5 results about "Silver carbonate" patented technology

The application discloses submicron silver powder and a preparation method and application thereof, and belongs to the technical field of metal conductive powder.The preparation raw material of the submicron silver powder comprises an oxidizing agent, a reducing agent, a dispersing agent, a coating and settling agent and a twin crystal inhibitor; the oxidizing agent comprises at least one of silver nitrate, silver nitrite, silver carbonate and silver oxalate; the reducing agent comprises at least one of ascorbic acid, glucose, sodium borohydride, hydrazine hydrate and formaldehyde; the coating and settling agent comprises at least one of lauric acid, myristic acid, palmitic acid and stearic acid; and the twin crystal inhibitor comprises at least one of N,N-dimethylformamide, dimethyl sulfoxide, acetonitrile, hexamethylphosphorus triamide and dimethylacetamide; while effectively improving the dispersibility of the submicron silver powder, the twin crystal inhibitor restrains the growth of the eutectic face of the silver powder crystal, reduces the amount of the organic dispersing agent and improves the use performance of the silver powder at the slurry end.

The invention provides a novel carrier-free catalysis strategy, the in-situ carboxylation cyclization reaction of ultralow-concentration carbon dioxide and propargylamine is realized by utilizing low-cost silver carbonate under the conditions of normal temperature and normal pressure, and the oxazolidinone compound with important industrial value is efficiently synthesized. The catalytic system not only can efficiently convert carbon dioxide in a low concentration range of 5 vol.% to 35 vol.%, but also can directly convert carbon dioxide as low as 0.04 vol.% in air to generate oxazolidinone, the highest yield can reach 97%, and good substrate applicability is shown. By constructing a circular reaction device, the concentration of carbon dioxide in simulated gas can be reduced from 15 vol.% to 3 vol.%, and meanwhile, the average yield of oxazolidinone is maintained to reach 92%.

The application discloses a method for preparing pyrrolopyridine derivatives by reacting conjugated diene functionalized isonitrile and methine isonitrile, and belongs to the technical field of organic synthesis. The conjugated diene functionalized isonitrile and the methine isonitrile are used as reaction substrates, silver carbonate is used as a catalyst, and the reaction is carried out in an organic solvent to obtain 1H-pyrrolo[2,3-c]pyridine derivatives; the structural formula of the 1H-pyrrolo[2,3-c]pyridine derivatives is shown in the description. The application uses two types of isonitrile compounds, and the 1H-pyrrolo[2,3-c]pyridine derivatives can be prepared at normal temperature and pressure without isolating water or oxygen. The reaction condition is mild, the operation is simple, the raw materials and reagents are simple and easy to obtain, the practicability is high, and the method is suitable for synthesizing various 1H-pyrrolo[2,3-c]pyridine derivatives.

The present application relates to the field of medicine synthesis, and discloses a synthetic method of a sanguinarine intermediate compound bromide and application thereof. First, compared with the prior art, the synthetic method of the sanguinarine intermediate compound bromide can avoid using a difficult-to-prepare starting material, has short steps, mild reaction conditions, is easy to operate, has low cost, is environmentally friendly, has high yield and high product purity. Secondly, compared with the prior art, the sanguinarine hemisulfate synthesized by using the above bromide as a raw material can greatly reduce the amount of noble metal palladium catalyst, avoid using silver carbonate as an alkali (acid binding agent), and through conventional post-treatment operations such as extraction, beating and concentration, high-purity sanguinarine hemisulfate can be obtained without column chromatography separation.

The invention discloses a silver sulfate purification method and circulation system, and the purification method comprises the following steps: S1, adding silver carbonate into industrial silver sulfate slurry, carrying out gradient temperature control and stirring reaction until the pH value of the system is neutral, and obtaining deacidified slurry; s2, carrying out solid-liquid separation on the deacidified slurry to obtain a purified silver sulfate solid and a silver-containing mother solution; s2, the silver-containing mother liquor is subjected to electrolysis-carbonation treatment, regenerated silver carbonate is obtained, and the regenerated silver carbonate is reused in the step S1; according to the method, acid impurities are converted into silver sulfate in a targeted mode through silver carbonate, a silver resource closed-loop cycle is formed by coupling a mother liquor electrolysis-carbonation regeneration technology, silver carbonate is used as an acid removing agent, sulfuric acid is accurately removed and converted into silver sulfate in situ, a by-product CO2 is decomposed to drive reaction kinetics, and silver sulfate is obtained. Acid impurities in industrial silver sulfate are efficiently removed, closed-loop recovery of silver resources is achieved, and the production cost and environmental pollution are reduced.