113results about How to "Reduce coking rate" patented technology

The invention discloses a nano ZSM-5 molecular sieve based catalyst and preparation and use methods. The molecular sieve catalyst consists of molecular sieves and metal components, wherein the molecular sieves are nano ZSM-5 molecular sieves with a short b-axis, a medium high silica-alumina ratio, less strong acid, high Lewis acid content, and resistance to hydrothermal deactivation. The preparation method is as follows: mixing a silicon source, an aluminum source, a template agent, a structure promoter, an additive and alkali with water, and stirring to prepare a precursor solution, then crystallizing, separating solid from liquid, and calcinating to obtain molecular sieve raw powder; mixing the molecular sieve raw powder with an ammonium salt solution, stirring, filtering, mixing with the ammonium salt solution for several times, stirring, filtering, and calcinating to obtain hydrogen-type ZSM-5 molecular sieves; mixing with the metal precursor solution, drying and calcinating to obtain the aromatization catalyst. The use method is as follows: transforming oxy-compound raw materials to aromatic hydrocarbon through the catalyst under the reaction conditions. The nano ZSM-5 molecular sieve based catalyst has the characteristics of being high in aromatics yield (reaching up to 99%) and long in service life (the catalyst is alive after 300 hours, and the aromatics selectivity reaches up to 70% after the catalyst is subjected to hydrothermal aging at 760 DEG C for 4 hours).

Bismuth- and phosphorus-containing naphtha reforming catalysts, methods of making such catalysts, and a naphtha reforming process using such catalysts.

The invention discloses a mesoporous titanium-silicon molecular sieve, and a preparation method and application thereof. The titanium-silicon molecular sieve is a mesoporous nano titanium-silicon molecular sieve TS-1. The invention also discloses a novel catalyst for preparing an epoxy propane system through direct gas-phase epoxidation of propylene. Metal particles are loaded on the catalyst by taking the mesoporous nano titanium-silicon molecular sieve TS-1 provided by the invention as a supporter.

The invention discloses a heavy oil modifying method which comprises the following steps: mixing a heavy oil raw material with a homogeneous catalyst, and mixing with a supercritical hydrogen supply solvent, wherein the content of the hydrogen supply solvent in the heavy oil raw material is 50 mug/g-5wt%; and in the presence of hydrogen, carrying out heavy oil hydrocracking reaction on the mixture of the heavy oil raw material, the catalyst and the hydrogen supply solvent under certain reaction conditions. In the heavy oil modifying method, suspension bed hydrocracking and supercritical treatment are organically combined, and the respective advantages are given full play to achieve the effect of synergic cooperation, thereby reducing the coking tendency, enhancing the impurity removal capacity and also enhancing the operational stability of the suspension bed hydrocracking.

The invention discloses a method of preparing the pentafluoroethane (HFC-125), which adopts the hydrogen fluoride (HF) and the perchlorethylene (PCE) as the material, and takes two reactors and two steps of gas phase catalysis fluorination reaction. A first reactor fluorinates the PCE and synthesizes 2,2-dichlor-1,1,1-trifluoroethane(HCFC-123) and 2-chlorin-1,1,1,2-tetrafluorothane(HCFC-124), and the second reactor fluorinates HCFC-123 and HCFC-124 and synthesizes HFC-125. The unreacted PCE in the resultant flow of the first reactor is separated by a first distillation tower and then circulates to the first reactor; the HF, HCFC-126, HCFC-124, HFC-125 and HCL in the resultant flow of the first reactor and the second reactor are separated by a second distillation tower and a third distillation tower, and then the separated HF circulates to the first reactor and the second reactor, while the HCFC-123, the HCFC-124 and the HFC-134a circulate to the second reactor. The invention can prolong the service life of the catalyst and improve the one-way conversion of PCE as well as remarkably reduce the content of chloropentafluoroethane(CFC-115) in the desired product HFC-125.

The invention relates to a hydrofining catalyst which is obtained by adding a carrier into a dipping liquid for aging and drying after dipping, and then activating. The catalyst, containing the carrier, molybdenum and cobalt, is characterized by containing molybdenum oxide 5-25%, cobalt oxide 1-6%, tungstic oxide 0-15%, nickel oxide 0-4%, and alkali metal oxides 0-4.5%, by the catalyst weight of 100%. Besides, the catalyst pore volume is 0.30-0.85ml/g, and the specific surface area is 110-380 m <2>/g. Compound solvent in the catalyst preparation contains ammonia water and polyamine complexingagent at the same time. The catalyst of the invention while undergoing hydrodesulfurization, saturates monoolefine to the maximum through hydrogenation, to be able to meet the requirements of an oil product with changeable sulfur and diene contents and high air speed running. Catalyst has good hydrogenation activity, high selectivity, long running time and superior anti coking performance.

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 discloses a titanium silicalite molecular sieve, a preparation method therefor and applications. The titanium silicalite molecular sieve is uncalcined titanium silicalite molecular sieve TS-1. The invention also discloses a new catalyst applied to systems of direct preparation of epoxypropane from propylene through gas-phase epoxidation. The catalyst employs the uncalcined titanium silicalite molecular sieve TS-1 as a carrier and loads the carrier with metal particles.

The invention discloses a combination process of hydrogenation-catalytic cracking used for suspension bed residual oil. The method comprises the steps as follows: residual oil and catalytic cracking decanted oil enter a suspension bed hydrogenation reaction device and carry out hydrogenation reaction with the presence of hydrogen and a catalyst; the vacuum distillate oil gained during the hydrogenation reaction enters a catalytic cracking device, the vacuum residual oil is circulated back to the suspension bed hydrogenation device, and the catalytic cracking decanted oil and heavy circular oil can wholly or partly enter the suspension bed hydrogenation device which adopts a relatively moderate operation condition. The method organically combines the suspension bed hydrogenation device with the catalytic cracking device, and therefore not only ensures the stable running of the suspension bed hydrogenation device, but also improves the impurity removal capability of the suspension bed hydrogenation device, improves the raw material quality of the catalytic cracking device, and increases the yield of the light oil products.

The invention relates to a method for coprocessing glycerol and heavy oil in a hydrothermal mode to simultaneously obtain lactic acid and light oil, which comprises the following steps: dissolving a certain amount of glycerol in an alkaline water solution, preheating the water solution and heavy oil through a heat exchanger, sending into a reactor to carry out reaction, cooling the reaction products through the heat exchanger, and separating out a gas phase component, a liquid phase component and an oil phase component, wherein the gas phase component mainly comprises hydrogen, and can be used for catalytic hydroprocessing of heavy oil after being purified; the liquid phase component mainly comprises lactates which can be purified and acidified to obtain lactic acid; and the oil phase component can be heated through the heat exchanger and then be treated in a fractionating tower to obtain light products of the heavy oil, such as gasoline, diesel oil, fuel oil and the like. Compared with the prior art, the invention converts glycerol into lactic acid in a hydrothermal mode, converts heavy oil into light oil while generating hydrogen from glycerol by hydrothermal reaction, and also has the functions of saving the energy, protecting the environment and removing sulfur, nitrogen and metallic impurities.

The invention provides a delayed coking method and apparatus for heavy oil; according to the method, coking tail gas is injected into a heating furnace radiating segment tube under delayed coking operational process conditions, operating is simple, the required apparatus is simple in structure, the coking tail gas, instead of steam, is injected into the heating furnace radiating segment tube, usage of steam is effectively reduced, the defect that existing coking heating furnace is injected with much water is overcome, processing energy consumption of the apparatus is reduced, sewage emission is decreased, liquid yield of the coking apparatus can be increased through circulation of partial coking tail gas, and especially the yield of coker gas oil is evidently increased.

The invention provides binder-free FAU type molecular sieve particles and a preparation method and application thereof. The method comprises the following steps that 1, an alkaline solution with an aluminum source dissolved serves as a water phase, and a surfactant aqueous solution and an oil phase are sequentially added to the upper portion of the water phase; (2) a silica gel mixture obtained byuniformly mixing a gelatinizing agent and silica sol is added, and the silica gel mixture penetrates through the oil phase and the surfactant phase to reach the water phase so as to obtain a silica gel precursor; and 3) the oil phase and the surfactant phase are removed, the silica gel precursor and the water phase are aged, and crystallized to obtain the binder-free FAU type molecular sieve particles. The experiment steps are effectively simplified, the experiment process is shortened, the environmental pollution problem caused by the high temperature hot oil is avoided, and the prepared binder-free FAU molecular sieve particles have characteristics of large specific surface area, large hexene adsorption capacity, high adsorption/desorption rate and excellent anti-coking performance in comparison with the particles in the prior art.

The invention discloses a method for improving the stability and the activity of a gold catalyst for preparing propylene oxide through propylene epoxidation. Silver metals are added to the gold catalyst to form nanometer gold silver alloy particles of which the particle sizes are small, and the alloy is used for changing oxygen adsorption, so that the content and the nature of coke are further improved, and the catalyst activity and the stability of a gold-silver alloy catalyst are greatly improved.

The invention relates to an unsaturated C5 fraction and hydrogenation method. According to the method, by the aid of a fixed bed reactor, a used catalyst is a nickel hydrogenation catalyst, and the catalyst is reduced by the aid of hydrogen or hydrogen-containing gas at the temperature of 350-500 DEG C. The catalyst comprises main active components and a silicon oxide-aluminum oxide composition, and the main active components include molybdenum, nickel, cobalt and potassium. Hydrogenation process conditions include that a reactor inlet temperature is 30-660 DEG C, reaction pressure is 1.5-6.0MPa, liquid volume per hour is 1.0-6.0h<-1>, and the volume ratio of hydrogen to oil is 100:400. According to the unsaturated C5 fraction and hydrogenation method, the used nickel-based saturated hydrogenation catalyst has high hydrogenation activity and the advantages that the catalyst is resistant to sulfur, water and colloid, and hydrogenation reaction can be performed at low temperature.

A process for converting methane to higher hydrocarbon(s) including aromatic hydrocarbon(s) in a reaction zone comprises providing to a hydrocarbon feedstock containing methane and a catalytic particulate material to the reaction zone and contacting the catalytic particulate material and the hydrocarbon feedstock in a substantially countercurrent fashion in the reaction zone, while operating the reaction zone under reaction conditions sufficient to convert at least a portion of said methane to a first effluent having said higher hydrocarbon(s).