37results about How to "Reduce the amount of solvent used" patented technology

The present invention relates to a preparation process of nanofiltering polyimide membrane for recovering lubricant oil acetone-benzene dewaxing solvent. The preparation process includes the following steps: preparing polyamic acid solution, adding additive for phase transfer to prepare nanofiltering polyamic acid membrane, imidating the membrane chemically, solvent exchanging and heat treatment. Or, the preparation process may include the following steps: the first preparing partially imidated polyimide capable of being dissolved in some solvents, preparing film casting solution, filming in a phase transfer process, solvent exchanging and heat treatment. The present invention has low preparation cost, and the prepared nanofiltering polyimide membrane has lubricant oil intercepting rate greater than 90 % and mixed acetone-benzene solvent flux greater than 12 L/sq m .hr at the conditions of -18 deg.c and 3 MPa.

Described is a way to reduce solvent usage in solvent-dominated oil recovery processes through the use of an emulsion. Injection of an emulsion into an oil reservoir is performed as an alternative or supplement to solvent injection to minimize solvent usage per unit amount of oil recovered. The emulsion may contain solvent and the solvent may form an external-phase of the emulsion. A solvent-external emulsion may be injected and formed using an aqueous liquid or a gas as the internal phase. The emulsion may be an aqueous-external, vapor-internal emulsion with solvent being injected separately or simultaneously. Polymer may be added to viscosify the emulsions and use them for flow diversion in a solvent-dominated process.

A system of applying liquid flavor to cut tobacco material includes a first tank of concentrated liquid flavor and a second tank of water. A venturi device is constructed and arranged to receive and meter concentrated liquid flavor and water from the first and second tanks and to discharge mixed flavor and water from an outlet end. A first line is connected between the first tank and a suction port on the venturi device, and a second line is connected between the second tank and an intake port on the venturi device. A spray assembly is in fluid communication with the discharge outlet of the venturi device for applying mixed flavor and water to cut tobacco.

The invention provides a continuous cellulose aerogel fiber and a preparation method thereof. The preparation method comprises the following steps: dispersing cellulose into a dispersing agent so as to obtain a spinning stock solution; extruding the spinning stock solution into a coagulating bath for wet-method spinning so as to obtain cellulose aerogel fiber; winding the cellulose aerogel fiber in the coagulating bath, and soaking into an aging liquid for aging; washing the aged cellulose aerogel fiber till the pH is neutral, and drying, so as to obtain the continuous cellulose aerogel fiber. The preparation method provided by the invention has the characteristics that raw materials are cheap and easy to obtain, the preparation process is simple, green and pollution-free, the continuous cellulose aerogel fiber is good is spinnability, and the problem that cellulose aerogel is hard to spin into fiber is solved. The diameter of the cellulose aerogel fiber provided by the invention is smaller than 120 [mu]m, the cellulose aerogel fiber has the characteristics of high specific surface area (greater than or equal to 88m<2>/g), high porosity (greater than or equal to 85%), and low density (less than or equal to 0.2/cm<3>), meanwhile the fiber specific surface area can be adjusted, and the cellulose aerogel fiber can be used in fields such as functional clothes, sensing, catalyst loading and adsorption filtration, cosmetics and biological treatment.

A method of depositing or etching a micro- or nano-scale pattern on a work piece is disclosed, including the steps of: (a) placing the work piece in an electrochemical reactor in close proximity to a patterned tool; (b) connecting the work piece such that it is the anode if is to be etched or the cathode if it is to be deposited, and the patterned tool such that it is the counter electrode; (c) pumping electrolytic fluid necessary for the electrolytic operation of the cell formed between the two electrodes; and (d) applying a current across the electrodes to etch or deposit the work piece.

Polyimidazoline molecules and methods of making them are provided. A representative polyimidazoline has a structure:

Compositions of P4HB with high purity have been developed. The compositions are prepared by washing P4HB biomass prior to solvent extraction, and precipitating P4HB from solution. The same solvent is preferably used to wash the P4HB biomass, and as a non-solvent to precipitate the polymer from a P4HB solvent solution. The highly pure P4HB compositions are suitable for preparing implants. The implants may be used for the repair of soft and hard tissues.

A system atomizes liquids into a gaseous medium for formation and injection of a sample into an analytical apparatus, such as a plasma spectrometer. The system employs a high efficiency nebulizer that generates a fine aerosol through use of a nozzle having improved surface wetness characteristics, preferably in combination with a deflecting surface. A desolvator is employed to remove excess solvent from the atomized sample prior to injection into the spectrometer to avoid temperature reduction or extinguishment of the plasma by the sample.

The invention generally relates to methods and devices for synchronization of ion generation with cycling of a discontinuous atmospheric interface. In certain embodiments, the invention provides a system for analyzing a sample that includes a mass spectrometry probe that generates sample ions, a discontinuous atmospheric interface, and a mass analyzer, in which the system is configured such that ion formation is synchronized with cycling of the discontinuous atmospheric interface.

A bladeless mixer/mill for agitating and mixing a compound/product. The mixer/mill comprises a driving shaft rotatable about a first vertical axis of rotation, and a motor unit operatively coupled to the driving shaft for rotating the same. A support plate is mounted onto the driving shaft and is rotatable about the first vertical axis. The mixer/mill also has a stationary ring gear coaxial to the support plate. The stationary ring gear has a portion with an inner surface extending above the support plate. At least one pinion gear is rotatably mounted onto the support plate about a second vertical axis of rotation parallel to the first vertical axis of rotation. The pinion gear has an outer surface complementary to the inner surface of the stationary ring gear. The outer surface of the pinion gear meshes with the inner surface of the stationary ring gear. The pinion gear has a cavity wherein the compound/product to be agitated and mixed/milled is inserted.

The invention discloses a method for producing ametryn. The method is characterized in that the ametryn is prepared from raw materials atrazine and sodium methyl mercaptide by virtue of a reaction with water as a solvent and quaternary ammonium salt as a phase transfer catalyst, wherein the molar ratio of the atrazine to the sodium methyl mercaptide is 1: 1.05 to 1: 1.15; the ratio of the atrazine to the water is 1: 2 to 1: 4; the ratio of the quaternary ammonium salt to the atrazine is 1: 20 to 1: 200; the reaction temperature ranges from 90 to 100 DEG C; and the reaction time ranges from 2 to 5 hours. According to the method for producing the ametryn, the water is taken as the solvent, and compared with a traditional method for synthesizing the ametryn, the dosage of the solvent is reduced, the production cost is reduced, the safety of the reaction process is improved, and meanwhile, the generation of three wastes is reduced, and therefore, the method for producing the ametryn has a higher industrial value.

Compositions of P4HB with high purity have been developed. The compositions are prepared by washing P4HB biomass prior to solvent extraction, and precipitating P4HB from solution. The same solvent is preferably used to wash the P4HB biomass, and as a non-solvent to precipitate the polymer from a P4HB solvent solution. The highly pure P4HB compositions are suitable for preparing implants. The implants may be used for the repair of soft and hard tissues.

A method for decolorization of a dyed polyester fiber is provided. The method for decolorization of a dyed polyester fiber includes step of: providing an ether-alcohol solvent and a polyester fiber containing a dye; heating the ether-alcohol solvent up to a boiling point of the ether-alcohol solvent to continuingly generate a fresh gas; wherein a temperature of the fresh gas ranges from 90° C. to 200° C. which is between a glass transition temperature of the polyester fiber and a melting point of the polyester fiber; extracting the dye from the polyester fiber via the fresh gas and forming an extracting condensate containing the dye; reflowing the extracting condensate back into the ether-alcohol solvent; repeating the steps mentioned above to obtain a decolorized polyester fiber.

The invention relates to a separation and purification method for 2,6-diisopropylnaphthalene. The method is mainly used for solving the technical problem that the product purity is low when 2,6-diisopropylnaphthalene is separated and purified in the prior art. According to the adopted technical scheme, the method comprises the following steps that a liquid mixture containing 2,6-diisopropylnaphthalene enters a rectifying tower, naphthalene, isopropylnaphthalene and other light components are removed, the light-component-removed materials enter a first crystallizer, a material flow containing crude 2,6-diisopropylnaphthalene crystals is obtained through a suspension crystallization process, the crude crystals enter a second crystallizer, and a material flow containing the high-purity 2,6-diisopropylnaphthalene product is obtained through a solvent crystallization, washing and drying process. Accordingly, the technical problem is well solved, and the method can be used in industrial production for separating and purifying 2,6-diisopropylnaphthalene.

The invention relates to a method for refining 2,6-diisopropylnaphthalene, and is used for mainly solving the technical problems of low purity and low yield of products during separation and purification of 2,6-diisopropylnaphthalene in the prior art. The technical problems are relatively well solved by adopting the technical scheme comprising that the method comprises the following steps: allowing an isopropylnaphthalene mixed material liquid from a reaction unit to enter a rectifying tower, removing naphthalene, monoisopropylnaphthalene and other light components, then allowing the product to enter a primary crystallization unit, and carrying out suspension crystallization to obtain a crude 2,6-diisopropylnaphthalene crystal; allowing the crude crystal to enter a secondary crystallization unit, carrying out solvent crystallization, washing and drying to obtain the high-purity 2,6-diisopropylnaphthalene product; circulating the light components of the refining process, a primary crystallization mother liquor and a secondary crystallization mother liquor having a solvent removed back to the reaction unit, continuing to carry out the reaction to generate 2,6-diisopropylnaphthalene. The method can be used for industrial production of separation and purification of 2,6-diisopropylnaphthalene.