80results about How to "Meet the requirements of industrialized mass production" patented technology

The invention relates to a method for removing iron and silicon impurities during the regeneration of aluminum scraps, belonging to the field of impurity removal during the regeneration and recovery of non-ferrous metals. The method comprises the steps of putting 20-30% of borax, 20-30% of manganese chloride, 10-20% of calcium chloride, 10-20% of calcium oxide, 5-10% of magnesium carbonate, 5-10% of sulfur and 10-20% of filler into a stirring vessel, and mixing, so as to obtain iron removing flux; putting 30-50% of calcium sulfide, 20-40% of activated carbon, 5-10% of sulfur, 10-20% of calcium oxide and 10-20% of filler into a stirring vessel, and mixing, so as to obtain silicon removing flux; melting the aluminum scraps in a melting furnace, adding the iron removing flux into aluminum scrap molten liquid, stirring the aluminum scrap molten liquid, adding the silicon removing flux, stirring, and then, standing, so as to obtain aluminum scrap molten liquid; carrying out gas-blowing refining on the aluminum scrap molten liquid, and standing, thereby obtaining aluminum scrap melt in which iron and silicon impurity elements are removed. The method has the advantages that the yield of aluminum can not be affected, and the content of the iron and silicon impurity elements is lowered remarkably; the environment is not destroyed; the steps are simple.

The invention relates to a preparation method of 28-homobrassinolide, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: preparing a corresponding asymmetric epoxide from (2,22)-diene-24S-ethyl-5alpha-cholest-6-one under the action of a chiral catalyst and an oxidizing agent, and then carrying out esterification, oxidation and hydrolysisreactions to obtain a product. The catalyst provided by the invention has the advantages of high selectivity, high efficiency, and low dosage, and the method has advantages of low cost, simple process, convenient operation, environmental protection and good industrial application value.

The invention relates to a method for large-scale purification of plasmid DNA, and belongs to the technical field of bioengineering such as DNA vaccines, nucleic acid vaccines and gene therapy. The easy, convenient and rapid separation effect is achieved by adding diatomite into alkali lysate to aid filter and clarification, and then through purification steps such as concentrated ultrafiltration,molecular sieve chromatography, affinity chromatography, anionic exchange chromatography, replacement concentration of final products and degerming filtration of clarification lysate, plasmid DNA products meeting the medicinal standards can be produced. According to the method, the diatomite is used for the first time to aid filter and applied to the field of purification of the plasmid DNA products, and the operation method is simple, convenient and easy to enlarge; and the plasmid DNA purification method provided by the invention is high in operability and good in repeatability, the purified plasmid DNA is high in total recovery rate and meets the medicinal standards, and the requirements of mass industrial production can be met.