3 results about "Acetylpyruvic acid" patented technology

The invention discloses a bimetallic modified phosphorus-containing molecular sieve catalyst and a preparation method and application thereof.The preparation method of the bimetallic modified phosphorus-containing molecular sieve catalyst comprises the following steps that S1, an activated molecular sieve and a Mo compound are added into deionized water, heating and open overnight stirring are conducted, and solid powder A is obtained, solid powder B is obtained by calcining the molecular sieve in an air atmosphere at 550 DEG C for 2 hours, the molecular sieve is one of TS-1, SBA-15, gamma-Al2O3, HZSM-5 and PZSM-5, and the Mo compound is one of sodium molybdate, ammonium dimolybdate and molybdenum acetylacetonate; and S2, adding the solid powder B and a metal compound into deionized water, heating, opening and overnight stirring to obtain solid powder C, and calcining in an air atmosphere of 400-800 DEG C for 1-5 hours to obtain solid powder D which is the bimetallic modified phosphorus-containing molecular sieve catalyst, the metal compound is selected from one of iridium acetylacetonate, nickel acetylacetonate, ruthenium trichloride, ruthenium acetylacetonate, cobalt nitrate, platinum tetrachloride and dinitroso diammineplatinum. When the bimetallic modified phosphorus-containing molecular sieve catalyst is used for preparing 1, 2-epoxyhexane from 1-hexene, the bimetallic modified phosphorus-containing molecular sieve catalyst has high 1, 2-epoxyhexane selectivity, and can be used for efficiently preparing 1, 2-epoxyhexane from 1-hexene.

The invention discloses a comprehensive recovery method for low-grade stockpiled copper-sulfur ores, which comprises the following steps: firstly, crushing and grinding ores to achieve monomer dissociation among the ores, and adding a small amount of lime and sodium sulfide into a mill to adjust the pH value to 8-9; ethyl acetylacetonate or diethyl acetonedicarboxylate is matched with ethionine ester to serve as a chalcopyrite selective collecting agent, and copper concentrate is obtained after one-time roughing, two-time scavenging, two-time refining and two-time refining scavenging sorting operation; xanthate and sulfuric acid are added into copper separation tailings for activation, a concentrate product obtained after first-stage roughing and copper separation tailings obtained after two times of fine scavenging are combined, sulfur concentrate is obtained after two times of fine selection, and tailings are obtained after roughing tailings are subjected to two times of fine selection and two times of scavenging. According to the method, the chalcopyrite high-selectivity combined collecting agent is adopted, the flotation process is combined, under the condition that the using amount of an inhibitor is small, efficient recycling of the type of copper resources is effectively achieved, huge environmental protection pressure brought by low-grade stockpiling copper-iron sulfide ore to enterprises is effectively relieved, and meanwhile remarkable economic benefits are brought.

This application relates to a method for preparing carbamate compounds from dioxazolone derivatives, comprising the following steps: reacting a dioxazolone derivative with a hydroxyl-containing compound in the presence of a catalyst to prepare the carbamate compound. The catalyst includes one or more of dichlorobis(4-methylisopropylphenyl)ruthenium(II), tri(acetylacetonate)ruthenium(III), cyclooctadiene ruthenium(II) chloride, and dichloro(pentamethylcyclopentadienyl)iridium(III) dimers. This synthetic method is universally applicable to the synthesis of carbamate compounds with different group types (such as alkyl, aryl, heteroaryl, etc.), and exhibits high yields and mild reaction conditions.