4984 results about "Hexane" patented technology

The present invention discloses the compound of Formula 3 as an inhibitor of HCV protease, as well as methods for preparing the compound. In another embodiment, the invention discloses pharmaceutical compositions comprising the compound as well as methods of using them to treat disorders associated with the HCV protease.

A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 inn and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.

The invention discloses a super-hydrophobic and super-oleophylic oil-water separating mesh membrane and a preparation method thereof. The method comprises the following steps of: (1), cleaning a fabric mesh and drying the cleaned fabric mesh; (2), dissolving dopamine hydrochloride and trihytdroxy methyl-aminomethane to water to acquire a mixed solution, wherein the pH value of the mixed solution is 8.0-12.0; (3), soaking the dried fabric mesh in the mixed solution, and then getting out the soaked fabric mesh for drying; (4), dissolving mercaptan compound and sodium hydroxide in water to acquire mixed turbid liquid; (5), soaking the fabric mesh acquired in the step (3) in the mixed turbid liquid, reacting the mixture to acquire the oil-water separating mesh membrane. The oil-water separating mesh membrane disclosed by the invention has high bearing pressure to water so that oil can quickly pass, a separating effect is good, the speed is high, and the separating effect on normal hexane, petroleum ether, benzene, gasoline, diesel oil, animal and vegetable oil, crude oil and the like is good. The oil-water separating mesh membrane is non-toxic and harmless, environment-friendly, easy to clean and keep, can be reusable, and has good stability.

An industrial process to obtain xanthophyll concentrates of high purity from plant extracts, comprising: refining the plant extracts by treating them with a diluted alkali, followed by treating them with a diluted organic or inorganic acid in order to eliminate impurities and undesirable components and obtaining a refined extract; saponifying the refined extract by means of a strongly alkali aqueous solution; treating the diluted saponified mass with a dilute organic or inorganic acid to adjust the pH to a value from 4 to 7, in order to separate a xanthophylls concentrate; and removing any remaining impurities by extracting them by means of hexane.

The present invention discloses a preparation method for hydrophobic silica aerogel with industrial waterglass as a raw material, which comprises the following steps: diluting the industrial waterglass with water; neutralizing with an acid to obtain hydrosol; allowing the hydrosol to stand and age for 8-48 hours at normal temperature so as to form hydrogel; replacing the water in the hydrogel with anhydrous ethanol; allowing the hydrogel to react with organosilane compounds; performing surface modification and simultaneous solvent exchange with n-hexane; suction-filtering; washing; allowing to stand at normal temperature to obtain white hydrophobic silica aerogel powder. The preparation method has simple process and low cost, and the prepared aerogel has porous network-like structure which features a low density and a high specific surface area.

A method for providing an anhydrous route for the synthesis of amine capped coinage-metal (copper, silver, and gold) nanoparticles (NPs) using the coinage-metal mesityl (mesityl=C₆H₂(CH₃)₃-2,4,6) derivatives. In this method, a solution of (Cu(C₆H₂(CH₃)₃)₅, (Ag(C₆H₂(CH₃)₃)₄, or (Au(C₆H₂(CH₃)₃)₅ is dissolved in a coordinating solvent, such as a primary, secondary, or tertiary amine; primary, secondary, or tertiary phosphine, or alkyl thiol, to produce a mesityl precursor solution. This solution is subsequently injected into an organic solvent that is heated to a temperature greater than approximately 100° C. After washing with an organic solvent, such as an alcohol (including methanol, ethanol, propanol, and higher molecular-weight alcohols), oxide free coinage NP are prepared that could be extracted with a solvent, such as an aromatic solvent (including, for example, toluene, benzene, and pyridine) or an alkane (including, for example, pentane, hexane, and heptane). Characterization by UV-Vis spectroscopy and transmission electron microscopy showed that the NPs were approximately 9.2±2.3 nm in size for Cu°, (no surface oxide present), approximately 8.5±1.1 nm Ag° spheres, and approximately 8–80 nm for Au°.

The invention relates to a polymer comprising units derived from ethylene, said polymer having: a) a Melt Index of from 0.05 to 20 g/10 min as determined by ASTM-1238 Condition E; b) at least 10 per 1000 C-atoms of short chain branches, containing five carbon atoms or less, as determined by C13 NMR, and less than 3.5 mol %, of units derived from a copolymerizable ethylenically unsaturated ester, c) a density of from 0.90 to 0.94 g/cm³, preferably 0.91 to 0.935 g/cm³, especially 0.92 to 0.93 g/cm³ as determined by ASTM D1505, and d) a relaxation time as described herein of at least 10 s. Such polymers are obtainable by polymerization by free radical polymerization using a chain transfer agent that incorporates into the polymer chain such as an alpha-olefin, preferably propylene, as a chain transfer agent, preferably in a tubular reactor under circumstances to favor LCB formation in a down stream part of the tubular reactor.

The polymer may be used for stretch hood film, preferably as a blown film coextruded tube comprising: a) a core of the above polymer; and b) a skin layer, on each side of the core which may be of the same or different composition, comprising at least 60 wt % of an LLDPE having density of 0.91 to 0.94 g/cm³ as determined by ASTM-D 1238 Condition E and hexane extractables less than 1.5 wt %, said skin layer containing less than 7500 ppm of anti-block particulates and said film having an elastic recovery after a 100% stretch of at least 40% and providing a normalized holding force per 100 μm thickness pre-stretch at 85% stretch after an initial stretch of 100% of at least 20 N/50 mm at a deformation rate of less than 10% of the starting length per second.

A novel process for the selective elimination of fatty acid compounds containing carbon-carbon double bonds in trans configuration from a substrate containing cis- and trans-isomers of said fatty acid compounds, by selective adsorption by a microporous zeolite material is disclosed. The pore size and shape of usable zeolite materials enable differentiation between cis- and trans-isomers of unsaturated fatty acid chains. The zeolite materials used have a selectivity ratio alphatrans/cis higher than 1.00; this ratio is defined based on the elution properties of cis and trans double bond containing fatty acid methylesters dissolved in n-hexane during a column chromatography experiment with the zeolite material as the stationary phase and n-hexane as the mobile phase. Besides selective adsorption of trans-unsaturated fatty acid compounds, simultaneous or subsequent total or partial hydrogenation of the double bonds in said compounds can be carried out while using the same or similar zeolite material, containing finely dispersed catalytic active metals. The majority of these catalytic active sites must be inside the pores.

The present invention discloses a method for preparing low density silica aerogel under normal pressure. The method comprises: mixing tetraethoxysilane, water and ethanol according to a volume ratio of 1:0.5-19:1-29, adding an acid to adjust the pH value to 3-4, carrying out catalysis hydrolysis, adding an alkali to adjust the pH value to 6-6.5, carrying out catalysis gelating for 8-10 min to obtain a wet gel, aging the wet gel for 6-36 h at a room temperature, adding n-hexane to carry out solvent replacement for 6-36 h, immersing in a trimethylchlorosilane and n-hexane mixed solution to carry out hydrophobic modification for 12-15 h, adopting a n-hexane washing solution to remove the modification solution, placing into a muffle furnace to heat to a temperature of 30-250 DEG C, drying, and finally cooling to a room temperature to obtain the silica aerogel. Test results show that the density of the SiO2 aerogel is 50-80 kg/m<3> and is significantly lower than the density of the SiO2 aerogel prepared under the normal pressure dry condition in most of the public reports.

Application of a reference mixture of natural products for systematic analysis and comparison of the properties of biphasic solvent systems in counter-current/partition chromatography. Because the reference mixture is comprised of compounds with varying polarities, functional groups, and structural features it provides a rational method for mapping the optimal resolution polarity range of a particular solvent system. The mapping of optimal resolution polarity ranges of solvent systems provided for the description of the overall optimal resolution polarity range of a solvent system family, comprised of the same solvents in different proportions. By comparing the reference mixture performance in the individual members of a solvent system family, the solvent system that best functions as the representative of, or portal to, the solvent system families is determined. Use of the reference mixture also afforded a method to compare the overall optimal resolution polarity ranges of solvent system families. Based on performance of reference mixture chromatograms, the CCC properties of solvent systems, can be compared and their CCC potential examined. The methods of the invention employing the reference mixture provides was used to identify a quaternary solvent system, hexane/t-butylmethylether/acetonitrile/water (HterAcWat), which was found to be useful for CCC of mixtures containing natural products.

The invention discloses a crosslinking hyper branched polymer composite nanofiltration membrane as well as the preparation method thereof. The crosslinking hyper branched polymer composite nanofiltration membrane is prepared by taking an ultrafiltration membrane as a basement membrane and crosslinking hyper branched polymer as a selecting layer through hyper branched polymer and the interfacial polymerization of polybasic acid, polybasic acyl chloride, polybasic anhydride and polybasic amine; and the interfacial polymerization takes the mixed solution of water and ethanol as the water phase and n-hexane, n-heptane or n-octane as the organic phase. As the hyper branched polymer has the spheroidal structure, a plurality of nano-voids exist in the interior of the molecule, so as to enable the selecting layer of the crosslinking hyper branched polymer composite nanofiltration membrane to be looser, and leads the nanofiltration membrane to maintain high flux and retention rate under the lower operating pressure. The nanofiltration membrane can be used in the fields of medicament, foodstuff, environmental protection, etc. The composite nanofiltration membrane is applicable to the separation and the condensation of high valence ions, low valence ions, neutral particles, drugs, food additives, etc.

The invention discloses a preparation method of an aromatic polyamide film modified by a ZIF-8 type metal-organic framework material. A ZIF-8 filling polyamide composite film is prepared on an ultrafiltration bottom film by an interfacial polymerization method, wherein nano-grade ZIF-8 particles are added into an m-phenylenediamine aqueous solution and/or a trimesoyl hexane solution; a polyamide ultrathin skin layer, to which ZIF-8 is added, is formed through interfacial polymerization. The preparation method has the advantages that by the use of a ZIF-8 nano-grade aperture and a three-dimensional multi-hole structure, the selectivity or the permeability of the aromatic polyamide film is improved; the prepared ZIF-8 filling polyamide composite film can serve as a nanofiltration or reverse osmosis film for removing organic matters from the aqueous solution; when the adding ratio of an organic phase or water phase solution, to which ZIF-8 is added, is 0.05-0.15% (w/v), the performance of the film is the highest, and the permeation flux and the retention rate can be increased at the same time; furthermore, the nanofiltration or reverse osmosis performance of the two-phase adding film is higher than that of a single-phase adding film.

This invention relates to a process for the aromatization of C₆ to C₁₂ alkanes, such as hexane, heptane and octane, to aromatics, such as benzene, ethyl benzene, toluene and xylenes, with a germanium-containing zeolite catalyst. The catalyst is a non-acidic aluminum-silicon-germanium zeolite on which a noble metal, such as platinum, has been deposited. The zeolite structure may be of MFI, BEA, MOR, LTL or MTT. The zeolite is made non-acidic by being base-exchanged with an alkali metal or alkaline earth metal, such as cesium, potassium, sodium, rubidium, barium, calcium, magnesium and mixtures thereof, to reduce acidity. The catalyst is sulfur tolerant and may be pretreated with a sulfur compound, i.e., sulfided. The hydrocarbon feed may contain sulfur up to 1000 ppm. The present invention could be applicable to a feedstream which is predominantly paraffinic and/or low in naphthenes. Lowering the hydrogen to hydrocarbon ratio increases conversion and aromatics selectivity.

Electronic packaging films, tapes, bags and pouches having excellent optical properties and heat sealability, low hexane extractables and a good balance of physical properties may be prepared from linear low density polyethylene having a melt flow ratio (I₂₁/I₂) from about 23 to about 32, prepared in a tandem dual reactor solution phase polymerization in the presence of a phosphinimine catalyst and a co-catalyst system which comprises an aluminum based co-catalyst, an ionic activator or a mixture thereof.

The invention belongs to the technical field of preparation of semiconductor nanomaterials and discloses a single-size CsPbX3 perovskite nanocrystalline preparation method. The method includes: adding cesium carboxylate solution into N2 protected lead bromide solution to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline; scattering the single-size CsPbX3 perovskite nanocrystalline into normal hexane, and gradually adding lead chloride solution or lead iodide solution drop by drop to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline. The single-size CsPbX3 perovskite nanocrystalline preparation method has the advantages of simplicity in operation, easiness in size adjustment of products, component controllability and the like.

The invention discloses an underwater super-oleophobic oil-water separation mesh membrane and a preparation method thereof. The oil-water separation mesh membrane is prepared by coating a micron-thickness chitosan-based polymer coating layer on the mesh wire of a fabric mesh with 100-400 meshes. The oil-water separation mesh membrane is provided with micrometer-scale meshes and the chitosan-based polymer coating layer is provided with protruding structures with a nanoscale width. The preparation method of the oil-water separation mesh membrane comprises the following steps of: (1) cleaning and drying the fabric mesh; (2) dissolving a chitosan-based polymer in acid solution and stirring evenly to obtain mixed solution; (3) immersing the cleaned and dried fabric mesh in the mixed solution, taking out and drying the fabric mesh; and (4) immersing the fabric mesh obtained by the step (3) in alkaline solution, taking out and drying the fabric mesh to obtain the oil-water separation mesh membrane. The oil-water separation mesh membrane provided by the invention has the advantages of large water flux, high oil-water separation speed and good oil-water separation effect, is applicable to treatment of sewage with high oil content, and has good separation effect on normal hexane, petroleum ether, dichloroethane, benzene, animal and vegetable oils and the like.

The invention discloses a method for preparing alkane by high fatty acid ester, which is characterized in that liquid-phase catalytic hydrogenation deoxidation is carried out on the high fatty acid ester to obtain the alkane. The high fatty acid ester, catalyst and solvent are added into a reactor, then hydrogen is charged into the reactor with reaction pressure at 1-10MPa and temperature at 210-320 DEG C, and the reaction time is 4-7h; the high fatty acid ester is fatty acid methyl ester containing 8-22 carbon atoms or fatty acid ethyl ester containing 8-22 carbon atoms; catalyst uses a multi-wall carbon nanotube as carrier and 2-10% of palladium in percentage by weight as active component ; the solvent is one of n-hexane, n-heptane, n-octane, dodecane, or hexadecane. In the invention, the preparation process is simple, the reaction temperature is low, the usage of solvent is less, the combustion high value of the target product is high, and the catalyst can be recycled.

The invention provides a high-selectivity catalyst system used in trimerization and tetramerization of ethylene and a use method thereof. The catalyst system includes three components: (1) a chromium compound, (2) a ligand, of which a general structure formula is (Ph2)P-N(R1)-P(Ph2), wherein R1 is a synthetic phenyl group, alkyl group or cycloalkyl group; and (3) an activating agent or a co-catalyst. According to the catalyst system, a conventional PNP chromium-series catalyst is improved so that a co-selectivity of 1-hexane and 1-octylene is increased, wax-like products are reduced and a high activity is maintained.

Methods of treating dehulled or hull-less oat, i.e. oat groats, to produce oat pearlings, oat flour and oat bran products are described. Oat groats are abrasion milled to remove up to 15% by weight and produce pearled oat groats and pearlings. The pearlings are extracted sequentially with aqueous ethanol and hexane to produce an anti-irritant and a light oat oil, or with hexane to produce a dark oat oil and lipase. The pearled oat groats are steeped in an aqueous medium for up to 4 hours and then macerated to produce an enriched oat bran, from which an enriched beta glucan may be extracted; a refined oat flour, from which oat starch and oat protein may be extracted; and a pearled oat groat extract from which further products, such as an oat anti-irritant can be recovered.

An azeotrope-like mixture consisting essentially of chlorotrifluoropropene and at least one component selected from the group consisting of pentane, hexane, methanol, and trans-1,2-dichloroethene.

The present invention relates to an automatic refining apparatus for separating target materials from a plurality of biological sample solutions by using magnetic particles to which the magnetic particles are to be reversibly coupled, and to a multi-well plate kit for use in the automatic refining apparatus. Further, the present invention relates to a method for extracting nucleic acids from biological samples by using the above-described automatic refining apparatus. The present invention can be used in the automatic separation of nucleic acid, protein, and the like from biological samples.

Disclosed herein are mixtures of turmeric extract oils. One mixture of turmeric oils is the hexane soluble fraction obtained by dissolving turmeric powder in hexane to form a hexane mixture, filtering the hexane mixture and evaporating the hexane from the turmeric oil mixture. A more refined turmeric oil combination is the oil left after the turmeric oil mixture is dissolved in hexane, placed on a silica gel/hexane chromatography column, and eluted with hexane into fractions that were then evaporated, thereby leaving the refined turmeric oil combination. Also disclosed are methods for treating inflammation, arthritis and rheumatoid arthritis and a pharmaceutical dosage form of the refined turmeric oil combination.

The invention discloses a heat-conducting electric insulation silicon rubber thermal interface material and a preparation method thereof and belongs to the technical field of rubber nanocomposite materials. The preparation method comprises the following steps: treating graphene by employing a surfactant, ultrasonically dispersing the graphene into a relatively thin and uniform nano sheet structure, compounding the graphene with spherical aluminum oxide, adding compounded packing into raw silicon rubber dissolved by normal hexane for uniformly mixing, drying, adding a cross-linking agent, a catalyst and a polymerization inhibitor, vulcanizing and performing compression molding to obtain the heat-conducting electric insulation silicon rubber thermal interface material. The graphene is subjected to the surface treatment and is ultrasonically dispersed into a relatively thin sheet structure, and the formation of a heat-conducting network is promoted; moreover, due to the addition of a small amount of treated graphene, the heat-conducting performance can be greatly improved, the influence on the hardness of a composite material is small, and the composite material can reach an insulating level by controlling the amount of the graphene, so that the heat-conducting electric insulation silicon rubber thermal interface material can be applied to electronic products.

The invention provides a two-step decolorization method for phospholipid. The method comprises the following steps of: dissolving the phospholipid by using n-hexane as a solvent, adding a proper amount of hydrogen peroxide into the mixed phospholipid for oxidation and decolorization, and removing most pigment; and performing vacuum heating to remove un-reacted hydrogen peroxide and solvent, adding n-hexane to dissolve the phospholipid in a certain ratio, adding chromatography silica gel in a certain ratio, reacting with stirring, adsorbing peroxide, impurities and partial pigment in the phospholipid, filtering, desolventizing, and thus obtaining decolorized phospholipid. By adopting two-step decolorization, on the premise that the decolorization effect is ensured, the consumption of the hydrogen peroxide is reduced by over 30 percent, and the oxidation degree of the phospholipid in the decolorization process is effectively reduced; and by the adsorption effect of the silica gel, the acid value and the peroxide value of the phospholipid are further reduced, the transparency of the phospholipid is improved, and the quality of the product is effectively improved.