32results about How to "Low critical temperature" patented technology

The invention discloses green carbon dioxide supercritical fluid semiconductor cleaning equipment which is used for cleaning semiconductor silicon wafers without water. The equipment comprises a main working chamber for carrying out supercritical fluid cleaning and supercritical drying, a separating chamber for separating carbon dioxide and cleaning waste liquid, a temporary storing tank for storing a cleaning agent for enhancing the cleaning effect and a cosolvent, a carbon dioxide circulation control system for compressing, cooling and storing the carbon dioxide, and the like. all parts are connected by a pipeline with a valve. Under the cooperation of a small amount of organic solvent, the carbon dioxide without surface tension is taken as a cleaning medium and a rinsing solution to go deep into tiny holes to obtain good cleaning and drying effects. By utilizing the equipment, massive consumption of pure water and the pollution brought by chemical agents are avoided, and the problems of structure deformation, particle adsorption and the like caused by the surface tension in the traditional process are solved, and the cycle use of the carbon dioxide reduces the massive discharge of greenhouse gases.

The invention relates to a supercritical extracting and drying method in a process of preparing ultrahigh molecular weight polyethylene filber (UHMWPE), including: the fiber molded after cooled and solidified drops in an extraction kettle, and is arranged regularly; feeding extractant into the extraction kettle for supercritical extraction; after extraction complete, feeding hot gas in to dry; or drying in a vacuumizing mode; wherein the mentioned extractant is selected from one of methane, ethane, ethane, and propylene. The invention adopts supercritical extraction method to remove the first solution added in a solution preparing process, and the extracting and drying arts are completed in one device, simplifying the process.

The invention discloses sub-high temperature vulcanized solid sound-transmitting rubber and a preparation method thereof. The method comprises: plasticizing the sound-transmitting rubber in an open mill; blending the rubber; adding magnesium oxide and a tetramethylthiuram disulfide (TMTD) promoter in turn, then adding stearic acid, carbon black, talcpowder and an anti-aging agent A and finally adding zinc oxide and a promoter A; thinning the rubber and loading sheets and obtaining unvulcanized rubber sheets; and vulcanizing the rubber sheets at 90 to 100 DEG C and obtaining the solid sound-transmitting rubber. According to the invention, the promoter A which is thiourea is used to reduce the critical temperature of the vulcanization of the rubber; the TMTD promoter accelerates vulcanization, and the acidic characteristic of the promoter prolongs the scorching time of the rubber to prevent the rubber from scorching in a blending process; the vulcanization at a sub-high temperature of 90 to 100 DEG C is convenient with an infrared lamp as a heat source; and the sound-transmitting rubber is used on equipment susceptible to high temperature and large equipment and can be maintained on site.

The invention discloses a biomass liquefaction method in the presence of coupling action of subcritical/supercritical cyclohexane and molecular sieve. Subcritical/supercritical cyclohexane serves as a medium, and a molecular sieve catalyst containing zeolite ingredients serves as a catalyst. The biomass, the cyclohexane and the molecular sieve catalyst containing zeolite ingredients react at a temperature of 285-330 DEG C under pressure of 1.7-4.2 Mpa to prepare into biomass oils. High-efficiency conversion of the biomass can be realized by the coupling action of the cyclohexane solvent and the molecular sieve catalyst under the subcritical or supercritical condition. Compared with a method using a subcritical (or supercritical) solvent without adding a catalyst or a biomass catalytic conversion method under the non-subcritical (or non-supercritical) condition, the biomass liquefaction method provided by the invention is used to obviously improve the conversion rate of the biomass andthe quality of the converted products.

A preparation process of oridonin fine particles is characterized by comprising the following steps: (1) preparing oridonin solution; (2) connecting the oridonin solution prepared in the step (1) with a solution pump; (3) charging carbon dioxide; (4) jetting the oridonin solution into a crystallization reactor by a nozzle in a supercritical fluid anti-solvent equipment system through the solution pump; and (5) separating out the oridonin crystals. The oridonin fine particles prepared by the process are characterized in that the particles are loose amorphous white superfine powder; and the particle size d (0.5) is 5.135um. The process is suitable for the superfine oridonin powder, improves the medicine dissolution and the curative effects and is used for preparing the oridonin fine particles by applying the supercritical fluid crystallization technology.

The invention discloses a method for preparing an ester compound from subcritical/supercritical ethanol liquified straw cellulose. According to the method, the ester compound is prepared from the straw cellulose under the conditions that the temperature is 300 DEG C and the reaction time is 60-120 DEG C by taking ethanol as a medium, and the weight-to-volume ratio of the straw cellulose and the ethanol is 15:(120-200). The method disclosed by the invention can be used for preparing the ester compound by adopting subcritical/supercritical ethanol as a reaction medium and is lower in requirement on the property of an equipment material and high in transformation efficiency. The ester compound contained in obtained biological oil achieves the yield of 10.25%-19.25%.

The invention relates to amomum tsao-ko oil resin and a preparation method thereof. The amomum tsao-ko oil resin is prepared by adopting a method comprising the following steps: adding plant oil into amomum tsao-ko powder as an extraction auxiliary, stirring and uniformly mixing; adding the mixture of amomum tsao-ko powder and plant oil into an extraction kettle of a supercritical carbon dioxide fluid extraction device, closing a kettle cover, adjusting speed of carbon dioxide fluid to be 20-30g/min, pressure of the extraction kettle to be 30-35MPa and temperature to be 45-50 DEG C; adjusting pressure of a separation kettle to be 4-6MPa and temperature to be 40-45 DEG C; carrying out cyclic extraction and separation for 3-4 hours, colleting a product (namely amomum tsao-ko oil resin crude extract) discharged from the separation kettle; carrying out separation treatment by virtue of a 4000r/min settling centrifugal machine, and removing water and impurities at the bottom layer, thus obtaining the amomum tsao-ko oil resin product. The obtained amomum tsao-ko oil resin has strong fragrance and taste.

The invention discloses a method for preparing bio-oil enriched in aromatic compounds through a supercritical mixed organic solvent liquefied lignin. The method comprises the following steps: adding alkali lignin and a low-molecule organic solvent under supercritical conditions to a pressure-resistant container with a magnetic stirring device, reacting under the conditions of the temperature of 280-340 DEG C and the pressure of 8.8-16.0MPa for 0-120 minutes, cooling to room temperature, and collecting the product, thereby obtaining the bio-oil, wherein a ratio of the usage amount of the alkali lignin to the mixed solvent is (1-3g):(60-120mL). According to the method disclosed by the invention, the supercritical mixed low-molecule organic solvent and the like are taken as reaction media, the concentration and activity of hydroxyl and hydrogen group produced in a supercritical state can be greatly improved along with rise of the reaction temperature, and the hydroxyl and hydrogen group have obvious effects of promoting liquefied conversion from the lignin to the bio-oil. Moreover, the method is mild in reaction conditions, low in performance requirements of equipment materials, economic in price, high in application and popularization properties and high in yield of the aromatic compounds in the bio-oil.

The invention relates to the technical field of bonding resins, and concretely relates to a preparation method of a low-VOC bonding resin. The preparation method comprises the following steps: preparing a primary bonding resin from a matrix resin, a graft monomer, an initiator, a tackifying resin and a functional assistant through a double screw extruder, feeding the primary bonding resin into a supercritical device, and removing VOCs from the primary bonding resin by a purifying solvent to obtain the low-VOC bonding resin, wherein the purifying solvent is one or more of carbon dioxide, 1,1,1,2-tetrachloroethane, methane, ethane, propane, ethylene and propylene. The supercritical fluid purification of the primary bonding resin in the method greatly reduces the content of the VOCs in orderto effectively improve the use performance and the safety performance of an automobile plastic fuel tank; and the preparation method has the advantages of environmentally-friendly and efficient preparation process, and simple process route, and the tackifying resin and the functional assistant can improve the flowability, the adhesion and the aging resistance of the bonding resin.

The invention discloses a heat abstractor for a high-power vertical-axis wind generating set. In the heat abstractor, an air passage penetrates the flat clearance at the middle of an end cover, and at least one air feeder/exhaust fan is arranged in the air passage. In addition, a plurality of air holes are penetratively arranged on an armature of a stator, and a plurality of air holes are penetratively arranged on a permanent magnet of a rotor disk. The hear abstractor has good radiating effect, greatly reduces critical temperature inside a wind generator, effectively avoids local overheating, and is beneficial to development of the vertical-axis wind generator towards the trend of high power.

The invention discloses a new energy material and conversion equipment. The conversion equipment is characterized by comprising a material storage tank, a thermal power generator, a steam turbine, a heat exchanger and a cooler which are sequentially communicated through pipelines, wherein the cooler is communicated with the material storage tank, the connecting pipeline of the material storage tank and the thermal power generator is provided with a delivery pump, and the material storage tank is filled with the new energy material. The equipment is low in cost, good in energy conversion effect, easy to operate, efficient, capable of saving energy, safe and environmentally friendly. The new energy material is ammonia or an ammonia mixture which is low in boiling point, low in critical temperature and high in critical pressure, and the application range of materials is widened.

The present invention relates to a high-yield die casting alloy material suitable for use in a mobile phone medium plate and a preparation method of the high-yield die casting alloy material. The alloy comprises the following components of, 11.0 wt%-15.0 wt% of Si, 1.0 wt%-2.0 wt% of Mg, 0.1%-0.5% of Fe, 0.2 wt%-0.8 wt% of Mn, less than 0.5 wt% of Ce, 0.01 wt%-0.5 wt% of Zr, less than 0.15 wt% ofCu, less than 0.01 wt% of rest of impurities, and the balance of Al. compared to the prior art, the preparation method significantly improves the yield strength and elongation of the material by adding Mn, Si, Mg and Ce to the aluminum alloy and introducing three strengthening phases Mg2Si, MnAl6 and Al11Ce3 binary precipitated phase.

The invention relates to a formation method of a semiconductor structure. The method includes the following steps that: a semiconductor substrate is provided; a mask layer with an opening is formed on the surface of the semiconductor substrate, wherein the opening exposes a part of the surface of the semiconductor substrate; the semiconductor substrate is etched along the opening, so that first through holes can be formed in the semiconductor substrate; oxidation treatment is performed on the surfaces of the side surfaces of the first through holes, so that an oxide layer can be formed, the oxide layer is removed, so that second through holes are formed, the roughness of the side walls of the second through holes is made to be smaller than that of the side walls of the first through holes, or annealing treatment is performed on the side walls of the first through holes, so that second through holes can be formed, and the roughness of the side walls of the second holes is made to be smaller than that of the side walls of the first through holes. With the above method adopted, the roughness of the side walls of the second holes formed in the semiconductor substrate can be decreased.