46results about How to "Resolve volatile" patented technology

The invention relates to a preparation method of a transition metal modified silicon-magnesium zeolite catalyst. The preparation method comprises steps as follows: a, magnesium sulfate is added to deionized water, concentrated sulfuric acid is added, and a solution A is obtained; b, a silicon source is added to the deionized water, and a solution B is obtained; c, the solution A is slowly added to the solution B, meanwhile, a template agent is added, and a solution C is obtained; d, the solution C is stirred for 0.5 h at high speed, and obtained gel is put in a hydrothermal crystallization kettle for crystallization; e, a solution obtained after crystallization in the step d is subjected to suction filtration, a mother solution is removed, a product is dried in a drying oven at the temperature of 100 DEG C for 24 h, and raw silicon-magnesium zeolite powder is obtained; f, the raw silicon-magnesium zeolite powder is added to a metallic nitrate solution and stirred for 2 h, a co-precipitation agent is dropwise added, pH is regulated to 10, a mixture is stirred and dried in the shade, and a catalyst precursor is obtained; g, the catalyst precursor is roasted at the temperature of 500-600 DEG C. The silicon-magnesium zeolite catalyst prepared with the method has the advantages of high catalytic activity and good stability.

Belonging to the field of fine chemical industry, the invention in particular relates to a method for preparation of m-aminobenzenesulfonic acid by catalytic hydrogenation. The method includes: taking sodium m-nitrobenzene sulfonate as the raw material, adding water for dissolving, boiling the mixture by activated carbon, conducting hot filtration, adjusting the pH value of the filtrate to 7.5-8.5 by a sodium hydroxide aqueous solution, employing Pt-Ru / C as a catalyst to perform hydrogenation reduction for preparation of m-aminobenzenesulfonic acid, ending the hydrogenation reduction reaction when the hydrogen pressure no longer changes, filtering out the Pt-Ru / C catalyst at the end of the reaction, firstly washing the catalyst by ethanol, then carrying out washing recycling, with the recycled catalyst being able to be applied over 50 times and still having a conversion rate and selectivity up to 99%; and subjecting the obtained filtrate to acid precipitation to pH of 2, thus obtaining a white crystal, i.e. the target product m-aminobenzenesulfonic acid. The method provided by the invention lowers the catalyst cost, improves the utilization rate of equipment, and also overcomes the problems of pollution and energy consumption in the regeneration process of the catalyst.

The invention discloses a method for preparing a bimodal mesoporous structure Ni / SiO2-ZrO2 catalyst used for partial oxidation of methane and belongs to the technical field of the natural gas chemical industry and the coal chemical industry. The bimodal mesoporous structure Ni / SiO2-ZrO2 catalyst loaded with the active component nickel is prepared with the impregnation method, the catalyst has a large specific surface area and a large pore volume, and pore size distribution is even. The preparing method is simple, catalytic activity on partial oxidation of methane is quite high, and catalyst deactivation caused by sintering and carbon deposition can be effectively restrained. The Ni / SiO2-ZrO2 bimodal mesoporous material has two mesoporous diameters, the larger diameter can meet the requirement of diffusion of reactants and products, and the smaller diameter enables adsorption and reaction places to be available for reactants; meanwhile, pore size distribution is narrow and can be adjusted within a certain range, so that requirements of different reactions can be met, and a new way is provided for development of new industrial catalysts. The preparing method is simple, the reaction condition is mild, and industrial production is facilitated.

The invention relates to a Fischer-Tropsch synthesized Co-based fluidized bed catalyst and a preparation method thereof, mainly solving the problems existing in the prior art because an Fischer-Tropsch synthesis reaction is a strong exothermic reaction which causes thermal withdrawal difficulty in a reactor, temperature runaway and easy catalyst inactivation in case of using a fixed bed, and relatively low selectivity of heavy hydrocarbon in case of using a fluidized bed. By adopting the preparation method and the technical scheme that at least one of oxides of Si or Al or a mixture of the atleast one oxide and ZrO2 is selected as a carrier, and the active constituent contains the following composition with a chemical formula in the atomic ratio of Co100AaBbOx, wherein A is selected fromat least one of alkali metal or alkaline earth metal, B is selected from at least one of Cr, Ni, Cu and Zn to be combined into a catalyst, the invention favorably solves the problems and can be used in the industrial production of the Fischer-Tropsch synthesis reaction.

The invention discloses a catalyst for steam reforming of biomass tar and a preparation method thereof. The catalyst for steam reforming of biomass tar is composed of an active component and a carrier, and the active component is Ni-NiO. The carrier is non-metal nitrogen-doped mesoporous cerium oxide (N-CeO 2 ). The preparation process is to dissolve urea, nickel nitrate, and cerium nitrate in deionized water in proportion, and then slowly air-dry at a certain temperature after stirring evenly. Biomass tar steam reforming catalyst is obtained by thermal treatment and activation in a mixture of hydrogen and nitrogen. This catalyst not only has a large specific surface area, uniform and adjustable pore size, but also shows high activity and stability in the catalytic aspect of biomass tar steam reforming. , and the preparation method is relatively simple and easy to expand.

The invention relates to a fluidized bed method for producing p-xylene through shape-selective toluene and methanol alkylation, and mainly solves the problem of lower selectivity for p-xylene in the prior art. The fluidized bed method for producing the p-xylene through the shape-selective toluene and methanol alkylation comprises the steps as follows: 1), raw materials enter a reaction zone of a fluidized bed reactor after heated and are contacted with an alkylation catalyst, and a mixture flow of the p-xylene is generated; 2), the mixture flow enters a rapid gas-solid separation zone, a separated gaseous product enters a follow-up separation section, a separated catalyst enters a toluene pre-contact region, at least one part of the catalyst in the toluene pre-contact region enters a regenerator for regeneration after steam stripping by a steam stripping zone, and a regenerated catalyst is formed; and 3), the regenerated catalyst returns to the reaction zone for continuous reaction. With the adoption of the technical scheme, the problem is solved, and the method can be applied to p-xylene production.

The invention involves an in -site analysis method and application of an intracellular protein complex.In this method, use the parcel crosslinker carrier to incubate with the cells, use intracellular swallowing, and transport the linked agent to a specific part of the cell, and release the chemical cross -linked agentEssenceSubsequently, the protein extraction method based on ionic liquid was used to extract protein and its complexes, and further combined with mass spectrometry technology to analyze the in situ analysis of intracellular protein complexes.This method is of great significance for resolving the dynamic changes in the time and space of the cells in the cells, understanding the process of life, understanding the process of life, revealing the disease mechanism, screening biomarkers, and finding drug targets.

The invention relates to a titanium dioxide microsphere@all-silicon silica-1 molecular sieve core-shell-structured catalyst, and a preparation method and application thereof. The nuclear phase of the catalyst is a titanium dioxide microsphere, and the shell layer of the catalyst is an all-silicon silica-1 molecular sieve; and the catalyst is applicable to industrial production for diphenyl carbonate through transesterification of dimethyl carbonate and phenyl acetate.

The invention innovatively provides a cyclohexanone ammoximation method. The method comprises steps as follows: hydrogen peroxide, an inhibitor of hydrogen peroxide, cyclohexanone and a low-carbon alcohol aid are mixed in a certain proportion to form a mixed liquid, and the mixed liquid is sent to the top of an oximation reactor to be dispersed into 1-200 mu m fine particles; mixed gas of inert gas and ammonia gas is preheated and sent into the oximation reactor to be contacted with the dispersed fine particles, and the dispersed fine particles are further gasified; the gasified fine particles and ammonia gas are placed on a titanium-containing catalyst in the oximation reactor for a cyclohexanone ammoximation reaction, the reacted mixture is separated, and a product is obtained. The problems that a catalyst in the prior art is easily inactivated, follow-up separation is difficult, membrane blocking is serious, the effective utilization rate of hydrogen peroxide is lower and the like can be effectively solved, and the cyclohexanone ammoximation method has broad and good industrial prospect.

The invention relates to a Tropsch synthesis method for heavy hydrocarbons, which mainly solves the problems that the reaction heat dissipation is difficult, temperature runaway is easily caused and the catalyst is easily inactivated when a fixed bed is used and the selectivity of the heavy hydrocarbons is low when a fluidized bed is used in the prior art because the Tropsch synthesis reaction is strong heat generating reaction. Synthesis gas is used as a raw material; under the conditions that the reaction pressure is 0.5 to 10MPa, the reaction temperature is 200 to 600 DEG C, the reaction space velocity is 100 to 8,000 per hour and the H2 / CO molar ratio of the raw material gas is 0.1-5.0: 1, the raw material is contacted with a cobalt-based fluidized bed catalyst in the fluidized bed and reacted to generate the heavy hydrocarbons, wherein the heavy hydrocarbons are hydrocarbons of over C5; and in the cobalt-based fluidized bed catalyst, at least one of oxides of Si and Al or mixture of Si or Al and ZrO2 is selected as a carrier, and the active ingredient contains the following compound with chemical formula in an atomic ratio: Co100AaBbOx, wherein in the formula, A is selected from at least one of alkali metals or alkaline earth metals, and B is selected from at least one of Cr, Ni, Cu and Zn. According to the technical scheme, the problems are well solved, and the method can be used in the industrial production of fluidized bed Tropsch synthesis reaction.