779results about How to "Improve conversion rate" patented technology

A system and method for dynamically generating a web page is disclosed. The web page includes a frame having content cells. Content for the content cells is provided based in part on business rules. A business rules engine processes, in real-time, an online interaction and determines appropriate content for the content cells. The business rules engine outputs a pointer to the content which is used to populate the content cell.

The invention provides a novel methane catalyst and a preparation method thereof, which is characterized in that by adding rare earth elements of La and Ce during the process of the catalyst, the activity and selectivity of the catalyst are improved, and especially for the reaction that CO2 is carried out hydrogenation to be changed into methane, the conversion rate is higher. By adding an appropriate amount of Ca, Mg, Ba, Na and other alkali metals and alkaline earth metals, the thermal stability and the anti-carbon property of the catalyst are improved. The components of the catalyst by weight percentage are as follows: 70-86% ofAl2O3, 12-20% NiO, 0.5-5% of La2O3, 0.5-5% of MgO, 0.1-5% of CeO2, 0.1-3% of CaO, 0.1-1% of Na2O and 0.01-2% of BaO; the specific surface of the catalyst is 100-180m<2>/g, and the pore volume is 0.4- 0.8ml/g.

The invention discloses breeding for efficiently converting L-glutamate into gamma-amino butyric acid lactobacillus strains, and belongs to the technical field of fermentation in bioengineering. The strains screened by the invention are classified and named as Lactobacillus plantarum GB 01-21 and collected in CCTCC with a collection number of CCTCCM 209102. A lactobacillus strain capable of producing gamma-amino butyric acid by using the L-glutamate is screened from homemade pickle, named as LP-GB 01 and taken as an original strain; and a positive mutant is obtained by screening after ultraviolet mutation and named as LP-GB 01-21. A preliminary conversion experiment is performed in a 100mL triangular flask; and after the conversion is stopped, the gamma-amino butyric acid in the conversion solution is measured by using an amino acid measurement instrument, wherein the concentration of the gamma-amino butyric acid is 51.9g/L and the molar conversion rate reaches 92.7 percent. When an amplified conversion experiment is performed in a 5L fermentation tank, the concentration of the finally obtained gamma-amino butyric acid is 132g/L, and the molar conversion rate is 94.3 percent. The microbial method provides basis for producing industrialized production of the gamma-amino butyric acid.

The invention discloses a device and method to prepare aniline by the nitrobenzene gas phase hydrogenization, and the device mainly includes a fluidized bed reactor set at the raw material gas inlet at the bottom of the reactor, a first gas distributor on the top of the gas inlet, a second gas distributor separating the reactor in the middle of axial height of the reactor into two catalyst dense phase regions, and heat exchangers in two catalyst dense phase regions; catalyst overflow device connected with two catalyst dense phase regions and gas-solid separator. It also discloses a method to prepare aniline by the device, mainly including: the steps of controlling the mol ratio of hydrogen gas to nitrobenzene, controlling the temperature in two catalyst dense phase regions, etc. It has advantages of large reactor operation flexibility, high nitrobenzene conversion, high aniline production selectivity, high product purity, etc.

The invention relates to a method for synthesizing ultrafine calcium carbonate by utilizing carbide slag. The method comprises the following steps of: (1) dissolving carbide slag: uniformly mixing carbide slag with water in a ratio of (1:6)-(1:20) to ensure that the carbide slag is fully dissolved into a turbid liquid, wherein the water content of the carbide slag is 20-45%; (2) carrying out impregnation reaction: adding ammonium chloride into the turbid liquid of the carbide slag for uniformly mixing, wherein the mass ratio of carbide slag to ammonium chloride is (1:0.7)-(1:2.5), after the impregnation reaction is finished, filtering and removing the slag to obtain a clear calcium chloride solution; and (3) carrying out carbonization reaction: adding a crystal form control agent into a calcium chloride solution for fully dissolving, introducing CO2 into the solution to carry out carbonization reaction till the pH (potential of Hydrogen) value of the reaction solution is less than or equal to 7 to obtain ultrafine calcium carbonate slurry, wherein the crystal form control agent is one or more than two mixtures of sulfate, chloride, citrate, sodium dodecyl benzene sulfonate, pyrophosphate, oleic acid, ammonium citrate, N-methyl pyrrolidone and maleic acid.

The invention relates to an imidazole grafting-type ionic liquid catalyst, which is hydroxide of 1-propyl (triethoxysilyl)-3-methylimidazole grafted on a carrier. The representation formula of the imidazole grafting-type ionic liquid catalyst is [Smim]OH/X and a mass grafting amount of ionic liquid is between 5 and 25 percent, wherein Smim represents 1-propyl (triethoxysilyl)-3-methylimidazole; and X represents the meso-porous carrier. The imidazole grafting-type ionic liquid catalyst has the advantages of good catalytic effect, high conversion rate of propylene oxide, 100 percent of selectivity of propene carbonate, mild reaction condition and capability of being recycled better.

The process of preparing biological diesel oil with palm oil includes the steps of: hydrating and degumming coarse palm oil, distilling to eliminating acid, dewatering, adding low carbon alcohol and catalyst for ester exchange reaction to obtain coarse biological diesel oil and coarse glycerin, evaporating to separate out low carbon alcohol and to obtain biological diesel oil and glycerin as side product, and recovering the evaporated low carbon alcohol for reuse. The present invention has abundant material source, low cost, high biological diesel oil converting rate and yield, simple technological process and less environmental pollution.

The invention discloses a toluene liquid-phase selective oxidation catalyst and a preparation method thereof. The catalyst is transition metal or rare earth vanadate which has the composition shown by MexVyO, wherein Me is one of transition metals of VIB, VIIB or VIIIB group; V is vanadium; and the molar ratio x/y of Me to V is 0.1 to 10. The catalyst provided by the invention can be used for toluene liquid-phase oxidation reaction, the conversion rate of the toluene is high and the main product is benzaldehyde; by changing the composition and modulating reaction conditions of the catalyst, the proportion of the benzaldehyde to benzoic acid in the product can be changed; the catalyst does not pollute equipment and environment; and a solved used in the reaction can be recovered and rational resource utilization is basically realized.

The invention relates to a preparation method of hydrogel and aims at providing a preparation method of novel double-network hydrogel with high water absorption and high strength. The preparation method comprises the following steps: firstly, a first network monomer, a cross-linking agent, a dispersion medium and an initiator are dissolved in water, and a solution is poured into a silica gel sheet mould, irradiated under strong ultraviolet radiation, stood and cooled; gel is taken out of the mould, put into a water solution containing a second network monomer, a cross-linking agent and an initiator, swollen until balancing, and then taken out to carry out weak ultraviolet radiation so as to obtain the double-network hydrogel with high water absorption and high strength. The invention has simple preparation process and can quickly obtain the double-network hydrogel with superior performance and high water absorptivity. The hydrogel has very good water absorbing capacity and superior mechanical property and can bear external force well. The hydrogel can be widely applied to the field of biomedicine comprising medicine wrapping, medicine slow-controlled release, artificial eye cornea, burn protective films and articular cartilage restoration and replacement and also has potential application value in the field of the light industry.

The invention provides a ruthenium catalyst for synthesizing tetrahydrofurfuryl alcohol in one-step hydrogenation of furfural. The expression of the ruthenium catalyst is Ru-M/TiO2, wherein Ru accounts for 0.5-15 wt% of the catalyst; and M is a metal auxiliary and accounts for 0-20 wt% of the catalyst. A preparation method of the ruthenium catalyst comprises the following steps of: adding a carrier TiO2 into a water solution containing ruthenium salt or a water solution containing ruthenium salt and metal auxiliary salt such that the weight ratio of ruthenium to carrier is 0.005-0.15:1; and then, adding 2-10 wt% of potassium borohydride or hydrazine hydrate solution to precipitate the solution. A nonionic surfactant is optimally added in the preparation method to improve the catalytic activity and selectivity. If the catalyst is subject to hydro-thermal treatment in a water solution of sodium sulfate, then the adsorption property of the catalyst can be changed, and the selectivity of catalyzing furfural to synthesize tetrahydrofurfuryl alcohol through one-step hydrogenation can be greatly improved. The catalyst has simple preparation method, good catalytic activity and high selectivity and is especially applicable to catalyzing the reaction of furfural to synthesize tetrahydrofurfuryl alcohol through one-step hydrogenation under the conditions of low temperature, low pressure and no solvent. Under certain reaction conditions, the yield of tetrahydrofurfuryl alcohol can reach more than 99%.

The invention discloses a new clean method for producing xylitol and arabinose; the method originally utilizes xylose mother liquor as raw material, improves the fermentation process and the separation and purification process by pretreatment of the xylose mother liquor, fermentation, separation of fermented fluid thalli, fermentation pre-treatment, nanofiltration, concentration, chromatographic separation of a simulated moving bed, concentration and crystallization, and the like, shortens the fermentation time, lowers the production cost, greatly reduces the discharge amount of sewage, and increases the conversion rate of xylitol and the yield rate of arabinose; the purity of the xylitol and the arabinose which are obtained by utilizing the method can respectively reach more than 99.9 percent and 99 percent; and the yield rate of xylitol and arabinose is improved greatly, thereby creating an effective clean pollution-free industrial road for the production of xylitol and arabinose.

The invention discloses a method for recycling lead plaster from a waste lead storage battery. The method is implemented by the following steps of: (1) crushing the lead plaster separated from the waste lead storage battery into particle sizes of 160 to 220 meshes; (2) adding the crushed lead plaster into saturated solution of NH4HCO3, reacting the lead plaster with the solution of NH4HCO3 under stirring to convert lead sulfate in the lead plaster into lead carbonate, and stopping reaction; (3) performing suction filtration, washing a filter cake to be neutral by using distilled water to obtain a wet product, placing the wet product into a drying oven for drying under the condition of 150 DEG C to obtain a sample, and adding NH4HCO3 into filtrate until the mixed solution is saturated for the treatment of lead plaster of the next batch; and (4) heating the sample obtained by the step (3) to 250 to 350 DEG C, preserving heat for 1 to 1.5h to completely dissolve lead dioxide into lead oxide, heating the sample to 350 to 450 DEG C, and preserving the heat for 3 to 4h to completely dissolve the lead carbonate to obtain yellow lead.

The invention provides a nano-selenium cabbage nutritional agent which is prepared by evenly mixing a nano-selenium plant nutritional agent, an organic fertilizer and a microbial fertilizer according to the weight ratio of 1 to 9: 2 to 4: 0.3 to 0.5. The invention also provides a method for producing the selenium-enriched cabbages by utilizing the nano-selenium cabbage nutritional agent, comprising the following steps of: applying the nano-selenium cabbage nutritional agent according to the application amount of 5 to 25kg/acre in a furrow application way in the cabbage planting process so as to enable the nutritional agent to leave in 5 to 10cm of a plough layer; dynamically monitoring the selenium enriching effect of the cabbages; and culturing the cabbages for more than 50 days and then harvesting the selenium-enriched cabbages with the selenium content of 10 to 100Mug/kg. The cabbages produced by the production method have good security, and the selenium in the cabbages is easy to absorb and utilize.

The invention provides a synthesis method for dehydrating biological ethanol to prepare ethylene, belongs to the technical field of the synthesis chemical project and relates to a preparation of the ethylene. The invention provides a method for dehydrating the biological ethanol to prepare the ethylene under the function of a nanometer molecular sieve catalyst. Under the normal pressure and in a certain temperature range, a fixed bed reactor which uses the nanometer molecular sieve as the catalyst and uses the liquid biological ethanol as a raw material, and while the inertia gas is used for adjusting the partial pressure of the gas ethanol in the preheating section of the reactor, the desorption of the generated ethylene from the catalyst is strengthened so as to achieve the aim of efficiently dehydrating and synthesizing the ethylene by the ethanol. The synthesis method of dehydrating the biological ethanol to prepare the ethylene of the invention is outstandingly characterized in that: (1) the nanometer molecular sieve is applied in dehydrating the biological ethanol to prepare the ethylene; (2) while the inertia gas is used for adjusting the partial pressure of the gas ethanol, the desorption of the generated ethylene from the catalyst is strengthened; (3) the catalyst is good in stability, reaction is low in temperature, ethanol is high in conversion, ethylene is high in selectivity, environment is not polluted and the process is simple. A nanometer HZSM-5 molecular sieve is used as the catalyst, and 95(v/v) percent of liquid ethanol is used as the raw material (the ethanol weight space velocity is 1.2 hours<-1>), the nitrogen is used for adjusting the partial pressure of the gas ethanol in the preheating section of the reactor, the ethanol conversion is more than 99 percent and the ethylene selectivity is more than 98 percent in the reaction time of 600 hours under the reaction temperature of 240 DEG C.

A process for preparing the carbide of transition metal includes such steps as putting carbon in crucible, covering it by assistant and transition metal, heating to 600-1300 deg.C at 0.1-30 deg.C/min under protection of Ar gas or in vacuum, holding the temp for 0.1-200 hr, cooling, boiling the crucible in water, taking the carbide, water washing and drying.

Production of polyisoprene water latex, its gloves and related products is carried out by polymerization reacting for isoprene monomer, emulsifying agent and evocating agent by emulsion free-radical at normal-temperature and pressure or mixing polyisoprene water latex with other synthetic polymer. It has excellent strength and extensibility.

A catalytic conversion method for processing a high-nitrogen raw material is characterized in that a regenerated catalyst having a lower temperature enters the pre-lift section of a reactor, upward flows under the action of a pre-lift medium, enters a first reaction zone, contacts with the high-nitrogen raw material, adsorbs and reacts at the lower portion of the first reaction zone, and upward flows; the formed oil agent mixture enters a second reaction zone, contacts with a regenerated catalyst having a higher temperature in the second reaction zone, and continuously and fully reacts; and the oil agent mixture from the second reaction zone goes through the outlet of the reactor and undergoes gas-liquid separation, the carbon-containing catalyst obtained after the separation is stripped, scorched and regenerated for cycle use, and the separated reaction oil gas is sent to a subsequent product separating system. The method can be used to directly process the high-nitrogen raw material, and improves the conversion rate of the high-nitrogen raw material. The method is simple to operate, and a routine catalytic cracking device can be simply reconstructed to carry out the operation of the method. Gasoline produced through the method has a low olefin content.

The invention relates to technology for preparing biogas by degrading coal with microorganisms. The technology is suitable for any environment with oxygen or without oxygen. Under the condition of room temperature (15 to 35 DEG C), biologic methane can be ensured to be continuously generated without activating a strain in a way of raising temperature, so the development cost is effectively reduced; the adopted white-rot fungi is highly adaptive to the environment and is low in cost, so the technology has the feasibility of project development; and different types of colonies can be more effectively used and the effect of the colonies can be improved, so the degradation rate of a coal body is increased, and the yield of biological methane is improved.

The invention relates to a catalyst for preparing 1,3-propanediol by hydrogenolysis of glycerin as well as a preparation method thereof. The catalyst comprises a tungsten oxide-aluminum oxide (WO3-Al2O3) composite carrier and active components which comprise any one selected from ruthenium, rhodium, palladium, iridium and platinum (marked as A) and any one selected from gold, silver, copper, nickel, sodium oxide, lithium oxide, potassium oxide, magnesium oxide, gallium oxide, zinc oxide, iron oxide, molybdenum oxide, lanthanum oxide, zirconium oxide, cobalt oxide, rhenium oxide, tin oxide, and manganese oxide (marked as a component B). The prepared catalyst can be used for generating 1,3-propanediol by hydrogenolysis of glycerin at a certain hydrogen pressure and temperature with high conversion rate and high selectivity.

The invention discloses a nickel-based catalyst for preparing isopropyl alcohol by acetone hydrogenation and application thereof. In order to solve the problem of non-desired catalyst application in the prior art for preparing isopropyl alcohol by acetone hydrogenation, in the invention, a small quantity of metals Mo and Zn are added into the nickel-based catalyst so as to obviously improve the yield coefficient of the catalyst for preparing the isopropyl alcohol by acetone hydrogenation; a test for simulating industrial production conditions and a catalyst comparison test are carried out, and the test result shows that the yield coefficient of the isopropyl alcohol can reach 99.4% by adopting the catalyst of the invention at a certain temperature and pressure. Compared with the traditional nickel-based catalyst, and the content of the main active component nickel is reduced, therefore, the production cost of the catalyst is effectively reduced.

The invention discloses a solid flaky polycarboxylate water-reducer and a polymerization preparation method thereof. The polymerization preparation method comprises the following specific steps: placing 850 to 890 parts of polyether macro-monomer in a reaction kettle without adding water or any organic solvent, and heating to 65 to 75 DEG C; stirring until the polyether macro-monomer is dissolved completely, keeping the temperature at 65 to 75 DEG C, putting 5 to 10 parts of weak chain transferring agent, 2.5 to 5.0 parts of organic peroxide initiator, 7.5 to 12.5 parts of unsaturated dicarboxylic acid and 25 to 40 parts of acrylic acid at a time; after the materials are added at a time, starting to dropwise add a mixed solution of 50 to 80 parts of acrylic acid and 1.2 to 3.5 parts of strong chain transferring agent, and adding an azoic initiator at two times in the dropwise adding process; after finishing the dropwise adding, curing for 1 to 2 hours, adding 7.5 to 16.0 parts of neutralizing agent, stirring uniformly, and slicing after cooling to obtain a finished product. The solid flaky polycarboxylate water-reducer is convenient to store, is low in long-distance transportation cost, is completely water-soluble, and is suitable for cement-based binding materials in civil engineering.

The invention relates to an acrylic acid catalyst prepared by acrolein oxidation and a preparation method thereof, and mainly solves problems of low reaction yield and selectivity of a catalyst in a prior art. According to the invention, a carrier is at least one selected from SiO2, Al2O3 and TiO2; a catalyst contains an active component expressed by a following general formula: Mo12VaXbYcZdQeOx; X is at least one selected from W, Cr and Nb; Y is at least one selected from Cu, Fe, Ni, Co and Mn; Z is least one selected from Sb and Bi; Q is least one selected from Li, Na, K, Rb, Cs, Mg, Ca and Sr; an organic template like ethene diamine is added during a catalyst preparation process to guide catalyst pore structure. The above technical scheme well solves the problems and can be applied to industrial production of acrylic acid through acrolein oxidation.

The invention discloses a method for producing organic selenium-enriched rice, wherein the organic selenium-enriched rice is planted according to a normal rice cultivation method. The method is characterized in that the method comprises the steps of: carrying out root dipping treatment to rice seedlings by using selenium-enriched nutrient before transplanting the rice seedlings, transplanting therice seedlings into a big field, planting according to a conventional rice planting method, harvesting organic selenium-enriched paddy, and processing the organic selenium-enriched paddy to obtain the organic selenium-enriched rice. The selenium-enriched nutrient comprises substances with effective application dose, wherein the substances contain selenium and potassium sulfate,. The selenium content of the rice, obtained by the method, is 50-300mug/kg and is improved by 2-10 times in comparison with that of common rice, organic selenium ratio is greater than or equal to 80% and the standard of the organic selenium-enriched rice is achieved.

The invention discloses a propane dehydrogenation catalyst, which is obtained by loading metal platinum on magnesium aluminate spinel carriers, wherein the metal platinum of the catalyst is in a one-dimensional or two-dimensional highly dispersed state on the surface of the carrier; platinum atoms exist in a single atom or sub-nanometer cluster form; the particle diameter of the sub-nanometer cluster is smaller than 1nm. The invention also discloses a preparation method of the propane dehydrogenation catalyst. Compared with a catalyst prepared by the existing method, the obtained propane dehydrogenation catalyst has the advantages that the conversion rate and the selectivity are obviously improved; the stability is high; good application prospects are realized.

The invention provides an application of nanometer molecular screen in aromatic hydrocarbons alkylation reaction, and a method for generating mono-substituted, disubstituted and polysubstituted benzene by alkylation reaction of aromatic hydrocarbons with olefin hydrocarbon or alcohol on molecular sieve catalyst, wherein aromatic hydrocarbons is benzene, toluol, ethylbenzene or cumene; olefin hydrocarbon is ethylene, propone, butene or isobutene; alcohol is C1 to C4 aliphatic alcohol; molecular screen is high high crystallinity sheet MCM-22, MCM-49 or MCM-56 crystal powder in which the thickness is smaller than 50nm, and sizes is between 300 and 500nm.The nanometer molecular sieve catalyst provided in present invention has high conversion rate of alkylation reaction and high selectivity, and it has fine stability, which is capable of being used for manufacturing production.

The invention relates to a preparing method of a sodium-ion battery cathode material, and particularly relates to a preparing method of a manganese-based sodium cathode material. The preparing method includes mixing a sodium-containing compound and a manganese-containing compound according to a ratio that the molar ratio of Na to Mn is larger than 1; sintering at 600-1000 DEG C for 6-20 h; cooling to the room temperature to obtain a sintered product; smashing the sintered product; performing washing/solid liquid separation repeatedly for a plurality of times; and drying to obtain a final product. According to the method, the excess sodium-containing compound is adopted to increase the solid phase reaction speed between the sodium-containing compound and the manganese-containing compound and to increase the conversion rate. Modification of an alkaline intermediate is utilized to enhance the electrochemical activity of the product. Excess sodium-containing by-products after the reaction is finished can be removed in the washing/solid liquid separation step.

The invention relates to a preparation method for propylene epoxidation catalyst, which solves the questions that the propylene epoxidation catalyst is easy to produce other titanium outside the skeleton in the former technology, reducing the use rate of ultra-oxygen compound, reducing the relatively content of component with active titanium in the activator in the molding process, covering titanium active center, and reducing effect of activator. The invention uses molding oxidation silicon as carrier then putting titanium into the organic solvent; lastly adopting the scheme about water vapour and organic silicon to solve the problem, which can be used in epoxypropane propane industrial production.

The invention relates to an incentive video advertisement intelligent delivery method, which comprises the following steps: establishing a user database, and obtaining user data; performing standardization processing on the user data; portraying user crowd portraits, and matching a plurality of crowd attribute tags for each user; dividing the target crowd into a core crowd, a strongly related crowd and a radiation crowd; establishing a CTR prediction model, and carrying out click rate estimation; performing basic evaluation on the core crowd, the strongly related crowd and the radiation crowdaccording to the predicted click rate, and performing real-time adjustment according to the transaction condition; carrying out advertisement putting processing through basic evaluation, and completing advertisement putting display and reproduction processing by locking accurate putting of the target crowd. According to the method, personalized advertisement putting strategies are customized for different users, personalized accurate putting and maximum traffic variation of the internet advertisements are achieved, resource and cost waste brought to enterprises and advertisers due to non-objective putting is avoided, and the optimal marketing effect is achieved through a small number of resources.

The invention discloses a catalyst applicable to synthesis of methanol by multi-component mixed gas. The methanol catalyst comprises the following components in percentage by mass: 25%-65% of CuO, 20%-40% of ZnO, 15%-35% of Al2O3 and 0-5% of an aid M, wherein the aid M is one or a mixture of more of Zr, Si, La, Mn, Ce, Cr and Ti oxides. Besides, the invention further discloses a preparation method and application of the methanol catalyst. The methanol catalyst has the beneficial effects that the preparation process is simple, the repeatability is good, and the industrial large-scale production is easily realized; the methanol catalyst has the characteristics of being high in specific surface area, easy to form, high in mechanical strength after forming, applicable to multi-component mixed gas of different proportions, high in conversion rate of carbon dioxide and selectivity of methanol and small in generation rate of by-products; by adjusting the constitution proportion of the multi-component mixed gas, the heat release intensity of the catalyst can be adjusted, and therefore, the balance between heat release and heat transfer capacity is achieved, so that the operation stability of the catalyst is achieved, and the service life of the catalyst is prolonged.

The invention relates to a catalyst for preparation of methanol by carbon dioxide hydrogenation, a preparation method thereof and a methanol synthesis method, and mainly solves the problem of low activity of catalysts for preparation of methanol by carbon dioxide hydrogenation in the prior art. According to a technical scheme, the catalyst for preparation of methanol by carbon dioxide hydrogenation comprises the following components by mass: (1) 85-99 parts of a carrier; and (2) 1-15 parts of at least one active element selected from Pd, Pt or Cu. The catalyst provided by the invention well solves the problem, and can be used in the industrial production of methanol.