45results about How to "Reduce chemical reaction time" patented technology

The invention relates to a fluorous synthesis method of betamethasone, belonging to the technical field of steride medicament synthesis methods in pharmaceutical chemistry. The method comprises the following process steps: fluorinating and refining betamethasone epoxide which is used as a raw material so as to obtain betamethasone. According to the invention, the fluorous synthesis method of betamethasone is reasonable in design, thus chemical reaction time is greatly reduced, production period is shortened, a whole technical level of a product is greatly improved, cost is reduced by 15% as compared with the conventional process, and the fluorous yield of betamethasone reaches 85-90%.

A chemical mechanical polishing (CMP) device for processing a wafer is provided which includes a plate for supporting the wafer to be processed in a face-up orientation, a polishing head opposing the plate, wherein the polishing head includes a rotatable polishing pad operable to contact the wafer while the polishing pad is rotating, and a slurry coating system providing a slurry to the polishing pad for polishing the wafer.

A nano rare-earth oxide is prepared from the inorganic salt of rare-earth element (Ce, La, Pr, Nd, or Tb) and ligand (oxalic acid, sodium oxalate, dicarbonate, 8-hydroxyquinoline, complexon, etc) through proportioning, mixing, and ball grinding while solid-phase chemical reaction to obtain precursor, removing impurities, drying, and medium-temp thermal decomposition. Its advantages are simple process, low cost, saving energy, high purity (more than 99%) and narrow size distribution (10-30 nm).

A camping multi-fuel heating stove, including a furnace body, the furnace body is provided with a movable fuel furnace, a number of air inlet holes are opened on the wall of the fuel furnace, and a vaporization device for evaporating and vaporizing the fuel is arranged in the fuel furnace. A coal-fired hearth that can move is set inside the fuel furnace; the lower part of the furnace body is provided with an ash outlet, the upper part of the furnace body is provided with a furnace panel, the furnace panel is provided with a chimney seat, and the side wall of the furnace body is provided with an additional coal mouth. When the fuel oil of the present invention is used, take out the coal-fired furnace and put it into the fuel-fired furnace and fire gathering cover; , Solid fuel, strong fuel adaptability, can ensure good combustion effect in areas with an altitude of 4500m, good adaptability to high altitude, high thermal efficiency, and strong service support capabilities. The invention is also applicable in plain areas, and has low manufacturing cost, low maintenance cost and stable and reliable performance.

The invention relates to a neutral blockage removing agent composition used for an oil recovery formation in an oilfield. The neutral blockage removing agent composition is prepared from the following raw materials in parts by weight: 10-14 parts of polyepoxysuccinic acid amine, 35-40 parts of diethylenetriaminepentaacetic acid amine, 33-37 parts of hydroxyl succinic acid amine, 20-25 parts of polyacrylamide, 7-10 parts of sodium polyaspartate, 10-14 parts of sodium gluconate, 10-15 parts of activated clay, 20-25 parts of potassium peroxodisulfate, 9-11 parts of hydroxyl butanedioic acid amine, 4-7 parts of sodium salicylate, 5-9 parts of hexamethylene tetramine, 0.2-0.3 part of vanadium pentoxide, 2-5 parts of starch, 5-8 parts of alpha-sulphonated fatty acid methyl ester and derivative thereof (MES) and 0.1-0.3 part ofdiethyl ethanolamine. The neutral blockage removing agent composition is used for the blockage removal of an oil pumping well and a screw pump well in the oilfield, can effectively solve the problems of cleaning blockage removal of the oil pumping well and the screw pump well in the oilfield and the corrosion of oil recovery equipment, has high blockage removing speed, is neutral and is free of corrosion; waste liquid for blockage removal can be degraded and does not need to be discharged onto the ground to be subjected to sewage treatment, no corrosion, dead angle, precipitation or secondary well blockage are generated, and more safety and more reliability are realized as compared with traditional pickling blockage removing, biological blockage removing and solvent blockage removing.

The invention discloses an antiwear antifriction composite powder for lubricating oil (grease) and a preparation method thereof and relates to a nano-rare earth oxide-cladding ultrafine muscovite composite powder for the fields of lubricating oil, lubricating grease and the like. the invention is characterized in that a muscovite powder, rare-earth salt and its ligand are used as raw materials; a solid-phase reaction system is crushed by shear force and impact force generated during the ball-milling process, specific surface area of reactants is increased, and reaction rate is raised so as to raise ratio of nucleation rate to growth rate; a fine and uniform precursor is prepared, and then washing, drying and control of thermal decomposition temperature and time are carried out so as to obtain the nano-rare earth oxide-cladding ultrafine muscovite composite powder with different particle sizes and cladding systems; and after undergoing surface modification, the nano-rare earth oxide-cladding ultrafine muscovite composite powder is added into base oil or lubricating grease at different proportions of (0.5%-3%). In four-ball friction, friction coefficient can be reduced, and friction-pair wear scar diameter is minimized.

The invention provides a preparation method of silicate phosphor with good stability. The method includes the steps that corresponding alkali metal salt, tetraethoxysilane and europium nitrate are weighed according to the stoichiometric ratio of all elements; a surface active agent and cosolvent accounting for 0.1-2 wt% the total mass of the above-mentioned medicine are then weighed; tetraethoxysilane is subjected to full hydrolysis, then the alkali metal salt, europium nitrate, the surface active agent and a chelating agent are mixed in a water solution, and the molar ratio of the reactant to the chelating agent is 1: (2-6); then the two solutions are mixed and then fully stirred till a transparent and clear solution is formed, the solution is aged and then dried at the room temperature, precursor powder is obtained, the precursor powder is uniformly mixed with the cosolvent, calcination is conducted for 3-6 hours under a reduction atmosphere, the calcination temperature is 1100-1400 DEG C, and the required phosphor is obtained. The phosphor prepared through the method is wide in excitation wavelength, high in light-emitting strength, good in crystallinity, narrow in size distribution and suitable for serving as phosphor for white-light LEDs.

A camping oil-fired heating stove, comprising a furnace body, the furnace body is provided with an oil-fired furnace, a number of air inlet holes are opened on the wall of the oil-fired furnace, a vaporization device for evaporating and vaporizing the fuel is arranged in the fuel-fired furnace, and the upper part of the fuel-fired furnace A fire gathering cover is provided; an air inlet is provided at the lower part of the furnace body, a conical heat radiation cylinder is provided on the top of the furnace body, and a chimney seat is provided on the top of the conical heat radiation cylinder. The present invention adopts a vaporization device to realize fuel vaporization-combustion self-sustaining and non-powered combustion. At the same time, relying on the suction of the chimney during combustion, the combustion-supporting air is sucked in from the bottom air inlet, and the furnace body and the conical heat radiation tube are under negative pressure, which effectively reduces indoor pollutant emissions. The invention does not require personnel to be on duty at night, and is a camping fuel oil heating stove with high combustion efficiency, safety and no pollution.