32results about How to "Increase the rate of the hydrogenation reaction" patented technology

The invention relates to a technology and a device system for producing dimethyl oxalate by high-pressure carbonylation of industrial synthesis gases and producing ethylene glycol through dimethyl oxalate hydrogenation. The technology comprises the following steps: adopting industrial NO, O2 and methanol as raw materials for an esterification reaction to produce methyl nitrite; adopting industrial CO and methyl nitrite for a carbonylation reaction in a plate reactor to produce carbonylation products, which mainly include dimethyl oxalate and dimethyl carbonate; separating the carbonylation products to obtain dimethyl carbonate products; subsequently adding hydrogen into dimethyl oxalate in the plate reactor to produce ethylene glycol products; conducting the coupling recovery treatment on waste acids in the esterification reaction and purge gases in the carbonylation reaction for recycling. The device system comprises an esterification reaction system, a carbonylation reaction system, a coupling recovery system for purge gases and waste acids and a hydrogenation reaction system. The technology has the characteristic that device consumption is remarkably reduced, and particularly the nitric acid waste liquid recycling and purge gas recycling technologies as well as the separation technologies thereof are highly coupled; recycling of the raw materials in reaction waste gases is realized, and the effect is remarkable.

The invention provides a coal direct hydro-liquefaction method. According to the method, under a coal direct hydro-liquefaction reaction condition, a raw material mixture containing coal, a catalyst and a solvent contacts hydrogen in a tubular reactor, such that a liquefied product containing liquid hydrocarbon oil is obtained. According to the method, hydrogen is added into the tubular reactor from at least two positions of the tubular reactor. Compared with prior arts, the method employs a small-diameter tubular reactor which is easy to manufacture and to install. With the method provided by the invention, excess hydrogen amount during a reaction process is reduced, the utilance of hydrogen and the reactor is improved, the reaction time is reduced, secondary decomposition of the target product is reduced, and condensing and coking reactions of macro-molecule organic compounds are reduced.

The invention provides a CO2 low-temperature methanation catalyst, which belongs to the technical field of the methanation catalyst. The catalyst comprises a carrier, an active component and an auxiliary agent, the carrier comprises Al2O3 and carbon nanotubes, the active component is NiO, and the auxiliary agent is selected from one or two of La2O3 and CeO2; by taking total mass percentage of thecatalyst, the content of the Al2O3 is 55 to 85 wt%, the content of the CNTs is 1 to 20 wt%, the content of the active component NiO is 10 to 25 wt%, and the content of the auxiliary agent is 0 to 5 wt%. The invention also provides a preparation method and application of the catalyst. The catalyst of the invention uses Al2O3-CNTs as a composite carrier to load metal nickel, which can significantlyimprove the low temperature stability of the catalyst. The catalyst of the invention has high strength and excellent CO2 low-temperature methanation activity, and the catalyst of the invention after high temperature operation has high low-temperature activity and good catalyst stability. The catalyst preparation method is simple, and has industrial application prospect.

The invention relates to a production process of neopentyl glycol. The production process comprises the following steps: (1) mixing formaldehyde, isobutyraldehyde and triethylamine and performing condensation reaction to obtain a hydroxypentaldehyde solution; (2) adding methanol and a catalyst into the hydroxypentaldehyde solution obtained in the step (1) and performing hydrogenation reaction to obtain a neopentyl glycol solution; (3) purifying the neopentyl glycol solution obtained in the step (2) to obtain a neopentyl glycol finished product, wherein the catalyst in the step (2) is a molybdenum and chromium-modified active copper catalyst. The purifying method in the step (3) comprises the following steps: extraction, reduced-pressure distillation twice, gasification and condensation-crystallization. The production process of the neopentyl glycol, provided by the invention, has the benefits that less wastewater is produced, the requirements for equipment are low, the production cost is low, the production process is short, and the product purity can reach 99.7 percent.

The invention discloses a hydrogenation method for improving the yield of a bisphenol-A type hydrogenated epoxy resin. The method comprises a step of uniformly dispersing hydrogen which is input into a hydrogenation reaction tank by using a guidance gas stirrer with aspiration, exhaust and stirring functions in the hydrogenation reaction tank through the aspiration, exhaust and stirring of the guidance gas stirrer. The method ensures that reaction fluid contains high-concentration dissolved hydrogen, so that a hydrogenation catalyst has extremely high activity and the rate of a hydrogenation reaction is accelerated; and the method can ensure that the hydrogenation reaction is performed at low temperature and under low pressure, even increase the yield of the bisphenol-A type hydrogenated epoxy resin to be between 99.0 and 99.9 percent, greatly reduce the construction and maintenance cost of the hydrogenation reaction tank, and improve economic benefit.

The invention relates to a liquid-phase hydrogenation reactor and a hydrogenation process, the liquid-phase hydrogenation reactor comprises an inner cylinder and a reactor shell, the inner cylinder is conical, the top and the bottom of the inner cylinder are open, the edge of the bottom of the inner cylinder is hermetically connected with the inner wall of the reactor, and a plurality of small holes are formed in the wall of the inner cylinder; a ceramic membrane tube bundle is vertically arranged in the axial direction of the reactor and is communicated with external hydrogen; the inner cylinder is filled with a hydrogenation catalyst I, the annular cavity is filled with a hydrogenation catalyst II, and the activity of the hydrogenation catalyst I is higher than that of the hydrogenation catalyst II; the reactor raw material inlet communicates with the top of the inner cylinder; the materials flow in the inner cylinder from top to bottom; the materials flow in the annular cavity from top to bottom. According to the method, the contact time of the material and the catalyst in the whole hydrogenation reaction process can be effectively controlled, so that the temperature rise of a catalyst bed layer is more uniform, the problems of severe heat release and reaction conversion rate inhibition in the reaction process are solved, and higher hydrogenation reaction rate and conversion rate in the whole liquid-phase hydrogenation reaction process are achieved.

The invention relates to the technical field of reactor equipment, and particularly relates to a heat-preservation type hydrogenation reactor. The heat-preservation type hydrogenation reactor comprises a tank body with a hollow interlayer structure, wherein a steam inlet and a steam outlet which are used for conveying steam to a hollow interlayer are formed in the tank body, a hollow mixing shaft connected with a mixing motor is suspended at the center of the tank body, a gas sucking hole, a gas self-suction paddle and a propelling mixing blade are sequentially and fixedly arranged on the mixing shaft from top to bottom; a feeding hole and a hydrogenation hole are formed in an end cover of the tank body, a discharging hole is formed in the upper-half part of the side wall of the tank body, and a heat-transferring plate is fixedly arranged on the inner wall of the tank body. The heat-preservation type hydrogenation reactor is reasonable in design and relatively small in probability of side reaction; the gas-liquid mixing effect is improved, and the hydrogenation reaction rate is increased.

The invention discloses a heavy oil hydrogenation reactor and a hydrogenation method. The reactor comprises a reactor outer cylinder, an inner cylinder I and an inner cylinder II, the inner cylinder I and the inner cylinder II are arranged in the axial direction of the reactor, the cross sectional area of the inner cylinder I is gradually reduced from top to bottom, and the cross sectional area of the inner cylinder II is gradually increased from top to bottom; an annular space is formed among the inner cylinder I, the inner cylinder II and the reactor outer cylinder body; wherein the inner cylinder I is filled with a hydrogenation catalyst I, the annular space is filled with a hydrogenation catalyst II, and the activity of the hydrogenation catalyst I is higher than that of the hydrogenation catalyst II. The viscosity of the material is reduced through the viscosity reduction assembly arranged in the inner cylinder II, and then the material sequentially passes through the inner cylinder I and the annular space to generate hydrogenation reaction, so that the mass transfer process driving force and reaction rate of heavy oil liquid phase hydrogenation reaction are improved, the contact time of the reaction material and different active catalysts is controlled, and catalyst surface coking is slowed down; the deep cracking reaction of the light oil is reduced, and the liquid yield and the heavy impurity removal conversion rate in the heavy oil liquid phase hydrogenation reaction process are improved.

The invention discloses a multi-phase catalytic hydrogenation reduction method of an unsaturated compound. The method comprises a step of carrying out multi-phase catalytic hydrogenation reaction to reduce the unsaturated compound; the multi-phase catalytic hydrogenation reaction takes water as a solvent and a hydrophobic and atmophile material as a catalyst. According to the multi-phase catalytichydrogenation reduction method, hydrophobic and atmophile properties of the catalyst are utilized, so that hydrogen gas can be rapidly adsorbed and spread on the surface of the catalyst, the surfacehydrogen concentration of the catalyst is improved, and the hydrogenation reaction speed is improved; a conventional pressurizing method is changed, so that requirements on equipment and dangerousnessare reduced. The atmophile catalyst Pd/GA can be used for hydrogenation of double bonds, nitryl and an aldehyde group under normal pressure, and is applicable to wide types. The method provided by the invention has a wide application potential in other fields needing gas to react.

The invention discloses a heavy oil hydrogenation process which comprises the following steps: (1) mixing hydrogen and a heavy oil raw material to obtain a first mixed feed; (2) the first mixed feed enters the shell side of the shell-and-tube inorganic membrane tube assembly from the bottom of the fixed bed reactor, and hydrogen is supplemented to enter the tube side to form a second mixed feed; and (3) enabling the second mixed feed to flow upwards into the upper cylinder, alternately carrying out hydrogenation reaction on the inner cylinder and the annular region under the action of a plurality of partition plates axially arranged in the inner cylinder and the annular region, and finally enabling a hydrogenation product to flow out from the upper part. The method solves the problem of large temperature rise in the early reaction stage of the heavy oil liquid phase hydrogenation process, ensures high conversion rate in the middle reaction stage, reduces the later deep cracking reaction, and improves the liquid yield.

The invention discloses a fixed bed hydrogenation reactor and a heavy oil liquid phase hydrogenation process, the hydrogenation reactor comprises a reactor outer cylinder body and an inner cylinder, an annular area is arranged between the outer cylinder body and the inner cylinder, the cross sectional area of the inner cylinder is gradually increased from top to bottom, and the cylinder wall of the inner cylinder is uniformly provided with holes communicated with the annular area; the top opening of the inner cylinder is flush with the bottom of a upper seal head of the reactor; the bottom of the inner cylinder is hermetically connected with a lower seal head of the reactor; a shell-and-tube ceramic membrane tube assembly is arranged at the bottom of the inner cylinder, a hydrogen supplementing pipeline is communicated with the ceramic membrane tube, and a liquid phase feeding pipeline is communicated with an in-shell cavity outside the ceramic membrane tube; partition plates are alternately arranged in the inner cylinder and the annular area at different heights; the inner cylinder is filled with a hydrogenation catalyst I, the annular area is filled with a hydrogenation catalyst II, and the activity of the hydrogenation catalyst I is higher than that of the hydrogenation catalyst II. According to the method, firstly, the heavy oil raw material is subjected to visbreaking treatment, and then the material is alternately subjected to hydrogenation reaction with different active catalysts in the inner barrel and the annular area along the flow channel arranged in the reactor, so that the problems of high activity and large temperature rise in the early stage of reaction can be controlled, and higher conversion rate in the middle stage of reaction is ensured; the deep cracking reaction in the later high-temperature stage of the reaction can be reduced, and the liquid yield is improved.

The present invention provides a direct coal liquefaction oil hydrogenation stabilization method which is as follows: hydrogen is fed by pores with a nano-sized average pore size into the direct coal liquefaction oil to obtain hydrogen-containing liquefied oil; and the hydrogen-containing liquefied oil is fed into a tubular fixed bed reactor in the upward-flow manner for contacting with a hydrogenation catalyst under liquid-phase hydrogenation conditions. Better hydrotreating results can be obtained, the direct coal liquefaction oil sulfur and nitrogen content and residual carbon content can be effectively reduced, polycyclic aromatic hydrocarbons in the direct coal liquefaction oil are partially hydrogenated, and gelatin and asphaltene content in the direct coal liquefaction oil can be reduced. The method needs no hydrogen cycle, the size of a hydrogenation reactor is reduced, the pressure rating of the gas-liquid separation unit is reduced, and investment costs and operating energy consumption are reduced. In addition, a hydrogenation raw material can carry a sufficient amount of hydrogen without introduction of diluent oil and / or circulating oil into the hydrogenation raw material, and the effective capacity of the hydrogenation reactor can be improved.