Process for jointly producing melamine, sodium carbonate and ammonium chloride by using urea
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A joint production and ammonium chloride technology, applied in the direction of alkali metal chloride, ammonium halide, products, etc., can solve the problems of low production efficiency, high cost and low conversion rate of reactants in a single pass, so as to improve work efficiency and improve Yield effect
Inactive Publication Date: 2016-06-08
QINGDAO SHOUTAI AGRI SCI & TECH CO LTD
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In the current process method for producing melamine, soda ash and ammonium chloride, the technological process is not easy to implement, the resulting melamine, soda ash and ammonium chloride have low purity, the single-pass conversion rate of reactants is low, and the production process is complicated. Low efficiency and high cost, not suitable for mass production
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[0015] The technique of utilizing urea to jointly produce melamine, soda ash and ammonium chloride of the present embodiment may further comprise the steps:
[0016] (1) Production of melamine with urea as raw material;
[0017] (2) passing the mixed gas of ammonia and carbon dioxide obtained by producing melamine in step (1) into a certain amount of sodium chloride (NaCl) whose total concentration of calcium and magnesium ions is lower than 30ppm in brine with a content of 35wt%, and controlling the temperature to 50 DEG C, form ammonia content and be the carbonated ammonia brine of 10wt%;
[0018] (3) Pass a certain amount of carbon dioxide gas into the carbonated ammonia brine prepared in step (2), and control the reaction temperature to 80°C, so that the carbonated ammonia brine and carbon dioxide react to form sodium bicarbonate, and then further reduce the temperature and Be constant at 15° C. to obtain a suspension slurry with a sodium bicarbonate crystal content of 20...
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Abstract
The invention discloses a process for jointly producing melamine, sodium carbonate and ammonium chloride by using urea. According to the process, a method which comprises seven steps, i.e., carrying out melamine producing, carrying out bittern or brine refining and exhaust gas absorption, carrying out re-carbonatation alkali separating, carrying out sodium carbonate separating, carrying out sodium bicarbonate mother liquor decomposing, rectifying and denitrifying, carrying out evaporation concentration on deaminated liquor so as to separate sodium chloride, and separating ammonium chloride from a salt clear solution is adopted, the overall utilization ratio of the urea reaches 100%, and exhaust gases generated from melamine production are fully utilized; and a great deal of residual heat and a large volume of steam resulting from a melamine preparation process are also fully utilized, so that energy is saved.
Description
technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a process for jointly producing melamine, soda ash and ammonium chloride by using urea. Background technique [0002] Soda ash, common name soda, stone alkali, sodium carbonate, washing soda, chemical formula Na?CO?, sodium carbonate containing ten crystal water is a colorless crystal, the crystal water is unstable, easy to weather, and becomes white powder Na2CO3, which is a strong electrolyte , has the generality and thermal stability of salt, is easily soluble in water, and its aqueous solution is alkaline. Ammonium chloride is also called brine sand. It is colorless crystal or white crystalline powder; odorless, salty and cool; hygroscopic. The product is soluble in water and slightly soluble in ethanol. Mainly used in the manufacture of dry batteries, storage batteries, ammonium salts, leather tanning, electroplating, precision casting, medicine, ...
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