125results about How to "For subsequent separation" patented technology

The invention relates to methods for fabricating a semiconductor substrate. In one embodiment, the method includes transferring a seed layer on to a support substrate; and depositing a working layer on the seed layer to form a composite substrate. The seed layer is made of a material that accommodates thermal expansion of the support substrate and of the working layer. In another embodiment, the method includes providing a source substrate with a weakened zone defining a nucleation layer, bonding a support substrate to the source substrate, detaching the nucleation layer and support substrate at the weakened zone by applying laser irradiation stress, depositing a semiconductor material upon the nucleation layer, bonding a target substrate to the deposited layer and removing the support substrate and nucleation layer. The result is a semiconductor substrate that includes the layer of semiconductor material on a support or target substrate.

The invention discloses a 2,2,6,6,-tetramethyl-4-piperidone continuous synthesis method. The 2,2,6,6,-tetramethyl-4-piperidone continuous synthesis method comprises the following steps of 1, filling an acidic resin into a fixed bed reactor, and carrying out heating so that a temperature of the fixed bed reactor is in a range of 40 to 70 DEG C, and 2, feeding acetone and ammonia gas into the fixed bed reactor according to a mole ratio of 3-9: 1 under the conditions of acetone hourly space velocity of 0.15 to 1.17h<-1> and ammonia gas hourly space velocity of 5.25 to 124.20h<-1>, and cooling the product to obtain a 2,2,6,6,-tetramethyl-4-piperidone crude product. The 2,2,6,6,-tetramethyl-4-piperidone continuous synthesis method has simple processes and a low cost, is suitable for industrial continuous production, does not adopt an organic solvent or water as a solvent, avoids the pollution produced by the organic solvent on the environment, has mild reaction conditions, can be carried out at a temperature of 40 to 70 DEG C, has low energy consumption, and avoids the influence caused by impurities produced at a high temperature on the product.

The invention belongs to the technical field of functional material preparation, and particularly relates to a preparation method of a molecularly imprinted composite membrane for selectively separating tetracycline. The preparation method comprises the following steps: preparing a basement membrane from cellulose acetate and chitosan; preparing the tetracycline molecularly imprinted composite membrane by taking biomass nano activated carbon as a doping material, tetracycline as a template, acrylamide and methacrylic acid as functional monomers, ethylene glycol dimethacrylate as a cross-linking agent and azodiisobutyronitrile as an initiator and combining nano material doping technology and molecularly imprinted polymerization technology. Based on a biomass material synthesis strategy andin combination with the doping of biomass nano activated carbon and the synergistic effect of a bifunctional monomer, the prepared material has the advantages of high flux and strong selective adsorption capacity, so that the separation efficiency of the material on tetracycline in a complex mixed system is greatly improved; in addition, since the base membrane raw material of the molecularly imprinted membrane is a biomass and renewable material, the molecularly imprinted membrane has good biodegradability.

The invention discloses a concrete crushing device with a metal part recovery function. The concrete crushing device comprises a box body. The top of the box body communicates with a feeding hopper. Symmetric crushing rollers are arranged at the position, located below the feeding hopper, in the box body. A grinding roller is arranged below the crushing rollers, and the outer side of the grindingroller is sleeved with a grinding cover. According to the concrete crushing device, the symmetric crushing rollers are arranged, large concrete is fast crushed, meanwhile, metal parts are exposed, andsubsequent separation is facilitated; and the concrete crushing device is provided with the grinding roller and the grinding cover with screen holes, concrete blocks are extruded and crushed, the metal parts are separated from crushing residues, the metal parts and the concrete crushing residues are screened and finally separated through a screen plate vibrating up and down, and concrete block efficient crushing and metal part recycling are achieved.

The invention relates to a process for the production of ammonia from synthesis gas, the synthesis of ammonia from synthesis gas taking place in several lined-up synthesis systems, whereby ammonia is produced from a portion of the synthesis gas in each system with a part-stream being withdrawn and the respective downstream synthesis system being operated at a higher pressure than the respective upstream synthesis system.

The invention belongs to the technical field of functional material preparation, and specifically relates to an emodin molecular imprinted titanium dioxide nanoparticle composite film and a preparation method and application thereof. The emodin molecular imprinted titanium dioxide nanoparticle composite film is prepared by taking a cellulose acetate membrane as a basement membrane, emodin as template molecules, dopamine as a functional monomer and a crosslinking agent and combining a nanoparticle surface modification technology and a molecular imprinting polymerization technology. The emodin molecular imprinted titanium dioxide nanoparticle composite membrane prepared by the method has high specific recognition ability and adsorption and separation ability to emodin, and the preparation method is safe, non-toxic, low in energy consumption and easy in operation. The composite membrane can be applied to the selective adsorption and separation of emodin in emodin analogs.

The invention relates to a camellia oleifera fruit airing device and method. The device is provided with a support, U-shaped support clips and airing discs. The support is composed of a plurality of transversal beams and support legs. A plurality of U-shaped support clips are arranged, openings of each group of the U-shaped support clips are opposite and symmetrically arranged on support legs at two sides of the support, an inclined angle between the bottom plane of each U-shaped support clip and the horizontal plane is within the range from 0 to 10 degrees, the airing discs are supported in U-shaped grooves of the U-shaped support clips, and can move transversally in the U-shaped grooves. The device is provided with multiply layers of movable airing discs, the sunlight can be prevented from being shaded by moving the support or adjusting the airing disc to make the airing disc stagger according the irradiation angle of the sun during an airing process, so as to achieve the optimal airing effect. The method comprises piling picked fresh camellia oleifera fruits for 48 to 72 hours at the normal atmospheric temperature, to let the camellia oleifera fruits naturally mature and crack, and paving the camellia oleifera fruits on the airing disc to air. Separation between the fruit shells and the tea seeds in the later can be convenient.

The invention discloses a method for preparing beta-phenethyl alcohol. According to the method, acetic acid-3-butene-1-alcohol ester and 1,3-butadiene are adopted as raw materials, and the preparation of beta-phenethyl is finished by adopting Diels-Alder, hydrolysis and dehydrogenation reactions. lewis acid supported by fullerol as a carrier is adopted as the catalyst for the Diels-Alder reaction, the atom utilization rate is high, the total yield can reach 87%-95%, the purity of products can reach 99.92wt%-99.98wt%, and an oxidation reaction process and a high-pressure hydrotreatment reaction process are not adopted, so that the production process is safe and environmentally friendly.

The invention discloses a petroleum separation device based on a density separation method and a separation method of the petroleum separation device, and belongs to the technical field of petroleum exploitation. The petroleum separation device comprises a centrifugal barrel, the top of the centrifugal barrel is sleeved with a petroleum conveying pipe, and the bottom of the centrifugal barrel is sleeved with a rotating disc; a motor is arranged on the bottom surface of the centrifugal barrel, the motor is connected with the rotating disc, and a plurality of blades are arranged on the top surface of the rotating disc; a transmission mechanism is arranged between the top surfaces of the blades and the centrifugal barrel, the transmission mechanism is connected with a flushing mechanism, an oil collecting mechanism is arranged at the bottom of the centrifugal barrel, a bottom plate of the centrifugal barrel is sleeved with one end of a slag discharging pipe, the other end of the slag discharging pipe is sleeved with the top of one side of a water collecting tank, a filter plate is arranged in the water collecting tank, and a water discharging pipe is fixedly sleeved with the bottom of the water collecting tank. Petroleum enters the centrifugal barrel after being extracted, gas discharge and layering speed are accelerated through rotary centrifugation of the rotating disc, then an oil layer flows out through the oil collecting mechanism, a sediment layer and a water layer are discharged through the slag discharging pipe, the discharged water layer repeatedly flushes the centrifugal barrel through the transmission mechanism and the flushing mechanism, and self-cleaning is achieved.

The invention provides high-purity troxerutin and a preparation method thereof, and relates to the technical field of medicinal chemistry and organic synthetic chemistry. The preparation method comprises a front etherification step, a complexation step, a post etherification step and a post-treatment step. The preparation method of the high-purity troxerutin is relatively low in cost, the high-purity troxerutin can be prepared and the method is suitable for industrial production.

The invention discloses a preparation method of felodipine. The method is mainly characterized by adding strong acid cation exchange resin to alcoholic solution of methyl 2-(2,3-dichlorobenzylidine)acetoacetate and ethyl-3-aminocrotonate as a catalyst, which shortens reaction time by more than 1 / 4 and improve yield of cyclization reaction by 6-8%. A crude product felodipine prepared by the preparation method has increased refining yield and product purity. The method is also applicable to preparing other 4-sustituted-1,4-dihydropyridine antihypertensive drugs with chemical structure and pharmaceutical and clinical actions similar to felodipine.

The invention discloses a detaching device comprising a fixture, a first suction plate and a second suction plate. After glue between a face shell and a touch screen is softened and loses efficacy, the first suction plate makes contact with the face shell under the effect of a first driving device, a vacuum pump conducts vacuum pumping operation on a first suction disc of the first suction plate, and suction of the face shell through the first suction plate is achieved. The second suction plate makes contact with the touch screen under the effect of a second driving device, the vacuum pump conducts vacuum pumping operation on a second suction disc of the second suction plate, and suction of the touch screen through the second suction plate is achieved. A second driving device drives the second suction plate to move towards the direction enabling the touch screen and the face shell to be separated, so that the face shell and the touch screen are separated. According to the scheme, separating of the face shell and the touch screen is achieved though the detaching device, accordingly compared with a mode of separating through manual operation in the prior art, manual labor intensity is reduced effectively.

The invention relates to a method for preparing phenol and diphenol by direct hydroxylation of benzene and hydrogen peroxide. Phenol, hydroquinone and pyrocatechol are prepared simultaneously under mild reaction conditions by using xCu-ySiO2 / C as a catalyst and adopting a mixed solvent. The hydrogen peroxide has high effective utilization, the three types of phenols have high overall selectivity,the catalyst has simple preparation method and low cost, so the method has industrial application prospect.

The invention belongs to the technical field of functional material preparation, and discloses a preparation method and application of a palladium-ion-imprinted composite membrane for selectively separating palladium ions. Specifically, a base film is prepared by using polydimethylsiloxane, and the palladium-ion-imprinted composite membrane can be prepared by use of palladium ion as a template, 8-aminoquinoline and 4-vinylpyridine as ligands, hydroxyethyl methacrylate as a functional monomer, ethylene glycol dimethacrylate a crosslinking agent and azobisisobutyronitrile as an initiator by combination of a sacrificial template method and an ion-imprinting polymerization technique. Selective adsorption experiments are used to study the selective adsorption capacity of the prepared palladium-ion-imprinted composite membrane; selective permeation experiments are used to study the selective permeation capacity of the prepared palladium-ion-imprinted composite membrane for a target substance(palladium ion) and a non-target substance (cobalt ion, copper ion, cadmium ion and nickel ion). The results show that the palladium-ion-imprinted composite membrane prepared by the invention has high specific recognition ability and adsorption separation ability for the palladium ions.

The invention provides a thorium extraction and separation method. The thorium extraction and separation method comprises the steps of mixing rare earth waste residues with hydrochloric acid, carryingout solid-liquid separation to obtain hydrochloric acid leachate, and then adjusting the pH value; adding an electrolyte capable of ionizing sulfate radicals into the hydrochloric acid leachate of the rare earth waste residues; mixing primary amine with diluent to obtain an extractant; mixing the leachate with the extractant according to a preset volume ratio for extraction; and carrying out backextraction on the thorium-loaded organic phase obtained through extraction and separation by using a back extractant to obtain a thorium ion-containing solution and a recovered extractant. Accordingto the method, hydrochloric acid is adopted to leach radioactive waste residues of ionic rare earth ores; through comprehensive adjustment to the concentration of N1923, the concentration of sulfate radicals and the acidity of the solution, the extraction rate of the thorium reaches 95% or more, and the rare earth is hardly extracted; the separation order of the thorium and the rare earth is 105 or more; moreover, the thorium in the organic phase is completely back extracted, the extraction capacity of the extractant is not obviously reduced after multiple cycles, and the extractant can be recycled.

The invention discloses a method for directly preparing diethyl carbonate by adopting a one-step method. The method comprises the following steps: mixing absolute ethanol, epoxy propane and a double-component metal oxide catalyst and sealing by a cover; charging CO2 until the pressure is 4MPa to 6MPa, heating to the temperature of 150 to 250 DEG C, and then pressurizing CO2 to the pressure of 7MPa to 12MPa; starting a stirring controller, stirring and reacting for at least 2 hours; decompressing a reaction kettle after cooling the reaction kettle to room temperature to obtain diethyl carbonate and receiving diethyl carbonate by using ethanol. The method disclosed by the invention has the advantages of being simple in process and easy to operate by adopting the one-step method to prepare diethyl carbonate; the used reaction raw materials are low in price and easy to obtain; the catalyst is good in stability and quite convenient to separate subsequently; due to the added epoxy propane, the reaction conversion rate is effectively increased.

The invention relates to a method for synthesizing tris(dioxa-3,6-heptyl)amine. The conventional method for synthesizing the tris(dioxa-3,6-heptyl)amine has low selectivity, low yield and long production period. The method comprises the following steps of: catalyzing diglycol simple methyl ether serving as a raw material by a framework Cu-Ni bimetallic catalyst in the absence of solvent; and introducing hydrogen and ammonia under normal pressure and at the temperature of between 130 and 150 DEG C with stirring so as to synthesize the tris(dioxa-3,6-heptyl)amine, wherein the feeding volume ratio of the hydrogen to the ammonia is controlled to be 1:(5-10); and when the mass ratio of the diglycol simple methyl ether to 3,6-dioxa amine in reaction solution reaches (1.5-2):1, ammonia introducing is stopped and hydrogen introducing speed is not changed until the mass percentage of the diglycol simple methyl ether is less than or equal to 2 percent. The method has the advantages of high selectivity, high yield, convenient subsequent separation and suitability for industrialized production and the production and preparation of the tris(dioxa-3,6-heptyl)amine.

The invention discloses a method for preparing diethyl carbonate by two steps of coupling reaction. The method takes carbamide, ethanol and glycol as raw materials and takes an appropriate metal oxide as a catalyst. The catalyst, the carbamide, the ethanol and the glycol are added into a reaction kettle according to a certain proportion; the carbamide and the glycol have alcoholysis reaction at a temperature of between 160 and 180 DEG C and a pressure of between 2.2 and 3.5MPa to produce an intermediate product of ethylene carbonate, and the ethylene carbonate and the ethanol have ester exchange reaction to produce diethyl carbonate. Compared with the sole carbamide alcoholysis method, the two steps of the coupling reaction effectively reduce gibbs free energy of the reaction. The produced target product of diethyl carbonate has a yield coefficient up to 78 percent. Meanwhile, the process does not produce water, thereby bringing convenience to the subsequent separation and the glycol can be recycled.

The invention discloses a catalyst for catalytic conversion of impurities in octafluorocyclobutane, and a preparation method and an application thereof. The catalyst is composed of an active carbon loaded active component and auxiliary agents, the active component is palladium, the auxiliary agents are X1 and X2, the content of the active component palladium is 0.2-1.5 wt%, the content of the auxiliary agent X1 is 0.1-2.5 wt%, and the content of the auxiliary agent X2 is 0.05-0.8 wt%. The content of alkene-containing fluorocarbon impurities in octafluorocyclobutane can be reduced to 1 ppmv orbelow. The catalyst has the advantages of good performances, high separation efficiency and simplicity in operation.

The invention discloses a method for preparing 5-hydroxymethylfurfural. The method comprises the following steps: mixing materials containing a salt solution, a carbohydrate and a catalyst, and performing reaction I to obtain the 5-hydroxymethylfurfural, wherein the pressure of the reaction I is (-0.1)-(-0.015) Mpa. According to the preparation method disclosed by the invention, the HMF yield of 99% can be obtained, and meanwhile, the pressure of a reaction system is adjusted, so that relatively high reactant conversion rate and reaction product selectivity can be obtained.

The invention belongs to the technical field of functional material preparation, and particularly relates to a preparation method and application of a cloxacillin molecular composite membrane based onclick chemistry imprinting. The preparation method comprises the following step: by taking dopamine as a bionic modified material, cloxacillin as a template molecule, alpha-methacrylic acid as a functional monomer, pentaerythritol tetra(3-mercaptopropionate) as a cross-linking agent and dipentaerythritol penta- / hexa-acrylate as an assistant cross-linking agent, preparing the cloxacillin molecularly imprinted composite membrane based on a ''click chemistry'' polymerization method. The prepared cloxacillin molecularly imprinted composite membrane effectively overcomes the defects that a conventional cloxacillin molecularly imprinted polymer is difficult to recycle, secondary pollution is prone to being generated and the like, and in addition has a good specific recognition capability and anadsorption separation capability on the cloxacillin.

The invention relates to methods for fabricating a semiconductor substrate. In one embodiment, the method includes providing an support that includes a barrier layer thereon for preventing loss by diffusion of elements derived from dissociation of the support at epitaxial growth temperatures; providing a seed layer on the barrier layer, wherein the seed layer facilitates epitaxial growth of a single crystal III-nitride semiconductor layer thereon; epitaxially growing a nitride working layer on the thin seed layer; and removing the support to form the substrate.

The invention belongs to the technical field of functional material preparation, and relates to a method for preparing a bionic MOFs-based double-layer molecular imprinting nano composite membrane based on a double continuous imprinting system. The method comprises the following steps: firstly, synthesizing UiO-66 particles, preparing poly-dopamine-based imprinting UiO-66 by using a dopamine self-polymerization-composite imprinting technology and taking tetracycline as a template molecule, and preparing a UiO-66-based nano-composite imprinting membrane by using the poly-dopamine-based imprinting UiO-66 as a membrane loading material and combining a phase inversion means; finally, taking tetracycline as a template molecule, aminopropyltriethoxysilane and tetraethyl orthosilicate as a functional monomer and a cross-linking agent, and preparing the bionic MOFs-based double-layer molecular imprinting nano composite membrane on the basis of a sol-gel imprinting method. According to the prepared composite membrane, the defects that an existing tetracycline molecular imprinting polymer is difficult to recycle, prone to secondary pollution and the like are overcome, and the application field of membrane separation materials is widened.

The invention relates to a method of preparing n-tetradecane or n-hexadecane from natural acid. According to the invention, the natural acid and a solvent are mixed and then undergo a hydrogenation reaction in the presence of a catalyst and hydrogen, wherein the catalyst is a palladium / carbon nanotube catalyst, reaction pressure of the hydrogenation reaction is 1 to 10 MPa, reaction temperature is 220 to 320 DEG C, reaction time is 3 to 10 h, the catalyst uses a multi-walled carbon nanotube as a carrier and 2 to 10% by mass of palladium as an active component, and the solvent is one selected from the group consisting of hexane, n-heptane, n-octane and dodecane. Compared with the prior art, the method provided by the invention has the advantages of simple preparation technology, a low reaction temperature, a small usage amount of the solvent, high reaction activity and high yield of a target product.

The invention relates to a method for preparing cyclohexanone by phenol hydrogenation. The method comprises the step as follows: raw material phenol makes contact with a catalyst to prepare cyclohexanone under a hydrogen reaction condition, wherein the catalyst contains 95wt%-99.9wt% of a carrier and 0.1wt%-5wt% of Pd in terms of total weight of the carrier and Pd; and the carrier contains aluminum oxide in at least two crystal forms, wherein the content of gamma-Al2O3 is 60wt%-99wt% in terms of total weight of the carrier and Pd. The method can be applied to industrial production of preparation of cyclohexanone by phenol hydrogenation.

The invention provides a process for treating heavy metal wastewater, which can realize heavy metal wastewater treatment in a relatively short time by preparing a magnetic treatment preparation. By adopting the process, after solid and liquid are separated, effluent can achieve the national drainage standard and can be directly drained, sludge is electrolyzed to realize heavy metal reclamation, the used treatment preparation can be separated by utilizing a magnetic separation method, and the treatment preparation can be recycled after regeneration (the heavy metal wastewater treatment effect is not remarkably reduced when the treatment preparation is used repeatedly for more than 1000 times). The process is applicable to heavy metal wastewater treatment, has short time consumption, enableseffluent to accord with the national drainage standard, can realize heavy metal reclamation, and accords with the concept of environmental friendliness.

The invention belongs to the technical field of functional material preparation, and more specifically relates to a preparation method and applications of click chemistry based lincomycin molecularlyimprinted composite membrane. The preparation method comprises following steps: dopamine and polyethyleneimine are taken as hydrophilic modification materials, Lincomycin is taken as template molecule, 4-vinylpyridine is taken as a functional monomer, Pentaerythritol Tetra(3-mercaptopropionate) is taken as a crosslinking agent, Dipentaerythritol penta- / hexa-acrylate is taken as an auxiliary crosslinking agent, based on click chemistry polymerization method, the lincomycin molecule composite film is prepared. The prepared click chemistry based lincomycin molecularly imprinted composite membraneis capable of solving problems in the prior art that recycling of conventional lincomycin molecule imprinting polymer is difficult, and secondary pollution is easily caused; and in addition, the click chemistry based lincomycin molecularly imprinted composite membrane possesses excellent specific recognition capacity and adsorption separation capacity on Lincomycin.

The invention provides a catalyst for preparing methylal and methyl formate through one-step selective oxidation of methanol. The catalyst comprises the following raw material components in percentage by mass based on total mass of the raw material components of the catalyst: 10-20% of a vanadium source, 55-65% of a titanium source and 15-35% of sulfuric acid. The invention provides a catalyst for preparing methyl formate and methylal through one-step selective oxidation of methanol and a preparation method of the catalyst. The catalyst has a high methanol conversion rate, high product selectivity, long life and low-temperature fluctuation sensitivity, the product composition is easily controlled in industrial reaction, and subsequent separation is convenient.