3965 results about "Supercritical carbon dioxide" patented technology

A method of enhancing removal of photoresist and/or resist residue from a substrate includes exposing the substrate to an environmentally friendly, non-hazardous co-solvent mixture comprising a carbonate, an oxidizer and an accelerator. The stripping process may be performed under ambient conditions, or in the presence of a supercritical fluid such as supercritical carbon dioxide with the supercritical cleaning step itself being a desirable "green" process. In one embodiment, the co-solvent mixture includes propylene carbonate, benzyl alcohol, hydrogen peroxide and an accelerator such as formic acid. If desired, supercritical carbon dioxide in combination with a second co-solvent mixture may be subsequently applied to the substrate to rinse and dry the substrate. In one embodiment, the second co-solvent mixture includes a lower alkyl alcohol such as isopropyl alcohol.

The invention relates to a supercritical carbon dioxide drive physical analogue device, which belongs to the technical field of petroleum engineering and technology. The device adopts two paratactic simulation core devices to be connected with an injecting system, and each simulation core device is provided with an outlet measuring system; the injecting system injects formation water, crude oil and supercritical carbon dioxide to the simulation core devices, and a temperature and pressure measuring and controlling system is adopted to control the temperature set value and the pressure value of the whole system, and the outlet measuring system is adopted to measure the volumes of the carbon dioxide, the formation water and the crude oil which pass through the simulation core devices. After the CO2 gas is cooled and liquefied, the CO2 gas is pressurized and heated up to the supercriticality, and the difficulty of the accurate measurement of the injected CO2 flow; by adopting a double-tube model, the fingering and cross flow phenomenon during the driving process of the heterogeneous reservoir CO2 can be simulated; the design pressure of the device is 0 to 40 MPa, the design temperature is 0 to 180 DEG C, and the device is mainly applied to the research on supercritical CO2 miscible drive, non-miscible drive, continues gas drive or water and gas alternate drive.

A carbon dioxide drive nuclear magnetic resonance imaging detection device belongs to the technical field of petroleum engineering and technology. The detection device comprises: a simulation core device which is arranged in a nuclear magnetic resonance imaging device; an injection system which sequentially injects formation water, crude oil and supercritical carbon oxide into the simulation core device; a measurement and control system which is employed to control pressure and temperature of the whole system; the nuclear magnetic resonance imaging device which is employed to detect and perform quantitative analysis on an image to be tested to obtain voidage and permeability of a porous medium, and saturation seepage parameters of the supercritical carbon oxide, the formation water and the crude oil; and an output measuring system which is employed to measure volumes of the carbon dioxide gas, the formation water and the crude oil. The detection device has a design pressure of 0-40MPa and design temperature of 0-180 DEG C, and can simulate experimental studies of different displacement schemes of the supercritical CO2 under a complex petroleum reservoir condition; the simulation core device is made of a brass material, which produces no magnetism, satisfies requirements for high pressure and strength, has a compact structure, can be recycled, is conveniently operated, simple and applicable in an experimentation.

A method of removing photoresist and/or resist residue from a substrate includes exposing the substrate to a supercritical fluid in combination with a co-solvent mixture comprising an organic solvent and an oxidizer. In one embodiment, the supercritical fluid is supercritical carbon dioxide and the co-solvent mixture includes 1,2-Butylene Carbonate, Dimethyl Sulfoxide and hydrogen peroxide. If desired, supercritical carbon dioxide in combination with a second co-solvent mixture may be subsequently applied to the substrate to rinse and dry the substrate. In one embodiment, the second co-solvent mixture includes isopropyl alcohol.

The invention relates to the using of low temperature heat for the production of electrical energy by using of supercritical carbon dioxide as working fluid.

It included a process and a device for process realizing with higher efficiency in relation to other known processes and with a wide temperature working range. This is related to a wider adjustability which allows an optimal operation both in summer and in winter operation without technical or constructional changes. The process is realizable without damages to the environment and is realizable with low effort. The relative emission of carbon dioxide is reduced in relation to other processes.

Low temperature heat from a given heat source (1) is taken off by carbon dioxide at high supercritical pressure as heat transfer and working fluid in the process. Then the heated fluid is expanding in an expansion machine (2), which is connected with a generator (3) for the production of electric power. In this process the fluid will be cooled, then liquefied by using of a cold source (4) and in liquid state compressed to the working pressure.

The invention relates to a method for preparing large-scale graphene through supercritical carbon dioxide exfoliation. Supercritical carbon dioxide is adopted as an exfoliant, a surfactant is adopted as a dispersant, graphite powder and the dispersant are put in an autoclave, the carbon dioxide is pumped in the autoclave and circularly flows in a supercritical state, and then the pressure is reduced quickly to be normal pressure; the process is repeated so that the materials undergo pressure increment and pressure reduction several times; and the layers of the graphene is controlled by controlling the times of pressure increment and pressure reduction, so as to prepare the large scale graphene. Compared with the prior art, the invention has the advantages as follows: large-scale (hundreds of micrometers) high-quality graphene can be prepared; the method belongs to physical exfoliation, the treatment conditions are mild, and the quality of the graphene cannot be damaged; besides, the carbon dioxide used in the method is nontoxic, cheap and easy to obtain, and the technology is simple.

The invention discloses low-cost green cellulose aerogel and a preparation method for hybrid aerogel thereof. The preparation method for the hybrid aerogel of the cellulose aerogel comprises the following steps that cellulose is dissolved into a zinc chloride aqueous solution, centrifugal deaeration is performed, and a uniform and transparent cellulose solution is obtained; the cellulose solution is formed, then the formed cellulose solution is placed into a coagulating bath to be regenerated, in addition, the regenerated cellulose solution is fully washed by use of a solvent, and cellulose solvent gel is obtained; the solvent in the cellulose solvent gel is removed by use of supercritical carbon dioxide drying or freeze drying, and the cellulose aerogel is obtained. Functional filler can be added into the cellulose solution to obtain the hybrid aerogel. By the adoption of different solution forming methods, the cellulose aerogel and the hybrid aerogel thereof in the shapes of sheets, fibers, particles and the like can be prepared. The preparation method is low in cost and is environmentally friendly, and the prepared aerogel is provided with a uniform nano-grade net porous structure.

The invention provides geopolymeric compositions intended for use in carbon dioxide injection or production wells or storage reservoirs and preferably in a supercritical carbon dioxide conditions. The geopolymeric composition is formed from a suspension comprising an aluminosilicate source, a metal silicate, an alkali activator, a retarder and/or an accelerator and a carrier fluid wherein the oxide molar ratio M₂O/SiO₂ is greater than 0.20 with M an alkali metal.

The present disclosure provides an integrated power generating system and method that combines combustion power generation with solar heating. Specifically, a closed cycle combustion system utilizing a carbon dioxide working fluid can be increased in efficiency by passing at least a portion of a carbon dioxide working fluid through a solar heater prior to passage through a combustor.

The invention discloses a coal-based supercritical carbon dioxide Brayton cycle double-split-flow efficient power generation system which comprises a low-temperature regenerator, a precooler, a main compressor, a re-compressor, a high-temperature regenerator, a boiler, a high-pressure turbine, a low-pressure turbine and an electric generator. The boiler is composed of a combustion channel, a main heat exchange channel and a tail flue in the smoke flowing direction, wherein the combustion channel, the main heat exchange channel and the tail flue are communicated in sequence; a water-cooled wall and a reheating water-cooled wall are sequentially arranged in the combustion channel in the smoke flowing direction; a high-temperature superheater and a high-temperature reheater are sequentially arranged in the main heat exchange channel in the smoke flowing direction; a baffle, a coal economizer and a low-temperature coal economizer are sequentially arranged in the tail flue in the smoke flowing direction, and a low-temperature reheater and a lower-temperature superheater are arranged on the two sides of the baffle. According to the coal-based supercritical carbon dioxide Brayton cycle double-split-flow efficient power generation system, optimal combining of the coal-fired boiler and the supercritical carbon dioxide Brayton cycle can be achieved, and the heat exchange efficiency of the high-temperature regenerator, the thermal efficiency of the boiler and the efficiency of the power generation system are high.

The invention discloses a 3D printing device and a 3D printing method by utilizing supercritical carbon dioxide as a solvent. The device mainly comprises a stock unit, an ejection unit, a three-dimensional molding platform unit and a raw material recycling unit, wherein the ejection unit comprises a gas pump, a needle valve, a cooling fan and a resistive heater; the stock unit comprises high polymer material powder, a powder pump, a carbon dioxide gas cylinder, a mixing tank, a liquefied booster pump, a heater, a liquid pump and a gas pump; the three-dimensional molding platform unit comprises an aluminum alloy molding platform and a three-dimensional ball screw sliding table module; and the raw material recycling unit comprises a closed box and a recovered gas pump. According to the method disclosed by the invention, the carbon dioxide gas is turned to be in a supercritical carbon dioxide state, and after the carbon dioxide gas is completely dissolved to produce supercritical carbon dioxide solution containing a high polymer material, the solution is conveyed into the ejection unit by virtue of the liquid pump. The supercritical carbon dioxide serves as a consumable carrier, so that more kinds of high polymer materials are applied to the field of 3D printing, and the overall performances of 3D printing supplies are improved.

The disclosure pertains to amphiphilic block copolymers comprising an aliphatic polycarbonate chain coupled to a hydrophilic polymer. Such amphiphilic polymers may have the formula A-L-B, where A- is a polycarbonate or polyethercarbonate chain having from about 3 to about 500 repeating units, L is a linker moiety and —B is a hydrophilic oligomer having from about 4 to about 200 repeating units. Provided copolymers are useful as surfactants capable of emulsifying aqueous solutions and supercritical carbon dioxide. Provided copolymers also have utility as additives for use in enhanced oil recovery methods.

A method or extracting crude oil of coix seed by supercritical carbon dioxide extraction. It comprise:1) drying, the water content of coix seed is below 10úÑú”2) pulverizing, naturally lowering temperature, after testing, pulverizing into 10-60 meshes; 3) supercritical carbon dioxide extraction, in the extracting vessel, the temperature is 30í½60degree Cú¼ the pressure is 19í½24MPaú”in the separating column, the temperature is 30í½60degree Cú¼ the pressure is 6í½15Mpaú”in the resolving vessel, the temperature is 30í½60degree Cú¼ the pressure is2í½6Mpaú”the flow rate is 10í½5000L/Hrú”the extraction time is 1í½4h.

The invention discloses graphene aerogel and a preparation method thereof. The method comprises the following steps: (1) uniformly mixing graphene oxide dispersion liquid with an amine water-soluble compound to obtain graphene oxide mixed liquid, wherein the amine water-soluble compound is selected from one or more of diethylamine, ethidene diamine, propane diamine, butane diamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, allylamine polymer and N,N'-bis(2-aminoethyl)-1,3-propane diamine; (2) irradiating the graphene oxide mixed liquid by high-energy rays under the anaerobic condition to obtain amino-modified graphene aerogel; (3) performing freeze-drying or supercritical CO2 drying to obtain the graphene aerogel. The graphene aerogel adopts a porous and macroporous structure, is relatively uniform in structure, and can be used for adsorbing an organic solvent; moreover, the preparation method is simple and environment-friendly.

A photoresist cleaning composition for removing photoresist and ion implanted photoresist from semiconductor substrates. The cleaning composition contains supercritical CO2 (SCCO2) and alcohol for use in removing photoresist that is not ion-implanted. When the photoresist has been subjected to ion implantation, the cleaning composition additionally contains a fluorine ion source. Such cleaning composition overcomes the intrinsic deficiency of SCCO2 as a cleaning reagent, viz., the non-polar character of SCCO2 and its associated inability to solubilize species such as inorganic salts and polar organic compounds that are present in the photoresist and that must be removed from the semiconductor substrate for efficient cleaning. The cleaning composition enables damage-free, residue-free cleaning of substrates having photoresist or ion implanted photoresist thereon.

The present invention relates to a new extraction method for producing pure natural jasmine flower essential oil, and is characterized by that under the condition of room temp. it has no need of any solvent treatment process, only uses damp air to blow through layered jasmine flowers to carry over aromatic component sent forth by jasmine flowers, and uses a special adsorbent to trap said aromatic component, then uses supercritical CO2 fluid extraction process to recover essential oil from adsorbent.

A method of depositing a metal film on a substrate includes a supercritical preclean step, a supercritical desorb step, and a metal deposition step. Preferably, the preclean step includes maintaining supercritical carbon dioxide and a chelating agent in contact with the substrate in order to remove an oxide layer from a metal surface of the substrate. More preferably, the preclean step includes maintaining the supercritical carbon dioxide, the chelating agent, and an acid in contact with the substrate. Alternatively, the preclean step includes maintaining the supercritical carbon dioxide and an amine in contact with the oxide layer. The desorb step includes maintaining supercritical carbon dioxide in contact with the substrate in order to remove adsorbed material from the substrate. The metal deposition step then deposits the metal film on the substrate without exposing the substrate to an oxidizing material which oxidizes the metal surface of the precleaned substrate and without exposing the substrate to a nonvolatile adsorbing material which adsorbs to the substrate. An apparatus for depositing the metal film on a substrate includes a transfer module, a supercritical processing module, a vacuum module, and a metal deposition module. The supercritical processing module is coupled to the transfer module. The vacuum module couples the metal deposition module to the transfer module. In operation, the apparatus for depositing the metal film performs the supercritical preclean step, the supercritical desorb step, and the metal deposition step.

A film removal system for cleaning a substrate containing a micro-feature having a residue thereon. The film removal system includes a supercritical fluid processing system configured for treating the substrate witha supercritical carbon dioxide cleaning solution to remove the residue from the micro-feature, and for maintaining the supercritical carbon dioxide solution at a temperature between about 35° C. and about 80° C. during the treating. The film removal system further includes an ozone generator configured for providing an ozone processing environment for treating the substrate either prior to treating with the supercritical cleaning solution or concurrently therewith, and a controller configured for controlling the ozone generator and the supercritical fluid processing system.