48results about How to "Secondary hole" patented technology

The invention relates to a composite molecular sieve-containing medium oil type hydrocracking catalyst, which comprises an active component and a binder, wherein the active component adopts amorphous SiO2-Al2O3 as a carrier, adopts a composite molecular sieve as an acid component, and adopts a group VIB metal and a group VIII metal as hydrogenation activity components, and the composite molecular sieve comprises a Y molecular sieve and a ZSM-23 molecular sieve. According to the present invention, the deep dealuminzation modified Y molecular sieve has characteristics of high crystallinity, large surface area, high silica-alumina ratio, low cell constant, rich secondary pore, low acid center density, high moderate-intensity acid center ratio, and the like; the modified ZSM-23 molecular sieve has characteristics of smooth pore channel, less acid center and outstanding isomerism performance, wherein a light naphtha component is isomerized so as to increase an octane number of naphtha; the composite molecular sieve compounded from the Y molecular sieve and the ZSM-23 molecular sieve is adopted as the acid cracking component so as to provide advantages of the Y molecular sieve and the ZSM-23 molecular sieve, and compounding is performed according to the ratio of the present invention, such that the best catalysis effect can be obtained, and the obtained catalyst is suitable for the medium oil type hydrocracking catalyst; and the catalyst prepared from the composite molecular sieve has characteristics of excellent medium oil selectivity, good activity and good stability.

The invention relates to a method for hydrogenating naphthenic base distillate to produce lubricating oil basic oil. The naphthenic distillate is used as raw material and a one-stage in series hydrogenation process of hydrotreating-hydrodewaxing-hydrofinishing is adopted to produce the lubricating oil basic oil. Ordinary hydrotreating catalysts are filled in the upper part of a hydrotreating reaction area, and hydrotreating catalysts containing modified zeolites are filled in the lower part of the hydrotreating reaction area. The hydrodewaxing and hydrofinishing reaction areas are the same as those of the prior art, and are filled with hydrodewaxing catalysts and hydrofinishing catalysts. Compared with the prior art, the method disclosed by the invention has the advantages that system energy consumption is reduced, the pour point of a product is properly reduced, and the stability of the product is effectively improved.

The invention discloses a hydrogenation dearomatization catalyst and a preparation method thereof. The catalyst comprises a main active component Pt, an auxiliary component Pd and a carrier prepared from a small-grain Y type molecular sieve, alumina and amorphous silicon aluminum. According to the preparation method, the small-grain Y type molecular sieve with the characteristics of great dealumination depth, good crystallinity retentivity and well-developed secondary pores is used as an acid component and cooperates with the amorphous silicon aluminum, the main active component and the auxiliary component, so the hydrogenation dearomatization catalyst has higher hydrogenation dearomatization activity and is especially applicable to hydrogenation dearomatization and decoloring of heavy aromatic-containing naphthenic high-viscosity white oil and solvent naphtha.

The invention discloses a small-grain Y type molecular sieve and a preparation method thereof. The small-grain Y type molecular sieve has the following properties: the mol ratio of SiO2 / A12O3 is more than 10 and less than 40; average grain diameter is 200 to 700 nm; relative crystallinity is above 100%; lattice constant is 2.430 to 2.450 nm; specific surface area is 850 to 1000 m2 / g; pore volume is 0.50 to 0.80 mL / g; the pore volume of secondary pores with a diameter of 1.7 to 10 nm is more than 50% of the total pore volume; and Na2O content is no more than 0.15 wt%. According to the preparation method, an NaY molecular sieve with a high Si / Al ratio, high crystallinity and good stability is used as a raw material, and caustic washing, ammonium exchange, hydrothermal treatment and treatment with a mixed solution of acid and ammonium salt are successively carried out so as to obtain the small-grain Y type molecular sieve. The small-grain Y type molecular sieve prepared in the invention is applicable as a cracking component of a light oil type hydrocracking catalyst and enables the catalyst to have good activity, heavy naphtha selectivity and excellent product nature.

The invention discloses a preparation method for a small-grain Y type molecular sieve. According to the method, a NaY type molecular sieve raw material with a high silica-alumina ratio, a high degree of crystallization and good stability is employed and successively undergoes ammonium exchange, primary hydro-thermal treatment, treatment with an alkali-containing solution, secondary hydro-thermal treatment and treatment with a mixed solution of acid and an ammonium salt; and the obtained small-grain Y type molecular sieve has a high SiO2 / Al2O3 mol ratio and a high proportion of secondary pores, retains the stability of a Y type molecular sieve and has a high specific surface area and a high degree of crystallization. The small-grain Y type molecular sieve prepared in the invention is applicable as a cracking component for a hydrocracking catalyst used for high and medium oil and enables the hydrocracking catalyst to have good activity, medium oil selectivity and product properties.

A silica-alumina carrier containing two kinds of modified molecular sieves, including modified Y molecular sieve, modified ZSM-23 molecular sieve and amorphous silica-alumina, the modified Y molecular sieve used in the inventive carrier is deeply dealuminated Y molecular sieve with complete crystal form, High silicon-aluminum ratio, low acid center density, high proportion of medium-strong acid, abundant secondary pores, suitable for use as acidic cracking component of medium oil hydrocracking catalyst, high specific surface area and developed secondary pores of molecular sieves not only facilitate the process of hydrocracking The hydrogen activity is exerted, and it is beneficial to the diffusion of reaction products. The secondary pores are many, and the acid center density is low, which reduces the probability of excessive cracking and secondary cracking, so that the catalyst has excellent medium oil selectivity and high silicon-aluminum ratio. , the unit cell constant is small and the structure is stable, so the catalyst has good stability.

The invention discloses a high-crystallinity modified Y-zeolite with cell parameter at 2.425-2.435nm, relative crystallinity not less than 95% and specific surface area at 800-950m2 / g, which is characterized by the following: adopting NaY zeolite as raw material to do amino exchange through ammonium salt solution; controlling the exchanging degree not less than 80%; placing in the water heat disposing furnace under 400-700 deg.c at 0.05-0.5Mpa for 1.0-5.0h; contacting the zeolite sample and ammonium salt solution; controlling the pH value; exchanging Na+ in the zeolite further; stripping non-frame aluminium selectively; proceeding secondary water heat disposal; setting the molar rate of SiO2 / Al2O3 at 15-16; obtaining the product.

The invention discloses a carrier and an application thereof. The carrier contains an aluminum-removal Y-type molecular sieve and a heatproof inorganic oxide. The invention also discloses a catalyst by employing the carrier and a preparation method and an application thereof. The invention further discloses a hydrocracking method of the catalyst. According to the molecular sieve in the carrier, the molecular sieve has high crystallization degree and abundant secondary pores, and has lower non-framework aluminum content. The catalyst is prepared by VIII metallic element and VIB metallic element loaded on the carrier, the catalyst displays better catalysis performance in a hydrocracking reaction, and can obtain good balance among catalytic activity, middle distillate selectivity and tail oil BMCI value.