98results about How to "Raw material conversion rate is high" patented technology

The invention discloses a molecular sieve catalyst for preparing propylene by propane dehydrogenation and a preparation method of the molecular sieve catalyst, and belongs to the field of preparationof catalysts. The catalyst consists of a component A and a component B, wherein the component A is one of metal elements Sn, Ga, Fe, Co, Ni or Zn, the use amount of the component A is 1-9wt% of the total amount of the catalyst, the component B is a molecular sieve carrier, and the use amount of the component B is 90-99wt% of the total amount of the catalyst. The preparation method of the catalystcomprises a direct hydrothermal synthesis method and an impregnation method. The high-performance alkane dehydrogenation catalyst is prepared by controlling the use amounts, the structures and the dispersity of active components, has the characteristics of simple preparation process, low price and no toxicity, and has the characteristics of good activity, high selectivity, high stability and the like when applied to preparation of propylene through propane dehydrogenation; and a new technical scheme is provided for development and preparation of a new-generation alkane dehydrogenation catalyst.

The invention relates to a catalyst and a method for preparing ethanol by hydrogenating acetic ester and mainly solves the problems that in the prior art, the ratio of hydrogen to ester is too high, the conversion rate of raw materials is low and the selectivity of ethanol is poor. The catalyst is composed of the following components in parts by weight: (a) 5-80 part of metallic copper or copper oxide, (b) 0.05-60 parts of catalyst promoter and (c) 5-90 parts of silicon dioxide carrier, wherein the catalyst promoter is selected from at least one of transitional metal or oxide of the transitional metal; the specific area of the catalyst is 150-500 m<2> per gram; the total pore volume is 0.1-3.0 ml/gram; the pore volume of the diameter less than 20nm is 40-90% of the total pore volume; the pore volume of the diameter less than 50nm and larger than 20nm is 5-75% of the total pore volume; and the pore volume of the diameter larger than 50nm is 5-75% of the total pore volume. By adopting the technical scheme, the problems are well solved; and the catalyst can be used for industrial production of ethanol by hydrogenating acetic ester.

The invention relates to a catalyst and method for preparing 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate. The catalyst comprises, by weight, a) 20 to 50 parts of metallic copper or an oxide thereof, b) 30 to 60 parts of metal zinc or an oxide thereof, c) 1 to 20 parts of at least one transition metal or its oxide, and d) 1 to 20 parts of alumina. The desired alumina precursor has a specific surface area of 50 to 500m<2>/g and a total pore volume of 0.3 to 2.0ml/g. The volume of pores having diameters less than 20nm is 40-80% total pore volume. The volume of pores having diameters of 20-90nm is 10-40% total pore volume. The volume of pores having diameters greater than 90nm is 0-16% total pore volume. The catalyst can be used in the industrial production of 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate.

The invention discloses a device and method for producing clean gasoline by combining catalytic cracking and hydrofining. The device comprises a reaction-regeneration system, a fractionating system, an absorption stable system and a hydrofining unit. The method comprises the following steps: adding a gasoline fractionating tower to the top of a catalytic cracking fractionating tower to divide crude gasoline into a light fraction and a heavy fraction, wherein the heavy fraction gasoline enters the hydrofining unit for selective hydrogenation desulfurization, and one part of the light fraction gasoline enters the absorption stable system to obtain stable light gasoline, and the other part of the light fraction gasoline directly returns to a reaction area at the upper part of a catalytic cracking second riser reactor to be modified under a mild condition; and blending the stable light gasoline and the modified heavy gasoline to obtain the product of clean gasoline. By adopting the method, the catalytic cracking gasoline is efficiently modified, and the catalyst-oil ratio of a catalytic cracking device can be increased to promote the conversion of heavy petroleum hydrocarbon; and meanwhile, the load and energy consumption of the absorption stable system are reduced, the synergistic effect between the two devices of catalytic cracking and hydrofining is enhanced, and the processing cost is lowered.

The invention discloses a method for preparing 19-demthyl-4-androstenedione, which comprises the steps of: based on estrone as a raw material, sequentially carrying out etherealization reaction, ketalation, Birch reducing reaction and hydrolysis reaction to obtain19-demethyl-4-androstenedione, wherein the reaction formula is shown in the specification. According to the method provided by the invention, the traditional phenolic group methyl etherealization process is improved, methyl carbonate replaces traditional high-toxicity carcinogenic etherealization reagents dimethyl sulfate and iodomethane, and inexpensive potassium carbonate is used as a base, so that the production cost is lowered, the method is environment-friendly, the yield is high, and the method is suitable for scaled industrial production.

The invention discloses a method of producing a gasoline blending component with a high octane value by a light aromatic hydrocarbon and/or alcohol/ether compound. The method comprises the following steps: enabling raw material light aromatic hydrocarbon to enter a reactor from the top of a reactor, dividing alcohol/ether oxygenated compounds into a plurality of paths, enabling each path to enter each reaction bed layer of a multi-section quench type fixed bed reactor and then mix with the light aromatic hydrocarbon entering from the top of the reactor to react on a special catalyst to produce an alkyl-rich aromatic hydrocarbon gasoline blending component with the high octane value. The method disclosed by the invention has characteristics of a high raw material conversion ratio, good catalyst stability, a high gasoline product octane value, a simple process, low energy consumption, strong flexibility in operation scheme, and the like, and can be used for effectively promoting the light aromatic hydrogen and the alcohol/ether oxygenated compounds to efficiently convert to the gasoline blending component with the high octane value.

The invention discloses a chemical reaction device, which comprises a reaction unit, a separation unit and a recovery unit, wherein the reaction unit, the separation unit and the recovery unit are sequentially connected; the reaction unit comprises a three-phase bubble bed synthesis reactor. The invention also discloses a reaction device and method for preparing methyl methacrylate. The device provided by the invention is used for preparing the methyl methacrylate, and has the advantages that the raw material conversion rate is high; the target product yield is high; the selectivity of the methyl methacrylate is high.

The invention relates to a method for preparing BTX and co-producing tetramethylbenzene from C9<+> heavy aromatic hydrocarbons. The method comprises: carrying out catalytic cracking conversion on C9<+> heavy aromatic hydrocarbons to obtain a first-stage hydrocarbon mixing product using BTX and trimethylbenzene as main components, and separating respectively with an ethane removing tower, a butane removing tower, a hexane removing tower, a BTX removing tower and a trimethylbenzene removing tower to obtain dry gas, liquefied gas, C5-C6 non-aromatic hydrocarbons, BTX, trimethylbenzene and C10<+> heavy aromatic hydrocarbons, wherein the dry gas, the liquefied gas, the C5-C6 non-aromatic hydrocarbons and the BTX are adopted as products; carrying out a reaction on the trimethylbenzene and a certain amount of methanol to obtain a tetramethylbenzene-rich second-stage mixing product, and separating the products to obtain dry gas, wastewater and liquid-state hydrocarbons, wherein the liquid-state hydrocarbon products return to the ethane removing tower so as to be separated; and carrying out crystallization separation on the C10<+> heavy aromatic hydrocarbons to obtain tetramethylbenzene and a heavy component residue liquid, wherein the tetramethylbenzene and the part of the heavy component residue liquid are adopted as the product, and the remaining heavy component residue liquid return to a catalytic cracking reactor. According to the present invention, with the method, the moving bed non-hydrogen cracking and the tetramethylbenzene preparation using trimethylbenzene alkylation are compounded, such that the BTX is produced at a maximum while the high added value tetramethylbenzene can be co-produced.

The invention discloses a catalyst for vinyl toluene production and a preparation method thereof. The catalyst is prepared from the following components in parts by weight: 6-10 parts of vanadium modified molecular sieve, 60-75 parts of iron oxide, 14-15 parts of magnesium oxide and 5-15 parts of an adhesive. The preparation method of the catalyst comprises the following steps: firstly performing synthesis and crystallization in a high-pressure reactor to obtain the vanadium modified molecular sieve; secondly, performing ultrasonic dispersion on the vanadium modified molecular sieve raw powder, ferric salt and magnesium salt; then adding the adhesive, kneading and performing extrusion forming on the mixture, and finally, roasting the mixture, thereby obtaining a iron-magnesium-vanadium loaded molecular sieve catalyst. When applied to production of vinyl toluene by dehydrogenizing methyl-ethylbenezene, the prepared catalyst has the advantages of high raw material conversion rate, good product selectivity, low energy consumption, capability of inhibiting carbon deposition on the surface of the catalyst, and the like.

The invention belongs to the technical field of catalysts, and particularly relates to a single-phase composite metal oxide catalyst as well as a preparation method and application thereof. The catalyst provided by the invention shows a very high raw material conversion rate and high product selectivity in the reaction of preparing methacrolein by selective oxidation of isobutene; compared with existing heterogeneous composite metal oxide catalysts, the prepared single-phase catalyst can effectively reduce the barrier between the active sites required to be overcome by the component transfer,can accelerate the electron transfer rate, improve the oxidation reduction ability of the catalyst, and reduce the surface acidity so as to improve the isobutene conversion rate and the yield of the target product methacrolein, and is expected to be industrially applied.

The invention discloses an impinging-stream-based continuous magnesium hydroxide production process, and relates to a magnesium hydroxide production process. The process comprises the steps that a magnesium salt and precipitant with certain concentration serve as raw materials, an impinging stream reactor is adopted, in the impinging stream reactor, the magnesium salt and the precipitant react at20-90 DEG C, magnesium hydroxide precipitates are generated, the obtained precipitates are aged at 50-120 DEG C for 1-10 hours, then filtering and drying are conducted, and a magnesium hydroxide product is finally obtained. Auxiliary equipment of the process comprises a raw material storage tank, a pump, a flowmeter, a filter, an ageing tank, a dryer and the like. Accordingly, the impinging streamreactor is adopted, the magnesium salt and the precipitant serve as the raw materials, and the magnesium hydroxide product which is high in dispersion, small in specific surface area, uniform in particle size and consistent in crystal form can be obtained. By means of the continuous magnesium hydroxide production process, the materials are mixed rapidly, the reaction is efficient, and residence time distribution is narrow. The process flow is short, the equipment is less, and the product quality is good and stable.

The invention discloses a methanation reactor and a methanation technology. The methanation reactor comprises a shell, a gas inlet tube, a cylinder, a gas outlet tube and a micro-reaction channels, and a catalytic active component can be loaded in the micro-reaction channels. Compared with methanation reactors in the prior art, the methanation reactor disclosed in the invention has the advantages of small use amount of a catalyst, low bed pressure drop, short gas retention time, high reaction bed space utilization rate, no gas flow deflection and no short circuit in the methanation reaction process.

The invention relates to a catalyst, a preparation method thereof and a method for preparing lower olefin from synthesis gas. The catalyst comprises a carrier and an active component, the carrier contains a manganese oxide molecular sieve OMS-2, and the active component is one or more selected from metal components of group VIII metals. Compared with catalysts in the prior art, the catalyst has improved catalytic activity, and can enable a relatively high raw material conversion rate and target product selectivity at a high space velocity when the catalyst is used for preparing the lower olefin from the synthesis gas.