4results about How to "Loose requirements" patented technology

This invention belongs to the field of nuclear magnetic resonance technology and discloses a compact superconducting coil heat transfer structure and a liquid helium-free superconducting magnet. The compact superconducting coil heat transfer structure, applied to a liquid helium-free superconducting magnet, includes a tubular superconducting coil winding frame. A flattened superconducting coil assembly is wound around the outer surface of the superconducting coil winding frame via grooves. A heat transfer plate is provided on the outer side of the superconducting coil winding frame, and an end-face heat-conducting plate is provided at each end of the superconducting coil winding frame. Each end of the heat transfer plate is connected to the corresponding end-face heat-conducting plate, and a heat transfer metal plate is connected to both end-face heat-conducting plates. The heat transfer metal plate is in contact with the superconducting coil assembly to form a closed heat transfer loop. This invention has a compact overall structure and, through the heat transfer plates, significantly reduces the risk of excitation quench, improving the ease of use and stability of the equipment.

The invention relates to a cyclic preparation method of a spirolactone key material, and belongs to the technical field of medicines. According to the method, resource utilization is carried out on a byproduct compound 2 generated in the production process of a spirolactone intermediate 1, and the byproduct compound 2 is converted into a spirolactone key material compound 1 under the acidic condition. The reaction is carried out in an organic solvent or an aqueous medium, the acidic aqueous solution is selected from hydrochloric acid, sulfuric acid, trifluoroacetic acid, acetic acid, nitric acid or phosphoric acid, the concentration range is 0.1-6 mol / L, the reaction temperature is 0-100 DEG C, the reaction time is 0.5-96 hours, and the feeding molar ratio of the compound 2 to the acid is 1: 0.5-1: 10. The organic solvent can be selected from ethers, alcohols, esters or haloalkanes. The obtained compound 1 can be used as a raw material for preparing spirolactone, and a final product is obtained through an oxygen bridge reaction, an esterification reaction, a decarboxylation reaction, an etherification reaction, a dehydrogenation reaction and a thioation reaction. The method provided by the invention realizes cyclic utilization of production byproducts, improves the utilization rate of raw materials, reduces the production cost, reduces waste discharge, and has a good industrial application prospect.

The application discloses a method for preparing vaterite calcium carbonate by submerged supergravity carbonization, which comprises the following steps: 1) taking ammonium salt with content of 95% or above, water, wet calcium carbide slag or ground and calcined dolomite for standby; 2) mixing the ammonium salt, water, wet calcium carbide slag or dolomite, heating and continuously stirring, and obtaining calcium-containing filtrate after filtration; 3) passing the calcium-containing filtrate obtained in the step 2) into a liquid submerged supergravity reactor, passing CO2 gas to perform carbonization reaction after the temperature of the material liquid in the supergravity reactor is stabilized, and collecting the calcium carbonate filter cake after filtration, washing and carbonization liquid; 4) mixing the filter cake, water and modifier, heating and beating to modify, and obtaining the vaterite calcium carbonate after filtration, washing and drying. The method does not need to use additional additives in the carbonization process, and the prepared vaterite calcium carbonate has a particle size of 2-5 um and can be stored stably for 30 days or above.

The invention discloses a preparation method of fullerene pyrrolidino quinazolinone, and belongs to the technical field of organic synthesis, namely the field of fullerene derivative synthesis, and the specific method is as follows: fullerene, a 2-aminobenzamide compound and an aldehyde compound are used as reaction substrates, lead acetate and DMAP are used as accelerators, o-dichlorobenzene is used as a solvent, and the fullerene pyrrolidino quinazolinone is prepared through a one-pot reaction. And carrying out one-step thermal reaction in the air to obtain the target product fullerene pyrrolidine quinazolinone. The method is simple in step, the obtained fullerene pyrrolidino quinazolinone derivatives are novel in structure, the variety of fullerene derivatives is greatly enriched, and meanwhile the fullerene pyrrolidino quinazolinone derivatives have good substrate universality and wide application prospects.