4 results about "Tetrabromoethane" patented technology

The invention discloses a separation and purification device for tetrabromoethane production, and relates to the technical field of tetrabromoethane production equipment.The separation and purification device comprises a distillation mechanism, a separation mechanism, a condensation mechanism and a collection mechanism, the separation mechanism comprises a separation box, a movable sliding seat, a movable sliding frame and an activated carbon plate, and an air inlet groove communicated with an exhaust port is formed in the bottom of the separation box; a first sliding groove is formed in the inner side of the separation box, the movable sliding base is connected with the first sliding groove in a sliding fit mode, the bottom of the movable sliding frame abuts against the top of the air inlet groove, the side portion of the movable sliding frame is fixedly connected with the movable sliding base, and the activated carbon plate is arranged in the movable sliding frame. And the steam uniformly passes through each area of the activated carbon plate. Therefore, the activated carbon can give full play to the adsorption performance, pigments, peculiar smell and various impurity gases in the steam are continuously and efficiently removed, and the separation and purification degree of the tetrabromoethane steam is greatly improved, so that the high stability of the product quality is ensured.

The invention discloses a low-chlorine low-alkene tetrabromoethane synthesis method in the technical field of chemical synthesis, which comprises the following steps: synthesizing tetrabromoethane in a gas-liquid microporous continuous reactor by using a mixed gas of acetylene and nitrogen and bromine; a rotatable membrane assembly is arranged in a gas-liquid mixing through cavity of the gas-liquid microporous continuous reactor, the membrane assembly comprises a microporous membrane, a bromine inlet is connected with the gas-liquid mixing through cavity, a mixed gas inlet is connected with an inner side cavity of the microporous membrane, the gas-liquid mixing through cavity is connected to a tetrabromoethane collecting through cavity through a plurality of micropipes, and the tetrabromoethane collecting through cavity is connected with a gas inlet of the gas-liquid microporous continuous reactor. The reaction liquid leaves the device through a reaction liquid outlet, and the high-purity tetrabromoethane is obtained through alkali washing, water washing and adsorption of the reaction liquid after the reaction. Acetylene passes through membrane holes in the form of microbubbles, and forms a thickness lt with bromine on the surface of the membrane; a 10 [mu] m transient liquid film reaction zone; further addition reaction is completed in the microtube. The content of inorganic chloride, organic chloride and halogenated olefin in the finished product is low, and the quality of the product can be improved.

This invention discloses a method for preparing cis-1,2-dibromoethylene based on steric hindrance, belonging to the field of technical organic synthesis. The method includes the following steps: (a) providing reactors A and B connected in series. Bromine is added to reactor A, and a solvent and configuration-selective catalyst are added to reactor B. This invention employs a series reactor system. Under the synergistic effect of a copper / crown ether composite catalyst and ultraviolet light, a highly selective addition reaction of acetylene with bromine is achieved by controlling the solvent system, reaction temperature, and material ratio. Using acetonitrile or perfluoroalkane as solvent, and copper chloride and crown ethers (such as 15-crown-5) as catalysts, the reaction is carried out at 30-80℃ under 200-400nm ultraviolet light. The selectivity of cis-1,2-dibromoethylene is ≥95%, which has advantages such as mild reaction conditions, solvent recyclability, and suitability for industrial production. Furthermore, the cis selectivity is improved to ≥95%; the content of the byproduct tetrabromoethane is <0.5%; and the solvent recovery rate is >98%.

The utility model discloses a tetrabromoethane production device, and relates to the technical field of tetrabromoethane production. A packing layer is arranged in an absorption tower, an acetylene gas inlet is arranged at the lower part of the absorption tower, and a bromine inlet is arranged at the upper part of the absorption tower; the absorption tower is provided with a tetrabromoethane crude product outlet at the upper part of the acetylene gas inlet, and the gas phase outlet at the top of the absorption tower is connected with a first condenser through a pipeline. Acetylene gas will be broken into tiny bubbles when passing through the packing layer, which increases the gas-liquid contact area, enhances the absorption effect, and improves the yield of the product. At the same time, the bottom air intake increases the synthesis pressure of the absorption tower, which is conducive to accelerating the reaction and improving the reaction efficiency. At the same time, the raw materials react thoroughly, and it is not easy to form explosive gas at the top of the absorption tower, and the safety factor is higher. At the same time, the first condenser can greatly reduce the possibility of bromine overflowing into the air, avoid damage to the environment, and also reduce the waste of raw materials.