122results about How to "Reduce carbon deposition rate" patented technology

The invention relates to a method for preparing aromatic hydrocarbon and cyclopentenone from biomass derivative gamma-valerolactone by catalytic conversion, which comprises the following steps: (1) using biomass derivative gamma-valerolactone as a raw material, which is prepared by carrying out hydrogenation reaction on levulinic acid; (2) introducing one or more transition metals into a zeolite molecular sieve, and preparing a reaction catalyst at the reaction temperature of 350-550 DEG C by using a fixed bed or fluid bed as a reactor; (3) in an inert or reducing atmosphere, carrying out contact reaction on the raw material gamma-valerolactone and catalyst under the reaction pressure of 0-10 MPa; and (4) after the pyrolysis gas is condensed, collecting the liquid product in the condensation receiver, thereby obtaining the aromatic hydrocarbon product (of benzene, toluene and xylene) and the cyclopentenone product. By using the renewable biomass derivative gamma-valerolactone as the raw material, the method has the advantage of milder reaction conditions, and the catalyst is simple to prepare and easy to recover and reuse.

The invention discloses a catalytic cracking coupling process for preparing low-carbon olefin and C<5+> hydrocarbon by using an organic oxygen-containing compound. The catalytic cracking coupling process comprises the following steps: converting the organic oxygen-containing compound into the low-carbon olefin under the effect of a catalyst in a reactor for preparing the low-carbon olefin by the organic oxygen-containing compound; in a catalyst regenerator, heating for oxidizing and decarbonizing a waste catalyst which enters the catalyst regenerator through a waste catalyst conveying pipeline from the reactor so as to regenerate a regenerated catalyst; conveying the regenerated catalyst back into the reactor by a regenerated catalyst conveying pipeline; introducing the C<5+> hydrocarbon into the regenerated catalyst conveying pipeline; under the catalytic effect of the catalyst, catalytically cracking the C<5+> hydrocarbon into the low-carbon olefin; and conveying the generated low-carbon olefin and the regenerated catalyst into the reactor by the regenerated catalyst conveying pipeline. According to the process disclosed by the invention, the high temperature of the regenerated catalyst is effectively utilized and the C<5+> hydrocarbon is cracked into the low-carbon olefin to form active hydrocarbon tank species, so as to shorten a reaction induction period, reduce the selectivity of converting the organic oxygen-containing compound into active carbon tank species and improve the yield of the low-carbon olefin.

The present invention relates to a preparation method of ethylene using the dehydration of ethanol, which is to solve the problem in the prior technology that: the reaction temperature is higher; the hollow speed is lower and the energy consumption is higher. The present invention uses ethanol as the raw material and water as the thinner; under the condition that the reaction temperature is 200- 400 Celsius system, the reaction pressure calculated by a pressure meter is 0-2MPa and the reaction weight hollow speed is 0.1-10 hours, the raw material is contacted with ZSM molecule screen catalyzer to produce a ethylene flow; thereinto the molar ratio between water and ethanol is 0-10: 1. The technical scheme can solve the problem greatly, which can be used in the industrial production of ethylene.

The invention discloses a hydrocarbon continuous liquid phase hydrogenation process method which includes a gas-liquid mixing step, to be more specific, a liquid phase material flow is fully mixed with hydrogen to obtain a dissolved-hydrogen-saturated liquid phase material flow by use of a gas-liquid mixer; and a hydrogenation reaction step, to be more specific, the dissolved-hydrogen-saturated liquid phase material flow flowing into a reactor flows in the direction of from the top of the reactor to the bottom of the reactor for liquid phase contact reaction with every stages of catalyst bed layers, and at the same time, new hydrogen is injected into the liquid phase material flow by a hydrogen distributor so as to realize the efficient hydrocarbon reaction of the liquid phase material flow. The present invention also discloses a hydrocarbon continuous liquid phase hydrogenation device which includes one gas-liquid mixer and one multiplestage reactor, the multiplestage reactor is connected with the gas-liquid mixer, each stage of the reactor comprises at least two stages of catalyst bed layers, and one hydrogen gas distributor is arranged between adjacent catalyst bed layers,.

The invention relates to a synthesis method of a low-silicon nano SAPO-34 molecular sieve, which comprises the following steps: sequentially mixing a silicon source, an aluminum source, a template agent R, deionized water and a phosphorus source to obtain a gel mixture; placing the gel mixture in a stainless steel high-pressure reaction kettle of which the liner is made of polytetrafluoroethylene, sealing, putting into a drying oven, and performing primary traditional hydrothermal crystallization; adding a dispersant agent S into the primary traditional hydrothermal crystallization solution, stirring for 0.5-4 hours, transferring into the reaction kettle of which the liner is made of polytetrafluoroethylene, sealing, putting into a microwave reactor, and performing secondary microwave hydrothermal crystallization; and washing, drying, and roasting to obtain the nano SAPO-34 molecular sieve. Compared with the prior art, the invention greatly lowers the crystallization temperature and shortens the time of the whole synthesis process. The nano molecular sieve can be widely used for conversion, separation and absorption of hydrocarbons, and especially has the advantages of high conversion rate, high low-carbon alkene selectivity, low carbon deposition rate, long reaction life and the like in the process of preparing alkene from methanol.

This invention relates to a preparation method for dimethyl ether by dehydrating methanol under liquid phase or gas-liquid mixing state in a catalytic distillation tower loaded with a solid acid catalyst in reaction section, wherein the methanol has a content of 5~99.99 wt.%. Catalytic distillation tower operating conditions include pressure of 0.6~5.0 MPa, column top temperature of 30~124DEG C, reaction section central temperature of 120~220DEG C, column reactor temperature of 160~270DEG C, the reflux ratio at 3~50, and feed volume space velocity of 0.1-10 ml methanol/ml catalyst, Or the reactions are carried out in one fixed bed rector or 2~4 fixed bed reactors in series with reaction conditions of temperature 120~220DEG C, pressure 0.6~8.0 MPa, and feed volume space velocity 0.1-10 ml methanol/ml catalyst.

The liquid hydrocarbon modifying catalyst consists of heat resisting inorganic oxide, Ir in 0.1-5.0 wt% of the inorganic oxide, and halogen in 0.01-3.0 wt% of the inorganic oxide. The catalyst is used in modifying naphtha product, and can raise benzene, toluene and xylene contents in the modified product, raise ethyl benzene converting rate, and lower the carbon deposit during the reaction process.

The present invention discloses a jet fuel production method, which comprises that (1) hydrogen gas, raw material oil and a hydrorefining catalyst are subjected to a contact reaction; (3) the effluent of the hydrorefining catalyst and a hydrocracking catalyst are directly subjected to a contact reaction, or after the gas phase stream is separated, a contact reaction is performed with a hydrocracking catalyst; (4) the effluent of the hydrocracking catalyst is separated to obtain a jet fuel and diesel oil; and (5) at least partial diesel oil and the raw material oil are mixed, or at least partial diesel oil and the feeding liquid of the hydrocracking catalyst are mixed, wherein the aromatic hydrocarbon content of the raw material oil is more than or equal to 40 wt%, the contact reaction condition of the step (1) makes the bicyclic aromatic hydrocarbon saturation rate in the raw material oil be 70-90%, and the contact reaction conditions of the step (3) makes the monocyclic aromatic hydrocarbon saturation rate in the feeding liquid of the step (3) be 75-95%. According to the present invention, the catalytic cracking diesel oil can be used as the raw material so as to achieve the high yield production of the high density jet fuel meeting the GJB1603 6# jet fuel standard.

Disclosed is a catalyst for reforming a tar-containing gas, wherein the catalyst contains at least one composite oxide as oxide containing nickel, magnesium, cerium and aluminum and the content of alumina as a single compound is limited to 5% by mass or less.

The present invention relates to an aromatic olefin-reducing catalyst mainly solving the problems of short carclazyte life, frequent replacement, large labor intensity, and serious environmental pollution when the carclazyte is used for removing trace olefins in an aromatic material in current industry. The aromatic olefin-reducing catalyst is used, the average pore diameter of the aromatic olefin-reducing catalyst is 5-30nm, the aromatic olefin-reducing catalyst comprises the following components by weight: 0 to 15% of lanthanide elements or a mixture thereof; 0 to 20% of oxides of one or more elements selected from Ca, Zn , Mg and Ti; and 30 to 90% of a molecular sieve, the molecular sieve is at least one selected from mordenite, Y zeolite, ZSM-5 molecular sieve, MCM-22 molecular sieve, MCM-56 molecular sieve, and beta-molecular sieve; and a carrier is one substance selected from alumina and silica or a mixture thereof, and by the technical scheme, the problem is preferably solved, and the method can be used for aromatic olefin-reducing industrial production.

A preparation method of a polymetallic reforming catalyst comprises the following steps: allowing platinum, tin and rare earth metal uniformly-supported small catalyst spheres to be in solid contact with rare earth metal salt powder, and roasting the obtained mixture in air or water-containing air to obtain a reforming catalyst with rare earth metals enriched in the shell area of the catalyst, wherein the average content of rare earth metals in the shell area is 2-5 times the average content of rare earth metals in a center area, the catalyst shell area is an area from the outer edge of the small catalyst sphere to the center and with the thickness of 150[mu]m, the solid phase supported catalyst comprises an alumina carrier, platinum accounting for 0.1-2.0% of the mass of the alumina carrier, tin accounting for 0.1-2.0% of the mass of the alumina carrier, rare earth metals accounting for 0.05-1.0% of the mass of the alumina carrier, and chlorine accounting for 0.5-5.0% of the mass of the alumina carrier. The catalyst prepared through the method has good activity and stability and low carbon depositing rate in reforming reactions.

The invention relates to a preparation method of a Pt-Sn reforming catalyst, which comprises an alumina carrier, and calculated on the basis of the alumina carrier, 0.1-1.0 mass% of platinum, 0.1-2.0 mass% of tin and 0.5-5.0 mass% of chlorine. The preparation method of the catalyst includes: making the dried tin-containing alumina carrier adsorb a proper amount of water, which accounts for 3-30% of the pore volume of the tin-containing alumina carrier in terms of volume at 25DEG C, then using platinum acetylacetonate-containing alkane of C7-C9 as an impregnation solution to impregnate the tin-containing alumina carrier with absorbed water, and then subjecting the impregnated solid to drying, water chlorine activation and reduction. The method can make metal platinum directionally loaded to large holes above certain aperture. The prepared catalyst has good activity and stability in the reforming reaction, and has a low carbon deposition rate.

The invention relates to a light hydrocarbon isomerization method. Isomerization reaction is performed for light hydrocarbon raw material in an isomerization reactor at the front part, gas-liquid separation is performed for the outlet stream of the reactor at the front part, the obtained liquid phase stream is separated in an isohexane removing tower, the overhead stream mainly comprising C5 cut fraction and dimethyl C6 alkane is mixed with the bottom stream mainly comprising C7 and cut fractions more than C7 so as to be used as isomate to enter into a gasoline stabilizer, the side stream mainly comprising C6 n-alkane and monomethyl C6 alkane is led into an isomerization reactor at the rear part; after the reaction stream of the isomerization reactor at the rear part is separated, the liquid phase stream all returns and is mixed with the liquid phase stream of a gas-liquid separator of the isomerization reactor at the front part so as to be used as the feeding of the isohexane removing tower. The method has higher n-alkane isomerization ratio and greatly improves the octane number of the light hydrocarbons raw material because the C6 n-alkane basically realizes the full isomerization.

The invention provides a method for lightening heavy aromatic hydrocarbon C9<+>; the method comprises that the heavy aromatic hydrocarbon C9<+> is lightened by contacting and taking react with catalysts under the hydrogen with the temperature of 380 to 600 DEG C and the pressure of 0.1 to 5.0MPa. The catalysts comprise high temperature resistance inorganic oxide carriers, and 0.01 to 3.0 percent of halogen and 0.01 to 5.0 percent of iridium by mass percentage by taking carriers as calculation standards. The method is used for lightening heavy aromatic hydrocarbon C9<+>, and is characterized by high light conversion, high yield of dimethyl benzene, little carbon deposition of catalysts and effectively reducing the end boiling point and gum content of the heavy aromatic hydrocarbon.

The invention discloses a naphtha reforming catalyst, and a preparation method thereof. The naphtha reforming catalyst comprises, by mass, 93.0 to 99.9 parts of a carrier, 0.1 to 2.0 parts of a metal, 0 to 5.0 parts of carbon, wherein the mass amount of carbon is higher than 0. According to the preparation method, a certain amount of a monosaccharide is added in preparation process of the Pt-KL reforming catalyst, so that metal Pt dispersion is improved, carbon deposition rate of the catalyst in reaction process is reduced, and Pt-KL catalyst reforming reaction performance is improved; the naphtha reforming catalyst possesses relatively high paraffin aromatization reaction activity and reforming liquid yield; when active metal component Pt is introduced in the preparation method, a dipping liquid is alkaline, pH value is controlled to be 10 to 13, adsorption effect of Pt precursor ion with carrier KL molecular sieve is improved, so that it is beneficial for dispersion of metal Pt.

The invention provides an anti-carbon-formation chromium-based catalyst for preparing propylene from propane through oxydehydrogenation, and a preparation method and application thereof, belonging tothe technical field of chemical catalysis. According to the invention, rod-like alumina originated from ZL201110196192.4 and rich in unsaturated ligand is used as a carrier; since the surface of the Al2O3 has a great number of hydroxyl unsaturated ligand Al<3+>, the active component Cr2O3 can be better anchored, strong interaction among the Cr2O3 and the Al2O3 is formed, agglomeration of the Cr2O3during a reaction is prevented, side reactions are inhibited, and propylene is prevented from carbon formation due to further dehydrogenation and polymerization; thus, the catalyst is allowed to maintain high propylene selectivity and is improved in stability. Therefore, the Al2O3 used as the carrier is helpful for improving the selectivity and inactivation resistance of the catalyst. Compared with conventional catalysts, the catalyst provided by the invention is high in propylene selectivity, slow in carbon formation and inactivation rates, high in stability and greatly improved in mechanical strength, and has good industrial application prospects.

The invention relates to a C9<+> aromatic hydrocarbon lightening catalyst, comprising a high-temperature-resistant inorganic oxide carrier and the following components accounted by taking the dry basis carrier as benchmark: 0.01-10.0 weight percent of hydrogenation metal, 0.01-1.0 weight percent of IVA-group metal and 0.1-5.0 weight percent of halogen; wherein, the hydrogenation metal is selected from iron, cobalt, nickel and iridium. The catalyst is used for lightening C9<+> heavy aromatic hydrocarbon. The catalyst has high lightening transformation ratio, high aromatic hydrocarbon yield and less carbon deposition; and the catalyst can effectively lower final boiling point and gum level of the heavy aromatic hydrocarbon.

The invention relates to a catalyst for preparing p-xylene as well as a preparation method and application of the catalyst. The catalyst is a core-shell structure molecular sieve and comprises an inner core molecular sieve and a shell layer molecular sieve coating the surface of the inner core molecular sieve, wherein the inner core molecular sieve is a ZSM-5 molecular sieve, the shell layer molecular sieve is an S-1 molecular sieve, and hydrogenation metal is packaged in the inner core molecular sieve; the catalyst has high conversion rate and selectivity to the product p-xylene in the process of catalyzing the alkylation reaction of toluene and methanol, the carbon deposition rate of the catalyst in the catalytic process is obviously reduced, and the catalyst has high stability.