6results about How to "Full reduction reaction" patented technology

The invention relates to a hot zone gas treatment unit of a solid oxide fuel cell. A mixer is transversely arranged in a combustion pipe, a combustion cavity is formed in the lower end of the mixer, an anode waste gas conveying pipe and a cathode waste gas conveying pipe are arranged at the upper end of the mixer, the anode waste gas conveying pipe and the cathode waste gas conveying pipe are connected into the galvanic pile, and the lower ends of the anode waste gas conveying pipe and the cathode waste gas conveying pipe are communicated with the combustion cavity. The preheating pipe and the heat exchanger are sleeved on the combustion pipe, a deionized water conveying pipe, a fuel conveying pipe and a mixed gas conveying pipe are arranged outside the preheating pipe, the mixed gas conveying pipe is communicated with the reformer, a reforming conveying pipe at the lower end of the reformer penetrates through the heat exchanger and is connected into the electric pile, and an air pipe penetrates through the heat exchanger and is connected into the electric pile. Waste gas conveyed by the anode waste gas conveying pipe and the cathode waste gas conveying pipe is combusted in the combustion cavity to generate heat, preheated fuel and deionized water are vaporized, the mixed fuel and vaporized deionized water enter the reformer, then are heated by the heat exchanger and enter the electric pile, and heat recycling is achieved.

The utility model relates to the technical field of catalyst preparation equipment, in particular to a reaction kettle for efficiently preparing a platinum-carbon catalyst. The utility model provides a reaction kettle for efficiently preparing a platinum-carbon catalyst. The reaction kettle comprises a cart, a reaction kettle body, a controller, a pump machine, a liquid conveying pipe, a gas conveying pipe, a connecting pipe and the like, a reaction kettle body is fixedly connected to the top of a top plate of the cart, a first cavity and a second cavity are formed in the reaction kettle body, a controller is fixedly connected to the bottom of the top plate of the cart, a pump is fixedly connected to the upper portion of the front side of the reaction kettle body, one end of a liquid conveying pipe is communicated with the inner bottom of the first cavity, the other end of the liquid conveying pipe penetrates through the pump and is communicated with a connecting pipe, and a gas conveying pipe is communicated with the connecting pipe. According to the utility model, by arranging the ultrasonic vibration rod and the stirring mechanism, ultrasonic dispersion and mechanical stirring of raw materials are realized, uniformly dispersed turbid liquid is obtained, the reduction reaction can be fully carried out, platinum particles can be more uniformly loaded on a carbon carrier, and thus the performance of the prepared platinum-carbon catalyst is improved.

The present invention discloses quartz pellets for silicon alloy production, wherein the quartz pellets contain SiO₂>96%, Al₂O₃<0.8%, and Fe₂O₃<0.8% by weight. The quartz pellets are approximately spherical in shape. When used for silicon alloy production, the quartz pellets and the carbonaceous reducing agent fall freely from the material tube and enter the surface of the ore-fired furnace. The large balls are quartz pellets, and the small balls are carbonaceous reducing agent pellets. The large and small balls are tightly packed and evenly distributed. When the furnace temperature is below 1700°C, no deflagration or explosion will occur. The quartz pellets have the characteristics of high reducibility, high explosion resistance, high specific surface area, high porosity in the pellets, low reduction starting temperature, energy saving and environmental protection, etc. The reducing atmosphere is good, and a large amount of reducing gas will enter the internal pores of the pellets to carry out microcirculation reaction, without stab fire phenomenon, and high heat energy conduction efficiency.

The invention discloses ultra-coarse tungsten carbide and a preparation method thereof, and the preparation method comprises the following steps: providing ultra-coarse tungsten oxide particles with the water content of 3-5 wt%, the average particle size of the ultra-coarse tungsten oxide particles being 28-45 [mu] m; loading the ultra-coarse tungsten oxide particles into a boat, placing the boat in a closed reduction furnace, introducing hydrogen, and carrying out a reduction reaction to obtain ultra-coarse tungsten particles; wherein the temperature of the reduction reaction ranges from 950 DEG C to 1100 DEG C, the boat loading amount ranges from 2.8 Kg / boat to 3.5 Kg / boat, the circulation time ranges from 45 min / boat to 60 min / boat, the hydrogen flow ranges from 8 m < 3 > / h to 15 m < 3 > / h, and the hydrogen dew point ranges from-65 DEG C to-75 DEG C; the ultra-coarse tungsten particles and carbon are mixed, and a carbon mixed material is obtained; performing high-temperature carbonization on the carbon-containing mixture to obtain tungsten carbide particles; the tungsten carbide particles are crushed and sieved, the ultra-coarse tungsten carbide is obtained, and the average particle size of the ultra-coarse tungsten carbide ranges from 30 micrometers to 60 micrometers. According to the method, the ultra-coarse tungsten particles with high purity and more uniform particle size distribution can be obtained.

The application discloses a preparation method of 3-chloro-5-fluoro-2-methylbenzoic acid, relates to the technical field of 3-chloro-5-fluoro-2-methylbenzoic acid production, and the method is characterized in that: 2-methyl-5-nitrobenzoic acid is used as a starting raw material, selective chlorination is carried out on the starting raw material in preheated high-temperature concentrated sulfuric acid and dichloro hydantoin, then esterification is completed by a one-pot method, catalytic hydrogenation reduction is carried out under low-pressure and low-temperature conditions by the synergistic action of a Raney nickel catalyst and a platinum-carbon catalyst, a high-purity amino intermediate is obtained, smooth thermal decomposition fluorination is carried out in a diglycol dimethyl ether solvent, alkaline hydrolysis and refinement are carried out, and finally the end product is obtained; the product has high purity and high yield.

The invention relates to the technical field of waste silica gel recycling, in particular to a method for preparing industrial silicon from waste silica gel and application of the method. The method provided by the invention comprises the following steps: step 1, adding collected waste silica gel into an alcoholic solution of a carburant for reaction, and then filtering; and 2, drying and removing impurities from the filter residues obtained in the step 1, heating the obtained filter residues to a melting temperature under closed and negative pressure conditions, carrying out a reaction, and cooling to obtain the product. According to the method, the added value of the waste silica gel is greatly improved, and the problems that in the existing waste silica gel treatment and industrial silicon preparation process, pollution is large, and the post-treatment procedure is complex are solved.