1,4-dioxane as a solvent and concentrated sulfuric acid as a catalyst and adopting a one-pot method; concentrated sulfuric acid is cheap, easy to get and good in catalytic effect; therefore, the method is simple in operational process, low in cost, and short in reaction time. In addition, with the adoption of the method, as high yield of 2-arylbenzimidazole can be realized without recrystallization, the post-treatment is simple.

The invention belongs to the preparation field of catalysts, and in particular relates to a C@TiO2 solid acid catalyst in a core-shell structure and a preparation method of the C@TiO2 solid acid catalyst. The main preparation process is as follows: reacting biomass and tetrabutyl titanate serving as raw materials for 6-24 hours at 100-200 DEG C, drying and pyrolyzing the product to obtain a catalyst precursor in the core-shell structure, sulfonating the catalyst precursor through sulfuric acid, and drying to obtain the C@TiO2 solid acid catalyst in the core-shell structure. The catalyst has good catalysis activity and stability in acid alcohol esterification and transesterification. The raw material for the catalyst disclosed by the invention is cheap and easy to obtain, the performance is stable, and the large-scale production can be realized. Furthermore, the catalyst solves the common fault that the normal metallic oxide solid acid catalyst is easy to inactivate, and meanwhile, the acid density is increased, so that the acid strength is greatly prompted, the catalysis effect is good, and the catalyst is reusable and environmentally friendly.

The invention discloses a high-efficiency treatment method of methylene blue dye wastewater, comprising the following steps: firstly preparing an AgI/Ag3PO4/TiO2 composite catalyst; then carrying out microwave treatment and citric acid modification on red mud to obtain modified red mud; and finally carrying out absorption treatment on the methylene blue dye wastewater with the modified red mud, and then adding H2O2 to treat the wastewater under the catalysis of the prepared AgI/Ag3PO4/TiO2 composite catalyst. The method can effectively remove pollutants from the dye wastewater and has simple operation and low cost.

The invention relates to a formulation for a biocatalyst for modifying and improving petroleum fuel oil and a production method thereof. The formulation comprises the main components: 1, vegetable fat; 2, methanol; 3, candida rugosa lipase; 4, candida lipase; 5, horse radish peroxidase; 6, hydrogen peroxidase; 7, polyethylene glycol 1,000 to 5,000 (PEG for short); and 8, single methoxy polyethylene glycol 5,000 to 10,000 (MPEG for short). The production method comprises the following production processes and usage amount of raw materials is as follows, according to 1,000 liters of biocatalyst product produced once for modifying and improving the petroleum fuel oil: 1, the first step: using 'biological generator' equipment to produce 'fatty acid methyl ester or ethyl ester'; 2, the second step: taking 10 to 12 grams of hydrogen peroxidase powder and 5 grams of single methoxy polyethylene glycol 5,000 powder, adding 10 milliliters of pure distilled water into the mixture for mixing and preparing; and keeping stand the mixture for 30 minutes; 3, the third step: taking 12 to 15 grams of horse radish peroxidase powder and 8 grams of the single methoxy polyethylene glycol 5,000 powder, adding 12 milliliters of pure distilled water into the mixture for mixing; and keeping stand the mixture for 30 minutes; 4, the fourth step: mixing hydrogen peroxidase preparation and horseradish peroxidase preparation in turn in an organic solution of fatty acid monoester, and keeping stand the mixture for 60 minutes; and 5, packaging the finished product by 200 liters per bucket for standby.

The invention discloses a preparation method of triethylene glycol hydrogenated rosinate, relating to the technical field of chemical industry. The preparation method comprises the following steps of: (A) under protection of inert gas, performing melt refining on a hydrogenated rosin raw material; (B) after complete melting, adding an antioxidant, alcohol and a catalyst, and heating to 272-278 DEG C; (C) preserving heat at 272-278 DEG C and reacting for 5-10 hours so that the acid value index of the material reaches a set value; and (D) vacuumizing for 3-5 hours, cooling and discharging to obtain the triethylene glycol hydrogenated rosinate. According to the preparation method disclosed by the invention, the product color is improved by adding an anti-oxidation aid with good performance; and by adding nano zinc oxide as a catalyst, an obvious catalysis effect is realized, and the reaction time can be reduced by about 1/2.

The invention provides a silicon-aluminum molecular sieve, a preparation method and applications thereof. The silicon-aluminum molecular sieve comprises an aluminum element, a silicon element, and an oxygen element. The pore volume of the silicon-aluminum molecular sieve is 0.3 cm3/g or more. The total specific surface area is 200 m2/g or more, the external surface area is 30 m2/g or more, and the external surface area accounts for 10 to 55% of the total specific surface area. The benzene absorption amount is at least 65 mg for each gram of molecular sieve under following conditions: temperature: 25 DEG C, P/P0=0.10, and absorption time: 1 hour. Under N2 static absorption tests, the micro pore size distribution is in a range of 0.9 to 2.0 nm. The invention provides a cyclic ketone conversion method. The provided molecular sieve containing precious metals has a special physico-chemical structure, the benzene absorption amount is high, and the micro pore size distribution is in a range of 0.9 to 2.0 nm. The molecular sieve can achieve a better catalytic effect, when being applied to reactions that generate circular molecules (especially cyclic ketone molecules) or reactions that circular molecules (especially cyclic ketone molecules) participate in.

The invention discloses a synthesis method of an aromatic vinyl trifluoromethylthio ether compound, and belongs to the technical field of chemical synthesis. According to the synthesis method disclosed by the invention, the aromatic vinyl trifluoromethylthio ether compound is prepared by taking trans-nitro aryl ethylene as a substrate, silver trifluoromethylthio as a thioether reagent and copper trifluoroacetic acid as a catalyst, and adding an oxidizing agent and an additive. Raw materials used by the method are easy to obtain, the reaction is simple to operate, the yield is high, and the substrate universality is good; the obtained aromatic vinyl trifluoromethylthio ether product has important application in the medicine, pesticide and function material fields.

The invention belongs to the technical field of electrochemistry, and relates to a preparation method for a novel polytetrafluoroethylene thermal modified gas diffusion electrode. The preparation method comprises the steps of firstly mixing conductive carbon black, anhydrous ethyl alcohol and polytetrafluoroethylene emulsion to obtain mixtures, and performing heat treatment to the mixtures to obtain the conductive carbon black/PTFE composites; then remixing the obtained composites as precursors with the anhydrous ethyl alcohol and the polytetrafluoroethylene emulsion to obtain mixed emulsion,and rolling the mixed emulsion on a stainless steel net to obtain a preliminary gas diffusion electrode; and calcining the preliminary gas diffusion electrode in a muffle furnace to obtain the novel polytetrafluoroethylene thermal modified gas diffusion electrode. According to the preparation method, the synthesizing technology of a traditional gas diffusion electrode is improved, and PTFE furtherplays a role as a modifier of a conductive carbon black catalyst while the PTFE is used as adhesive, so that the gas diffusion electrode synthesized through two high temperature processes has the advantages of higher catalytic activity and stability.

The invention relates to a preparation method of a Pt3Ni@PtNi2 core-shell structure nanowire. The method comprises the steps that platinum bis(acetylacetonate), nickel acetylacetonate, glucose and cetyltrimethylammonium chloride are added into 5 ml of oil-ammonia for dissolving, the solution is subjected to ultrasonic treatment in an ultrasonic machine to be mixed to be uniform, the mixed solution reacts in an oil bath at the temperature of 200-220 DEG C, an oil bath reaction product is cleaned, and the core-shell structure nanowire is obtained. According to the method, the defects that a traditional imine preparation method is tedious in step, the reaction condition is strict, and the large-scale production cost is high are overcome. According to the core-shell structure nanowire, the catalyst generation method is simple, the catalytic effect is god, and the selectivity is high. A catalytic reaction can be conducted at room temperature and completed at one step, the stability is good, the defects that traditional distillation, reflux and other methods have tedious steps and are high in cost are overcome, the synthesized catalyst can generate aminobenzene by conducting addition on nitrobenzene through hydrogen, the phenomenon that imine is subjected to hydrogenation to generate amine is not likely to occur, and the excellent selectivity of the catalyst on hydrogen addition is embodied.

The invention relates to the field of catalytic materials, and discloses a catalyst for preparation of dimethyl sulfide and a method for synthesis of dimethyl sulfide. The catalyst comprises a molecular sieve; and the catalyst NH3-TPD is characterized by comprising the following characteristics: the desorbed amount of ammonia at 150 DEG C to 250 DEG C is no more than 0.125 mmol/g; the desorbed amount of ammonia at 450 DEG C to 550 DEG C is no more than 0.036 mmol/g; and the total desorbed amount of ammonia at 150 DEG C to 550 DEG C is no less than 0.237 mmol/g. By adoption of the catalyst provided by the invention, a reaction of hydrogen sulfide and methanol can be effectively catalyzed to perform; and the method provided by the invention can obtain higher dimethyl sulfide selectivity, andcan enable the methanol to achieve a higher conversion rate at the same time.

The invention discloses a method for synthesizing a dimer acid by compounding a catalyst. The method comprises the following steps: adding a complex of a catalyst propane sultone and potassium iodide into a vegetable oil acid, sufficiently stirring, uniformly mixing, controlling the pressure to be less than 3atm, implementing reaction for 2-4 hours at 180-220 DEG C, standing still for cooling to100-150 DEG C, and separating the reactant, thereby obtaining crude dimer acid; washing the crude dimer acid with 80-90 DEG C water, centrifuging to dehydrate, feeding into a membrane evaporator to remove steam at 160 DEG C, and further adding into a short-course distiller for separation at 230 DEG C in the vacuum less than 30Pa, thereby obtaining the dimer acid and a monomer acid. The propane sultone and the potassium iodide are adopted to compound the catalyst, the catalysis effect is remarkable, the use amount is very small, the polymerization temperature is relatively low, the phenomenon that the dimer acid is adsorbed by hargil in an ordinary process is avoided, and the content and the yield of the dimer in the product are both further increased.