10 results about "Disulfur dioxide" patented technology

The application belongs to the technical field of chondroitin sulfate preparation, and particularly relates to application and application method of liquid sulfur dioxide in preparation of chondroitin sulfate or chondroitin sulfate salt. In the application, liquid sulfur dioxide is used as a solvent to perform sulfonation modification treatment on unsulfated chondroitin, on the one hand, the use of traditional high-boiling organic reagents is avoided, the difficulty of three-waste treatment is reduced, and the process is more green and environmentally friendly; on the other hand, the post-treatment operation of the sulfonation reaction is simpler, and sulfur dioxide can be removed from the system by only temperature control or pressure adjustment, so that solvent residues possibly existing in the final product are avoided, and the product is safer. In addition, by adjusting the key conditions of the sulfonation reaction, the proportion of chondroitin sulfate with 6 independent sulfation in the disaccharide unit of the sulfonation product is 70% to 90%, the reaction is stable and reliable, and the sulfonation rate is high.

The invention relates to a method for manufacturing sulphuric acid, which involves converting sulphur dioxide SO2 into sulphur trioxide SO3, by injecting gaseous sulphur dioxide into a converter (1) inside which at least one mass (2) of a catalyst for the conversion is present, and according to which, during phases in which the injection of the gaseous sulphur dioxide is stopped, the space inside the converter (1) is heated in such a way as to maintain a minimum temperature of 200° C., and preferably 250° C., within each catalyst mass (2), characterized by the fact that the stopping of the injection of the sulphur dioxide is slaved to the starting of the heating, and vice versa.

The utility model belongs to the technical field of sulfuryl fluoride preparation equipment, and particularly relates to a reactor for preparing sulfuryl fluoride, which comprises a bottom frame, an outer barrel fixedly connected to the top of the bottom frame, a reaction barrel fixedly connected to the inside of the outer barrel, a bearing fixedly connected to the inner side of the reaction barrel, and a rotating frame fixedly connected to the inner side of the bearing. The rotating shaft drives the inner ring to rotate so as to drive the connecting rods to enable the outer ring to drive the spiral columns to rotate, the spiral columns are rotated by starting the motor, and the upper and lower adjacent spiral columns are arranged in a staggered manner, so that potassium fluoride particles attached to the outer sides of the spiral columns can be in full contact with sulfur dioxide and fluorine gas, and the reaction is more thorough; therefore, the preparation efficiency is improved.

The present application relates to a method for preparing sulfuryl fluoride, the method comprising: (1) providing a reaction stream comprising an organic base-hydrogen fluoride complex; (2) introducing sulfur dioxide and chlorine into the reaction stream comprising the organic base-hydrogen fluoride complex, and reacting to form a product stream comprising sulfuryl fluoride. The method described in the present application has mild reaction conditions, high product yield and purity, material recycling, less waste, etc., and is suitable for industrial production.

The application discloses a synthesis method of a beta-fluorosulfonyl sulfone compound and application thereof, and belongs to the technical field of chemical synthesis and medicinal chemistry. The method comprises the following steps: under a protective atmosphere, potassium trifluoroborate compound, a photocatalyst, a sulfur dioxide source, a hydrogen source and ethylenesulfonyl fluoride are mixed in an organic solvent, and reaction is carried out under light irradiation to obtain the beta-fluorosulfonyl sulfone compound. The application can realize preparation of a series of beta-fluorosulfonyl sulfone compounds, provides a new synthesis method for synthesis of the beta-fluorosulfonyl sulfone compound, and sulfone groups and sulfonyl fluoride groups are part of the structures of various drug molecules, so that the application is expected to be widely applied in the fields of organic synthesis, drug development and polymer materials.

The application provides a kind of construction of indole derivative fluorescent probe for detecting viscosity and sulfur dioxide in vivo, and belongs to the field of biological detection.The fluorescent probe (denoted as BIC) of the application utilizes the strong nucleophilicity of sulfur dioxide, and realizes the specificity selection of sulfur dioxide by generating new product BIC-SO2 through Michael addition reaction with double bond in the structure of probe; in addition, benzene ring and indole in BIC structure can freely rotate in low viscosity environment, resulting in non-radiation consumption of excited state energy, showing very weak fluorescence; in high viscosity solution, the free rotation of probe is inhibited, resulting in the recovery and enhancement of probe fluorescence, showing very strong fluorescence. Therefore, the fluorescent probe of the application can simultaneously detect viscosity and sulfur dioxide in vivo.

The invention discloses a method for efficiently preparing methanesulfonic acid from methane, which comprises the following reaction processes: introducing methane, sulfur dioxide and oxygen into a fixed bed reactor filled with a catalyst, and carrying out gas-liquid separation on reaction components to obtain methanesulfonic acid, the catalyst is a supported catalyst comprising an active metal and a carrier; the active metal comprises at least one noble metal selected from palladium, platinum and iridium and at least one other metal selected from vanadium, molybdenum, iron and potassium. The method has the advantages of simple process, high product yield, mild reaction conditions, easiness in industrialization and the like.

The present application relates to a kind of nickel cobalt hydroxide mass promotion method, the present application directly uses sulfur dioxide and air oxidation after removing iron aluminum, manganese in the liquid after removing iron aluminum, directly convert into manganese dioxide and other manganese oxides, remove manganese first, save the cost of continuous reducing agent;After removing manganese, the liquid is treated to form conversion alkali crystal slurry, itself contains little manganese, and the insoluble and non-reactive manganese oxide caused by excessive alkali problem will not be brought, so that the manganese content in nickel cobalt hydroxide product is reduced, and the quality of nickel cobalt hydroxide product is improved.

The application provides a method for preparing sulfinic acid compounds, sulfinic acid salt compounds, sulfonic acid salt compounds and sulfonyl compounds through sulfinylation, comprising the following steps: under the conditions of a protective atmosphere and light, performing a sulfinylation reaction on an alkyl compound and a sulfur dioxide donor under the condition of a catalyst to obtain an alkyl sulfinic acid compound. The main catalyst comprises a metal salt, and the metal elements in the metal salt comprise one or more of Fe, Cu and Ce; the cocatalyst comprises one or more of chlorosilane, a tetraalkylammonium chloride, an alkali metal chloride and hydrochloric acid. The method in the application has high catalytic efficiency (TON>350000, TOF>50000 / h), high selectivity (the conversion selectivity of sulfinic acid is >99%), high conversion rate (sulfinic acid is close to complete conversion), and is low in cost, high in atomic economy, basically free of waste in the production process, and green, low-carbon and environmentally friendly.

The invention is directed toward the production of 3-methylsulfolene using isoprene and can be used in the chemical and petrochemical industry. A process of producing 3-methylsulfolene using isoprene comprises reacting isoprene with sulfur dioxide in a cyclization reaction in the presence of an isoprene polymerization inhibitor and a tenfold excess of solvent relative to the amount of 3-methylsulfolene produced, at a temperature of 60-80°C and a pressure of 1.0 MPa for 1-2 hours, and subsequently purifying and drying the 3-methylsulfolene. The process is carried out in a plant for producing 3-methylsulfolene which consists of a batch reaction apparatus having an agitator and a heat exchange jacket, a fractionating column, pumps, feedstock tanks, final product tanks, intermediate tanks, a sulfur oxidation unit, a filter unit, and a unit of heat exchangers that are interconnected by a system of pipes with shutoff valves. The process of producing 3-methylsulfolene provides a high yield of high-purity target product, prevents large losses of solvent and enables more efficient use of sulfur, and can be used for industrial-scale production with the aid of the proposed plant, which provides for efficient production of 3-methylsulfolene.