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287results about How to "Low reaction temperature" patented technology

Method for decomposing vanadium slag under normal pressure with sodium hydroxide solution

ActiveCN102127655ALow reaction temperatureHigh extraction rateProcess efficiency improvementSodium chromateCALCIUM HYDROXIDE SOLUTION
The invention relates to a method for extracting vanadium by decomposing vanadium slag under normal pressure with sodium hydroxide solution. The method comprises the following steps of: adding vanadium slag or preprocessed vanadium slag, water and NaOH into a normal pressure reactor, wherein the mass ratio of NaOH to the vanadium slag is (2-6): 1, and the mass concentration of the sodium hydroxide solution is 65-90wt%; oxidizing in the presence of an oxidizing gas at the temperature 180-260 DEG C for 0.5-6 hours, and then diluting the obtained reaction sizing agent with diluent, thus mixed sizing agent containing sodium hydroxide, sodium vanadate, sodium chromate and slag tailing is obtained; and filtering and separating the mixed sizing agent at the temperature of 80-130 DEG C, thus the slag tailing and aqueous solution containing vanadium are obtained. The method provided by the invention has the advantages that the operating temperature is below the boiling temperature of solution, the process can be carried out under normal pressure, the operation is easy, and the safety is good; and the operating temperature is far less than the operating temperature of the traditional vanadium extracting process, the extraction ratio of vanadium is high, and the total vanadium content in the slag tailing is 0.5-1wt% (taking the weight of V2O5 as the basis).
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Method for preparing catalyst capable of performing simultaneous desulfurization and denitrification on flue gas

The invention discloses a method for preparing a catalyst capable of performing simultaneous desulfurization and denitrification on flue gas. First deionized water is utilized to dissolve a precursor of active component Fe2O3 and a precursor of a promoter, and an active component precursor solution is obtained; a well weighed activated carbon carrier is steeped at room temperature for 10-12 h through the active component precursor solution; the well steeped activated carbon carrier is placed in a drying oven at 110 DEG C to be dried for 12 h and is roasted for 3-5 h at 450-550 DEG C under the nitrogen protection, so that nitrate in the precursors is decomposed into an oxide; the precursors are taken out to be cooled to room temperature, and the catalyst capable of performing simultaneous desulfurization and denitrification on flue gas is obtained. The catalyst prepared through the method is suitable for simultaneous desulfurization and denitrification. Moreover, by pretreatment through nitric acid, the adsorption capacity of the catalyst is enhanced, catalytic activation centers are increased, and the reaction temperature can be reduced by presulfurization.
Owner:BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY

Temperature-adjustable alkylation reactor and alkylation reaction method

ActiveCN104549109AImprove the mixing effectLow reaction temperatureLiquid hydrocarbon mixtures productionChemical/physical/physico-chemical nozzle-type rreactorsPhysicsEngineering
The invention discloses an alkylation reactor and an alkylation reaction method. The reactor comprises a reactor tube body, closure heads, a revolving bed, a charging pipe, a charge distribution pipe, a discharging opening, a circulating cooling gas inlet, a circulating cooling gas outlet and heat pipe elements, wherein a closed shell body is formed by the reactor tube body and the closure heads, the revolving bed is arranged at the internal middle part of the shell body and is connected with a driving device through a revolving shaft, the charge distribution pipe is arranged at the center of the revolving bed and is communicated with the charging pipe, and the discharging opening is formed in the lower part of the shell body; a sealing member is arranged between the revolving bed and the shell body, the heat pipe elements are arranged at the outer side of the revolving bed and sequentially penetrate through the sealing member and the shell body, the heat pipe elements outside the shell body are sealed with a jacket, a refrigerant inlet and a refrigerant outlet are formed in the jacket, and the circulating cooling gas inlet and the circulating cooling gas outlet are formed in the shell body. According to the alkylation reaction method disclosed by the invention, alkylation reaction is carried out by taking concentrated sulfuric acid as a catalyst and taking isobutane and alkene as raw materials. According to the alkylation reactor and the alkylation reaction method, the alkylation reaction can be carried out at low temperature, the acid consumption is low, and the equipment scale is small.
Owner:CHINA PETROLEUM & CHEM CORP +1

Transition metal composite oxides and preparation method thereof

InactiveCN101157483AShorten the timeLow reaction temperatureCobalt oxides/hydroxidesCalcium/strontium/barium oxides/hydroxidesIonChemistry
The invention discloses composite oxide of transition metal and the preparing method thereof, and relates to thermoelectric material and the preparing method thereof; the invention solves the problems of high reaction temperature, long reaction time and easy impurity production of the prior Ca-Co-O system preparing method. The general formula of the composite oxide is Ca2-xMxCo2O5, wherein, M refers to Na, Ag, La or Bi. The method contains the following procedures: firstly, dissolving Ca(NO3)2*4H2O and Co(NO3)2*6H2O or Ca(NO 3)2*4H2O, the nitrate of M and Co(NO3)2*6H2O respectively into deionized water and the mixing according to the stoichiometric ratio of the molecular formula, pouring slowing citric acid solution and performing ultrasonic oscillation to produce homogeneous sol; secondly, heating for dehydration with microwave to get wet sol; thirdly, drying the wet sol to get dry sol and allowing self-propagating combustion; fourthly, baking after grinding. Compared with the prior art, the invention has the advantages of short reaction time, low baking temperature and simple operation. The powder of the material of the invention has uniform particle distribution and high purity; the powder has flaky structure, and the particle diameter is smaller than 200nm; the prepared bulk material is compact and has relative density of more than 85 percent.
Owner:HARBIN INST OF TECH

Hydrothermal reaction method for manufacturing negative temperature coefficient heat-sensitive powder

InactiveCN101318814AUniform chemical compositionLow reaction temperatureNegative temperature coefficient thermistorsAmmonium hydroxideSol-gel
The invention relates to a method for preparing negative temperature coefficient heat-variable powder body-the method of hydro-thermal chemical reaction. De-ionized water is added into reaction raw materials of manganous salt, nickelous salt, cobaltous salt and magnesium salt, the mixture is stirred sufficiently; an ammonia solution is added into the stirred reaction solution until the pH value of the reaction solution is between 8.0 and 12.0; the reaction solution is put inside a high pressure reaction kettle to perform the hydro-thermal reaction and then is subject to washing and baking so that the negative temperature coefficient heat-variable nano powder material is produced; the negative temperature coefficient heat-variable nano powder material is put into a blind roaster to be pyrolyzed at a temperature of between 600 and 900 DEG C for 2 to 8 hours, and the negative temperature coefficient heat-variable powder material is produced after sufficient grinding process. Compared with the ball milling method, the coprecipitation method and the sol-gel method, the method has the characteristics that the chemical compositions are even, the reaction temperature is low, the productivity is high, the synthesizing cycle is short, the reaction condition is controlled easily, and the inevitable agglomeration phenomenon in the sintering process is reduced, etc.
Owner:CHINA JILIANG UNIV

Method for preparing nitrogen-doped molybdenum disulfide nanosheets by one-step method

The invention discloses a method for preparing nitrogen-doped molybdenum disulfide nanosheets by a one-step method. The method comprises the following steps: (1) weighing a certain amount of ammonium molybdate tetrahydrate, thiourea and urotropine, dispersing the weighed ammonium molybdate tetrahydrate, thiourea and urotropine in a vessel containing deionized water, and carrying out thorough dissolving and dispersing under the action of ultrasonics and magnetic stirring; (2) transferring the solution obtained in the step (1) into a teflon-lined reaction kettle, carrying out heating in an airblast drying oven for a chemical reaction, stopping heating after a period of time of reaction, and naturally cooling the reaction kettle to room temperature; (3) after cooling the reacted solution to room temperature, centrifuging the reacted solution, collecting a synthesized black substance, and carrying out repeated washing with a mixed solution of deionized water and anhydrous ethanol; (4) subjecting powder, obtained after washing in the step (3), to vacuum drying in a vacuum drying oven until the powder is constant in weight, thereby obtaining the nitrogen-doped molybdenum disulfide nanosheets. According to the method, the cheap urotropine is adopted as a nitrogen source, the reaction temperature is low, the operation is simple, the traditional complicated method is broken through, the yield is high, the catalytic activity is good, and the performance is stable.
Owner:HUAIBEI NORMAL UNIVERSITY
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