37results about How to "The reaction environment is stable" patented technology

The invention provides a method for continuously preparing a citalopram intermediate citalopram diol. The method comprises the following steps: preferentially mixing two Grignard reagents required bya reaction, mixing the mixed Grignard reagent with a raw material 5-cyanophthalide in a micro-mixer to obtain a reaction solution, completing the reaction of the reaction solution through a reactor toobtain a citalopram diol reaction solution, quenching, concentrating, extracting, acidifying, crystallizing, and carrying out other operations to obtain a qualified product. The citalopram diol provided by the invention is good in selectivity, high in yield, high in safety, safe, reliable, less in pollution discharge and suitable for industrial production.

The invention discloses a preparation method of titanium dioxide / hollow microsphere composite particles. In this method, a hydrophilic alkaline ionic liquid is used to replace the water+alkali system, so that the reaction has a more stable hydrolysis rate. Bead dispersion and surface titania adsorption film formation. The composite particle filler prepared by the above method has good titanium dioxide dispersion and film-forming properties, improves coating uniformity, and has obvious heat insulation effect.

The invention discloses a cooling system for a fuel cell of a hydrogen energy tram, which comprises a hydrogen fuel cell, a circulation device, a cooling device and an electric heating tube, wherein the hydrogen fuel cell, the circulation device and the cooling device are sequentially connected through pipelines, and A cooling circulation loop is formed; one end of the electric heating tube communicates with the circulation device through a pipeline, and the other end communicates with the hydrogen fuel cell through a pipeline to form a heating circulation loop. The invention can accurately and relatively stably control the temperature of the cooling liquid when it enters the hydrogen fuel cell within the optimum reaction temperature range, so that the hydrogen fuel cell is in a suitable reaction temperature environment and improves the reaction efficiency of the hydrogen fuel cell; and the invention has a simple structure , the effect is obvious and saves energy.

The invention discloses a recovery device for CVI / CVD process tail gas, which comprises cooling filter equipment, a vacuum pump, an isothermal cracking furnace and later comprehensive treatment equipment. The cooling filter equipment includes a circulating liquid cooling module, an oil filter and a dry filter; isothermal cracking A preheating zone module is placed at the bottom of the furnace, and an isothermal zone module is set above the preheating zone module. The preheating zone module is a multi-layer labyrinth graphite plate. The lower part of the isothermal zone module is the delay buffer zone, and the upper part of the isothermal zone module is the upper cavity of the isothermal zone. The upper cavity of the isothermal zone is equipped with a multi-layer graphite plate structure. The graphite plate is equipped with an activated carbon growth structure, and the surface of the activated carbon growth structure is loaded with carbon black catalyst. . The top of the isothermal cracking furnace is a gas outlet, and the gas outlet is connected to the later comprehensive processing equipment through pipelines. The post-comprehensive treatment equipment includes a pressure change separator and a solid filter. The invention is a recovery device and method of CVI / CVD process tail gas with high treatment efficiency, good safety performance and high eco-environmental friendliness.

The invention discloses a method for preparing nano-silicon carbide by using silicate-based glass as a raw material. A certain proportion is uniformly ball-milled and mixed, put into a container and reacted under an inert gas, and then the reaction product is pickled to obtain nano-silicon carbide. The steps of the invention are simple and easy, and the sources of raw materials are extensive. Adding molten salt containing Mg can be used as an endothermic agent to control the reaction temperature and increase the solubility and wettability of magnesium, so that the reaction can be more complete, and the reactants are not easy to agglomerate. The three-dimensional porous silicon carbide prepared by this method has high purity, uniform particles, and high specific surface area (180-260m 2 / g), rich mesoporous structure and other advantages, it has broad application prospects in radiation resistance, radioactivity resistance and wave absorption.

The embodiment of the present application discloses a method for removing impurities and treating waste positive electrode materials of lithium batteries during the recovery process. Including at a first temperature higher than room temperature and a fixed first pH value, controlling the flow rate of the lithium battery scrap positive electrode material leaching solution and the first alkaline solution to precipitate and remove iron ions, aluminum ions and at least part of the copper ions to obtain the first filtrate; Under the second temperature higher than room temperature and the fixed first pH range, control the flow velocity of the first filtrate, complexing agent and the second alkaline solution to separate the second filtrate containing lithium ions to obtain the precipitation of the target substance; carry out the precipitation of the target substance Dissolving to obtain a first solution; at a third temperature higher than room temperature and a fixed fluoride ion concentration, controlling the flow rate of the first solution and a fluorine-containing precipitant to precipitate and remove calcium ions, magnesium ions and at least part of lead ions to obtain a target solution. Through the method of the present application, a precipitate with large particle size, high crystallinity and low water content can be obtained, which is convenient for washing and improves the recovery rate of nickel-cobalt-manganese, the scrap positive electrode material of lithium batteries.