59results about How to "Reduce desorption" patented technology

The invention relates to a multiple-quantum well waveguide butt-coupling method comprising the following steps of: A, carrying out primary epitaxy on a substrate to obtain a multiple-quantum well structure; B, after a dielectric film is deposited, carrying out mask photoetching, and removing a waveguide part of a first region requiring secondary epitaxy by using a three-step etching method; C, placing an epitaxial wafer into metal organic chemical vapor deposition equipment for high-temperature treatment; and D, carrying out secondary epitaxial growth to obtain a second multiple-quantum well structure. By using the method, an attractive interface etching appearance can be achieved, cavities caused during growth can be avoided, the butting quality can be effectively improved, the coupling loss can be reduced, and good repeatability can be obtained. The multiple-quantum well waveguide butt-coupling method can be used for manufacture and batch production of various photoelectronic integrated chips.

A method for preparing porous fluorapatite ceramic adsorbing radioactive nuclide is characterized by including: using the materials in percent by weight: 50-80% of calcium pyrophosphate, 4-26% of calcium fluoride and 16-45% of calcium carbonate, and mixing, ball-milling, drying, press-forming, calcining, grinding, and screening to obtain fluorapatite powder; mixing the fluorapatite powder with polyethylene glycol solution, methyl cellulose solution and hydrogen peroxide solution, and performing microwave assisted pore-forming, drying and the like to obtain a porous fluorapatite ceramic blank; preparing porous fluorapatite ceramic adsorbing material via normal pressure sintering. The porous fluorapatite ceramic adsorbing material prepared herein has the advantages of high radiation stability, good thermal stability, high mechanical and chemical stability and the like, also has high specific surface energy and nuclide adsorbing capacity and may be used as an efficient adsorbing material for radioactive nuclide in high-radioactive waste liquid, thus effectively protecting human health and ecological environment.

The invention relates to a nitrogen controlling material prepared based on lake sediment, a preparation method and application thereof. The preparation method includes: collecting lake sediment as the raw material, conducting freeze drying, grinding and sieving, then carrying out high temperature roasting for certain time, and performing cooling so as to obtain the nitrogen controlling material. According to the invention, lake sediment is adopted as the raw material, and is subjected to heat treatment to prepare the nitrogen controlling material. The nitrogen controlling material comes from lake sediment, not only has low price, but also has high safety, has no ecological risk to lake water, also the high temperature roasted sediment has the characteristics of strong ammonia nitrogen adsorption capacity and weak desorption, thus solving the problems of high cost of ammonia nitrogen controlled release materials, poor ecological safety and limited ammonia nitrogen controlled release effect in the prior art.

The invention comprises a combination processing method of coal tar. The method comprises the steps of: the coal tar raw material: (a) introducing a coal tar raw material, delayed coking gas oil and at least part of a liquid phase from a step (d) into a distillation tower, so as to distillate out a light distillate, wax oil and bottom oil; and subjecting the light distillate and the wax oil to a hydrotreating reaction; (b) carrying out gas-liquid separation on an effluent from the hydrotreating reaction, and sending a liquid phase into a fractionation device, so as to distillate out a light fraction and a heavy fraction; (c) carrying out a hydrocracking reaction on at least part of the heavy fraction obtained in the step (b); (d) sending an effluent from the hydrocracking reaction into a hot high pressure separator, so as to separate out a gas phase and a liquid phase; and sending at least part of the liquid phase to the distillation tower in the step (a); and (e) subjecting the bottom oil obtained from distillation in the step (a) to delayed coking, and sending the delayed coking oil gas to the distillation tower in the step (a). Compared with the prior art, the invention method improves the yield of light fuel production from coal tar, prolongs the service life of a catalyst, and increases operation cycle of the device.

The invention provides a light emitting diode epitaxial wafer and a manufacturing method thereof. The epitaxial wafer comprises a substrate, a buffer layer, an undoped u-GaN layer, an N-type GaN layer, a stress release layer, a multi-quantum well layer, an electron barrier layer and a P-type GaN layer, the multi-quantum well layer comprises a front insertion layer, a quantum well layer, a rear insertion layer and a quantum barrier layer; the front insertion layer comprises an In < x > N < 1-x > layer and an In < y > Ga < 1-y > N layer, and the contact surface of the In < x > N < 1-x > layer and the In < y > Ga < 1-y > N layer is processed by H2 to form a hole and processed by NH3 to form an N polar surface; the rear insertion layer comprises an Al < z > Ga < 1-z > N layer and a GaN layer, the surface, in contact with the Al < z > Ga < 1-z > N layer, of the quantum well layer is subjected to NH3 treatment to form an N polar surface, and the surface, in contact with the quantum barrier layer, of the GaN layer is subjected to H2 treatment. According to the invention, the problems of low luminous efficiency and low wavelength uniformity of the existing light-emitting diode are solved.

The invention relates to a sorbent for removing endotoxins from a biological liquid, comprising a water-insoluble, porous substrate having a neutral, hydrophobic surface, wherein the surface of the substrate has an adsorbent coating made of polymyxin and albumin, wherein polymyxin and albumin are bonded to the surface of the substrate in a noncovalent manner. The invention further relates to a method for producing such a sorbent. The sorbent is used in extracorporeal blood purification, in particular in order to treat individuals who have sepsis.

The invention discloses a cellular V2O5-Pr6O11-SbPO4/TiO2 based low-temperature sulfur-resistant denitration catalyst and a preparation method thereof. The cellular V2O5-Pr6O11-SbPO4/TiO2 based low-temperature sulfur-resistant denitration catalyst is prepared from the following components: 1-5wt% of V2O5, 2-6wt% of Pr6O11, 1.5-5wt% of SbPO4 and 84-95.5wt% of a TiO2-based carrier, wherein the TiO2-based carrier comprises one or more of titanium dioxide, titanium tungsten powder and titanium tungsten silicon powder. The invention further discloses a preparation method of the cellular catalyst. The prepared catalyst has high denitration efficiency at the smoke (exhaust gas) temperature of 175-300 DEG C, and also has excellent sulfur resistance.

The invention discloses a reduction washing-fade dyeing technology. The technological process starts from a semi-finished product of white cloth and comprises: a dye suspension padding process, a first drying process, a fixing liquid padding process, a first steaming process, a reduction liquid padding process, a second steaming process, a first washing process, a soap boiling process, a second washing process and a second drying process, wherein the dye suspension in the dye suspension padding process is prepared by compounding a vat dye and a reactive dye in a ratio of (3:1) to (4:3). In the invention, the vat dye is compounded with the reactive dye, the two dyes are applied to the cloth surface at the same time, thus the dyeing of the vat dye is uniform, and the dyeing performance of the reactive dye can be improved; and after the fabric dyed by the technology disclosed by the invention is made into a finished product, an old-like style can be obtained through chlorine bleaching.

The invention discloses a two-stage combined hydrogenation process of coal tar. The process comprises the steps of: (a) sending a coal tar raw material into a hydrogenation reaction section for a hydrotreating reaction; (b) carrying out a gas-liquid separation on an effluent from the hydrogenating reaction section, and sending a separated liquid phase into the a fractionation device, so as to distillate out a gasoline fraction, a diesel fraction and a heavy fraction; (c) sending at least part of the heavy fraction from the step (b) into a hydrocracking reaction section for a hydrocracking reaction; (d) sending an effluent from the hydrocracking reaction section into a hot high pressure separator, in order to separate out a gas phase and a liquid phase, and sending at least part of the liquid phase to the hydrotreating reaction section in the step (a); (d) sending an effluent from the hydrocracking reaction section into a hot high pressure separator, in order to separate out a gas phase and a liquid phase, and sending at least part of the liquid phase to the hydrotreating reaction section in the step (a); Compared with the prior art, the method provided by the invention improves the yield of light fuel production from coal tar, prolongs the service life of a catalyst, and increases operation cycle of the device.

The invention relates to mineral separation equipment, and discloses a flotation column device. The flotation column device comprises a different-diameter flotation column and a jet flow mineralization system used for supplying mineral pulp to the different-diameter flotation column; the different-diameter flotation column comprises an upper cylindrical section and a lower cylindrical section withthe diameter being smaller than that of the upper cylindrical section; the upper cylindrical section and the lower cylindrical section are connected through a conical transition section, and the lower cylindrical section is connected with a bottom conical section; a bubble collecting tank is arranged on the outer side of the upper end of the upper cylindrical section and connected with a bubble collecting pipe; and a tailing collecting pipe is arranged on the lower part of the bottom conical section. According to the flotation column device, colliding and adhesion of particles and bubbles areachieved in an appropriate turbulent environment; in a relatively-static fluid environment and under the large column body diameter, deadhesion of the coarse particles is reduced advantageously, meanwhile separation of useful minerals from gangue minerals is improved, and thus the separation efficiency is effectively improved; and the flotation column device has the advantages of being small in floor space, low in energy consumption and good in separation effect.

The invention relates to an anti-blocking combined process and system with high treatment efficiency for low-concentration VOC tail gas. The process comprises the following steps of (1) pretreating the low-concentration VOC tail gas; (2) preheating; (3) conducting RTO incineration; (4) conducting high-temperature reverse burning; (5) preheating the tail gas by incinerated flue gas and conducting primary cooling on the flue gas; (6) conducting secondary cooling on the flue gas subjected to primary cooling and cooled and dewatered flue gas; (7) deacidifying the flue gas subjected to secondary cooling; (8) heating and drying the cooled and dewatered flue gas; and (9) adsorbing the flue gas in a zeolite molecular sieve to remove secondary organic matters. According to the process and the system, the waste heat of low-temperature flue gas is recycled, the charging temperature of the waste gas is increased, and the adsorption of high-waste boiling substances in the charging waste gas on a heat storage bed is reduced, so that the desorption of the high-waste boiling substances during flue gas discharge is reduced, meanwhile, the situation that amine organic matter decomposition product ammonia is adsorbed on the heat storage bed and directly enters a hearth to be decomposed is reduced, ammonia sources for synthesis of ammonium salt are reduced, and blockage caused by gathering of ammonium salt particles in a heat storage bed layer is reduced.

The invention provides an oily sludge treatment method and a soil remediation method.The oily sludge treatment method comprises the steps that after oily sludge and target biochar are evenly mixed according to a first preset mass ratio, catalytic pyrolysis reaction is conducted at the first preset temperature, efficient removal of petroleum hydrocarbon is achieved, and pyrolysis residues are obtained and used for soil remediation.

The invention relates to a preparation method and a product of a calcium oxide desiccant, the preparation method comprises stirring raw materials for mixing to obtain powder, granulating, forming, drying and roasting; the step of stirring the raw materials for mixing to obtain the powder includes: adding calcium carbonate and/or calcium hydroxide, alumina, lignin and glass fiber into a powder mixer for stirring for mixing to obtain the powder, and adding a carboxymethyl cellulose solution prepared from the carboxymethyl cellulose and water into the powder mixer for continuously stirring. By optimizing the composition and proportion of the raw materials, the calcium oxide desiccant form a three-dimensional network structure, has excellent activity, water absorption ability and water fixation ability, and can fully meet the needs of long-term and efficient drying of a camera lens.

The invention discloses a nonpolar macroporous adsorption resin carboxylation modification method for glycyrrhizic acid adsorption. Macroporous adsorption resin modification mainly comprises two steps, namely, chloromethylation reactions are implemented on a nonpolar macroporous resin through an ultrasonic catalysis reaction firstly, and then the reaction activity of the macroporous adsorption resin can be improved; secondly, the resin is reacted with a carboxylic acid functional monomer, and then a carboxylation modification macroporous adsorption resin can be prepared. Through the ultrasoniccatalysis reaction, under the action of a chloromethylation reagent, the macroporous adsorption resin of a high carboxylation degree can be prepared, and adsorption capacity tests on glycyrrhizic acid with the modified macroporous adsorption resin show that the adsorption capacity of the modified carboxylation macroporous adsorption resin upon the glycyrrhizic acid is increased when being compared with that of an unmodified macroporous adsorption resin.

The invention discloses a waste incineration fume treatment method for controlling the dioxin memory effect. The waste incineration fume treatment method comprises the steps that fly ash and other sediments with the dioxin memory effect in a device and a pipeline are removed before an incinerator is started, activated carbon is pre-sprayed into a bag-type dust collector so that a lot of dioxin generated in the incinerator starting and incineration processes can be effectively adsorbed in time, and moreover, the severe dioxin memory effect caused when the bag-type dust collector adsorbs a massive amount of dioxin because of the device itself, aging and the like in the long-time using process can be controlled. By means of the method, it can be achieved that the discharging concentration ofthe dioxin can meet the discharging standards the next day when the furnace is started, and starts tending to be stable the fourth day after the furnace is started, and the environment-friendly standard requirements are met. The method can effectively control the dioxin memory effect, the heat efficiency is high, energy conservation and environment protection are achieved, the method is simple andfeasible, and the operation is convenient.