Ammonium chloride production

Ammonium chloride is mainly used in dry batteries, ammonium salts, tanning, electroplating, precision casting, medicine, photography, electrodes, adhesives, yeast nutrients and dough improvers. Ammonium chloride, also known as halogen sand, is a kind of available nitrogen chemical fertilizer, which contains 24% ~ 25% nitrogen and belongs to physiological acid fertilizer. It is suitable for wheat, rice, corn, rape and other crops, especially for cotton and hemp crops to enhance fiber toughness and tensile strength and improve quality. However, due to the nature of ammonium chloride and if the application is not correct, it will often have some adverse effects on soil and crops.

Production method:
Recrystallization method: the crude ammonium chloride is added into the dissolver, dissolved by human steam, filtered, the filtrate is cooled and crystallized, centrifugally separated, dried, and the finished product of industrial ammonium chloride is prepared. The centrifuge separated mother liquor is returned to the dissolver for use;

After adding ammonium chloride mother liquor to 105 ℃, adding ammonium sulfate and salt to react at 117 ℃ to form ammonium chloride solution and crystallization of sodium sulfate, then remove sodium sulfate by filtration separation, and then add ammonium chloride solution to the reactor and then add ammonium sulfate and salt to form ammonium chloride solution and crystallization of sodium sulfate, then add ammonium sulfate and salt at 117 ℃. The saturated ammonium chloride solution was sent to the cooling crystallizer, and crystallized out at 32 ~ 35 ℃, filtered. The crystallization was eluted with four different concentrations of ammonium chloride solution. The Fe was < 0.008%, so _ 2 ~ (2 -) < 0.001%, and after washing to the standard, the crystal was eluted with four different concentrations of ammonium chloride solution. Then the crystal was re-adjusted into slurry with ammonium chloride solution, which was fed into centrifuge to separate and dehydrate, and then dried by hot air. Finished product of industrial ammonium chloride. The mother liquor is sent to the double decomposition reactor for recycling. The filtered and separated sodium sulfate is used to produce primary powder.

Gas-liquid phase synthesis: the hydrogen chloride gas is fed from the bottom of the turbulent absorption tower and contacted with the circulating mother liquor sprayed on the top of the tower to form a saturated ammonium chloride mother liquor flowing into the reactor to neutralize with ammonia gas. Form ammonium chloride saturated solution. The supersaturated ammonium chloride crystal was precipitated from the cooling crystallizer, which was cooled to 30 ℃ and 45 ℃. The upper ammonium chloride solution of the mold was sent to the air cooler for cooling and circulating to the mold, and the lower crystal slurry was thickened by the thickener and then separated by centrifugation to produce the final product of ammonium chloride.

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