30results about How to "Reduce airspeed" patented technology

The present invention relates to method of recovering heat in hydrocarbon hydrogenating conversion process. The low temperature heat absorbing oil and the reaction resultant are heat exchanged to form high temperature heat absorbing oil, which enters to the bottom of the fractionating tower so as to mix with the liquid phase material flow inside the fractionating tower before being shunt into low temperature heat absorbing oil for reuse. The process is especially suitable for hydrogenating conversion of coal tar, and has the advantages of high heat utilizing rate, reduced hydrogen circulating system scale and reduced the scale of reboiling furnace in the fractionating tower. In addition, the heat absorbing oil heat exchanger may be used as the heater for starting the reactor or sulfurizing to reduce heat load of the heating furnace.

The invention relates to a catalyst for preparing pyromellitic dianhydride from durene through gaseous catalytic oxidation and a preparation method thereof, belonging to the technical field of catalytic oxidation. The catalyst is characterized by comprising V2O5, TiO2 and P2O5, wherein the molar ratio of V2O5 to TiO2 to P2O5 is 1:3.750-15.000:0.125-0.313. The catalyst provided by the invention has the advantages of low airspeed, low energy consumption, high selectivity and high weight gain percentage during application, is helpful to energy saving and resource consumption reduction and is beneficial to increasing the yield and the purity of pyromellitic dianhydride and reducing the production cost for preparing pyromellitic dianhydride through gaseous catalytic oxidation. The provided preparation method of the catalyst has simple and succinct technological steps and can ensure the overall embodiment of the effect of the catalyst.

A carried vanadium catalyst is prepared from activated carbon or gamma-Al2O3, vanadium and assistant through pulverizing activated carbon or gamma Al2O3 by 20-80 meshes, preparing the solutions of V precursor and assistant precursor, immersing for 18-36 hr, drying at 110-120 deg.c for 4-6 hrs, calcining at 450-650 deg.c for 4-5 hrs in nitrogen atmosphere and putting in drier. Its advantages are high transform rate of ethylbenzene (more than 60%) and high selectivity to styrene (more than 96%).

This invention is directed to a fluorine-containing mordenite catalyst and use thereof in the manufacture of alkylbenzene (LAB) by alkylation of benzene with an olefin. The olefin may have from about 10 to 14 carbons. The fluorine-containing mordenite is prepared typically by treatment with an aqueous hydrogen fluoride solution. The benzene alkylation may be conducted using reactive distillation. This invention is also directed to a process for production of LAB having a high 2-phenyl isomer content by use of the fluorine-containing mordenite in conjunction with a conventional solid LAB alkylation catalyst. The two catalysts may be used in a mixed catalyst bed or may be packed in series, with the relative proportions being adjusted to provide a desired 2-phenyl isomer content of in the final product.

A flight control and engine control function for a multi-engine aircraft which automatically controls maximum thrust on the operating engine to a value lower than the nominal thrust limit schedule in the event of loss of thrust on another engine. The maximum engine thrust of the operating engine is controlled (limited) such that the resulting thrust asymmetry can be controlled at airspeeds lower than would otherwise be the case. The decrease in engine-out minimum control speed can reduce the limitation on landing speeds that would otherwise be caused by engine-out minimum control speed.

The invention discloses an inter-section high low temperature gradient alcohol-division two-stage alcohol generation method which comprises the following steps: respectively reheating fresh synthesis gas and recycle gas, mixing the fresh synthesis gas with the recycle gas, introducing the mixed gas into a first reactor, and enabling part of carbon oxides to react to obtain methyl alcohol; cooling a mixture containing synthesis gas and methyl alcohol steam output from the first reactor, guiding the mixture to flow to a first methyl alcohol separator, separating out methyl alcohol, pressurizing the separated gas, preheating, then introducing into a second reactor, and enabling part of carbon oxides to react to obtain methyl alcohol; cooling a mixture containing synthesis gas and methyl alcohol steam output from the second reactor, guiding the mixture to flow to a second methyl alcohol separator, separating out methyl alcohol, preheating the separated gas which separately serves as the recycle gas and fresh synthesis gas, mixing the recycle gas and the fresh synthesis gas, and feeding the mixture into the first reactor so as to perform next round of circulating preparation of methyl alcohol. The invention further discloses an inter-section high low temperature gradient alcohol-division two-stage alcohol generation device. The method is relatively high in single-pass alcohol net value and relatively small in circulation ratio, achieves a ton-alcohol steam yield as high as 1.2-1.3 ton, and is high in energy heat recovery amount.

The invention relates to bacillus licheniformis, a method for preparing a flocculating agent from the bacillus licheniformis and an application of the flocculating agent. The strain is bacillus licheniformis LZ-1 which is preserved in China General Microbiological Culture Collection Center on November 06, 2012 with preservation number of CGMCC No.6782. With the application of the bacillus licheniformis LZ-1 as well as a production method provided by the invention, a fermentation broth, which is high in flocculating activity, is obtained under the condition that an initial pH value is alkaline, and high-molecular-weight polysaccharide, which is 0.8-3.2*10<7>Da, serves as a major flocculating active ingredient. The polysaccharide flocculating agent provided by the invention has the advantages of being high in flocculating activity, low in dosage, low in production cost and the like, and the flocculating agent has a flocculating conditioning effect on sludge. The bacillus licheniformis LZ-1 fermentation broth or a product, which is extracted from the fermentation broth and contains the polysaccharide flocculating agent, can be applied to deep dewatering by sludge plate-frame pressure filtration in a mode of replacing a polyacrylamide flocculating agent, so that sewage treatment plant concentrated sludge, which is 96-98% in moisture content, is further dewatered into a sludge cake which is lower than 60% in moisture content and the size of the sludge is diminished to be 1/20-1/10 of an original size.

The invention discloses an endothermic aviation fuel. According to the endothermic aviation fuel, a flashing point is higher than 60 DEG C, a fuel net heating value is larger than 43.0 MJ/kg, a heat sink at 750 DEG C is larger than or equal to 3.4 MJ/kg, and the thermal stability passes a JFTOT test at 355 DEG C in 300 minutes; the aviation fuel is prepared from larger than or equal to 30wt% of alkane and larger than or equal to 50wt% of cyclane, the aromatic hydrocarbon content is less than 5wt%, a bromine number is 0, and the sulphur content is less than 1 ppm. The endothermic aviation fuelhas the characters of high thermal stability, high heat value, low volatility, high heat sink and better anti-coking performance; after a compound additive is added, the performance of the aviation fuel can be further improved, especially, the anti-coking performance of the fuel at high temperatures is obviously improved.

The present invention is externally heated medium and high pressure process and apparatus for synthesizing material ammonia gas with methanol and methane. The apparatus includes medium pressure combined methanol synthesizing apparatus with serially and parallelly connected towers; high pressure methanolizing apparatus comprising oil separator, water cooler and high efficiency methanol separator; and externally heated high pressure methanating apparatus comprising methanating tower, heat exchanger outside the tower, steam heater, water cooler, ammonia cooler and gas-water separator. The apparatus has the advantages of high alcohol/ammonia ratio, complete refining of synthesized material ammonia gas, low CH4 in produced inert gas, low heat consumption, etc.

This patent application discloses engineering design modifications to the VSS exit, stripper entrance and the primary cyclone diplegs that can significantly reduce the underflow of reactor riser products into the stripper and reactor vessel and thereby produce higher desired product selectivities, improved stripping efficiency and a stripper vent gas, that continuously flows through the reactor vessel, with a low coke forming potential due to its low concentration of ethylene and higher molecular weight material, that could, if desired, be recovered separately from the primary riser products.

The invention relates to a method for preparing 4-hexene-3-ketone by 4-hydroxy-3-hexanone dehydration, which mainly solves the problems of low activity of a catalyst, high reaction temperature, and low space velocity in the prior art. Aiming at well solving the problems, the method adopts the technical scheme that the 4-hydroxy-3-hexanone is used as a raw material, and the reaction raw material comes into contact with the catalyst to generate the 4-hexene-3-ketone when the reaction temperature is 200 to 400 DEG C and the liquid weight hourly space velocity is 0.5 to 15 h<-1> relative to the 4-hydroxy-3-hexanone; and the catalyst is a mesoporous/macroporous silica and alumina oxide material with a composite pore structure The method can be used for the industrial production of the 4-hexene-3-ketone prepared by the 4-hydroxy-3-hexanone.

The invention discloses equipment for low-temperature methanol double washing based on heat exchange and modified methanol. The equipment comprises a process gas absorption tower, a flash tower, a CO2 desorption tower, an H2S concentration tower, a methanol regeneration tower, a methanol-water separation tower and a tail gas water washing tower; the flash tower and the CO2 desorption tower are respectively connected with the process gas absorption tower, the H2S concentration tower and the methanol regeneration tower are respectively connected with the flash tower, the methanol-water separation tower is connected with the methanol regeneration tower, and the tail gas washing tower is connected with the H2S concentration tower; CO2 gas and a methanol-rich solution in raw material gas are separated out by utilizing the process gas absorption tower, CO2 gas is resolved out by utilizing the CO2 desportion tower, H2S gas in the methanol-rich solution is flashed out by utilizing the flash tower, a methanol-poor solution after flash evaporation sequentially passes through the methanol regeneration tower and the methanol-water separation tower, and tail gas overflowing from the top of the H2S concentration tower is discharged after being washed by the tail gas washing tower; and the equipment is reasonable in structural design, the methanol consumption is reduced by adjusting the methanol recycling process, and the production cost is saved.

Methods and systems are provided for generating an alert for an aircraft potentially exceeding speed limits in airspace with speed limitations. The method comprises retrieving a flight plan for the aircraft and identifying airspace with speed limitations along the flight plan. A speed profile is generated based on the in-flight aircraft's current position, speed and trajectory. Any predicted speed violations are identified by comparing the speed profile with the airspace with speed limitations along the flight plan. A predictive time window is calculated that allows for the in-flight aircraft to decelerate sufficiently to comply with the speed limits of the airspace with speed limitations. The predictive time window includes a zone for the aircraft to reduce its airspeed and a reaction buffer zone to allow the aircrew sufficient time to comply with instructions to decelerate the aircraft. Finally, an alert is generated for the crew of the in-flight aircraft upon entering the predictive time window.

The present invention relates to a method of 4-hydroxy-3-hexanone catalytic dehydration, and mainly solves the problem of low catalyst activity, high reaction temperature and low space velocity in the prior art. According to the invention, 4-hydroxy-3-hexanone is used as a raw material, and the reaction raw material is in contact with a catalyst to produce 4-hexen-3-one at the conditions of a reaction temperature of 200-400 DEG C and the space velocity of 0.5-15 hr-1 with respect to the mass of 4-hydroxy-3-hexanone liquid, wherein the catalyst is at least one selected from the group consisting of Al-MCM-41, Al-MCM-48, Al-SBA-15, Al-HMS, Al-MSU-1 or Al-MSU-2. The technical solution solves the problem preferably. The method can be used in the industrial production of 4-hexen-3-one from 4-hydroxy-3-hexanone.