6611 results about "Dehydrogenation" patented technology

The invention relates to a catalyst for dehydrogenating propane to prepare propone, which uses thermal-resistant oxide as carrier, uses palladium-group metal as main catalyst, uses IV A group metal and rare-earth metal as agents, uses halogen as modifier, and uses inorganic oxide with high temperature resistance as adhesive. The inventive catalyst under high temperature and low pressure has higher propane transfer rate, propone selectivity and reaction stability. And the preparation comprises that at 60-100Deg. C, immerging thermal-resistant oxide with rare-earth metal water solution for 2-10h, at 60-180Deg. C baking for 2-10h, at 400-600Deg. C baking for 3-10h, immerging said carrier and the water solution which contains palladium metal and IVA metal at 60-100Deg. C for 2-10h, and baking for 2-10h at 60-180Deg. C, adding adhesive, protruding agent and acid gel solvent, protruding and shaping, baking for 2-10h at 60-180Deg. C, activating for 3-10h at 400-600Deg. C, and reducing for 2-10h in hydrogen flow at 400-600Deg. C.

The invention discloses a low-carbon alkane dehydrogenation catalyst and a preparation method thereof. The catalyst is prepared from chromium serving as an active metal ingredient, alkali metal serving as an auxiliary catalytic ingredient and chromium-containing aluminum oxide serving as a carrier, wherein the weight content of the chromium oxide in the carrier is 2.0 to 15.0 percent. In the method, the active metal ingredient, namely chromium, is introduced into the aluminum oxide carrier by partially using a kneading method and partially using an immersion method; pseudo-boehmite mixed with chromium is processed by adopting a three-step roasting method and a hydrothermal method; and thus, the porous structure and the surface character of the carrier can be improved, the content and the distribution of the active metal chromium in the carrier and the mutual effect between the active metal and the aluminum oxide are further modulated, the activity and the stability of the catalyst are improved, the carbon depositing resistance of the catalyst is enhanced, and the service life of the catalyst is prolonged.

Oxidative dehydrogenation of paraffins to olefins provides a lower energy route to produce olefins. Oxidative dehydrogenation processes may be integrated with a number of processes in a chemical plant such as polymerization processes, manufacture of glycols, and carboxylic acids and esters. Additionally, oxidative dehydrogenation processes can be integrated with the back end separation process of a conventional steam cracker to increase capacity at reduced cost.

The invention relates to a new and improved process and apparatus for the production of high purity hydrogen by steam reforming. The apparatus is an integrated flameless distributed combustion-membrane steam reforming (FDC-MSR) or reactor for steam reforming of a vaporizable hydrocarbon to produce H₂ and CO₂, with minimal CO, and minimal CO in the H₂ stream. The flameless distributed combustion drives the steam reforming reaction which pro-vides great improvements in heat exchange efficiency and load following capabilities. The reactor may contain multiple flameless distributed combustion chambers and multiple hydrogen-selective, hydrogen-permeable, membrane tubes. The feed and reaction gases may flow through the reactor either radially or axially. A further embodiment of the invention involves producing high purity hydrogen by dehydrogenation using an integrated FDC-membrane de-hydrogenation reactor. A still further embodiment of the invention involves a zero emission hybrid power system wherein the produced hydrogen is used to power a high-pressure internally manifolded molten carbonate fuel cell. In addition, the design of the FDC-SMR powered fuel cell makes it possible to capture good concentrations of CO₂ for sequestration or use in other processes.

The invention relates to a catalyst to make the propene by dehydrogenation propane which takes the modifying alumina medium molecular sieve as the carrier. The catalyst takes the modifying medium molecular sieve by the Al2O3 as the carrier; the platinum and tin double metal catalyst has an alumina weight proportion of 5.0 to 30.0 percent. The active component of the catalyst is the platinum; the weight proportion of the platinum is 0.4 percent; and the weight proportion of the accessory ingredient Sn is 0.1 to 2.0 percent.

The invention relates to a catalyst used for catalyzing and dehydrogenation of low-carbon alkane and the method of producing propylene by alkane catalyzing and dehydrogenation with the catalyst. The former catalyst used for catalyzing and dehydrogenation of low-carbon alkane, each molecule of the hydrocarbon has about 2 to 8 carbon atom, which is characterized in that: the catalyst makes a molecular sieve the carrier, the Pt family metal is loaded on the carrier as the active component, makes the IVA family metal element and alkalinity metal element as additional agent and high temperature standing inorganic oxide as connection agent; when the catalyst is used in producing propylene by alkane catalyzing and dehydrogenation, the reaction temperature is 500 to 700 DEG C., the pressure is 0 to 0.2Mpa, the quality air speed is 2 to 5h to 1, the regenerating temperature of the catalyst is 500 to 700 DEG C., the air speed is 100 to 1000h to 1, the pressure is 0 to 1.0MPa. With adopting the invention, the reaction of producing propylene by alkane catalyzing and dehydrogenation is good, the average transforming rate is 30 per cent, the selectivity above 95 per cent can keep for 50 days.

A catalyst for the selective oxidation of hydrogen has been developed. It comprises an inert core such as cordierite and an outer layer comprising a lithium aluminate support. The support has dispersed thereon a platinum group metal and a promoter metal, e.g. platinum and tin respectively. This catalyst is particularly effective in the selective oxidation of hydrogen in a dehydrogenation process.

A method comprising providing a carbohydrate feed; contacting at least a portion of the carbohydrate feed directly with hydrogen in the presence of a hydrogenolysis catalyst to produce a first reaction product comprising a stable hydroxyl intermediate; contacting at least a portion of the first reaction product comprising the stably hydroxyl intermediates with a dehydrogenation catalyst to form a second reaction product; and contacting at least a portion of the second reaction product with a condensation catalyst comprising a base functionality to form a fuel blend.

The invention discloses a preparation method of Roxadustat. The preparation steps are as follows: the Roxadustat is prepared from tyrosine through esterification, etherification, cyclization, dehydrogenation, oxidative rearrangement and acylation reaction. The preparation method has the advantages that the raw materials are easily obtained; the process is simple; and the preparation method is economic and environmental-friendly, and is suitable for industrialized production.

The invention relates to a process for preparing butadiene from n-butenes, which comprises the following steps:

• • A) provision of a feed gas stream a comprising n-butenes;
  • B) introduction of the feed gas stream a comprising n-butenes and an oxygen-comprising gas into at least one dehydrogenation zone and oxidative dehydrogenation of n-butenes to butadiene, giving a product gas stream b comprising butadiene, unreacted n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases;
  • C) cooling and compression of the product gas stream b in at least one cooling stage and at least one compression stage, with the product gas stream b being brought into contact with a circulated coolant to give at least one condensate stream c1 comprising water and a gas stream c2 comprising butadiene, n-butenes, water vapor, oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases;
  • D) separation of incondensable and low-boiling gas constituents comprising oxygen, low-boiling hydrocarbons, possibly carbon oxides and possibly inert gases as gas stream d2 from the gas stream c2 by absorption of the C₄-hydrocarbons comprising butadiene and n-butenes in a circulated absorption medium, giving an absorption medium stream loaded with C₄-hydrocarbons and the gas stream d2, and subsequent desorption of the C₄-hydrocarbons from the loaded absorption medium stream to give a C₄ product gas stream d1;
  • E) separation of the C₄ product stream d1 by extractive distillation using a solvent which is selective for butadiene into a stream e1 comprising butadiene and the selective solvent and a stream e2 comprising n-butenes;
  • F) distillation of the stream e1 comprising butadiene and the selective solvent to give a stream f1 consisting essentially of the selective solvent and a stream f2 comprising butadiene;
  • where samples are taken from the circulated coolant in step C) and/or the circulated absorption medium in step D) and the peroxide content of the samples taken is determined by means of iodometry, differential scanning calorimetry (DSC) or microcalorimetry.

The present invention relates to compositions and rigid porous structures that contain nanorods having carbides and/or oxycarbides and methods of making and using such compositions and such rigid porous structures. The compositions and rigid porous structures can be used either as catalysts and/or catalyst supports in fluid phase catalytic chemical reactions. Processes for making supported catalyst for selected fluid phase catalytic reactions are also provided. The fluid phase catalytic reactions catalyzed include hydrogenation hydrodesulfuriaation, hydrodenitrogenation, hydrodemetallization, hydrodeoxygenation, hydrodearomatization, dehydrogenation, hydrogenolyis, isomerization, alkylation, dealkylation, oxidation and transalkylation.

A process for preparing a catalyst which process comprises preparing a mixture comprising iron oxide and at least one Column 1 metal or compound thereof, wherein the iron oxide is obtained by heating a mixture comprising an iron halide and at least 0.05 millimoles of a Column 6 metal per mole of iron; a catalyst made by the above described process; an iron oxide composition; a process for the dehydrogenation of an alkylaromatic compound which process comprises contacting the alkylaromatic compound with the catalyst; and a method of using an alkenylaromatic compound for making polymers or copolymers, in which the alkenylaromatic compound has been produced by the dehydrogenation process.

The present invention is directed generally to a method of production of biobased chemicals, biofuels, and lignin residues from lignin sources, including waste lignin. This method may allow for selectively producing biobased chemicals, biofuels, and lignin residues from lignin sources using certain processing methods. The methods for production of these biobased chemicals, biofuels, and lignin residues may be provided by chemical-induced processing, catalytic oxidative lignin depolymerisation processing, and catalytic hydroprocessing. Further, the catalytic hydroprocessing from processes including catalytic reduction processing, catalytic hydrodeoxygenation processing, and/or catalytic/dehydrogenation processing may also be used. The method described herein also provides a means in which waste from the process(es) may be reduced and/or recycled.

The invention relates to a method for preparing a propylene catalyst by a propane dehydrogenation process and mainly solves the problem in the high-temperature and charcoal-burning process of the catalyst in the conventional preparation technology that a tin component is easy to reduce and separate out so as to influence the performance of the catalyst. The invention better solves the problem through the technical scheme comprising the following steps of: firstly, introducing the tin component into an aluminum sol by a sol-gel method, and drying and forming the mixture to obtain a tin-containing alumina supporter; secondly, loading a platinum component and other metallic aids by an impregnation method, namely impregnating the tin-containing alumina supporter into aqueous solution of soluble salt of platinum and other metals; and finally, drying, roasting and dechlorinating the product to obtain the platinum-tin catalyst. The method of the invention can be used for industrial preparation of the propylene catalyst by the propane dehydrogenation process.

This invention relates to the field of heterogeneous catalysis, and more particularly to catalysts including carbon supports having formed thereon compositions which comprise a transition metal in combination with nitrogen and/or carbon. The invention further relates to the fields of catalytic oxidation and dehydrogenation reactions, including the preparation of secondary amines by the catalytic oxidation of tertiary amines and the preparation of carboxylic acids by the catalytic dehydrogenation of alcohols.