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

The present invention relates to preparation of a wearing-resistant catalyst, which comprises the following steps: (1) preparing slurry which comprises molecular sieve, binding agent, additive and dispersing agent; (2) mixing each component of the slurry to uniform and reducing particle rate through mixing and grinding; and (3) converting the slurry to formed particles through a forming step; and (4) drying or calcining the formed catalyst; wherein LOI (cutting down) value of the catalyst after drying or calcining is smaller than 8. The invention firstly describes a fact that LOI value reduction of the catalyst can reduce catalyst wearing. In the preparation process, the LOI of the catalyst is reduced so that the prepared catalyst has lower wearing rate. The wearing rate of FCC catalyst is reduced from best 2.5% / hr previously to 0.3% / hr.

The invention relates to a method for preparing low-carbon olefin through methanol dehydration, and mainly solves the problems that the activity of a catalyst and the yield of the low-carbon olefin are low in the conventional technology for preparing the low-carbon olefin through catalytic pyrolysis. In the invention, methanol which is taken as a raw material is contacted with an adhesive-free molecular sieve catalyst through a catalyst bed to generate the low-carbon olefin under the conditions that the reaction temperature is 400 to 600 DEG C, the gauge pressure of the reaction is 0.001 to 0.5MPa, the weight space velocity of the reaction is 0.1 to 4h<-1> and the weight ratio of water to methanol is (0.1-3):1, wherein the pore volume, the average aperture and porosity of the adhesive-free molecular sieve catalyst are tested by mercury porosimetry, the pore volume is 0.31 to 0.5ml / g, the average aperture is 71 to 100nm, and the porosity is 31 to 40 percent. Through the technical scheme, the problems are better solved. The method can be used for the industrial production of the low-carbon olefin through methanol dehydration.

The invention provides a method for synthesizing NaA-type molecular sieve materials from catalytic cracking waste catalysts, using catalytic cracking waste catalysts as raw materials, adding sodium carbonate and sodium silicate, and roasting at high temperature to obtain a solid solution; Hydrothermal crystallization, filter the hydrothermal crystallization product, add the filter material to a certain concentration of sodium hydroxide solution, stir for a period of time, then add a certain amount of sodium aluminate powder, fully stir and leave to age; Stir the aged mixture at a certain temperature, centrifuge the reaction product, rinse with deionized water, and dry to obtain NaA molecular sieve material. The composition of raw and auxiliary materials is simple, the reaction conditions are moderate, and the cost is low. The prepared NaA molecular sieve has a high content of materials and has a good solidification and stabilization effect on heavy metals such as nickel, and realizes resource utilization while harmlessly treating waste catalysts.

A preparation method and application of a mixed matrix membrane with a thermoplastic elastomer as a matrix. An unconventional solvent (acid) is used to configure a casting liquid, and the mixed matrix membrane is prepared by casting. When the molecular sieve content reaches a certain level, a layered structure similar to a composite membrane is formed, and the selectivity remains unchanged when the permeation flux is greatly increased, overcoming the traditional compromise relationship between permeability / selectivity . The process of the method is simple and convenient, and the obtained membrane can be used for gas separation, especially CO2 / light gas (N2, CH4, H2, O2) separation.

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 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) 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 relates to the field of molecular sieve adsorbents, and specifically discloses a 5A molecular sieve adsorbent and its preparation method and application. The 5A molecular sieve adsorbent of the present invention, based on the dry weight of the adsorbent, has a content of 5A molecular sieve in the adsorbent. 92% by weight or more, the crushing rate of the adsorbent at 250N is below 6.9%, and the n-pentadecane adsorption capacity of the adsorbent is above 103 mg / g. The 5A molecular sieve adsorbent provided by the invention has high molecular sieve content, good strength and large adsorption capacity, and is especially suitable for the adsorption of n-pentadecane.