8 results about "Cesium sulfate" patented technology

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of a benzofuran compound. In an inert gas environment, a 2-fluorotoluene compound as shown in a formula 1 and a methyl benzoate compound as shown in a formula 2 are mixed and reacted with an organic solvent methyl tert-butyl ether in the presence of bis (trimethylsilyl) amino cesium and cesium sulfate, and the benzofuran compound as shown in a formula 3 is synthesized under a heating condition. Wherein the methyl benzoate compound as shown in the formula 2 can also be replaced by 2-naphthoic acid methyl ester or 1-naphthoic acid methyl ester. The research develops a benzofuran synthesis strategy without transition metal catalysis. According to the method, on the basis of commercially available raw materials, the construction of a benzofuran skeleton is realized through a simple and efficient path. Due to the mild and green reaction characteristic, a route with practical value is provided for synthesis of active medicine molecules and key intermediates of the active medicine molecules.

The present disclosure broadly relates to a high temperature chemical process for the synthesis of cesium tungstate in the solid state and the preparation of aqueous solutions or deuterated solutions of cesium tungstate. More specifically, but not exclusively, the present disclosure relates to a high temperature chemical process in which tungsten oxide compounds such as tungsten oxides, or natural or synthetic concentrates such as wolframite or scheelite, tungsten industrial by-products or there mixture thereof, are mixed with cesium compounds such as cesium carbonate, or cesium sulfate, or cesium hydroxide or their mixtures thereof and the mixture is roasted in air or oxygen at high temperature inside a kiln. After cooling, the solid sintered mass containing cesium tungstate is leached or dissolved with water or heavy water for producing dense aqueous solutions or deuterated solutions of cesium tungstate.

The present application belongs to the technical field of catalysts, and particularly relates to a preparation method of a catalytic cracking reaction composite metal catalyst and application thereof in preparation of vinylidene chloride, the preparation method of the catalytic cracking reaction composite metal catalyst comprising the following steps: (1) mixing a chitosan solution with an acetic acid solution, adjusting pH to obtain a mixed solution, and then adding a zinc lactate solution into the mixed solution and mixing uniformly to obtain a zinc chelate solution; (2) mixing the zinc chelate solution, an aluminum-containing compound, a silicon-containing compound and a template agent to form a slurry, forming molecular sieve particles through spray granulation, crystallizing, washing and drying to obtain zinc-containing molecular sieve microspheres; (3) mixing cesium sulfate, oleic acid and octadecene to obtain a cesium oleate solution through a mixing reaction; and (4) dispersing the zinc-containing molecular sieve microspheres into the cesium oleate solution to react, and obtaining the catalytic cracking reaction composite metal catalyst. The present application optimizes process conditions in the preparation process, and forms a perfect catalytic system.

The invention discloses a palladium-carbon catalyst for meropenem and a preparation method thereof, and the preparation method comprises the following steps: step 1, preparing a carrier: adding activated carbon into an aluminum ammonium sulfate solution, and stirring uniformly at a set temperature; adjusting the pH value of the system to 9-9.5 by using ammonium bicarbonate, and continuously reacting for preset time; after the reaction is finished, filtering, drying an obtained filter cake, and calcining at high temperature in a nitrogen atmosphere to obtain a catalyst carrier; 2, mixing a palladium oxalate solution with a cesium sulfate solution, adding the catalyst carrier prepared in the step 1, and concentrating until the system is anhydrous; and introducing hydrogen under a high-temperature condition for reduction to obtain the palladium-carbon catalyst. The palladium-carbon catalyst can maintain the specific surface area of the activated carbon and increase the density of the activated carbon, is easier to precipitate compared with pure activated carbon, and improves the filtering speed; the prepared palladium-carbon does not contain chloride ions, the activity of the palladium-carbon is improved, and meanwhile, cesium oxide is introduced into the palladium-carbon, so that the selectivity of the catalyst is improved.

The invention belongs to the field of organic synthesis, and particularly relates to a synthetic method of a benzyl phosphine compound. A methylbenzene compound shown in a formula 1 and a phosphine chloride compound shown in a formula 2 react in the presence of bis (trimethylsilyl) lithium amide, potassium tert-butoxide and cesium sulfate to synthesize a benzyl phosphine compound shown in a formula 3, and the benzyl phosphine compound is treated with a borane-tetrahydrofuran solution to obtain a benzyl phosphine-borane complex easy to separate and shown in a formula 4. Wherein the toluene compound as shown in the formula 1 can be replaced by 2-methylpyridine as shown in a formula 5, fluorene as shown in a formula 8, 9-methylanthracene as shown in a formula 11 or 1-methylnaphthalene as shown in a formula 14, and benzyl phosphine compounds as shown in a formula 6, a formula 9, a formula 12 or a formula 15 and benzyl phosphine-borane complexes as shown in a formula 7, a formula 10, a formula 13 or a formula 16 are synthesized respectively. According to the method, direct deprotonation of the toluene compound and nucleophilic substitution reaction of the toluene compound and the phosphonium chloride compound are realized by adopting the combined alkali, and the method has the advantages of easiness in reaction control, high economic benefit and the like.

The invention belongs to the field of organic synthesis, and particularly relates to a synthesis method of monobenzyl and dibenzyl phosphine compounds. The preparation method comprises the following steps: mixing toluene as shown in a formula 1 and a dialkyl phosphonium chloride compound as shown in a formula 2 with an organic solvent toluene in the presence of potassium tert-butoxide, bis (trimethylsilyl) lithium amide and cesium sulfate, and carrying out nucleophilic substitution reaction to synthesize the monobenzyl phosphine compound as shown in a formula 3, adding a borane-tetrahydrofuran solution to obtain a mono-benzyl phosphine-borane complex which is easy to separate and is shown as a formula 4; the preparation method comprises the following steps: mixing toluene as shown in a formula 1 and a dichlorophenyl phosphine compound as shown in a formula 2 with an organic solvent in the presence of potassium tert-butoxide, bis (trimethylsilyl) lithium amide and cesium sulfate, and carrying out nucleophilic substitution reaction to synthesize the dibenzyl phosphine compound as shown in a formula 6, and adding a borane-tetrahydrofuran solution to obtain the dibenzyl phosphine-borane complex which is easy to separate and is shown as a formula 7. According to the invention, a'one-pot method 'synthesis strategy is adopted, so that the separation of an unstable phosphine intermediate is avoided.

The application provides a method for preparing high-purity lithium hydroxide monohydrate and recycling rubidium and cesium, comprising the following steps: (1) mixing, ball-milling and roasting lithium ore, a sulfate and an additive at high temperature to obtain clinker; (2) crushing and grinding the clinker in step (1) and using water to obtain a leaching solution; (3) adding the leaching solution in step (2) into a three-chamber electrolytic cell for constant-current electrolysis to obtain an anode liquid, an intermediate liquid and a cathode liquid; (4) obtaining sulfuric acid from the anode liquid, evaporating and concentrating the intermediate liquid, step-by-step cooling and crystallization to obtain rubidium sulfate, cesium sulfate and sodium-potassium sulfate for roasting in step (1), and evaporating and concentrating the cathode liquid to obtain high-purity lithium hydroxide monohydrate. The high-purity lithium hydroxide monohydrate can be obtained through high selectivity of lithium ion solid-state electrolyte thin film to lithium, the utilization rate of potassium, rubidium and cesium is improved, the whole process is green and environmentally friendly, the comprehensive utilization rate of lithium ore is improved, and the product value is high.

The invention discloses a resource utilization method of potassium, aluminum, sulfur, rubidium and cesium, which can efficiently recover aluminum, potassium and rubidium sulfate resources and is used for producing lithium carbonate from lithium ores, and the method comprises the following steps: carrying out dehydration treatment and high-temperature roasting treatment on a byproduct alum to obtain a roasted material and acid gas; performing multi-stage absorption on the acid gas to prepare a first sulfuric acid solution and a second sulfuric acid solution; adding the roasted material into water, stirring and dissolving, and carrying out solid-liquid separation to obtain crude aluminum oxide and potassium sulfate enriched liquid; freezing and crystallizing the potassium sulfate enriched liquid, and separating out potassium sulfate crystals and crystallization mother liquor containing rubidium and cesium; mixing the crystallization mother liquor with the lithium precipitation mother liquor to obtain rubidium and cesium enriched liquor; extracting the rubidium-cesium enriched liquid to obtain a cesium-containing organic phase and a rubidium-containing water phase; the cesium-containing organic phase is subjected to reverse extraction, and a cesium sulfate solution and an inactivation extraction agent are obtained; extracting the rubidium-containing water phase to obtain a rubidium-containing organic phase and raffinate; and the rubidium-containing organic phase is subjected to reverse extraction, and a rubidium sulfate solution and an inactivation extraction agent are obtained.