31results about How to "High isomer selectivity" patented technology

The invention provides a catalyst used for isomeric pour point depression of middle distillate in F-T synthesis and a special core-shell structure composite molecular sieve of the catalyst. The composite molecular sieve takes a microporous ZSM-22 molecular sieve as a core and takes a mesoporous MCM-41 molecular sieve as a shell, wherein a relative proportion of the microporous ZSM-22 molecular sieve to the mesoporous MCM-41 molecular sieve is adjustable. A preparation method for the composite molecular sieve comprises the steps of: firstly, preparing the ZSM-22 molecular sieve; then, adding alkaline and an organic template agent into a mixed system containing the ZSM-22 molecular sieve for pre-crystallization; and regulating the pH value to 6.5-13.5, and carrying out crystallization treatment, thereby obtaining the composite molecular sieve. The catalyst, which is prepared by taking the core-shell structure ZSM-22 / MCM-41 composite molecular sieve as a carrier, is applied to hydroisomerization reaction of the middle distillate in F-T synthesis, and shows high isomeric selectivity; and especially, highly branched alkane selectivity is obviously improved. In the case that the conversion rate is 91.4%, the isomeric selectivity is kept to be higher than 90%, and the highly branched isomeric selectivity reaches 55.6%.

The invention relates the hydrogenation-cracking catalyst used to synthesize heavy wax, comprising 10.0-24.0wt% HY molecular screen, 10.0-24.0wt% SAPO-11 molecular screen, 3.0-10.0wt% nickel oxide, 3.0-10.0wt% nickel oxide, 0.0-15.0wt% molybdenum oxide or tungsten oxide, 10.0-24.0wt% amorphous oxide compound and 5.0-65.0wt% diaspore. The method comprises preparing carrier and dipping active component. The catalyst has the advantages of good catalytic cracking property, high diesel selective, and good isomerization property.

A kind of preparation method of 3,5,5-trimethyl-3-cyclohexene-1-ketone: with 3,5,5-trimethyl-2-cyclohexene-1-ketone (α-IP) As a raw material, the former nitrogen phosphatrane base is used as a catalyst, and reactive distillation technology is used to carry out isomerization reaction to prepare 3,5,5-trimethyl-3-cyclohexene-1-ketone (β-IP), product β The purity of ‑IP can reach 99.5wt%‑99.8wt%, and the reaction selectivity can reach 99.2%‑99.9%. The process has the advantages of less catalyst consumption, high selectivity, no alkali precipitation, less high boiling matter, etc., and is an efficient synthesis process.

The invention discloses a nano ZSM-22 zeolite-supported phosphorus-nickel hydroisomerization catalyst, a preparation method and an application. First prepare the nano ZSM-22 zeolite containing mesoporous structure, then the nano-ZSM-22 zeolite carrier is acid-treated by dilute nitric acid or Mg, so that the treated ZSM-22-De has only a certain amount of weak acid centers and no strong acid centers, and then The ZSM-22-De carrier is impregnated with phosphorus and nickel-containing inorganic salts, and the loading amount of Ni metal in the catalyst is 0.5-3.0wt%, preferably 1.0wt%, to obtain a hydroisomerization catalyst. The catalyst has high activity and high isomerization selectivity, and when the prepared catalyst is used in the hydroisomerization reaction of long-chain n-dodecane, the catalyst presents a relatively high yield of monosubstituted isomers.

The invention discloses a synthetic process of 3,5,5-trimethyl-3- cyclohexene-1-ketone. The synthetic process is characterized by comprising the following steps: by taking 3,5,5-trimethyl-2- cyclohexene-1-ketone (alpha-IP) as a raw material and taking a basic ionic liquid as a catalyst and adopting a reactive distillation technology, performing isomerization reaction to prepare 3,5,5-trimethyl-3-cyclohexene-1-ketone (alpha-IP), wherein the reaction absolute pressure is 0.2-2Bar, the reaction temperature is 150-230 DEG C, the purity of the product beta-IP can reach 99.5wt%-99.8wt%, and the reaction selectivity can reach 99.2%-99.9%. The process has the advantages of high selectivity, no alkali separation, easy catalyst recycling, and the like, and is an environment-friendly synthetic process.

The present disclosure provides a preparation method of a hydrodewaxing catalyst, the catalyst prepared by the method and the application of the catalyst, the method comprising: a. carrying out a molecular sieve-inorganic oxide carrier with a solution containing a hydrogenation active metal salt The first impregnation followed by drying, calcining and reduction to obtain a supported catalyst; wherein, the molecular sieve is a molecular sieve with a one-dimensional elliptical pore structure, and the minor axis of the one-dimensional elliptical pore structure is the The long axis is b. The supported catalyst obtained in step a is impregnated with an aqueous solution of a nitrogen-containing compound for a second time and dried to obtain a hydrodewaxing catalyst. Applying the catalyst prepared by the disclosed method to the hydrodewaxing process not only improves the selectivity of the catalyst, but also can more effectively reduce the pour point of the heavy lubricating oil base oil and maintain a higher yield of the target product .

The invention provides a low-cost method for synthesizing ZSM-48 molecular sieve with low silicon-aluminum ratio. The method utilizes double templates to synthesize low-silicon-aluminum ratio ZSM-48 molecular sieves at low cost. Compared with the existing method for preparing low-silicon-aluminum ratio ZSM-48 molecular sieves, the use of double templates reduces the cost of templates and shortens the time. Crystallization time, efficient synthesis of high-crystallinity low-silicon-alumina ratio pure phase ZSM-48 molecular sieves, and easier and more effective removal of templates, increased molecular sieve specific surface area, pore volume, pore size and acid content, and more effectively carried out Hydroisomerization reaction to improve isomerization selectivity. The molecular sieve has high application value and prospect in the field of hydroisomerization dewaxing.

The invention relates to a non-noble metal isomerization catalyst. The non-noble metal isomerization catalyst is composed of a ten-membered ring molecular sieve and raney nickel-loaded transition metal oxide with weight composition ratio of (0.2-5):1, preferentially, the weight composition ratio of transition metal oxide to raney nickel is (0.05-2):1. The non-noble metal isomerization catalyst is low in cost, is used for Fischer-Tropsch wax isomerization to prepare lubricating oil base oil, and has the advantages of good activity and high isomerism selectivity.

The invention relates to a method for producing lubricating oil base oil through isomerization dewaxing of high-waxy raw materials. The method firstly mixes a pretreatment solution with an isomerization dewaxing catalyst for pretreatment to obtain a pretreated isomerization dewaxing catalyst. Then put the pretreated isomerization dewaxing catalyst into the reactor for hydrogen activation, and finally contact the raw material oil and hydrogen with the activated isomerization dewaxing catalyst, and carry out the isomerization dewaxing reaction under a certain concentration of hydrogen sulfide atmosphere . The method of the invention improves the isomerization selectivity of the isomerization dewaxing catalyst and increases the yield of lubricating oil base oil by suppressing the cracking activity of the isomerization dewaxing catalyst at the initial reaction stage after hydrogen activation.

The invention relates to a method for preparing a catalyst for hydrogenation of fats and oils to prepare liquid fuels. The specific preparation steps are as follows: first, the roasted SAPO‑11 molecular sieve and the precursor of the amorphous oxide are mixed, extruded, shaped and roasted to form a carrier precursor; the monomer molecules of the polymer are filled in the carrier precursor Then carry out temperature rise treatment to obtain a carrier in which the acid sites of the molecular sieve are partially covered and the pores are partially blocked; the metal active component is loaded on the carrier, and the target catalyst is obtained after drying and reduction. Compared with the catalyst prepared in the prior art, the catalyst prepared by the method of the invention has higher isoparaffin selectivity and yield in the process of oil hydrogenation to liquid fuel.

The invention relates to a method for preparing a catalyst for hydrogenation of fats and oils to prepare liquid fuels. The specific preparation steps are as follows: first, the roasted ZSM‑22 molecular sieve is mixed with the precursor of the amorphous oxide, extruded, shaped and roasted to form a carrier precursor; the monomer molecules of the polymer are filled in the carrier precursor Then carry out temperature rise treatment to obtain a carrier in which the acid sites of the molecular sieve are partially covered and the pores are partially blocked; the metal active component is loaded on the carrier, and the target catalyst is obtained after drying and reduction. Compared with the catalyst prepared in the prior art, the catalyst prepared by the method of the invention has higher isoparaffin selectivity and yield in the process of oil hydrogenation to liquid fuel.

The invention relates to the field of molecular sieves, and discloses a method for preparing a surface aluminum-rich molecular sieve. The method prepares two molecular sieve precursor gels with different silicon-alumina ratios, and controls the crystallization conditions so that the two molecular sieve precursor gels are respectively subjected to the first step of crystallization. and mixing the first-step crystallization products according to a predetermined ratio to carry out the second-step crystallization to finally obtain a surface aluminum-rich molecular sieve. The obtained molecular sieve not only has high crystallinity, but also has effective acid centers concentrated on the outer surface, showing high catalytic activity and high catalytic selectivity in the isomerization catalytic reaction of long-chain alkanes.

The invention discloses a preparation method for a hydrodewaxing catalyst and a catalyst prepared by using the same, and an application of the catalyst. The method comprises the following steps: a, subjecting a molecular sieve-inorganic oxide carrier to first impregnation with an ammonium salt solution, and carrying out drying so as to obtain an impregnated carrier, wherein the ratio of ammonium salt to the molecular sieve-inorganic oxide carrier is 0.01 to 0.2 mol / 100 grams; b, mixing hydrogenation active metal salt with water so as to obtain a solution containing the hydrogenation active metal salt, and adjusting the pH value of the solution containing the hydrogenation active metal salt to 10.0 to 12.0 by adopting at least one selected from the group consisting of ammonia water, ammonium carbonate and urea so as to obtain an impregnating solution; and c, subjecting the impregnated carrier obtained in the step a to second impregnation with the impregnating solution obtained in the step b so as to obtain the hydrodewaxing catalyst. The catalyst prepared by using the method provided by the invention is applied in the process of hydrodewaxing, so the selectivity of the catalyst is improved; meanwhile, the pour point of heavy lubricant base oil can be effectively reduced; and a high target product yield is maintained.

The invention relates to a method for controlling high dispersion of active centers of a supported metal catalyst. The method belongs to the technical field of structural control of the active centers of the supported metal catalyst. The catalyst is formed by loading the active centers on hydrotalcite in-situ modified aluminium oxide and realizes control of a dispersion state of the metal active centers by using a lattice-inducing effect of hydrotalcite laminate on the metal active centers of platinum on the laminate. The method can increase a dispersion degree of the active centers and realizes a better catalytic effect.

The invention discloses a preparation method for a hydrodewaxing catalyst and a catalyst prepared by using the same, and an application of the catalyst. The method comprises the following steps: a, subjecting a molecular sieve-inorganic oxide carrier to first impregnation with a solution containing hydrogenation active metal salt, and successively carrying out drying, calcination and reduction so as to obtain a supported catalyst, wherein the molecular sieve is a molecular sieve with a one-dimensional elliptical pore structure, and the minor axis of the one-dimensional elliptic pore structure is 4.2-5.4 angstroms and the major axis of the one-dimensional elliptic pore structure is 5.4-7.0 angstroms; and b, subjecting the supported catalyst obtained in the step a to second impregnation with water, and carrying out drying so as to obtain the hydrodewaxing catalyst, wherein after the hydrodewaxing catalyst is subjected to calcination at 450 DEG C for 4 hours, the weight loss of the hydrodewaxing catalyst is 0.2 to 5.0 wt%. The catalyst prepared by using the method provided by the invention is applied in the process of hydrodewaxing, so the selectivity of the catalyst is improved; meanwhile, the pour point of heavy lubricant base oil can be effectively reduced; and a high target product yield is maintained.

The invention relates to a preparation method for a C5 and C6 alkane isomerization catalyst. The preparation method comprises the following steps: (1) mixing, kneading, extruding and forming mordenite, an inorganic binder, methylcellulose and a nitric acid solution, and performing drying and roasting to obtain a carrier; (2) soaking the carrier in the step (1) in hydrophobic organic amine-alcohol solution, and adding organic amine according to 20%-150% (a molar fraction) of total acid amount of the carrier detected by NH3-TPD, wherein the weight of a soaking solution is 1.2-3 times that of the carrier; (3) drying the soaked carrier, and controlling the drying temperature to be 0-100 DEG C before and after a low-temperature desorption peak detected by NH3-TPD; and (4) performing ion exchange on a VIII-family metal precursor for the carrier dried in step (3), and performing drying and roasting to obtain the catalyst. According to the catalyst prepared by the preparation method, noble metals are highly dispersed, and are uniformly distributed inside the catalyst; and the catalyst is used for C5 and C6 alkane isomerization reaction, so that a normal-alkane conversion rate is high and isomeric selectivity is good.

The invention discloses a preparation method of a loading type bimetallic catalyst with a highly-dispersing active center and belongs to the technical field of active center structure control of the loading type catalyst. In the catalyst, the active center is loaded on aluminium oxide modified in situ by hydrotalcite, and a trivalent additive metal is introduced into a hydrotalcite layer plate by utilizing the adjustable characteristic of metal cations of the hydrotalcite layer plate. When the hydrotalcite layer plate is topologically transformed into the layered bimetallic oxide in the process of roasting reduction, due to the confinement action of lattices of the hydrotalcite layer plate, the additive metal embedded into the hydrotalcite layer plate is controlled to grow in the process of roasting reduction. The control for the dispersing state of the active center of the metal is realized by the lattice induction action of the platinum at the active center of the metal on the layer plate by the hydrotalcite layer plate.