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35results about How to "Reduce particle size" patented technology

Catalyst for synthesizing diethyl oxalate by CO gas-phase coupling of ethyl nitrite and preparation method thereof

The invention relates to a catalyst for synthesizing diethyl oxalate by CO gas-phase coupling of ethyl nitrite and a preparation method thereof. The catalyst comprises a carrier, an active component palladium and a metal auxiliary agent iron, wherein the carrier is commercial hollow columnar [alpha]-Al2O3, the content of the active component palladium accounts for 0.1-1.0 wt% of the weight of thecarrier, and the content of the metal auxiliary agent iron accounts for 0.1-1.0 wt% of the weight of the carrier. According to the preparation method, a commercial hollow columnar carrier is adopted,and vegetable tannin and/or anhydrous dextrose and/or polyvinylpyrrolidone are/is added, so that palladium metal nanoparticles in the catalyst are smaller, the dispersity is higher, and the palladiumloading capacity is lower. The catalytic activity of the catalyst is basically improved by more than two times, the cost of the catalyst is reduced by more than four times, the prepared catalyst carrier is suitable for filling of a fixed bed with high space velocity by taking industrialization as a reference, and more precious experience is provided for industrialization of diethyl oxalate production.
Owner:TIANJIN UNIV

Metal powder material preparation device and method

The invention provides a metal powder material preparation device and method. The device comprises a tank, a rotating motor and an annular water pipe; a melting furnace is arranged at the top of the tank, and circulating water is contained in the bottom of the tank; the rotating motor is fixedly connected to the inner wall of the tank, a rotating shaft is arranged on the rotating motor, the upperend of the rotating shaft is connected with a rotating table, a rotating barrel is fixedly arranged on the rotating table, and screen holes are distributed in the barrel wall of the rotating barrel; and a circle of drainage holes are formed in the lower edge of the annular water pipe, the annular water pipe communicates with the upper end of a circulating water pipe, the lower end of the circulating water pipe extends into circulating water, and a circulating booster pump is arranged in the middle of the circulating water pipe. The device has the beneficial effects that the screen holes are distributed in the barrel wall of the rotating barrel of the device, the screen holes can prevent liquid drops of metal liquid thrown out of the rotating barrel from being too large, and therefore the quality of metal solid powder materials is improved; and the annular water pipe can spray impact water flow downwards, and the impact water flow further crushes the metal liquid drops and enables the metal liquid drops to be rapidly cooled to form metal powder.
Owner:沙洋富栩新材料技术有限公司
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