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.

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.