318 results about "Superacid" patented technology

The invention discloses a method for catalytically decomposing a carbon fiber-reinforced thermosetting epoxy resin composite material. In the method, SO4<2->/MxOy solid superacid is taken as a catalyst; and the method comprises the following steps of: reacting hydrogen peroxide serving as an oxidant with the carbon fiber-reinforced thermosetting epoxy resin composite material to oxidatively decompose thermosetting epoxy resin into the homologues of benzene or phenol and dissolve in an organic solvent, cooling, separating solid form liquid, washing the obtained solid, drying, separating carbon fiber and the SO4<2->/MxOy solid superacid, and distilling the obtained liquid under reduced pressure to obtain decomposed thermosetting epoxy resin residue. Compared with the prior art, the method for catalytically decomposing the carbon fiber-reinforced thermosetting epoxy resin composite material has the advantages of high decomposition efficiency, environmental protection and easy realization, and is a method for recovering the waste carbon fiber-reinforced thermosetting epoxy resin composite material in an environmentally friendly way, wherein the recovery rate of carbon fiber can reach over 95 percent, and the recovered carbon fiber has basically complete surface, does not have residual impurity, and can be recycled.

The invention discloses a method for preparing methyl phenyl hydrogen-containing silicone oil by rare earth super acid catalysis, which comprises the following steps of: taking methyl phenyl cyclosiloxane (DnMe, Ph, wherein n=3, 4, 5, 6), dimethyl cyclosiloxane (Dn, wherein n=3, 4, 5, 6), and methylhydrocyclosiloxane (DnH, wherein n=3, 4, 5, 6) as monomers; adding a blocking agent; and selecting rare earth super acids, controlling the reaction temperature, performing polymerization for a certain period under the protection of N2 gas, gradually raising the temperature to 205 DEG C under -0.9 MPa, and extracting low-boiling substances under reduced pressure to obtain the target product. The method has the advantages that: the catalyst can be separated only by filtering without washing neutralization, and the method has low labor intensity, simple process, simple and convenient operation and no pollution, and is convenient for industrialization. The product prepared by the method has good effects in the LED packaging process.

In some embodiments, the present disclosure pertains to methods of making carbon foams. In some embodiments, the methods comprise: (a) dissolving a carbon source in a superacid to form a solution; (b) placing the solution in a mold; and (c) coagulating the carbon source in the mold. In some embodiments, the methods of the present disclosure further comprise a step of washing the coagulated carbon source. In some embodiments, the methods of the present disclosure further comprise a step of lyophilizing the coagulated carbon source. In some embodiments, the methods of the present disclosure further comprise a step of drying the coagulated carbon source. In some embodiments, the methods of the present disclosure also include steps of infiltrating the formed carbon foams with nanoparticles or polymers. Further embodiments of the present disclosure pertain to the carbon foams formed by the aforementioned methods.

The invention discloses a preparation method of methylsilicone oil, and specifically relates to methyl silicone oil with different viscosity (molecular weight) prepared by using supported solid superacid SO4<2->/ZrO2-ZSM-5 as a catalyst and by adopting inexpensive and commercially available methylsilicone oil (Dn), octamethylcyclotetrasiloxane (D4) and hexamethyldisiloxane (MM), so as to fit various needs. Compared with a conventional catalyst for producing methylsilicone oil, the supported solid superacid catalyst provided by the invention has higher catalytic activity, higher stability, lower cost and the like. More importantly, the supported solid superacid catalyst is in a solid state and can be separated via simple filtration and reused, thereby enabling the production to have the advantages of simple process, convenient operation, no pollutions, no corrosion toward equipment, and the like.

A method for the cationic polymerization of unsaturated biological oils (e.g., vegetable oils and animal oils) based on the cationic reaction of double bonds initiated by superacids is provided. The process occurs under very mild reaction conditions (about 70-110° C. and atmospheric pressure) and with short reaction times. The polymerized oils have a viscosity about 10 to 200 times higher than the initial oil and relatively high unsaturation (only about 10-30% lower than that of initial oils).

The invention relates to a method for manufacturing oleic acid ester by using solid superacid as catalyst. The invention can overcome problems existing in the prior art that products are impure, yield coefficient is low and the prior art can not achieve the object of replacing sulphuric acid as catalyst. For overcoming the problems existing in the prior art, the technical proposal provided by the invention is that: the method for manufacturing oleic acid ester by using solid superacid as catalyst is characterized in that ZrO2 carrier is added into sulphuric acid accelerator to carry out ultrasonic wave dipping in all the process for preparing the solid superacid; after dipping for 20 to 40 minutes, the obtained substance is filtered and parched; as the catalyst, the dosage of the solid superacid is 0.05 percent to 0.5 percent of the quality of the oleic acid. Comparing with the prior art, the invention has the advantages that: the preparation cycle of the solid superacid is shortened and the activity is enhanced; side effect does not easily occur by using the solid superacid as the catalyst; the production technique is simplified. And the invention has convenient post treatment and low energy consumption, and is safe as well as reliable, which suits for the sustainable development requirement of chemical industry.

A process for preparing a hybrid polyester-polyether polyol comprises contacting a carboxyl group-containing component and an epoxide, optionally in the presence of one or more of a double metal cyanide catalyst, a superacid catalyst, a metal salt of a superacid catalyst and/or a tertiary amine catalyst, under conditions such that a hybrid polyester-polyether polyol is formed. The hybrid polyester-polyether polyol offers the advantages of both ester and ether functionalities when used in a polyurethane formulation, thus enhancing physical properties. The process results in products having narrow polydispersity, a low acid number and unsaturation, and reduced byproduct formation, particularly when the double metal cyanide catalyst is employed.

The invention relates to the technical field of recycling of carbon fibers and discloses a method for recycling carbon fibers from a waste carbon fiber resin matrix composite material. The method comprises the following steps: paving a layer of solid superacid SO4<2>/TiO2 powder on the surface of the waste carbon fiber resin matrix composite material; carrying out pyrolysis at 500-700 DEG C for 10-30 minutes in an anaerobic inert environment; and carrying out pyrolysis at 350-450 DEG C for 10-60 minutes in an aerobic environment. According to the method for recycling the carbon fibers by paving solid superacid SO4<2>-TiO2 powder and carrying out two-step pyrolysis treatment, the recycling efficiency is high, the problem that the quality of recycled carbon fibers is lowered is solved, and technical support is provided for cyclic utilization of the carbon fiber resin matrix composite material. The method has the beneficial effects that equipment is simple, the technical process is simple, and the treatment cost is low; and the method has industrial feasibility, and the reutilization convenience of the recycled carbon fibers is greatly improved.

The invention relates to a method for synthesizing polyoxymethylene dimethyl ether, which mainly solves the problems of low reaction efficiency of a solid superacid catalyst, high cost of raw material trioxymethylene and more byproducts after reaction during synthesis of polyoxymethylene dimethyl ether existing in the prior art. In the method, dimethoxymethane and paraformaldehyde are used as rawmaterials, wherein the mass ratio of the dimethoxymethane to the paraformaldehyde is 0.5-10:1; the raw materials are in contact with the catalyst to generate catalytic reaction to prepare the polyoxymethylene dimethyl ether under the conditions of reaction temperature of 70-200 DEG C and reaction pressure of 0.2-6MPa; the amount of the used catalyst is 0.1-5.0 percent; and the used catalyst comprises the following components in percentage by weight: (a) 30-80 parts of molecular sieve carrier; and (b) 20-70 parts of solid superacid. Due to the technical scheme, the problems are solved well; and the method can be used for industrial production of the polyoxymethylene dimethyl ether.

The invention relates to the technical field of chemical engineering, in particular to a preparation method for low hydrogen-containing silicon oil. The preparation method adopts high hydrogen-containing silicon oil (202) and dimethylcyclosiloxane (DMC) as raw materials and hexamethyldisiloxane (MM) as an end-capping agent, under the catalysis of a solid superacid, the temperature is increased to 50-140 DEG C for a telomerization, and the low hydrogen-containing silicon oil is prepared. Compared with the prior art for preparing the low hydrogen-containing silicon oil under the catalysis of vitriol, the preparation method adopts the solid superacid as a catalyst, the catalyst has a good catalysis effect and can be reused, neutralization and washing are not required during the preparation method, and short time is taken by the whole preparation process, continuous method industrial production is likely to be achieved, and the production efficiency is high.

The invention discloses a method for preparing a negative electrode material for a sodium-ion battery from KOH activated pomelo peel. The method comprises the following steps of cleaning a biomass prefabricated part, freezing and drying the biomass prefabricated part, and performing hydrothermal reaction after solid superacid and an ethanol solution are added to obtain a biomass precursor; filtering and drying the biomass precursor, uniformly mixing the biomass precursor and KOH solid according to a certain mass proportion, and performing carbonization in a tubular atmosphere furnace to obtain a carbonization product; and washing and filtering the carbonization product, and drying and grinding the carbonization product to obtain the negative electrode material having a three-dimensional porous communication structure for the biomass carbon sodium-ion battery. By such method, the original porous structure and honeycomb characteristic of biomass are inherited, relatively large specific area and relatively low internal impedance are achieved, a condition is provided for rapid transmission of sodium ions, the capacity of the material is expanded, and the electrochemical property of the material can be remarkably improved.

The invention relates to a ZSM-5 molecular sieve and a preparation method thereof. According to the molecular sieve, the molar ratio of silicon oxide to aluminium oxide is 45-80, the molecular sieve possesses weak acids, strong acids and superacids at the same time, the total acid content is 0.25-0.65 mmol/g, the molar ratio of Bronsted acids to Lewis acids is 1.2-2.1, and the molar ratio of the acid content sum of strong acids and superacids to the acid content of weak acids is 1.2-2. The preparation method comprises: first step, performing crystallization on a mixture containing sodium hydroxide, water, an aluminium source and a silicon source; and second step, adding a proper amount of an aluminium source into the crystallization product of the first step, performing crystallization at a certain temperature, then washing ,drying and roasting to obtain ZSM-5 molecular sieve. The molecular sieve provides an excellent catalytic material for catalytic processes needing relatively more superacid amount or needing different acidity, also the method does not employ any templates, so that the synthetic cost is substantially reduced and the method is green and environment-friendly.

The invention relates to a prepration method of a SO4<2->/ZrO2-MxOy solid superacid catalyst and the application thereof. The preparation method adopts the coprecipitation method for the preparation, thereby obtaining a precursor of a binary mixed hydroxide containing Zr and M (M is equal to Al or Fe), the precursor is carried out the hydrothermal treatment, dilute sulfuric acid is used for soaking, and the solid superacid catalyst with the larger specific surface area is obtained after the high-temperature calcination. The catalyst can obtain good effect, high conversion rate of Alpha-pinene and high selectivity of target products of camphene and limonene by being applied in the Alpha-pinene isomerization reaction.

The invention discloses a method for preparing antioxidant 1,3,5-trimethyl-2,4,6-tri(3,5-di-tert-butyl-4-hydroxybenzyl)benzene by using solid superacid as catalyst, wherein 1,3,5-trihalo methyl-2,4,6-trimethyl benzene and 2,6-do-tert-butylphenol, as raw materials, are subject to alkylation in inert solvent under the action of solid superacid-type catalyst SO42-/MXOY, so as to prepare target products. The method simplifies operating process, achieves mild reaction conditions, has the characteristics of easy separation of products, good reusability of the catalyst, small environmental pollutionand the like, and is suitable for industrial production.

The invention discloses a production method of a solid super acidic catalyst S04<2->/Sb-SnO2, which comprises the following steps: (1) preparing Fe3O4 magnetic nanoparticles; (2) preparing an Sb-SnO2 colloid; (3) preparing Fe3O4/Sb-SnO2 covering powder; and (4) preparing a magnetic solid super acidic catalyst S04<2->/Sb-SnO2. In the invention, antimony doped tin oxide is used for preparing the magnetic solid super acidic catalyst S04<2->/Sb-SnO2, a Hammett tracer method is used for carrying out acid strength characterization on solid super acid, the acid strength H0 is less than -13.8, and issuper acid. The magnetic super solid acidic catalyst S04<2->/Sb-SnO2 disclosed by the invention can be applied in high-acid-value rice bran oil pre-esterification deacidification, so that the original reaction temperature can be reduced to 70 DEG C from more than 200 DEG C before non-strong super acidification, the esterification efficiency can reach over 90%, and the production investment and the management cost can be effectively reduced.

The invention provides a preparing method of mannich base. The method takes three components of aldehyde, amine, ketone or naphthol as a raw material, takes water as a solvent, and takes liquid superacid as a catalyst, the raw material, the solvent and the catalyst are reacted at normal pressure and room temperature, and then recrystallized and dried to obtain the product of mannich base. The method has the advantages of mild condition, convenient operation, environment protection, high efficiency, good selectivity, high productivity and easy realization.

The invention belongs to the field of heterogeneous catalysts, and particularly provides an acid-base bifunctional solid catalyst and a preparation method thereof. The method comprises the steps that a silica-based mesoporous molecular sieve SBA-15 is selected as a carrier, ZrO2/SO4<2-> type solid superacid is loaded, obtained solid superacid is subsequently grafted with an acidic -SO3H group and a basic -NH2 group through a silane coupling reaction, and the acid-base bifunctional solid catalyst is obtained. The defects that in the reaction field of preparing 5-hydroxymethylfurfural (5-HMF) from cellulose, the activity is not high, and the selectivity is poor are overcome, and the preparation method of the acid-base bifunctional heterogeneous solid catalyst with a large specific surface area is provided.

The invention relates to a method for catalytic production of trimethylolpropane oleate by using solid superacid and an application of the method. The method comprises the following steps: esterification reaction: mixing trimethylolpropane with oleic acid according to the weight ratio of 1:(2.1-9.5), simultaneously adding the solid superacid, and carrying out reaction under the vacuum degree of 10-1000Pa and the temperature of 120-200 DEG C for 4-10 hours; filtration: using a 10-600 mesh filter mesh or a filter plate to filter reaction products, and removing the solid superacid; and removal of unreacted reactants: heating the reaction products after the filtration to 180-300 DEG C, keeping the vacuum degree of a system at 1-1000Pa, carrying out vacuum distillation for 40-120 minutes, and removing the unreacted reactants to obtain the trimethylolpropane oleate. The method has the advantages of solving the problems of complex product separation, poor product quality, dark color, more side reactions, environmental pollution and the like caused by the use of sulfuric acid during the traditional production processes of the trimethylolpropane and the oleic acid.

The invention provides a synthesis method for zeolite-coated precious metal particles. The synthesis method comprises the steps that 1, a metal salt solution of platinum-containing soluble salt and/or palladium-containing soluble salt is taken to be mixed with a silicon source and/or an aluminum source, a template agent, a pH value regulating agent and water, gel is obtained through stirring, and dry gel is obtained through drying; 2, crystallization is performed by adopting a dry gel steam assisting method; 3, a product obtained through crystallization is calcined for 5-8 hours in an air atmosphere and then reduced for 2-4 hours in a hydrogen atmosphere. According to the method, by learning from the characteristics of synthesizing Silicate-1-coated precious metal through a steam assisting converting method, a precursor of solid superacid is introduced in the synthesizing process of mordenite and Beta zeolite, synthesis of a zeolite molecular sieve of which pore channels contain precious metal is successfully achieved, and the catalytic property of the catalyst in a light paraffin isomerization reaction is further improved.

The invention belongs to the technical field of catalysts, and particularly relates to a SO42-/nano TiO2 catalyst used in preparation of cyclohexenyl cyclohexanone through cyclohexanone self-condensation and a preparation method. In the invention, nano titanium dioxide is used as a raw material; mixing of sulfuric acid and nano titanium dioxide is promoted by using an impregnation method; and then drying and high-temperature roasting are performed to prepare the SO42-/nano TiO2 slid super acidic catalyst. The catalyst is applied to cyclohexanone self-condensation for catalytic synthesis of the cyclohexenyl cyclohexanone; and at the reaction temperature of 130-150 DEG C, the using amount of the SO42-/nano TiO2 catalyst is 2-5 percent, the reaction time is 2-3 hours, the cyclohexanone conversion rate is 45-65 percent, and the cyclohexenyl cyclohexanone selectivity reaches 97-99 percent.