24593 results about "Acetone" patented technology

A process for producing and recovering light alcohols, particularly ethanol, alcohol mixtures containing ethanol, and ABE mixtures (alcohol mixtures containing acetone, butanol and ethanol), using a combination of steps including fermentation, first membrane separation, dephlegmation and dehydration by second membrane separation.

A continuous process for production of solvents, particularly acetone-butanol-ethanol (ABE) using fermentation of solventogenic microorganisms and gas stripping is provided. The solventogenic microorganisms are inoculated in a nutrient medium containing assimilable carbohydrates (substrate) and optional other additives. Control of the solventogenic microorganism concentration in the fermentor (cell concentration) and the assimilable carbohydrate concentration in the fermentor, along with removal of solvents formed results in a continuous process for production of solvents.

PCT No. PCT/CN97/00004 Sec. 371 Date Sep. 17, 1998 Sec. 102(e) Date Sep. 17, 1998 PCT Filed Jan. 20, 1997 PCT Pub. No. WO97/25968 PCT Pub. Date Jul. 24, 1997The invention relates to a tooth-whitening varnish composition, comprising 6-20% of carbamide peroxide, 2-9% of film forming agent and 77-88% of volatile organic solvent, based on the total weight of the composition. The volatile organic solvent is selected from ether, ethylacetate, ethyl alcohol, or acetone. The film forming agent is artificial or natural material selected from cellulose, polyvinyl, butyral, coumarone resin or shellac. The composition can rapidly form films on dry tooth surfaces, and a remarkable tooth-whitening effect can be obtained.

The present invention provides a water based, low VOC super hydrophobic coating composition that can be used to make wet and dry dirt repellent surfaces to keep the surfaces clean for a reasonable period of time. The coating utilizes hydrophobic nanoparticles dispersed in water. This treatment produces a virtually transparent coating releasing very little or no VOC compounds whereas previous coatings of comparable hydrophobicity release up to 99 percent VOC compounds. The coating can be applied by a simple, single application method and the super hydrophobic property can be achieved by drying at room temperature for 5 to 10 minutes. A preferred coating can be easily removed and renewed when desired. The aqueous hydrophobic self cleaning coating composition that can be applied by conventional methods such as by spraying the composition onto a surface creating a wet and dry dirt repellent coating on the surface. The hydrophobic self cleaning coatings are used on exterior automotive and boat surfaces, and in many other applications, to produce a self cleaning surface, reduce adherence of dirt and contaminants to a treated surface, and reduce drag in some applications providing an energy savings. The coating solves the problem of poor resistance to UV light, opaque appearance, and/or abrasion found in previous coatings of similar nature. A preferred coating has good resistance to UV light and some resistance to abrasion. Clear, nearly transparent and translucent coatings are produced as compared to conventional coatings of comparable hydrophobicity which are typically white or opaque. The coating can be applied by a single and easy spraying method and the super hydrophobic property can be achieved by drying the film by evaporation of the solvent wetting solution and water based carrier at ambient temperature for 5 to 10 minutes. Embodiments of the hydrophobic self-cleaning coating composition can be produced resulting in a clear coating or in some cases a translucent dirt repellant film or coating on painted material, plastic, metal, glass, ceramic, fiberglass or a polymer substrate. The coating typically utilizes hydrophobic nanoparticles of fumed silica and/or titania wetted by a hydrophilic solvent such as acetone for no VOC applications, or with mineral spirits, alcohol or a light distillate if VOC are not a consideration, together with a selected surfactant typically having an HLB value in a range of from 9 to 13.

At least one preferred coating composition comprising an effective amount of a treated fumed silica wetted with a solvent and dispersed in water, upon drying, resulted in a coated surface providing a contact angle of at least 165 degrees and a surface energy below 12 dynes/centimeter as compared to water having a contact angle of from 65 to 80 degrees on a noncoated surface. The composition imparts a degree of hydrophobicity to a surface so that the surface will have a tilt angle of sliding of less than 2 degrees as compared to water on a noncoated surface having a tilt angle of sliding of 90 degrees or higher. The coating composition is removed by washing with a detergent or applying pressure to the coating wiping same from the treated surface. Exposure to water in the form of rain or snow does not remove the coating composition.

The invention discloses a quick and efficient synthesis method for silver nanowires. The method comprises the following steps of: 1) introducing inert gas into a reactor, adding 2 volume parts of glycol into the reactor, and stirring, heating, condensing and refluxing the glycol; quickly adding 1 volume part of glycol solution of silver nitrate at molar concentration of between 0.1 and 0.5m into the reactor; slowly dropwise adding 1 to 2 volume parts of PVP at molar concentration of between 0.15 and 0.75m and 4 to 32 mu m of glycol solution of MnCl2 at the same time; and reacting and cooling the mixture to the room temperature to obtain reaction mother liquor of the silver nanowires; and 2) transferring the reaction mother liquor of the silver nanowires into a centrifugal tube; adding acetone into the centrifugal tube and performing centrifugal separation to remove supernatant and retain precipitate; adding de-ionized water or ethanol into the centrifugal tube and performing centrifugal separation to remove the supernatant and retain precipitate, and repeating the operation for 1 to 3 times; and extracting and dispersing the precipitate with ethanol to obtain the silver nanowires. The method shortens the reaction time and also has high selectivity for the synthesis of the silver nanowires under conditions of high concentration.

The invention provides a PVDF-coated lithium-ion battery separator and a preparation method thereof. The PVDF-coated lithium-ion battery separator comprises a base film and a coating, wherein the coating coats a single side or double sides of the base film; the coating is obtained by coating and drying slurry; and the coating is 0.1-0.5 micron in thickness and contains evenly arranged PVDF spherical particles. According to the PVDF-coated lithium-ion battery separator, a traditional technology that an existing PVDF-coated lithium-ion battery separator takes oil substances of acetone and the like as solvents is abandoned. Water is adopted as the solvent of a PVDF material; and no a thickening agent is added, so that the low-viscosity water-based PVDF coating slurry is obtained; an ultra-thin coating of which the PVDF particles are regularly arranged and which is relatively loose is obtained after the slurry is coated; the ultra-thin coating improves the hardness of a pole piece and the effective utilization space of the battery when effectively bonded to the lithium-ion battery separator and the pole piece; and the ventilation loss caused by the thickness of the coating is reduced.

The large-area untrathin nano carbon tube film with well feature in microcosmic level comprises nano carbon tubes with centimeter-level length and more then 90wt% purity. Wherein, the least thickness of single-layer film can achieve 20nm with near transparent color and more then 10cm2 film area; there are multiple functional groups on tube surface. It also discloses the opposite preparation technique: with the macroscopic body of nano carbon tube, oxidating the macroscopic body in air; then, dipping into hydroperoxide; adding strong acid to poach till the liquid shows neutrality; finally, adding alcohol or acetone into the liquid to float the tube and form the film.

This invention relates to a method of making flat sheet asymmetric membranes, including cellulose diacetate/cellulose triacetate blended membranes, polyimide membranes, and polyimide/polyethersulfone blended membranes by formulating the polymer or the blended polymers dopes in a dual solvent mixture containing 1,3 dioxolane and a second solvent, such as N,N′-methylpyrrolidinone (NMP). The dopes are tailored to be closed to the point of phase separation with or without suitable non-solvent additives such as methanol, acetone, decane or a mixture of these non-solvents. The flat sheet asymmetric membranes are cast by the phase inversion processes using water as the coagulation bath and annealing bath. The dried membranes are coated with UV curable silicone rubber. The resulting asymmetric membranes exhibit excellent permeability and selectivity compared to the intrinsic dense film performances.

The invention provides a preparation method of dispersible silane functionalized graphene. The method comprises the steps of: conducting ultrasonic dispersion to graphene oxide in absolute ethyl alcohol so as to form a uniform graphene oxide dispersion solution, then adjusting the pH value to 3-4, or under the protection of an inert atmosphere, adding silane into the dispersing solution for modification, with silane and graphene oxide in a mass ratio of 0.1:1-5:1, continuing the reaction for 12h-48h at a temperature ranging from normal temperature to 78DEG C, carrying out centrifugation, then adding hydrazine hydrate to the obtained solid, performing heating reduction, and filtering the reaction solution, then washing and drying the filter cake, thus obtaining dispersible silane functionalized grapheme. The method of the invention is simple and practicable, and the obtained silane functionalized grapheme has good dispersibility in solvents like absolute ethyl alcohol, acetone, toluene, ethyl acetate, butyl acetate, and tetrahydrofuran (THF), etc.

Methods and apparatus for broad tuning of single wavelength quantum cascade lasers and the use of light output from such lasers for highly sensitive detection of trace gases such as nitrogen dioxide, acetylene, and vapors of explosives such as trinitrotoluene (TNT) and triacetone triperoxide (TATP) and TATP's precursors including acetone and hydrogen peroxide. These methods and apparatus are also suitable for high sensitivity, high selectivity detection of other chemical compounds including chemical warfare agents and toxic industrial chemicals. A quantum cascade laser (QCL) system that better achieves single mode, continuous, mode-hop free tuning for use in L-PAS (laser photoacoustic spectroscopy) by independently coordinating gain chip current, diffraction grating angle and external cavity length is described. An all mechanical method that achieves similar performance is also described. Additionally, methods for improving the sensor performance by critical selection of wavelengths are presented.

The present invention relates to a catalyst composition for ethylene oligomerization and the use thereof. Such catalyst composition includes chromium compound, ligand containing P and N, activator and accelerator; wherein the chromium compound is selected from the group consisting of acetyl acetone chromium, THF-chromium chloride and/or Cr(2-ethylhecanoate)₃; general formula of the ligand containing P and N is shown as:

in which R₁, R₂, R₃ and R₄ are phenyl, benzyl, or naphthyl. R₅ is isopropyl, butyl, cyclopropyl, cyclopentyl, cyclohexyl or fluorenyl; the activatior is methyl aluminoxane, ethyl aluminoxane, propyl aluminoxane and/or butyl aluminoxane; general formula of the accelerator is X₁R₆X₂, in which X₁ and X₂ are F, Cl, Br, I or alkoxyl, R₆ is alkyl or aryl; the molar ratio of a, b, c and d is 1:0.5˜10:50˜3000:0.5˜10. After mixing the four components mentioned previously under nitrogen atmosphere for 10 minutes, they are incorporated to the reactor, or these four components are incorporated directly into the reactor. Then ethylene is introduced for oligomerization. Such catalyst can be used in producing 1-octene through ethylene oligomerization. It is advantageous in high catalysing activity, high 1-octene selectivity, etc. The catalytic activity is more than 1.0×10⁶ g product·mol⁻¹ Cr ·h⁻¹, the fraction of C₈ linear α-olefin is more than 70% by mass.

A process for the extraction and purification of Paclitaxel from a natural source of taxanes, comprising extracting Paclitaxel with an organic solvent from a natural source of taxanes, and treating the raw material with a base or an acid to obtain a biomass by precipitation. The biomass is isolated and dried, and resin and natural pigments are removed. The biomass is then dissolved in acetone and at least one non-polar solvent is added, until a Paclitaxel-enriched oily phase is obtained. The Paclitaxel-enriched oily phase is then treated with a base or an acid to obtain a second biomass, which is recovered by precipitation and dried. A solution of the second biomass in a volatile solvent is chromatographically purified at least once and crystallized.

The invention provides a method for preparing high-heat-conductivity conductive adhesive containing graphene. The method comprises the steps of (1) functionalizing surface of graphene, namely adding graphene to acetone solution of an organic matter containing a conjugate ring, and strongly ultrasonically shaking for 6-48 hours at 40-100 DEG C to form non-covalent modified graphene; (2) mixing epoxy resin with an epoxy diluent for 3-30 minutes at room temperature to obtain a mixture of epoxy resin and the epoxy diluent, and sequentially adding metal powder and a coupling agent to the mixture; (3) adding the non-covalent modified graphene prepared in the step (1) to the mixture in the step (2); and (4) adding a curing agent to the mixture in the step (3) to prepare the even conductive adhesive. The method has the advantages that dispersing and enhancing interface joint in an epoxy system are facilitated by functionalizing the surface of graphene by a non-covalent bond; and then graphene is mixed with metal powder to obtain the high-heat-conductivity conductive adhesive. The high-heat-conductivity conductive adhesive has the application prospect in a high-power apparatus.

The invention relates to a method for recovering a carbon-fiber enhanced epoxy resin composite material. In the existing method, the requirement for equipment is high and the recovery cost is large. The method comprises the following steps of: cutting materials needing to be decomposed into blocks with the volume being 5cm<3>, putting the blocks in a backflow device containing acid liquor, heating for 5-20 minutes at the temperature of boiling point, cleaning and carrying out vacuum drying; then putting the obtained mixture into a reaction kettle, adding an organic solvent and an oxidizing agent, firstly heating, then cooling to normal temperature, and obtaining a primary product; and after cleaning, putting a solid product in the primary product into industrial acetone solution for dipping, obtaining recovered carbon fiber and carrying out pressure-reduced distillation on a liquid product to obtain phenol and derivatives thereof. In the method, reaction under low temperature and low pressure is realized and has the advantages of moderate reaction condition, easy control of reaction, fewer side products, no pollution basically and no corrosion to equipment and the like, so that the method is a green recovering method.

The invention involves an aluminum or aluminum alloy super-hydrophobic surface preparation method. The method is: polishing the surface of aluminum or aluminum alloy using metallographic sandpaper or polishing paste, pure water washing, acetone ultrasonic cleaning, pure water washing and other clean treatment, handing it with chemical etching solution containing nitric acid and metal salts (copper or nickel salt) 30s-20min under 90 ~ 100 degree C, then coating low surface energy material on its surface to get super-hydrophobic property. The aluminum or aluminum alloy surface treated by the invention has excellent hydrophobicity, the contact angle of water and surface can be as high as 150-165 degree, droplets are easy to roll on the surface. The method of the invention need not complex equipment, cost is low, technology is simple and repeatability is good.

An azeotrope-like mixture consisting essentially of chlorotrifluoropropene and at least one component selected from the group consisting of a C₁-C₃ alcohol, a C₅-C₆ hydrocarbon, a halogenated hydrocarbon, methylal, methyl acetone, water, nitromethane, and combinations thereof.

The making of Fe-6.5Si alloy magnetic powder core comprises grain proportion, alloy powder inactivating, adding insulation agent to the metal powder, binder, lubricant and stripping agent, compression, heat treatment, solidification, surface coating, with the inactivating treatment getting phosphopyruvic acid with 5-15% phosphate chrome, the rest being acetone, adding alloy powder with 2-6% of mass percentage. Adding small quantity Ti nor Ni, it can reach the saturated alloy magnetic sensing strength BS value of 16000- 18000 Gaussian, coercitive force <=80A/m. It has better forming and compression feature. It reduces broken stress. The made magnetic powder core having magnetic conductivity of 125, with low metal core consumption.

The normal pressure poly(ether-ether-ketone) purifying process includes the technological steps of purification, suction filtering and washing, and drying. During purification, metered poly(ether-ether-ketone) and metered organic solvent and surfactant used as purifying treating agent and purifying assistant separately inside reactor are heated at normal pressure to the temperature between the vitrification point of poly(ether-ether-ketone) and the boiling point of the purifying treating agent for purification for at least 1 hr. Then, the temperature is lowered to below 100 deg.c, and the product is suction filtered, washed with boiling acetone, absolute alcohol and deionized water, and dried to obtain high purity poly(ether-ether-ketone) product. The said process can lower the content of inorganic ion in poly(ether-ether-ketone) product.