72results about How to "Delay inactivation" patented technology

The invention relates to a catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons and a preparation method thereof, mainly solving the problems in the prior art that the conversion level of polycyclic aromatic hydrocarbons is low, the monocyclic aromatic hydrocarbon yield and selectivity are low and the catalyst deactivation rate is high. The problems are better solved by adopting the catalyst and the preparation method thereof. The catalyst comprises 34.5-60wt% of mixture of FAU type zeolite and at least one molecular sieve from MOR, BEA, MFI and MCM-22, 39.5-65wt% of at least one of gamma-alumina, eta-alumina and pseudo-boehmite as a binder and 0.05-0.9wt% of at least one metal from Pt, Pd and Ir. The catalyst can be used in the industrial production of converting heavy polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons.

The present invention provides an alkane dehydrogenation sulfide catalyst, which comprises an active ingredient and a carrier, wherein the active ingredient comprises one or a plurality of elements selected from Fe, Co, Ni, Cu, Zn, Mo, W and Mn, the active ingredient content in the catalyst (calculated as the oxide having the highest valence) is 0.5-40 wt%, the carrier is a mixed oxide or a composite oxide formed from one or a plurality of materials selected from SiO2, Al2O3, ZrO2, La2O3, CeO2, CaO, P2O5, Nb2O5 and MgO, the carrier content is 60-99.5 wt%, and the active ingredient on the surface of the alkane dehydrogenation sulfide catalyst exists in a sulfide form. When the catalyst is adopted for the alkane dehydrogenation reaction, characteristics of high activity, high selectivity, good stability, slow deactivation, low cost and no environment pollution are provided.

The invention belongs to the technical field of catalysts, in particular to a preparation method of a catalyst for producing propylene by propane dehydrogenation under the carbon dioxide atmosphere and an application thereof. The preparation method can overcome the shortcomings of low activity, poor stability, high price and the like of the existing catalyst. An HZSM-5 zeolite with high silicon-aluminum ratio is taken as a carrier, zinc oxide is taken as an active component, the impregnation method in the prior art is adopted for preparing the catalyst, the prepration process is simple convenient, and the cost is low. When the catalyst is used for the reaction for producing the propylene by the propane dehydrogenation under the carbon dioxide atmosphere has the advantages of low price, simple process, high reaction activity, high yield of the propylene, good stability, slow inactivation and the like.

The invention pertains to the technical field of catalyst, particularly relating to a method for preparing propylene catalyst by propane dehydrogenation under carbon dioxide atmosphere and an application thereof. The catalysts currently used in the reaction have the disadvantages of low activity, poor stability, high price, etc. HZSM-5 ziolite is treated with high-temperature water vapor, and the ziolite is then taken as a carrier and zinc oxide is taken as an active ingredient to prepare catalyst by the impregnation method of the prior art. The catalyst is applied to the reaction for preparing propylene by propane dehydrogenation under carbon dioxide atmosphere, and the catalyst has the advantages of simple operation, high activity, sound stability, low cost, etc..

The invention relates to a silicoaluminophosphate molecular sieve and a preparation method and application thereof. The structure formula of the molecular sieve is (0.2-3.0) R: (Si0.01-0.3Al0.01-1P0.01-0.9 ):(10-400) H2O, and three templates, a silicon source, an aluminum source and a phosphorus source are mixed with water to form gel, and then the silicoaluminophosphate molecular sieve can be obtained by the steps of crystallization and drying. Compared with the preparation methods of the molecular sieve with single template and double templates in the prior art, the invention is taken as a catalyst and is applied to the reaction of light olefins from methanol, can improve the conversion rate of raw materials, delay coking rate, prolong reaction activity time, and improve the selectivities of ethylene and propylene, and simultaneously solve the problem that the synthesis cost of the silicoaluminophosphate molecular sieve is high in the prior art.

The invention relates to a method of producing dimethyl ether liquefied gas by methanol, directly inputting methanol steam to a reaction kettle with compound liquid catalyst, controlling producing temperature at 120-250 deg.C and pressure at 0.2-3.8 MPa, making it pass through a buffer, a condensing tower, a gas-liquid separator, and then input it to liquid gas storage tanks by a compressor, and obtaining the products. It can use 72%-99.9% methanol as raw material, the producing temperature is easy to control, the heat conduction is fast, and the reactor is uniformly used; it uses liquid catalyst, the catalyst is inactivated slowly and easy to make and able to repeatedly use, the corrosion to the device is low, and it can implement continuous production, and make the dimethyl ether products with purity 90-99%.

The present invention relates to a methanol-to-aromatic hydrocarbon catalyst and uses thereof. A purpose of the present invention is mainly to solve the problems of low selectivity and poor catalyst stability in the conversion of methanol into aromatic hydrocarbons in the prior art. The technical scheme of the present invention comprises that a modified mesoporous and microporous compounded molecular sieve is adopted as a catalyst, methanol is adopted as a raw material, and the raw material is subjected to an aromatization reaction at a reaction temperature of 360-500 DEG C under a reaction pressure of 0-1.0 MPa at a raw material mass space velocity of 0.4-8 h<-1> under the effect of the catalyst. With the technical scheme, the problems in the prior art are well solved. The catalyst of the present invention can be used for the industrial production of methanol-to-aromatic hydrocarbon.

The invention discloses an alloy catalyst for dehydrogenation of alkane as well as a preparation method and an application of the alloy catalyst. The catalyst comprises three components A, B and C, wherein the component A is one of noble metal element precursors Pt, Pd, Rh and Ir and accounts for 0.1wt%-5wt% of total weight of the catalyst; the component B is one of precursors Sn, Ge and Ga and accounts for 0.1wt%-5wt% of total weight of the catalyst; the component C is a carrier and accounts for 90wt%-99.8wt% of total weight of the catalyst. The metal organic compound is used as a precursor of the component B, and the precursor is very likely to be uniformly dispersed on the surface of the carrier. Then, the active component A is introduced, and finally the alloy catalyst is prepared. Theprepared catalyst has the advantages of small particle size, high dispersibility, high sintering resistance, high catalytic activity and good dehydrogenation performance of light alkane.

The invention discloses a method for synthesizing propylene by using methanol, for solving the problems that in the existing technique for preparing propylene by using methanol, the selectivity of propylene is low and cannot meet the requirement of industrial application and subsequent separation is very difficult. The method disclosed by the invention comprises the following steps of: preparing an intermediate mixture; synthesizing propylene; and separating propylene. According to the method for synthesizing propylene by using methanol, the raw material is a methanol aqueous solution. By the method disclosed by the invention, the problem that in the existing technique for preparing propylene by using methanol, the selectivity of propylene is low can be solved effectively, and therefore, the subsequent separation difficulty is reduced, the production cost is lowered and the economic efficiency of enterprises is improved.

A macroreticular cationic exchange resin is prepared from styrene or substituted styrene, divinylbenzene and atoleine through copolymerizing and sulfonating. It can be used to synthesize the catalyst for synthesizing diphenol A by ionic exchange. Said catalyst has high activity and selectivity and long service life.

The invention provides a synthesis method of 3-methyl-2-butene-1-aldehyde diisopentenyl acetal. The synthesis method comprises the following step: in the presence of a supported catalyst, carrying outan alcohol-aldehyde condensation reaction on isopentenal and isopentenol to realize high-activity high-selectivity synthesis of the 3-methyl-2-butene-1-aldehyde diisopentenyl acetal. The catalyst provided by the invention improves the activity of reactants and the selectivity of the product, can obtain high yield, avoids the problem of equipment corrosion, prolongs the service life of equipment,has obvious environmental protection benefits, is environment-friendly, and is beneficial to industrial mass production.

The invention relates to the field of preparation of molecular sieves and particularly relates to modified IM-5 molecular sieves, a preparation method therefor, an application of the modified IM-5 molecular sieves and an alkylation reaction method for toluene and methanol. The preparation method for the modified IM-5 molecular sieves comprises the steps of subjecting a modifier solution to contactwith H-IM-5 molecular sieves, and then, roasting a solid material obtained through contact, wherein the modifier solution contains quaternary ammonium cations, quaternary phosphonium cations and at least one lanthanide metal compound and is alkaline, and the contact temperature is 70 DEG C to 200 DEG C. According to the modified IM-5 molecular sieves provided by the invention, on the basis of overall weight of the modified IM-5 molecular sieves, by oxides, the phosphorus content is 0.1wt% to 15wt%, and the content of lanthanide metal element is 0.1wt% to 20wt%. By applying the modified IM-5 molecular sieves provided by the invention to an alkylation reaction for the toluene and the methanol, the modified IM-5 molecular sieves have the advantages that the deactivation rate is low, the catalytic activity is high, and the selectivity of dimethylbenzene and trimethylbenzene is good.

The invention specifically provides an alkylation method, belonging to the field of alkylation. The alkylation method comprises a step of allowing benzene to contact with methanol in the presence of a catalyst containing a modified IM-5 molecular sieve, wherein the modified IM-5 molecular sieve has a mesoporous area of 150 m<2>/g or above and a mesoporous volume of 0.5 cm<3>/g or above. The catalyst used in the invention has the advantages of slow inactivation rate, high catalytic activity and good selectivity; e.g., when the catalyst is used under a high space velocity condition, activity stability of the catalyst is still long, and the catalyst still has a high benzene conversion rate in a reaction at low temperature. Due to the advantages of the catalyst, the alkylation reaction of benzene with methanol has the advantages of high benzene conversion rate, good selectivity of target products, i.e., xylene and 1,2,4-trimethylbenzene, etc.; and since the catalyst is not prone to inactivation, the alkylation reaction has a long operation period and is especially suitable for industrial application.

The invention relates to a fluidized catalytic method of p-xylene by methylation of aromatic hydrocarbon, and mainly solves the problems of high temperature rise of a reaction bed, poor catalyst stability, more side reaction of an alkylation reagent and low utilization rate in the prior art. According to the technical scheme, dimethyl ether and aromatic hydrocarbon are used as mixing feeds and dimethyl ether is used as the methylation reagent. The technical scheme greatly solves the problems and can be applied in the industrial production of p-xylene by methylation reaction of aromatic hydrocarbon.