Efficient exhaust structure of reaction kettle for preparing sodium hypophosphite

Abstract

The invention discloses an efficient exhaust structure of a reaction kettle for preparing sodium hypophosphite. The efficient exhaust structure comprises a shell, an exhaust mechanism and a sealing mechanism; an inner barrel is fixedly arranged in the shell, a flange plate is arranged at an opening in the right side of the shell, mounting holes are evenly formed in the four corners of the flange plate, a round hole corresponding to a through hole in the middle of the inner barrel is formed in the middle of the flange plate, and air guide strips are evenly arranged on the inner arc wall of theinner barrel and are all spirally arranged. Supporting plates are evenly arranged on the inner side faces of the middles of the air guide strips, the inner side faces of the supporting plates are fixedly connected with the outer side face of a motor, and the left end of an output shaft of the motor is fixedly connected with a rotating shaft through a coupler. According to the efficient exhaust structure of the reaction kettle for preparing sodium hypophosphite, exhaust of gas in the reaction kettle can be accelerated, the exhaust efficiency of the reaction kettle is improved, butt joint installation between the structure and the reaction kettle is facilitated, meanwhile, the sealing effect can be achieved, and gas leakage is prevented.

Description

technical field [0001] The invention relates to the technical field of sodium hypophosphite preparation, in particular to a high-efficiency exhaust structure of a reaction kettle used for the preparation of sodium hypophosphite. Background technique [0002] Sodium hypophosphite is an inorganic compound, its chemical formula is NaH2PO2, it is a colorless pearly crystal or white powder, salty taste, easy to deliquescence, strong heating, decomposes to liberate phosphine and immediately catches fire in the air, and strong oxidant. Mixing will cause explosion, easily soluble in glycerol and hot ethanol, soluble in water, cold ethanol, slightly soluble in absolute ethanol, insoluble in ether, neutral in aqueous solution, obtained by neutralizing hypophosphorous acid with sodium carbonate, used as medicine , laboratory reagents and reducing agent in nickel plating, sodium hypophosphite is prepared by adding yellow phosphorus in inert gas with lime milk and sodium carbonate soluti...

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Problems solved by technology

[0002] Sodium hypophosphite is an inorganic compound, its chemical formula is NaH2PO2, it is colorless crystal or white powder with pearly luster, tastes salty, easy to deliquescence, strong heating, decomposes to release phosphine and immediately catches fire in the air, and strong oxidant Mixing will cause explosion, easily soluble in glycerin and hot ethanol, soluble in water and cold ethanol, slightly soluble in absolute ethanol, insoluble in ether, neutral aqueous solution, obtained by neutralizing hypophosphorous acid with sodium carbonate, used as medicine , laboratory reagent and reducing agent in nickel plating, sodium hypophosphite in the preparation of yellow phosphorus in an inert gas with lime milk and sodium carbonate solution into a high-speed emulsification reactor, while stirring, add a dispersant to make the ratio of phosphorus The surface area is greatly increased, so the reaction speed is accelerated. The mixture in the reactor is heated to 45-90°C to react, and phosphine and hydrogen are released. Calcium hydroxide dissolved in it, filtered to remove calcium carbonate, adding arsenic-removing agent and heavy metal-removing agent to the filtrate to purify the solution, filtering to remove impurities such as arsenic and heavy metals, and the filtrate was concentrated by vacuum evaporation, crystallized by cooling, and centrifuged to separate the mother liquor. The finished product of edible sodium hypophosphite is obtained. The exhaust efficiency of the traditional sodium hypophosphite preparation reactor is not high enough, it is not convenient for the docking installation between the exhaust structure and the reactor, the sealing effect is poor, and the gas is easy to leak. Therefore, a new method is proposed. Efficient exhaust structure of reactor used for sodium hypophosphite preparation is imperative

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