71 results about "Higher alkanes" patented technology

Nucleic acids encoding cytochrome P450 variants are provided. The cytochrome P450 variants of have a higher alkane-oxidation capability, alkene-oxidation capability, and/or a higher organic-solvent resistance than the corresponding wild-type or parent cytochrome P450 enzyme. A preferred wild-type cytochrome P450 is cytochrome P450 BM-3. Preferred cytochrome P450 variants include those having an improved capability to hydroxylate alkanes and epoxidate alkenes comprising less than 8 carbons, and have amino acid substitutions corresponding to V78A, H236Q, and E252G of cytochrome P450 BM-3. Preferred cytochrome P450 variants also include those having an improved hydroxylation activity in solutions comprising co-solvents such as DMSO and THF, and have amino acid substitutions corresponding to T235A, R471A, E494K, and S1024E of cytochrome P450 BM-3.

The invention provides a method for preparing alkane fuel with a high cetane number by catalyzing plant oil or long-chain fatty acid by a Ru catalyst, which comprises the following steps: (1) mixing plant oil or long-chain fatty acid with a solvent in proportion; (2) adding a catalyst with the hydrogenation function into the mixed solution in step (1); (3) reacting in reducing atmosphere to obtain long-chain alkane with a main component of C15-C18. The method for catalyzing plant oil or long-chain fatty acid by a Ru catalyst provided by the invention has a high fatty acid conversion rate and a high alkane yield. In addition, the method of the invention is simple in process, convenient for operation, and mild in reaction condition; the whole reaction process is basically free of carbon deposition; the catalyst is cheap, easily available, and suitable for multi-time repeated use without activity reduction. The product of the invention can be used directly as diesel oil, and has important economic and social meaning for vehicle liquid fuel sustainable supply.

A catalyst for alkane dehydrogenation comprises a component A and a component B, wherein the component A is an oxide selected from one or more of La, Fe, Zn, Cu, Co or Ce, and the content of the component A in the catalyst accounts for 0.5 to 50 wt%, preferably 10-30 wt%; the component B is a mixed oxide or a composite oxide selected from one or more of SiO2, Al2O3, ZrO2, Ga2O3 and MgO, and the content of the component B in the catalyst accounts for 50 to 99.5 wt%, preferably 70-90 wt%. The catalyst provided by the invention has high alkane single-pass conversion and high selectivity of olefin, after repeated regeneration, the reactivity is very stable, and the catalyst is used in a circulating fluidized bed reaction device.

The invention relates to a preparation method of magnesium aluminate spinel for a catalyst carrier; a sol-gel method is adopted for preparation, and the preparation method comprises the following steps: (1) under a condition of the temperature of 50-80 DEG C, mixing water and ethylene glycol together; (2) adding citric acid, a magnesium source and an aluminum source into the ethylene glycol aqueous solution with the molar ratio of citric acid (CA) to Mg to Al of 6 to (0.9-1) to (2-2.2); (3) heating the solution until the solution becomes a transparent red gel, and aging; and (4) at the temperature of 350-500 DEG C, roasting for 2-4 h, grinding, again roasting for 2-12 h at the temperature of 600-800 DEG C, and thus obtaining the magnesia alumina spinel carrier. The prepared magnesia alumina spinel product is mainly used for a carrier of a low-carbon alkane dehydrogenation reaction catalyst, is loaded with 0.01-0.5 wt.% of a platinum-family transition metal element, 0.01-1 wt.% of Sn, and has smaller size, higher specific surface, and suitable pore structure; and compared with a conventional dehydrogenation catalyst carrier, the carrier has the characteristics of high alkane conversion rate, good stability, and good monoolefine selectivity.

The invention discloses a preparation method of a dehydrogenation catalyst. The preparation method comprises the following steps: (1) the ZSM-5 molecular sieve, aluminum oxide, sesbania powder and a dilute nitric acid solution are mixed, pulping, mixing and kneading, band extrusion, drying, and calcination are carried out, and the aluminum oxide carrier doped with ZSM-5 molecular sieve is obtained; wherein relative crystallinity of the ZSM-5 molecular sieve is 40-80%; (2) the carrier obtained in the step (1) is impregnated with an Sn-containing precursor, drying and calcination are carried out, and an Sn-loaded aluminum oxide carrier is obtained; (2) chloroplatinic acid, potassium nitrate and water are uniformly mixed, an impregnating solution is obtained, and the carrier obtained in the step (2) is impregnated with the impregnating solution; (4) programmed heating and drying, calcination, washing, drying and dehydration, and modification with a metal additive are carried out for the carrier which is treated by the impregnation in the step (3), and the dehydrogenation catalyst is obtained. The catalyst has the advantages of high alkane transformation efficiency, good alkene selectivity and good stability in the dehydrogenation reaction of light alkanes.

The invention discloses a method for preparing a low-carbon alkane dehydrogenation catalyst. The method comprises the following steps: 1)mixing a ZSM-5 molecular sieve, alumina, sesbania powder and a dilute nitric acid solution, beating the materials, kneading the materials, extruding the materials, drying and performing calcination to obtain a ZSM-5 molecular sieve-doped alumina carrier; 2) impregnating the carrier by using a Sn-containing predecessor solution, drying the carrier and performing calcination on the carrier to obtain the Sn-containing carrier; 3) dropping ammoniacal liquor and adding the material into a ZnCl2 aqueous solution, preparing a Zn(NH3)4C12 solution, adding a platinum-containing compound to prepare an impregnation solution; and 4) performing impregnation on the Sn-containing carrier by using the impregnation solution in the step 4), drying the material, and performing calcination to obtain the low-carbon alkane dehydrogenation catalyst. The prepared low-carbon alkane dehydrogenation catalyst has high alkane conversion rate, alkene selectivity and good stability in a low carbon alkane dehydrogenation reaction.

The present invention discloses a composition for preparing a catalyst having a hydrocracking effect, the catalyst prepared from the composition, and applications of the catalyst. The composition contains a carrier, a compound containing a group VIII metal element, a compound containing a group VIB metal and an organic additive, wherein the organic additive is selected from an organic acid and an organic amine, the carrier contains a dealuminzation Y-type molecular sieve and a heat-resistant inorganic oxide, the cell constant of the dealuminzation Y-type molecular sieve is 2.430-2.450 nm, the relative crystallinity is more than 65%, the secondary pore volume is 0.1-0.3 mL/g, the alkali metal element content is less than 0.2 wt% (calculated as the oxide), and the number of the non-skeleton aluminum in the unit cell is less than 3. The present invention further discloses a hydrocracking method using the catalyst. According to the present invention, the catalyst prepared from the composition has high catalyst activity and has high middle distillate selectivity, and the obtained tail oil has low BMCI value and high alkane content.

The present invention provides a low carbon alkane dehydrogenation olefin production catalyst and a preparation method thereof. According to the catalyst, a carrier is loaded with 0.01-5% by mass of a platinum group transition metal element, 0.01-10% by mass of a gold element, 0.01-10% by mass of a Group VIA metal element, and 0.01-10% by mass of an alkali metal element; or 0.2-15% by mass of a halogen element and 0.01-3% by mass of a sulfur element are added to be adopted as a modification component; the Group VIA metal element, the platinum group transition metal element, the gold element, the alkali metal element, the halogen element and the sulfur element are sequentially and respectively impregnated onto a carrier such as silica, a molecular sieve, magnesium-aluminum spinel or alumina, and a steam treatment is performed after the Group VIA metal element, the platinum group transition metal element and the gold element are impregnated and loaded on the carrier, wherein the Group VIA metal element, the platinum group transition metal element, the gold element, the alkali metal element, the halogen element and the sulfur element are adopted as catalyst components; and the catalyst has characteristics of high alkane conversion rate, high monoene selectivity and good stability.

Embodiments of the present invention are directed to apparatus and methods for converting carbon dioxide and/or methane into higher alkanes and hydrogen gas in a single reaction chamber using a catalyst and microwave radiation.

The invention discloses a dehydrogenation catalyst and a preparation method thereof. The catalyst adopts ZSM-5 molecular sieve doped alumina as a carrier, Pt as an active component and Sn and Na as assistants, and the catalyst comprises, by weight, 0.1-5% of Sn, 0.05-1% of Pt, 0.01-2% of Na, and the balance of the carrier; and the carrier comprises 20-50 wt% of ZSM-5 molecular sieve, wherein the relative crystallinity of the ZSM-5 molecular sieve is 40-80%. The preparation method comprises the following steps: 1, mixing the ZSM-5 molecular sieve, alumina, Sesbaria cannabina powder and a diluted nitric acid solution, beating the obtained mixture, kneading the beaten mixture, extruding the kneaded mixture to form strips, drying the strips, and roasting the dried strips to obtain the carrier; 2, loading the assistant Sn to the carrier; and 3, impregnating the carrier obtained in step 2 in an impregnating solution containing the active component, drying the impregnated carrier, and roasting the dried carrier to obtain the dehydration catalyst. The catalyst has high alkane conversion rate, high olefin selectivity and good stability in a low-carbon alkane dehydrogenation reaction.

The invention relates to preparation and application of a boron modified boron nitride catalyst for oxidative dehydrogenation of low-carbon alkane and relates to catalysts. A boron source and boron nitride are mixed and dissolved in a solvent; after the solvent is volatilized, heat treatment is carried out to obtain a boron modified boron nitride material. The boron modified boron nitride catalystprepared by the invention is a non-metal catalyst without any metal and has high olefin selectivity and stability when being used for the oxidative dehydrogenation of the low-carbon alkane includingethane, propane and isobutane. Compared with the boron nitride, a relatively high alkane conversion ratio can be obtained under the condition that the olefin selectivity is ensured, and the yield of olefin is improved. According to the technical scheme for preparing the boron modified boron nitride catalyst, when the boron modified boron nitride material is prepared, a method for volatilizing thesolvent can be realized through selecting common manners including heating and stirring, natural volatilization, ultrasonic evaporation, rotary evaporation or spraying drying and the like.

Disclosed is a process for converting naphtha. Lower olefin, light aromatic hydrocarbon, and gasoline with high octane number are produced through combining catalytic cracking of naphtha with steam cracking of lower alkane and catalytic cracking of higher alkane and higher olefin. The process increases the yield of product with high value and decreases the yield of product with low value significantly. At the same time, the power consumption is decreased as a whole since most reactants are converted in catalytic cracking at lower temperature.

High octane C₇ hydrocarbons, particularly 2,2,3-trimethylbutane (“triptane”) and 2,2,3-trimethyl-but-1-ene (“triptene”) (collectively “triptyls”) are produced by homologation of a feed comprising dimethyl ether and/or methanol and optionally including one or more aliphatic hydrocarbons in the presence of certain acidic zeolite catalysts. The process can be carried out at temperatures lower than those previously used for conversion of dimethyl ether and/or methanol to higher alkanes, including C₇ alkanes, and results in selective production of triptane and/or triptene with relatively little isomerization to or production of other C₇ alkanes.

Polymerization processes having as constituent parts high conversion membrane reactors, that provide a source of monomer, and subsequent polymerization of the monomer, without passing products of the conversion through an alkane/alkene splitter, are disclosed. Polymers of light alkene hydrocarbons, such as ethylene, propylene and alkenes consisting of up to 6 carbon atoms, are prepared from gaseous feedstreams consisting predominantly of volatile alkane compounds substantially free of dihydrogen and/or dioxygen. Equipment required for separation of alkene products from unreacted alkanes in conventional plants is eliminated because of the high alkane conversions provided in the membrane reactors. Particularly useful are flow reactors comprising dense membranes of multiphasic materials that provide independent, controllable, counter-current transport of hydrogen, electrons and oxygen.

The invention relates to a catalyst applied to dehydrogenation of light alkane and a preparation method thereof. The catalyst is prepared from the following components in parts by weight: 1-30 parts of Cu element or oxides thereof, 0.1-5 parts of alkali metal oxides or alkaline earth metal oxides, 0.001-1 part of group VIII elements in the periodic table of elements or oxides thereof, 0.001-1 part of group IIIA elements in the periodic table of elements or oxides thereof, and 54-99 parts of Al2O3 or SiO2. Compared with the prior art, the catalyst has a higher alkane conversion rate which can be up to 60% at low reaction temperature, and high higher olefin selectivity, which is more than 90%, and achieves better technical effect.

Provided is a method for preparing fuel oil with high alkane content by co-cracking non-edible grease and waste plastic. The method comprises the steps that 1, the waste plastic is cut and broken into fragments of which the area is smaller than 100 cm<2>; 2, the waste plastic and the non-edible grease are mixed according to the mass ratio of 1:1-1:10; 3, the mixture is fed into a cracking reactor, air in the reactor is replace by nitrogen, heating is conducted, the heating rate is 5-300 DEG C/min, when the temperature of reactant is increased to 150 DEG C, a stirring device is started, heating is conducted continuously, the temperature of the cracking reaction is controlled to range from 350 DEG C to 600 DEG C, the reaction time is 2-90 min, and after gas-solid separation is conducted on a cracking reaction product, condensation is conducted on the gas, and the fuel oil with the high alkane content is obtained. By means of the method for preparing the fuel oil with the high alkane content by co-cracking the non-edible grease and the waste plastic, according to the problems that the plastic structure is compact and coking is serious in the cracking process, the swelling effect of the grease on the plastic and the characteristic that glycerin residues in the grease release free state hydrogen atoms under specific cracking conditions are fully utilized. The stable and high-quality liquid fuel oil of which the oil productivity is over 85% and the alkane content reaches up to 74% is obtained.

A heat storage material composition having a melting temperature utilized for control of an optional management temperature, providing no variation in melting behavior and solidification behavior, and having a constant melting temperature. The heat storage material composition consists primarily of a mixture of a higher alkane having carbon number of 9 to 24 and a higher alcohol having carbon number of 6 to 20, and the mixture has a substantially single melting peak in DSC curve measured by a differential scanning calorimeter (DSC).

The invention provides a method for producing aromatic hydrocarbon by light hydrocarbon dehydrogenation aromatization. The method comprises the following steps: 1) under dehydrogenation reaction conditions, carrying out dehydrogenation reaction on a light hydrocarbon material flow to obtain a material flow containing olefin; and 2) under aromatization reaction conditions, contacting the olefin-containing material flow with an aromatization catalyst, and carrying out an oligomerization/aromatization reaction to obtain an aromatic hydrocarbon-containing material flow. The thinking set that a bifunctional catalyst is used in the prior art is broken through, dehydrogenation and oligomerization/aromatization are separated, different conditions are used for executing in steps, and the following effects are achieved: 1) light hydrocarbon conversion can be independently controlled by changing the conditions of a dehydrogenation zone so as to realize minimum inactivation; and 2) the product selectivity can be independently controlled in oligomerization/aromatization, and the lowest methane selectivity and reverse reaction are achieved. The method has the advantages of high alkane conversion rate, high liquid aromatic hydrocarbon yield, slow catalyst deactivation and easy regeneration of the catalyst.