44results about How to "Process selection is reasonable" patented technology

The invention relates to a method for straightening a tank plate containing nickel and vanadium, which determines and controls recording temperature and roll bending manner and performances thrice straightening operations based on actual nominal thickness and nominal width of the steel plate and corresponding to the recording thickness input into the straightening model. The method of the invention has advantages of reasonable technique selection, scientific parameter determination and accuracy control method, the yield of the tank plate containing nickel and vanadium are raised from 80% to 97%, the integral time of delivery advances more than 10 days. Synthesis yield of the hot-rolled tank plate containing nickel and vanadium is enhanced, the re-straightening rate of the plate is reduced; but also the waste loss caused by disqualification of the plate is sufficiently decreased, and the economic benefit can reach 1.5 million yuan every year.

The invention discloses a comprehensive extraction method of ferro-silico-aluminum in gangue, comprising the following steps of: using gangue as a raw material, crushing, grinding, activating, carrying out acid leaching, filtering, neutralizing free acid in the acid leaching filtered solution by the use of active slag, filtering to obtain a neutralized acid leaching solution, adding a sodium carbonate solution into the neutralized acid leaching solution, adjusting pH value, separating iron and aluminium to obtain hydrous iron oxide, aluminium hydroxide and a by-product sodium sulphate, adding sodium sulphate and coke into the acid leaching slag which has undergone acid leaching and filtration, carrying out a high-temperature melt reaction to recover silicon so as to prepare soluble glass, simultaneously recovering sulfur dioxide to prepare sulfuric acid, reusing sulfuric acid for the acid leaching treatment, diluting the soluble glass by the use of a sodium carbonate solution, carrying out carborization to obtain white carbon black, and reusing the carbonating solution for iron-aluminium separation. The method provided by the invention has characteristics of wide application range of the raw material gangue, high comprehensive recovery rate, no output of by-products, less residue amount and the like, provides a novel technological process for high-efficiency recovery of ferro-silico-aluminum from gangue, and expands the ways of gangue application.

The invention explores a method for synthesizing and refining cinacalcet hydrochlorid, especially avoids toxic and expensive reaction reagents reported in literatures; the invention has the advantages of convenient sources of raw materials and reagents, low cost, little pollution to environment and simple operation, the invention is suitable for industrial production.

The invention provides a method for synthesizing 3-bromo-7-hydroxyquinoline. The synthesis method of 3-bromo-7-hydroxyquinoline of the present invention comprises the following steps: 1) dissolving 7-hydroxyquinoline in a solvent, adding trifluoromethanesulfonic anhydride, and reacting at low temperature to obtain quinoline-7-trifluoroquinoline mesylate, wherein the molar ratio of the 7-hydroxyquinoline to the trifluoromethanesulfonic anhydride is 1:(1~1.5); 2) the quinoline-7-trifluoroform obtained in step 1) The sulfonate is dissolved in a solvent, and N-bromosuccinimide is added to obtain 3-bromoquinoline-7-trifluoromethanesulfonate after the reaction; 3) the 3-bromoquinoline-7-trifluoromethanesulfonate obtained in step 2) Hydrolysis of the 7-triflate under basic conditions affords 3-bromo-7-hydroxyquinoline. The synthesis method of 3-bromo-7-hydroxyquinoline of the present invention has stable raw materials, non-toxicity, simple synthesis process and high yield.

The present invention relates to a method for synthesizing 1-R-4-amino-1, 2, 3, 4-tetrahydroquinoline, which mainly solves the technical problems that the prior synthesis method is difficult to amplify, long in route, inconvenient in reaction operation, and the like. The invention adopts a technical proposal that the method for synthesizing 1-R-4-amino-1, 2, 3, 4-tetrahydroquinoline is characterized by comprising the following steps: a. 4-hydroxyquinoline is taken as a raw material and reacts with alkyl halogenated matter or benzyl halogenated matter in solvent to form ketene; b. the ketene dissolves in the solvent, and a reducing agent is added to the solvent so as to obtain corresponding alcohol; c. corresponding alcohol of anhydrous tetrahydrofuran dissolved in the solvent is added to diphenoxyphosphinyl azide so as to be transformed into corresponding azide; and d. the obtained azide is dissolved in the solvent, and the 1-R-4-amino-1, 2, 3, 4-tetrahydroquinoline is obtained by a hydrogenation or adding triphenyl phosphine chemical reduction method.

This invention relates to a method for preparing 2-amino-8-nonenoic acid, especially optically active 2-amino-8-nonenoic acid. The method overcomes the problems of long synthesis route, low yield and expensive chiral catalyst or resolution reagent faced by the present method. The method comprises: attacking chiral pyroglutamate containing protecting groups with Grignard reagent of crotyl bromide to obtain chiral 2-amino-5-oxy-8- nonanoate, reducing to remove carbonyl and obtain chiral or racemized 2-amino-8-nonanoate, and hydrolyzing to obtain optically active 2-amino-8-nonenoic acid. The method in this invention has such advantages as simple route, reasonable process, and high yield, and is suitable for mass production.