97results about How to "Control reaction process" patented technology

A preparation method for an iron-based super conductor belongs to the technical field of iron-based super conducting materials. A1-xBxFe2As2 (A=Ba, Sr, Ca, Eu, and B=K, Na) and AFe2-xBxAs2 (A=Ba, Sr, Ca, Eu, and B=Co, Ni, Pd, Pt, Ir, Rh, Ru) are prepared, wherein 0<x<=0.7. For the A1-xBxFe2As2, FeAs is prepared first, then AFe2As2 and BFe2As2 are prepared respectively, and the FeAs, the AFe2As2 and the BFe2As2 are mixed and sintered to obtain the A1-xBxFe2As2. For AFe2-xBxAs2, FeAs and BAs are prepared first, then AFe2As2 and AB2As2 are prepared respectively, and the FeAs, the BAs, the AFe2As2 and the AB2As2 are mixed and sintered to obtain the AFe2-xBxAs2. A reacting process can be controlled by means of step reaction, generation of an impure phase is reduced, electromagnetic performanceof the iron-based super conductor is improved, and practicality is improved.

The invention provides a method for preparing trichlorosilane and dichlorosilane by hydrogenating silicon tetrachloride through microwave plasma, which aims to solve the problems of high energy consumption, low single-pass conversion rate and high equipment investment in the catalytic hydrogenation of the silicon tetrachloride by a Siemens method and problems of high energy consumption and material consumption and difficult industrialization in hydrogenating the silicon tetrachloride by a conventional thermal plasma method and a radio-frequency induction plasma method in the conventional polysilicon industry. The method comprises the following steps: forming a stable cold plasma through arced hydrogen, argon or a mixture of the two under excitation of microwaves; forming a plasma jet flowby a plasma torch under the condition of the flow of the arced gas; and ejecting feed gas into a specific area of the plasma jet flow to form an active particle consumption zone in which the silicon tetrachloride is hydrogenated into trichlorosilane. The single-pass conversion rate of the silicon tetrachloride of the method reaches about 60 percent; and the method has the advantages of simple subsequent treatment of a product, low requirement on equipment and operation control, and easy realization of industrialization.

The invention provides a preparation method of lithium difluorophosphate, wherein the preparation method comprises the following steps: 1) dissolving lithium hexafluorophosphate in an organic solventto obtain a first solution, and adjusting the temperature of the first solution to 20-30 DEG C; 2) dissolving lithium hydroxide in an organic solvent to obtain a second solution, and adjusting the temperature of the second solution to 15-30 DEG C; 3) dropwise adding the second solution to the first solution, and carrying out a reaction to obtain a reactant; 4) carrying out solid-liquid separationof the reactant to obtain a lithium difluorophosphate solution; and 5) filtering the lithium difluorophosphate solution, then crystallizing to obtain lithium difluorophosphate crystals, and drying toobtain the finished product. The preparation method has the advantages of high conversion rate of raw materials, fewer by-products, stable reaction and easy control, and can realize industrialized production.