Ammonium bicarbonate recrystallization production method

Abstract

The invention relates to an ammonium bicarbonate recrystallization production method, which comprises the following steps of (1) continuously extracting a part of ammonium bicarbonate suspension liquid synthesized in a carbonization tower to a centrifugal machine, and separating to obtain an ammonium bicarbonate product; (2) cycling the ammonium bicarbonate suspension liquid synthesized in the carbonization tower, continuously extracting a part of ammonium bicarbonate suspension liquid to a dissolving kettle 1, mixing with a centrifugal mother liquid in the step (1), and heating to 40 to 50 DEG C; (3) cycling the solution in the dissolving kettle 1, and cyclically extracting a part of solution to a dissolving kettle 2; (4) controlling the temperature of the solution in the dissolving kettle 2 to range from 60 to 70 DEG C, cycling, and continuously extracting a part of ammonium bicarbonate solution to the carbonization tower, and recrystallizing. The ammonium bicarbonate recrystallization production method provided by the invention has the following advantages that (1) no additive is needed to be added during production; (2) an ammonium bicarbonate product is good in granularity, free of being caked, and low in moisture content; (3) an carbonization recrystallization system can be used for continuously producing without the need for boiling the tower, so that the production continuity is maintained, and the ammonium bicarbonate yield is increased.

Description

technical field [0001] The invention belongs to the technical field of chemical production and relates to a production method for ammonium bicarbonate recrystallization. Background technique [0002] Ammonium bicarbonate (hereinafter referred to as ammonium bicarbonate) is a white compound in the form of granular, plate-like or columnar crystals with an ammonia odor. Ammonium bicarbonate is a kind of carbonate, so it must not be placed together with acid, because the acid will react with ammonium bicarbonate to form carbon dioxide, which will deteriorate ammonium bicarbonate. However, in rural areas, the property of ammonium bicarbonate to react with acid is also used. Ammonium bicarbonate is placed in a vegetable greenhouse, the greenhouse is sealed, and ammonium bicarbonate is placed in a high place, and dilute hydrochloric acid is added. At this time, ammonium bicarbonate will react with hydrochloric acid to produce ammonium chloride, water and carbon dioxide. Carbon di...

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Problems solved by technology

[0003] In the production of ammonium bicarbonate, the use of ammonia and CO 2 At a certain temperature, the gas reacts in the carbonization tower to generate ammonium bicarbonate, and the ammonium bicarbonate suspension generated at the bottom of the carbonization tower is continuously extracted to a centrifuge for centrifugation to produce ammonium bicarbonate, and the centrifuged mother liquor is returned to the carbonization tower. The use of ammonium bicarbonate has high requirements on product quality, so in general production, ammonium bicarbonate additives are added to make the ammonium bicarbonate particle size good, reduce moisture, and prevent ammonium bicarbonate from agglomerating. For this reason, 180 tons of additives are used every year, about 900,000 yuan, resulting in resource loss. Waste, and at the same time bring additive impurities to the product, affecting product quality

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