878results about How to "Easy to separate and recycle" patented technology

Sets of communications resources, e.g., sets of peer discovery resources, in a peer to peer communications system may be use concurrently by multiple transmitting devices. The communications system supports a plurality of different pilot sequences. Multiple transmitting devices may transmit their signals on the same set of communications resources, but with different pilot sequences. This approach allows receiving devices to distinguish between multiple signal sources, e.g., wireless terminals, using a shared communications resource. A wireless communications device monitors a plurality of different sets of communications resources and selects, e.g., based on received energy levels, a set of communications resources from said plurality of different sets of communications resources to use for communication. The communications device further selects one of a plurality of different pilot sequences to use for said communication and transmits pilot signals using the selected pilot sequence and at least a portion of the selected set of communications resources.

The present invention provides a preparation of a chitosan compound adsorbent for absorbing magnetic powder heavy metal ion imprint. The chitosan is employed as a imprinting matrix material, the nanometer magnetic powder Fe3O4 is employed as a magnetic component, the epichlorohydrin is employed as a crosslinking agent, the sodium tripolyphosphate is employed as a curing agent, after steps of ion imprinting, magnetic powder embedding and curing and template ion eliminating, the magnetic metal ion imprinting chitosan compound adsorbent is obtained. The compound absorbent prepared by the present invention can be separated from the solution after absorption efficiently and rapidly under the external magnetic field to realize the rapid efficient reclaim of the adsorbent. The compound absorbent has high mechanical strength and selective absorbability of imprint Cr(VI) or Zn (II), avoids the swelling loss of the chitosan in acidity solution and improves the absorption capacity of Cr(VI) or Zn (II). The preparation of the present invention has simple reaction conditions and has no rigorous limit of the experiment conditions. The preparation of the present invention can be used to process the heavy metal waste water containing Cr(VI) or Zn (II), also reclaim Cr(VI) or Zn (II).

The invention discloses a method for synthesizing polyol fatty acid ester. The method comprises: fatty acid and polyol are used as reactants; functionalized ionic liquid is used as catalyst; under operational conditions of normal pressure, a reaction temperature of between 80 and 200 DEG C and reaction time of between 0.5 and 8 hours, the polyol fatty acid ester is synthesized. The method has the advantages of simple working procedure, mild reaction condition, high esterification rate, good stability of the catalyst and recyclability.

The invention relates to a method for flotation of rare earth from Baiyunebo tailings and belongs to the field of ore dressing. The method is characterized by adopting the following steps: firstly, performing ore grinding on the Baiyunebo tailings till the tailings in the particle size of -200 meshes account for above 95%; then performing pulp mixing and flotation on the tailings subjected to the ore grinding, wherein the flotation comprises rougher flotation, concentration and scavenging, and the series of the flotation is determined according to the grade of the rare earth in the tailings and the final requirements on the grade of rare earth concentrate; and sequentially returning middlings generated by the flotation to the upper stage of the flotation. The adopted reagent system is as follows: water glass is taken as an inhibitor, a hydroxamic acid type collector is taken as the collector, and No.2 oil or No. 318 oil is taken as a foaming agent. The method is simple, the production cost is low, the pollution is avoided, the recovery rate of the rare earth is high, the finally obtained tailings can also be used as the raw material for separating other minerals and the comprehensive utilization of resources is realized.

The invention discloses a preparation method of a magnetic antiphase demulsifier. The preparation method is characterized by firstly, preparing monodisperse ferroferric oxide magnetic microspheres by a hydrothermal method; secondly, coating a layer of thin silicon dioxide on the surfaces of the monodisperse ferroferric oxide magnetic microspheres, synthesizing magnetic microspheres with nuclear shell structures, performing group functional modification on the nuclear shell magnetic microspheres by using a silane coupling agent KH560; at last, performing grafting reaction by using the activity of functional groups and an antiphase demulsifier to obtain the magnetic antiphase demulsifier; the magnetic antiphase demulsifier prepared by the preparation method can improve the efficiency of original antiphase demulsifiers and has the characteristics of easy separation, high oil removing rate, obvious separation effect to oil-containing sewage, little use amount and high efficiency.

The invention belongs to the technical field of solid waste treatment and resource recovery, and relates to an apparatus for pyrolyzing solid wastes through molten salt, and a method thereof. The method uses the molten salt as a pyrolysis medium, the solid wastes are immersed in the molten salt and are effectively dissociated and decomposed under preset pyrolysis conditions, and various resource substances can be recovered. Pyrolysis products of organic components in the solid wastes are recycled as energy and resource substances. The method has the advantages of short process flow and simple operation. The apparatus allows the above raw material to be sent into or moved out of a molten salt reactor through a pyrolysis basket, and comprises a gas inlet, a gas outlet, and a feeding and discharging gate. The method uses the high heat accumulation capability and high heat conduction rate of the molten salt, effectively improves the decomposition rate of organic matters and the energy utilization rate, traps or converts acidic gases and harmful substances by using the characteristic of reaction of the molten salt with the acidic gases and the harmful substances, reduces secondary pollution to environment, and improves the cleanliness and resource of products.

The invention provides a method of applying a low metal loading catalyst for preparing glycol and propylene glycol from carbohydrate, including cellulose, starch, semi-cellulose, cane sugar, glucose, fructose, fructosan, xylose, and soluble xylo oligosaccharide. In the method, carbohydrate is taken as the raw material, the compound catalyst is composed of catalytic active components selected from one or more components from following components: highly-disperse and low-loading ruthenium, inorganic compounds, organic compounds, and complex of tungsten, or simple substance tungsten, then one-step catalytic conversion process is carried out under the hydrothermal conditions: temperature of 60 to 350 DEG C, and hydrogen pressure 0.1 to 15 MPa, and the high-efficient, high-selective and high yield preparation of glycol and propylene glycol from carbohydrate is achieved. The method takes highly-disperse and high stability low loading Ru-based catalyst as the reaction catalyst, so the usage amount of value metals is reduced, the loss of catalyst carrier is slowed down, and the recycle rate of Ru-base catalyst is increased. The catalyst has the prominent advantages of high activity, high selectivity, and very high cyclicity. Compared to other technologies, which prepare polyol from carbohydrate, the method has the advantages of simple reaction process, high efficiency, good stability of catalyst, and multi-circulation, and has very vast industrial application value.

The invention provides an acidified mixed crystal TiO2 nanowire loaded photocatalyst. The photocatalyst is prepared by using the following method: dispersing titanium dioxide P25 in a NaOH aqueous solution, carrying out hydrothermal reaction on the obtained mixture, and after the reaction is completed, filtering out precipitates; putting the precipitates into a hydrochloric acid solution, carrying out impregnation acidification, washing the precipitates by using deionized water, drying the precipitates in a vacuum drying oven, and putting the precipitates into a muffle furnace and calcining for 2-8h at the temperature of 500-600 DEG C so as to obtain a mixed crystal TiO2 nanowire; adding the mixed crystal TiO2 nanowire and transition metal salt into an ethanol aqueous solution, dropwise adding a sulfuric acid aqueous solution, soaking and stirring, carrying out a hydrothermal reaction, and after the reaction is completed, removing liquid supernatant; and carrying out vacuum drying on the obtained object so as to obtain the photocatalyst. The photocatalyst can be applied to the visible light catalytic oxidation reaction of industrial organic wastewater, and is high in catalytic activity, good in stability, economical and efficient.

The invention provides a preparation method of a magnetic imprinting composite photocatalyst with good light transmission, belonging to the technical field of preparation of environmental materials. The method comprises using magnetic Fe3O4 nanoparticles as carriers, coating SiO2 insulating layers on surfaces of the nanoparticles, using a sol-gel technology to prepare a TiO2@SiO2@Fe3O4 photocatalyst, using polyethylene glycol to treat surface of the photocatalyst, and using modified TiO2@SiO2@Fe3O4 as a base material, enrofloxacin hydrochloride as a template molecule, methyl methacrylate as an imprinting functional monomer, styrene as a polymerization monomer, trimethylol propane trimethacrylate as a cross-linking agent, azodiisobutyronitrile as an initiator and a mixed solution of dimethyl sulphoxide and water as solvents to prepare the magnetic imprinting composite photocatalyst with the good light transmission. The invention is advantageous in that a magnetic separation characteristic of the photocatalyst enables separation and recovery of samples to be relatively convenient and high-efficiency.

The invention provides TiO2/RGO aerogel, and a preparation method and application of the TiO2/RGO aerogel, belonging to the technical fields of material preparation and environment purification. By adopting L-Cysteine as a reducing agent and a crosslinking agent, the TiO2/RGO aerogel is prepared by loading TiO2 onto ROG aerogel by a simple one-step hydrothermal method for the first time, and the TiO2/RGO aerogel has a macrostructure of which the diameter is 2.0cm and the height is 3.5mm. The prepared aerogel has high specific surface area, can efficiently adsorb oily wastewater and treat the oily wastewater in a photocatalysis manner, and is easy to separate and recycle. The preparation method is simple, is beneficial to large-scale industrial production, and has significant economic benefits and social benefits, and raw materials are cheap and easily available.

The invention discloses a method for synthesizing 2,5-dihydroxymethylfuran by selective hydrogenation of 5-hydroxymethylfurfural. The method is characterized in that a magnetic metal-organic coordination polymer is used as an acid and base bifunctional catalyst, low-price and easily-obtained low carbon alcohol is used as an in-situ hydrogen donor, and the 5-hydroxymethylfurfural is efficiently transformed into the 2,5-dihydroxymethylfuran by a selective transfer hydrogenation reaction under mild operation conditions and the maximum yield of the 2,5-dihydroxymethylfuran can be up to 98.6 percent. The magnetic metal organic coordination polymer used in the method disclosed by the invention has the advantages of relatively-high acid-base strength, more acid-base sites, relatively-large specific surface area and suitable pore size; in addition, the magnetic metal organic coordination polymer is simple in preparation process, is easy to separate and recover and shows excellent catalytic activity and catalytic stability. Furthermore, the low carbon alcohol is used as the in-situ hydrogen donor in the invention, so that the use of molecular hydrogen is avoided and the safety of the reaction process is improved; besides, the low carbon alcohol can be used as a reaction solvent and the introduction of exogenous substances is reduced, and thereby the production cost can be further reduced.

The invention belongs to the technical field of zeolite materials, in particular to a method for synthesizing ZSM-5 zeolite orderly accumulated by nanometer crystallite. The method comprises the following steps: adding MFI type zeolite seed crystal in a common ZSM-5 zeolite synthesizing solution; and synthesizing the ZSM-5 zeolite with multistage pore canals and controllable granular size by modulating the synthesizing ration, reaction condition or adding additives. In the invention, the ZSM-5 zeolite is an assembly body of a class of single crystals, which is grown by orderly packing seed crystals by ZSM-5 zeolite crystallite, has small granular and a multistage pore canal structure, larger surface area, shorter mass transfer route, good stability, and can be used for reactions for diffusion control or the surface activity site control. The method has short hydro-thermal treatment time, high crystallinity and yield and the like, and is convenient to separate the ZSM-5 zeolite.

This invention involves magnetic solid base catalyst, its components including magnetic material and metal oxide or magnetic vector with a mixture of metal salt as a catalyst, activity group is alkali metal salts. Their preparation methods: magnetic material and metal oxide or metal salts fully mixed grinding and dispersed evenly to join the binder, and then roasted and insulation, get a magnetic catalyst carrier; put active component into deionized water prepared impregnating solution; Magnetic catalyst carrier parked in the above impregnated solution to response, static aging, drying, calcination and insulation, then get a magnetic solid base catalyst. The invention magnetic solid base catalyst production process is simple, low cost, used for the preparation of the bio-diesel in transesterification reaction, catalytic function is superior, separation and recovery is convenient after transesterification reaction.

The invention discloses a compound heavy metal adsorbent. The compound soil heavy metal adsorbent comprises a floating core and a compound high molecule coating the floating core, wherein the mass ratio of the floating core to the compound high molecule is (1-5):1; the compound high molecule comprises a first polymer and a second polymer of which the mass ratio is (5:1)-(1:5); the first polymer is alginic acid or calcium alginate; the second polymer is modified chitosan; a modification group of the modified chitosan is small molecule chelator; the small molecule chelator has a carboxyl group and at least two chelation groups; the amino group ratio of the small molecule chelator substituted chitosan is above 30%; and the remaining amino groups in the chitosan and hydroxyl groups of the first polymer are crosslinked through dialdehyde molecules. According to the invention, the soil heavy metal adsorbent is prepared by compounding the modified chitosan modified with the small molecule chelator with the alginic acid/calcium alginate and the floating core, thereby improving the adsorbability of the soil heavy metal adsorbent.

The invention relates to treatment of oil-field oily sludge and particularly relates to a treatment method of recycling oil-field oily sludge. A treatment device comprises a waste oil sludge lifting device, a vibrating sieve, an extracting tank, a three-phase separating tank, a distillation tower, and an electrical floating and filtering device; a treatment method comprises steps of mechanical sieving, solvent extracting, three-phase separating, solvent recycling and oil residue treating. According to the method, the extracting method is the water-assisted solvent extracting process, so that the extraction is relatively sufficient and the later-stage phase separating and recycling are relatively facilitated; a solvent can be recycled, and assisted water can be recycled after electrical floating and filtering treatment, so that secondary pollution is not caused, mud residue can be effectively utilized after biological treatment, and therefore, a waste oily sludge resource is sufficiently utilized, petrol resources are saved, environmental pollution is eliminated, and economic and social benefits are generated.

The invention relates to a kind of Mg-Al hydrotalcite loaded bimetallic nano-catalyst and its preparation method, and relates to application of the catalyst system in oxidation of alcohol into corresponding carbonyl compounds. The catalyst preparation method consists of: 1) preparing an Mg-Al hydrotalcite carrier through a urea decomposition method; 2) loading the precursors of metal Pd and Au on the Mg-Al hydrotalcite surface; and 3) then reducing Pd (II) and Au (III) through NaBH4, thus obtaining the bimetallic nanometer particle catalyst. The catalyst provided in the invention has the advantages of high catalytic activity, good stability, separability, and easy recovery, thus being applicable to alcohol oxidation reactions in aqueous phases.

The invention discloses a preparation method of separating a zinc oxide-based photocatalyst by magnetic control, which comprises the following steps: preparing a magnetic material, then using the preparative magnetic material as a core to prepare the core-shell photocatalyst capable of separating by magnetic control. According to the invention, the photocatalyst enables easy separation and recovery through an external magnetic field, the method for the photocatalyst by magnetic control has the advantages of simple process and small operation difficulty, the prepared photocatalyst has the advantages of high activity, table performance and strong practicality, and possesses strong popularization and application value. Compared with a ZnO photocatalyst prepared by the same method, the catalytic activity of the photocatalyst of the invention is enhanced, the external magnetic field enables easy separation and recovery, and the preparation technology is simple. According to the composite photocatalysis material prepared by the magnetic material and ZnO, compared with simple ZnO, the photocatalysis effect is maintained after 3 times circular usage, and the practical usage cost can be substantially reduced on certain degree.