624 results about "Chemical separation" patented technology

A security paper indicates exposure to a solvent by a solvent resistant color signal. A metal mordant dye first co-reactant and a mordant dye second co-reactant form an organic solvent-insoluble colored reaction product when the paper is washed with an organic solvent. The metal mordant dye first co-reactant and a mordant dye second co-reactant are chemically isolated from each other so as to prevent the coordinate covalent bond from forming until the paper is washed with an organic solvent. The chemical isolation can be effected by encapsulation or other physical separation of the co-reactants. The organic solvent-insoluble colored reaction product, once formed, remains entrapped in the web when the paper is washed with an organic solvent. The chemical isolation prevents the organic solvent-insoluble colored reaction product from forming upon the application of pressure alone to the paper.

The invention relates to an underwater super-oleophobic oil-water separation mesh membrane as well as a preparation method and application thereof. A 100-140-mesh fabric mesh is used as the substrate of the oil-water separation mesh membrane; and a hydrogel cladding layer is formed by the crosslinking polymerization of polymer monomers on the mesh wires of the fabric mesh by a photo-initiated polymerization method, thus obtaining the mesh membrane provided by the invention. The oil-water separation mesh membrane is super-hydrophilic in air and underwater and super-oleophobic underwater; the contact angle with oil drops underwater is greater than 150 degrees; and the adhesion to oil drops is low. The mesh membrane provided by the invention can be applied to oil-containing sewage treatment, chemical separation, environmental protection and the like. For oil-water separation, the mesh membrane has the advantages of good separation effect, fast separation, low cost, low energy consumption, convenience, no other chemical additive and the like, and is easy to recover for multiple recycling, and suitable for wide-range preparation.

Methods and devices are provided for overcoming detrimental diffusive effects in a sample liquid stream by forming segmented liquid bodies (e.g., droplets) from a sample liquid stream in an immiscible liquid stream. The liquid bodies are formed at the intersection of a channel providing the sample liquid stream and a channel providing the immiscible liquid stream. The formed liquid bodies compartmentalize the portion of the sample liquid stream from which the liquid bodies are formed, thus minimizing the detrimental effects of diffusion that occur in a continuous liquid stream.

The nature of this invention encompasses the creation of a capillary gas chromatography (GC) column assembly and a thermal modulator used to heat or cool the column assembly in a very thermally and chromatographically efficient manner. The GC column assembly described herein consists of capillary GC column material, such as fused silica or metal capillary tubing, which is constrained to lie in a flat, ordered, spiral pattern and then encased between two thin opposing surfaces. The resulting column assembly is flat, dimensionally stable and can be very efficiently thermally modulated. The resulting column assembly also takes up very little space, has very little thermal mass, and can be easily and accurately manufactured. The column assembly can be adapted for chromatographic use by affixing it to the surface of a thermal modulator described herein by means of adhesive force or by mechanical compression, and then by attaching the free ends of the exposed column material to the input and output ports of the chromatographic device. The temperature of the thermal modulator and capillary column assembly is to be controlled by the chromatographic device or by standalone temperature controlling electronics. The thermal modulator described herein contains an element for temperature modulation of the capillary column assembly to which it is attached and a temperature sensing element for providing accurate temperature feedback to the controlling electronics. The overall result of this when coupled to a chromatographic device is maximally efficient chemical separations in a small space with minimal power consumption.

The present invention is a filtering and chemical separation device that performs the operations of solvent extraction and pervaporation in a single piece of equipment, configured as a spiral-wound membrane module, and provides for the replenishment of the solvent in the supported liquid membrane while the module continues in operation. It provides a solution to the problem of separating miscible compounds efficiently and with low energy requirements.

Monolithic cartridges including a plurality of nominally aligned polymer fibers can be used as stationary phase materials for liquid chromatography separations. Bundles of fibers are packed together so as to form capillary channels between the fibers. Different polymer compositions permit the “chemical tuning” of the separation process. The fibers can be physically or chemically bonded at spaced locations throughout the cartridge or can be packed together under pressure by use of an encasing wrap to form the capillary channels. Use of fibers allows a wide range of liquid flow rates with very low backpressures. Applications in HPLC, cap-LC, prep-scale separations, analytical separations, waste remediation/immobilization, extraction of selected organic molecules/ions from solution, purification of liquid streams (process waste, drinking water, pure solvents), selective extraction of cell matter and bacteria from growth media, and immobilization of cell matter and bacteria are envisioned.

The invention provides a non-cyclic, meso-frequency traveling wave electro-kinetic system capable of use in purification/separation and/or refrigeration/heat pump processes. In particular, the invention provides an adsorption system that can be used for fine or bulk chemical separations of liquid and gaseous materials. Similarly, the adsorption system can be readily adapted to function as a refrigeration/heat pump unit for use in heating and cooling systems. This reusable adsorption system provides high efficiency purification and/or cooling/heating with low energy demands and no moving parts. The invention can function in parallel or in series with other similar such adsorption units (though it can also operate as a single unit).

The invention relates to a multiple response type filtration-controllable electrospun nanofiber membrane and a preparation method thereof. Nanofibers are composed of electrostatic spinning thermosensitive and pH responsive polymers and solvents, and the multiple response type filtration-controllable electrospun nanofiber membrane is formed by putting a prepared mixed solution in an injector and then spinning of an electrostatic spinning apparatus. The multiple response type filtration-controllable electrospun nanofiber membrane and the preparation method thereof have the advantages that since smart response of the thermosensitive and pH responsive polymers in the spinning solution is combined with the advantages of large specific area, high porosity and loose and porous performance of the nanofibers, controllable filtration of air is achieved; the preparation method is simple and easy to implement, low in production cost, high in interception efficiency, low in resistance, rapid in filtration reaction, high in treatment efficiency, reusable and capable of achieving smart separability of the nanofiber membrane and can be applied to the fields such as filtration and adsorption, drug delivery, chemical separation, sensing drive and tissue engineering.

The invention provides a method for preparing carbon nano pipe arrays on the inner surface of a particle, belonging to the technical field of novel material and novel material preparation. In the method, the active metal components are loaded on the inner surface of the particle, and subjected to reduction or thermal decomposition to obtain a loaded type particle inner surface containing metal nano particles; the loaded type particle inner surface is subjected to chemical vapor deposition, and carbon nano pipe arrays grow up between the particle inner surfaces. By the physical or chemical separation, the carbon nano pipe arrays are separated from the particles, and the carbon nano pipe arrays with high purity are obtained, wherein in the method, the reaction speed and the operational conditions are controlled, the bed density of a reactor is kept between 10 and 1000kg/m<3>, and the carbon nano pipes/particles are in flowing/ fluidized states. The method has the advantages of being easily operated, realizing the mass production of the carbon nano pipe arrays and promoting the industrialized application of the carbon nano pipe arrays.

The invention discloses a preparation method of fluorescent complex microgel which is sensitive to temperature and pH. The method comprises the technical steps of preparing a mixed surface active agent, preparing the oil phase of a template, preparing an emulsive liquid, preparing a water phase, preparing N-isopropyl acryl amide copolymerized methacrylic acid microgel, preparing turgid N-isopropyl acryl amide copolymerized methacrylic acid microgel, preparing a mixed liquid of Gamma-aminopropyl triethoxy silane and normal heptane, preparing a silicon dioxide polymer complex microballoon decorated by a surface deposited amino group, preparing a mixed liquid of fluorescein isothiocyanate and absolute ethyl alcohol as well as preparing the fluorescent complex microgel. In the invention, the fluorescein isothiocyanate with high quantum yield and good optical stability is adopted as fluorescent matter; the prepared fluorescent complex microgel is sensitive to temperature and pH; and the size of the prepared fluorescent complex microgel is in a micron range and is hard to be aggregated. The method has the advantages of reasonable design, practical technique and easy operation; moreover, reactions are carried out under normal temperature and the like; the method can be applied to the fields of controlled release of medicament, biological probe, chemical separation, and the like.

The invention discloses a method for preparing regenerated neodymium iron boron magnetic powder by using neodymium iron boron oily sludge, and belongs to the technical field of recovering and recycling of the neodymium iron boron oily sludge. The method comprises the following technological processes: distilling and separating neodymium iron boron oily sludge; coprecipitating and recovering all valuable elements; mixing oxides; adding the substances such as calcium metal and the like according to the ratio; mixing reactants; carrying out thermal reduction and diffusion at high temperature; removing a calcium oxide in the product; drying in vacuum; forming the regenerated neodymium iron boron magnetic powder, wherein the step of 'coprecipitating and recovering all valuable elements' can be accepted or rejected according to existence of metal elements harmful to the magnetic property in the neodymium iron boron oily sludge; a part of impurities are removed from the neodymium iron boron oily sludge by distillation and separation; the mixed oxides are obtained by coprecipitation of the valuable elements; calcium metal particles are added, and subjected to reduction diffusion reaction at 850-1150 DEG C; the regenerated neodymium iron boron magnetic powder can be directly obtained from the product after chemical separation and drying. The method has the advantages that environmental protection is facilitated, the technological process is shortened, the recovery cost is reduced, and a part of technical problems are solved.

A highly functionalized sorbent and sequential process for making are disclosed. The sorbent includes organic short-length amino silanes and organic oligomeric polyfunctional amino silanes that are dispersed within pores of a porous support that form a 3-dimensional structure containing highly functionalized active binding sites for sorption of analytes.

A cold method of heated distillation by manipulating bubbles, and cold distillate condensation is described. The continuous method introduces counter-current gas bubbles to a solution under vacuum at cold temperatures, using passive bubble manipulation. This approach accomplishes volatile evaporation at temperatures too low for thermal damage to occur, scrubs distilland mist from evaporated distillate, and condenses distillate by adding little or no heat. The method operates between freezing and ambient temperatures, but primarily near freezing, thus reducing energy consumption, and completely avoiding common thermal damage to delicate aroma, flavor, color, and nutritional distillate constituents that are characteristic of conventional aroma or essence extraction, food or drink concentrations, and chemical separation processes.

This invention relates to a method for producing components with internal architectures, and more particularly, this invention relates to a method for producing structures with microchannels via the use of diffusion bonding of stacked laminates. Specifically, the method involves weakly bonding a stack of laminates forming internal voids and channels with a first generally low uniaxial pressure and first temperature such that bonding at least between the asperites of opposing laminates occurs and pores are isolated in interfacial contact areas, followed by a second generally higher isostatic pressure and second temperature for final bonding. The method thereby allows fabrication of micro-channel devices such as heat exchangers, recuperators, heat-pumps, chemical separators, chemical reactors, fuel processing units, and combustors without limitation on the fin aspect ratio.

The present invention relates to chemical separation technology, and is especially the pressure swing adsorption process of extracting high purity n-hexane product. The multiple-tower heated pressure swing adsorption process includes the following steps: adsorbing, homogenizing pressure fall and discharging pressure, desorbing, and homogenizing pressure rise and raising pressure. The advanced technological process has simple apparatus, convenient operation, low power consumption, high automation, high marketability and other features.

Polymer fibers having a novel cross-sectional geometry are used as stationary phase materials for liquid chromatography separations. Fibers of 20 to 50 micrometer diameters have surface-channel structures extending their entire lengths. Bundles of fibers having this novel cross-sectional geometry are packed in columns. Different polymer compositions permit the “chemical tuning” of the separation process. Channeled fibers composed of polystyrene and polypropylene have been used to separate mixtures of polyaromatic hydrocarbons (PAHs), Pb-containing compounds and fatty acids. Use of channeled fibers allows a wide range of liquid flow rates with very low backing pressures. Applications in HPLC, cap-LC, prep-scale separations, analytical separations, single fiber separations, waste remediation/immobilization, extraction of selected organic molecules/ions from solution, purification of liquid streams (process waste, drinking water, pure solvents), selective extraction of cell matter and bacteria from growth media, and immobilization of cell matter and bacteria are envisioned.

The invention provides a preparation method of a molecular imprinted polymer membrane by means of grafting rejection. The preparation method comprises the following steps of: preparing a solution of a complex of a functional monomer, a cross-linking agent and a template in a proper proportion, filtering the complex solution by selecting a proper support membrane to reject the complex formed from the functional monomer and the template on the surface of the membrane, selectively filtering out and washing off the functional monomer which does not react with the template to form the stable complex by use of a solvent, grafting a layer of molecular imprinted polymer on the surface of the membrane by means of radiation initiation, and removing the template and an unreacted substance by means of backwashing to obtain the surface grafted molecular imprinted polymer membrane. The molecular imprinted polymer membrane not only keeps the quite large flux and mechanical performance of a carrier membrane, but also is conductive to the elution and recombination of the template, and therefore has excellent application prospect in the fields of chemical separation, solid phase extraction, membrane sensors and the like; the obtained MIP (Molecular Imprinted Polymer) membrane is quite high in imprinting efficiency.

A micropyrolyzer has applications to pyrolysis, heated chemistry, and thermal desorption from liquid or solid samples. The micropyrolyzer can be fabricated from semiconductor materials and metals using standard integrated circuit technologies. The micropyrolyzer enables very small volume samples of less than 3 microliters and high sample heating rates of greater than 20° C. per millisecond. A portable analyzer for the field analysis of liquid and solid samples can be realized when the micropyrolyzer is combined with a chemical preconcentrator, chemical separator, and chemical detector. Such a portable analyzer can be used in a variety of government and industrial applications, such as non-proliferation monitoring, chemical and biological warfare detection, industrial process control, water and air quality monitoring, and industrial hygiene.

This invention relates generally to the field of cell separation or isolation. In particular, the invention provides a method for separating cells, which method comprises: a) selectively staining cells to be separated with a dye so that there is a sufficient difference in a separable property of differentially stained cells; and b) separating said differentially stained cells via said separable property. Preferably, the separable property is dielectrophoretic property of the differentially stained cells and the differentially stained cells are separated or isolated via dielectrophoresis. Methods for separating various types of cells in blood samples are also provided. Centrifuge tubes useful in density gradient centrifugation and dielectrophoresis isolation devices useful for separating or isolating various types of cells are further provided.

The invention belongs to the field of chemical separation and environment protection, and specifically relates to a method for circulating, desorbing, shunting, recovering, and reclaiming hot gas by using an adsorption bed. According to the present invention, a combined technology is adopted, that hot gas is circulated and desorbed by an adsorption bed, part of the desorbed gas is processed through bypass heat exchange, and the desorbed gas is condensed and recovered. With the method and the apparatus provided by the present invention, hot gas reclaiming procedures are carried out economically and effectively with the absorption bed. In prior arts, the energy consumption during hot gas desorbing is high, and the cost of hot exchange equipment is high. With the techniques of the present invention, the limitations are solved, and an advantage of hot gas desorbing technology is maintained, that organic matters recovered with a hot gas desorbing technology have relatively pure quality. The method and the apparatus provided by the present invention can be applied in the occasions of chemical adsorption separation, polluted gas purification, and organic solvents recovery. The method and the apparatus are especially suitable for the recovery of continuously discharged organic tail gas with a large total discharge amount. The recovery rate is higher than 90%.

The invention relates to a method of selection, by two-dimensional separation, of nucleic acids that bind to a target molecule with high affinity from a mixture of nucleic acids, comprising the following steps: a) subjecting the mixture of nucleic acids to a physico-chemical separation step, thereby obtaining a set of mixed fractions containing the nucleic acids, a run parameter window being associated with every mixed fraction containing the nucleic acids, b) contacting a mixed fraction containing the nucleic acids with the target molecule, thereby obtaining a binding mixture containing nucleic acid/target molecule complexes, c) subjecting the binding mixture from step b) to the same physico-chemical separation step as in step a), thereby selecting nucleic acid/target molecule complexes whose run parameters are outside of the run parameter window.

The invention discloses a hydrogen sulfide liquid-phase oxidation removing method taking a deep-eutectic solvent as a medium, and belongs to the field of chemical separation. Various functionalized deep-eutectic solvents are obtained by mixing one or more of mixture of an amide derivative and a diol derivative serving as a hydrogen bond donor as well as imidazolium salt, quaternary ammonium salt or choline serving as a hydrogen bond receptor according to a certain molar ratio; and the deep-eutectic solvents have the characteristics of stable physical and chemical properties, low price, easiness in preparation, excellent solubility on H2S gas and easiness in recovery. The deep-eutectic solvent designed by the invention can face at the H2S gas in various types of sulfur-containing gas source, efficiently realizes selective trapping of H2S gas and transforms the enriched H2S into high-purity sulfur rapidly by a normal-temperature liquid phase oxidation method; the deep-eutectic solvent can be regenerated and reused after being dried; and the whole process has the advantages of high desulfurization efficiency, mild operation condition, low energy consumption, no discharge of VOCs and the like, and is a novel, green and efficient H2S oxidation removing method.