52results about How to "Acidic" patented technology

The invention relates to a beta/ZSM-5 compound borosilicate molecular sieve. Non-water chemical constitution expression of the molecular sieve is: xNa2O.B2O3.ySiO2, wherein, x is 0.03-2 and y is 10-400. The molecular sieve is prepared by adding beta borosilicate molecular sieve, which is taken as inoculating seed, to synthetic materials of the ZSM-5 compound borosilicate molecular sieve by hydrothermal crystallization; therefore, the molecular sieve has strong acidic property and high aromatization performance.

The invention relates to a magnetic bifunctional catalyst, a preparation method therefor and application of the magnetic bifunctional catalyst in a methanol catalyzed reaction and belongs to the technical field of magnetic bifunctional catalysts and fine chemical industry. According to the magnetic bifunctional catalyst, the surface of each magnetic Fe3O4 core is coated with a TiO2 shell layer with a mesoporous structure, and mesopore of each TiO2 shell layer are loaded with catalytic active components such as Pd, Au and Pd-Au. The method comprises the steps: preparing Fe3O4 cores with super paramagnetism; then, coating the surface of each magnetic Fe3O4 core with the TiO2 shell layer with the mesoporous structure by an ultrasonic-hydrothermal method in a manner of taking titanium sulfate, titanyl sulfate and the like as a titanium source and taking polyethylene glycol as a template agent, so as to prepare magnetic TiO2@Fe3O4 nanospheres; and finally, loading the catalytic active components such as Pd, Au and Pd-Au into the mesopore of each TiO2 shell layer. The magnetic bifunctional catalyst has very good methanol conversion ratio and overall selectivity of methylal and methyl formate, and the reacted catalyst can be separated and recovered by an external magnetic field.

The invention discloses a method for repairing cyanide-polluted soil by a physical heat analysis technology. The method comprises such steps as control of a water content theta m of the cyanide-polluted soil below 20%, smashing of the soil to reach an aggregate diameter below 2 cm, feeding of the soil into a physical heat analysis kiln for repairing and tail gas treatment. The method is adopted to repair the cyanide-polluted soil, so that the high-concentration cyanide-polluted soil can be treated, the problem that the soil physicochemical properties are largely changed by a chemical oxidation method is solved, the soil dehydration difficulty in actual engineering operation is prevented, and the repair rate can reach above 99%.

The invention relates to the technical field of a clean energy source, in particular to a coal and biomass mixing process. The mixing liquification of coal, biomass and oil is creatively realized forthe first time. Firstly, coal and biomass raw materials are subjected to treatment of crushing, compression and secondary crushing; then, slurry is prepared; biomass coal oil slurry with high solid content and capability of being stably conveyed by a pump is successful obtained, so that high-viscosity waste oil which cannot be used as a coal and biomass liquification solvent in the prior art can also be utilized. Hydrogen gas is introduced into the biomass coal oil slurry for reaction, so that coal and biomass are liquified at high pressure and high temperature; then, cracking and hydrogenation reaction are further performed, so that the conversion of coal and biomass into biological oil is realized. The process provided by the invention has the advantages that the coal and biomass conversion rate can reach 90 to 99 percent; the yield of the biological oil can reach 60 to 80 percent; the residue quantity is not higher than 2.5 weight percent.

The invention discloses a cobalt-chromium modified catalyst and a production method and application thereof. The cobalt-chromium modified catalyst contains the raw materials of (1) a catalyst carrierand (2) a metal catalyst, wherein the catalyst carrier comprises titanium dioxide; the metal catalyst comprises a chromium source precursor, a cobalt source precursor, a vanadium source precursor anda molybdenum source precursor; and in the catalyst, the vanadium content is not lower than 2 wt%. According to the catalyst, not only can nitric oxides be removed efficiently by the catalyst, but alsosulfur-containing volatile organic matters are subjected to catalytic oxidation, so that synergistic purification of the sulfur-containing volatile organic matters and NOx is achieved at least.

The invention discloses a lead-containing catalyst which is prepared by the following method: grinding lead-containing blast furnace dust by using a ball mill, and conducting sieving by using a 75-400-mesh sieve; drying the sieved lead-containing blast furnace dust in a drying oven at 75-105 DEG C for 5-48 hours to obtain pretreated lead-containing blast furnace dust; and putting the pretreated lead-containing blast furnace dust into a high-temperature tubular reaction furnace, conducting calcining in inert gas at 200-1000 DEG C for 1-24 hours, setting the gas flow rate to be 1-40 mL/min, andscreening the calcined sample with a 75-400-mesh sieve to obtain the required lead-containing blast furnace dust catalyst. The catalyst has acidity and alkalinity at the same time, and can be automatically separated from a liquid product through standing. The catalyst can be directly used for reaction of high-acid-value oil, the catalytic effect is very good, the biodiesel yield is greater than 95%, and the catalyst recovery rate is greater than 90%. Moreover, the recycling capability is relatively excellent, and the yield of biodiesel after five times of reaction can also reach 80% or above.

The invention discloses a carbon-based magnetic solid acid catalyst and an application thereof in preparing biodiesel. The catalyst is prepared by the following steps: mixing a CMC solution and a Fe<3+> solution; precipitating a solid and then soaking the solid with the Fe<3+> solution; calcining and grinding the dried solid to obtain a magnetic material; then mixing the CMC with a Zr<2+>/ Fe<3+> solution; and after drying the solid material, sulfonating, filtering, washing, freezing and drying the solid material to obtain the carbon-based magnetic solid acid catalyst. The catalyst has Lewis acidity and acidity of a formula as shown in the description and has relatively proper saturated magnetic intensity, can be directly used for a reaction on high acid value oil, and is quite good in catalytic effect. The biodiesel yield is greater than 95% and the recovery rate of the catalyst is greater than 90%. The catalyst is relatively preferable in circulating capacity, and the yield of biodiesel after reactions for 5 times also can reach 80% or above. The deactivated catalyst is reacted circularly for 5 times through sulfonating treatment, and the biodiesel yield still can reach 90% or above.

The invention relates to the technical field of clean energy, particular to a coal and biomass co-refining process. According to the present invention, the mixing liquefaction of coal and biomass is firstly achieved; coal and a biomass raw material are sequentially subjected to crushing, compressing and re-crushing, then a slurry is prepared so as to successfully obtain the biomass coal water slurry having the high solid content and capable of being stably conveyed by a pump, a reaction is performed by introducing hydrogen into the biomass coal water slurry so as to hydrolyze the coal and thebiomass at a high temperature under a high pressure, and the hydrolyzed product is further subjected to cracking and hydrogenation so as to achieve the conversion of the coal and the biomass to biological oil; and with the process, the conversion rate of coal to biomass is up to 90-100%, the yield of the biological oil is more than 60-86%, and the generated coke is less than 0.1%.

The invention discloses a method for preparing a hydrotalcite coating on the surface of a magnesium alloy by combining acid pretreatment and a steam method, and mainly solves the technical problem that the corrosion resistance of a hydrotalcite coating in the prior art is not ideal. The method comprises the following steps: (1) pretreating the surface of a magnesium alloy matrix; (2) carrying out acid pretreatment on the pretreated magnesium alloy matrix; and (3) preparing the hydrotalcite coating on the surface of the magnesium alloy matrix subjected to acid pretreatment through an in-situ steam method, wherein an acid solution adopted in acid pretreatment is an organic weak acid solution, and the organic weak acid is at least one of oxalic acid, an acetic acid solution or citric acid. The hydrotalcite coating obtained by the invention has the characteristics of compact structure, strong adhesive force, good corrosion resistance and long service life.

The invention discloses a preparation method of a superhydrophobic oil-water separation fabric based on chemical copper plating. The preparation method comprises the following steps of treating the fabric with sodium alginate; firstly immersing the fabric in a nickel salt solution for nickel absorption treatment, and then immersing the fabric in a sodium borohydride solution for activation treatment after cleaning the fabric; immersing the fabric in a copper plating solution for copper plating treatment to obtain a copper-plated fabric; and immersing the copper-plated fabric in a corrosive zinc salt solution, and then immersing the copper-plated fabric in a dodecanoic acid ethanol solution after cleaning the copper-plated fabric. A contact angle of the uperhydrophobic oil-water separationfabric prepared by the invention can reach 159 degrees, and the separation efficiency of mixed liquor of dichloromethane and water can reach 99%, and after 60 times, the separation efficiency can still reach 96%.

Belonging to the field of environment functional materials, the invention provides an organic solid catalyst, and solves the technical problems that in the reaction of preparing 5-hydroxymethylfurfural (HMF) from cellulose, the catalyst dosage is great but the HMF yield is not increased, and HMF further converts into a by-product in the reaction. A nanotube hydrophobic catalyst is prepared by a cationic polymerization method, and acid modification is carried out on the catalyst so as to be used as the catalyst for converting cellulose into HMF.

The invention provides a rhombic hollow dodecahedron potassium phosphate noncrystal and a synthesis method thereof and belongs to the technical field of preparation of visible light catalysis materials. The synthesis method comprises the following steps: mixing sylvite with phospho-wolframic acid to perform a hydrothermal reaction by virtue of taking de-ionized water as a solvent; and taking a precipitate, washing the precipitate with the de-ionized water and absolute ethyl alcohol, and drying the washed precipitate, thereby obtaining the rhombic hollow dodecahedron potassium phosphate noncrystal. By use of a simple and convenient method, rhombic hollow dodecahedron potassium phosphate nancrystal is synthetized by one step under mild conditions, so that uniform-appearance hollow rhombic dodecahedron nanocrystal is obtained. The nanocrystal has a unique hollow rhombic dodecahedral special structure; by virtue of nano pores, the capability of effectively degrading dye pollutants is displayed; after being irradiated by visible light for 90 minutes, the rhombic hollow dodecahedron potassium phosphate noncrystal has the capability of effectively degrading dye pollutants and nearly completely degrading RhB, and can be repeatedly used for multiple use.

The invention provides a preparation method of chloranil, and belongs to the technical field of chemical production. According to the invention, glacial acetic acid is used as a solvent, and glacial acetic acid has certain solubility to tetrachlorohydroquinone, but has very low solubility to the product tetrachlorobenzoquinone, thus being beneficial to improving the product yield; the glacial acetic acid is acidic, so that the oxidability of nitric acid can be improved when the nitric acid is used as an oxidizing agent. Nitric acid or chlorine is used as an oxidizing agent to oxidize tetrachlorohydroquinone to prepare tetrachlorobenzoquinone, the raw materials are cheap and easy to obtain, the operation method is simple, the reaction route is short, the equipment investment is low, the market competitiveness in the production cost is extremely high, the product yield is higher than 98%, special purification treatment is not needed, and the final product purity is higher than 99.0%.

The invention discloses a preparation method of a nano calcium silicate composite soil repair liquid and a treatment method of soil contamination thereof, and relates to the technical field of soil remediation. According to the method, a sodium silicate solution is prepared by hydrolyzing sodium silicate; then the sodium silicate solution is catalyzed by a nano immobilized catalyst for 1-2 hours;and calcium hydroxide is added into the sodium silicate solution, the pH value is adjusted to be 10-12 to react and generate a composite solution of nano calcium silicate and sodium hydroxide, namelythe composite soil repair liquid is obtained, and the repair liquid is sprayed on the surface of the soil to be restored. The preparation method of the composite soil repair liquid is simple to prepare, low in cost, and operation is carried out conveniently in field, the soil to be restored can be directly repaired; and meanwhile, the repairing liquid contains the sodium hydroxide which can neutralize the acidity of the soil, so that the purpose of improving the acidity of the soil is achieved.

The invention relates to the field of genetic engineering, specifically to high-temperature high-specific activity acidic beta-mannanase Man5A and a coding gene and application thereof. The amino acid sequence of the Man5A is represented by SEQ ID No. 1 or SEQ ID No. 2. The invention provides a novel mannanase gene; and mannanase coded by the gene has the advantages of acidity, high temperature, high specific activity, good heat resistance and good antiprotease capacity and can be used in the industries like feeds, food, medicines. With a technical scheme provided by the invention, production of mannanase with excellent properties and industrial applicability can be realized by using genetic engineering means.

The invention discloses a deoxidation and isomerization catalyst . A preparation method of the deoxidation and isomerization catalyst comprises the steps of hydrothermal reaction, dipping, alcohol washing, drying and the like, and the obtained molybdenum oxide/modified nano oxide composite catalyst can be used for deoxidation and isomerization of biomass oil. The catalyst comprises zirconium oxide with different crystal forms, an additive and an active component, wherein the additive is one or more of phosphorus compounds; the active component is one or more of a molybdenum compound and a tungsten compound; the number of Brphinsted acid sites and the acid strength can be increased through the phosphorus modified oxide, so that the hydrodeoxygenation and isomerization performance of the catalyst is improved; molybdenum or tungsten is introduced as an active center, sulfide obtained after vulcanization and molybdenum or tungsten oxide which is not vulcanized on the interface of the carrier and molybdenum sulfide synergistically provide a catalytic active center for hydrodeoxygenation and isomerization.