34results about How to "High molecular sieve content" patented technology

The present invention relates to the field of catalyst molding, and particularly provides a titanium-silicon molecular sieve molding method, which comprises: mixing a titanium-silicon molecular sieve and a water-containing mixture, carrying out hydrothermal treatment under a sealed condition, molding the slurry obtained from the hydrothermal treatment to obtain a molding body, and calcining the molding body, wherein the water-containing mixture contains a silicon element, a titanium element and a nitrogen element, and is at least partially derived from the crystallization mother liquor of the titanium silicon molecular sieve. The present invention provides a molding catalyst prepared according to the preparation method, and applications thereof. The invention further provides a cyclohexanone oxidation method. According to the present invention, with the titanium-silicon molecular sieve molding method, the industrial waste liquid is effectively utilized, and the problems of complex process, corrosion on equipment, harmful emission and the like of the traditional process are overcome; and the molding catalyst has characteristics of high titanium-silicon molecular sieve content, high pore volume, high crushing resistance, and high selectivity to the target product.

The invention provides a preparation method of an FCC (Fluid Cracking Catalyst) catalyst containing a silicon binder. The method comprises the following steps: mixing and pulping clay, molecular sieve slurry, pseudo-boehmite, hydroxyl aluminum chloride (alumina sol) and a silica sol binder to prepare catalyst slurry; then, spraying and drying the catalyst slurry; then, washing and drying the catalyst slurry to obtain a catalyst product. The method is characterized in that three binders pseudo-boehmite, alumina sol and silica sol serve as a compound binder, and the use level of silica sol can be regulated in a larger amplitude, thereby, providing an effectively method for preparing an alumino silica gel FCC catalyst. The catalyst prepared by the method provided by the invention has the characteristics of good strength, strong heavy oil cracking capacity, high light liquid yield and the like.

The invention discloses a wax oil hydrocracking method, which comprises the following steps that (1) a wax oil raw material and hydrogen enters a hydrofining reactor in a mixed manner and are subjected to desulfurization, denitrification and aromatic hydrocarbon saturation reaction; (2) the effluent obtained in the step (1) enters a hydrocracking reactor, wherein the hydrocracking reactor comprises first to nth catalyst bed layers in a material direction, n is greater than or equal to 3, preferably 3 or 4, the first to (n-1)th catalyst bed layers are filled with a hydrocracking catalyst containing a modified Y molecular sieve, and the nth catalyst bed layer is filled with a hydroisomerization catalyst containing beta and/or ZSM-series molecular sieves and other molecular sieves with high isomerization performance; and (3) the effluent of the hydrocracking reactor is subjected to gas-liquid separation and liquid-phase fractionation to obtain naphtha, aviation kerosene, diesel oil and tail oil. According to the method, by using wax oil as a raw material, the yield of heavy naphtha with high aromatic potential is increased and the quality of aviation kerosene and diesel oil products is improved by setting a reasonable catalyst grading mode and modulating the catalyst composition and the structure in grading bed layers.

The invention relates to a preparation method and application of a mixed matrix membrane with a thermoplastic elastomer as the matrix. An unconventional solvent (acid) is employed to prepare a casting solution, and casting is carried out to prepare the mixed matrix membrane. When the molecular sieve content reaches certain degree, a layered structure similar to a composite membrane is formed, under the circumstance of substantial increase of the permeation flux, the selectivity remains unchanged, and the compromise relationship between traditional permeability/selectivity can be overcome. The method has a simple process and is convenient, and the obtained membrane can be used for gas separation, especially CO2/light gas (N2, CH4, H2, O2) separation.

The invention relates to the field of adsorbents, and concretely provides a 5A molecular sieve adsorbent, and a preparation method and an application thereof. The method comprises the following steps:(1) carrying out rolling molding on a powder containing 4A molecular sieve and a binder source to obtain pellets, and drying and calcining the pellets to obtain matrix pellets; (2) pre-wetting the matrix pellets, and carrying out crystal transformation to basically convert the binder in the matrix pellets into 4A molecular sieve in order to obtain 4A molecular sieve pellets; and (3), washing the4A molecular sieve pellets with water, carrying out calcium exchange to obtain 5A molecular sieve pellets, washing the 5A molecular sieve pellets with water, drying the washed 5A molecular sieve pellets, and calcining the dried 5A molecular sieve pellets, wherein the pre-wetting process comprises a stage (1), a stage (2) and a stage (3), and the ambient humidity in the stage (1) and the ambient humidity in the stage (3) are higher than the ambient humidity in the stage (2). The 5A molecular sieve adsorbent has the advantages of high 5A molecular sieve content, large n-pentadecane adsorbing capacity, high adsorbing efficiency and good strength.

The invention relates to a method for preparing olefins by catalytic cracking of light oil, mainly solving the problems of low catalyst activity and low yield of low-carbon olefins in the process of preparing low-carbon olefins by catalytic cracking in the prior art. The method is characterized in that: a binderless molecular sieve are used as a catalyst, light oil containing C4-C10 hydrocarbon is used as a raw material, the raw material is contacted with the catalyst through a catalyst bed to generate low-carbon olefins under the condistions of a reaction temperature of 550-750 DEG C, a reaction gauge pressure of 0.001-0.5 MPa, a reaction weight hourly space velocity of 0.1-4 h<-1>, and a weight ratio of water to light oil of 0.1-3:1, wherein, the binderless molecular sieve catalyst has a pore volume of 0.1-0.3 ml/g, an average aperture of 50-70 nm, a porosity of 20-30 %, and a binder content of 0-5 %; after forming and sintering, the strength of the catalyst is 60-200 N. The invention can be applied in the industrial production of preparing olefins by catalytic cracking of light oil.

The invention belongs to the technical field of adsorbing materials, and particularly relates to a concentrated rotating wheel adsorbing material and a preparation method of the adsorbing material. The adsorbing material comprises a base material, a high-silicon type zeolite molecular sieve ZSM-5, an inorganic binding agent, fumed silica, an activated aluminum oxide precursor, a dispersing agent,alcohol ether, a lubricating agent, oil, an organic binding agent, alcohol and/or cellulose and pure water. The concentrated rotating wheel adsorbing material has the beneficial effects that the adsorbing material prepared from the raw materials by adopting the technology has the advantages of high molecular sieve content, high strength, high specific surface area, high adsorption and desorption ratio, low specific heat capacity, low wind resistance and the like, and solves the problems that a traditional molecular sieve adsorbing material is low in adsorption efficiency, low in strength, poorin thermal stability, short in usage period and the like.

The invention discloses a hydrocracking method, which comprises the following steps: (1) a diesel oil feedstock is mixed with hydrogen gas and then enters a hydrorefining reactor to carry out desulfurization, denitrification and aromatic saturation reaction; (2) the effluent from step (1) enters a hydrocracking reactor, wherein the hydrocracking reactor comprises at least two catalyst beds, wherein the molecular sieve content of the hydrocracking catalyst containing the modified Y molecular sieve in each catalyst bed increases progressively along the flow direction, and the average pore diameter of the catalyst decreases progressively; (3) the effluent of the hydrocracking reactor is separated into a gas phase and a liquid phase, the gas phase is recycled, the liquid phase enters a fractionation tower, and the fractionating products are obtained and comprise naphtha, aviation fuel, diesel oil and tail oil. The method takes diesel oil as a feedstock and increases the production of high-aromatic latent heavy naphtha through reasonable combination of different functional hydrocracking catalysts, thereby improving the quality of aviation fuel and diesel oil products.

The invention discloses glass fiber framework molecular sieve paper with a porous structure. The paper is prepared from, by mass, 70-80% of molecular sieves, 5-15% of glass fibers and 5-15% of silicondioxide. The invention also discloses a preparation method of the glass fiber framework molecular sieve paper with the porous structure. In the prepared glass fiber framework molecular sieve paper with the porous structured, the content of the molecular sieves reaches 75% or above, the content of adsorption materials is high, and the adsorption capacity in unit volume is large. The porous structure in the paper can obviously increase the specific surface area of the glass fiber framework molecular sieve paper, increase the contact area between the paper and organic waste gas and the adsorption capacity, prolong the service life, reduce the pressure drop loss and adapt to different temperature and humidity environments.

The invention relates to a preparation method of an aluminum-free MFI structure spherical molecular sieve catalyst. The method includes the steps of: molding an aluminum-free MFI structure molecular sieve, then contacting the molded molecular sieve with an alkaline buffer solution of a nitrogen-containing compound. Specifically, the molding process of the aluminum-free MFI structure molecular sieve consists of: under the rotating operation conditions of a turntable molding machine, (1) placing a molecular sieve raw material of 200-500 meshes in the turnable molding machine to undergo mixing contact with water and/or a binder, thus obtaining spherical particles with a diameter of 0.1-1mm; (2) then adding a molecular sieve raw material of 100-1000 meshes and the binder to obtain a spherical catalyst with a diameter of 1.5-2.5mm; and (3) drying and roasting the spherical catalyst. The spherical molecular sieve catalyst prepared by the method has a high molecular sieve content, crushing strength of 1.5-5.0kg/particle, and can satisfy the technological requirements of fixed-bed and moving-bed reactors.

The invention discloses a hydrocracking method, which comprises the following steps: (1) mixing a diesel oil raw material and hydrogen, feeding the mixture into a hydrofining reactor, and carrying outa desulfurization, denitrification and aromatic hydrocarbon saturation reaction; and (2) feeding the effluent obtained in the step (1) into a hydrocracking reactor, wherein the hydrocracking reactorcomprises first to nth catalyst bed layers in a material direction, n is greater than or equal to 3, preferably n is 3 or 4, the first to (n-1)th catalyst bed layers are filled with a hydrocracking catalyst containing a modified Y molecular sieve, and the nth catalyst bed layer is filled with a hydroisomerization catalyst containing a beta or ZSM molecular sieve and other molecular sieves with strong isomerization performance. According to the method, diesel oil is used as a raw material, and through reasonable combination of hydrocracking catalysts with different functions, the yield of heavynaphtha with high aromatic potential is increased, and the low-temperature fluidity of aviation kerosene and diesel oil products is improved.