Method for extracting urotropine from oxadiazine wastewater

Abstract

The invention discloses a method for extracting urotropin from oxadiazine wastewater, which comprises the following steps of: adding oxadiazine wastewater into a single-opening pear-shaped bottle, heating, decompressing and dehydrating until a large amount of salt is separated out from water, stirring, cooling to 30 DEG C in a water bath, cooling to 10 DEG C by using ice water, carrying out suction filtration on the cooled material until the material is dry, and filtering to obtain the urotropin. Adding the prepared material into a single-opening pear-shaped bottle, continuously heating and dehydrating under reduced pressure until moisture is basically removed, adding methanol, keeping the temperature at about 60 DEG C, stirring for 1 hour, filtering out ammonium sulfate in a methanol solution while the solution is hot, dissolving urotropine in methanol, adding the urotropine methanol solution into the single-opening pear-shaped bottle, heating and dehydrating under reduced pressure to remove methanol, and filtering to obtain a urotropine-methanol solution; according to the technical scheme, ammonium sulfate in the oxadiazine wastewater is taken as a raw material to obtain viscous urotropine which cannot be subjected to suction filtration, 5%-20% of ammonia water is added into the viscous urotropine, stirring is performed for 30 min, and then a large amount of urotropine solid is separated out at the normal temperature, the problem that ammonium sulfate in the oxadiazine wastewater is difficult to separate from urotropine is solved, and the urotropine with very high purity is obtained.

Description

Technical field [0001] The invention involves the field of pesticide intermediate synthesis technology, which is a method for extracting Ulot products from evil diezine wastewater. Background technique [0002] Ulotopine, also known as Symnaphorethramine, is C6H12N4, which is an organic compound. [0003] Ulot, white humidity crystal powder or colorless and luster diamond crystals, combustible. The melting point is 263 ℃. If you exceed this melting point, sublimate and decompose, but do not melt. When the temperature is increased to 300 ° C, the hydrogen cyanide is released. When the temperature rises again, it is decomposed to methane, hydrogen and nitrogen. Relative density 1.331 (20 / 4 ℃). Flash point 50 ° C. Almost odorless, sweet and bitter. Soluble in water, methanol and chlorine. It is difficulty in carbon chloride, acetone, benzene, and ether, and insoluble in petroleum ether. [0004] Evilzide wastewater discharge not only pollutes the environment, but also causes waste o...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of solution that solves the problem that ammonium sulfate and urotropine are difficult to separate in the oxadiazine waste water, obtain the very high purity and get the urotropine extracting urotropine from the oxadiazine waste water. method, to solve the problems raised in the above-mentioned background technology

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