Clean production method for co-production of ammonium bicarbonate through combination of high purity carbon dioxide and melamine tail gas

Abstract

The present invention relates to a clean production method for co-production of ammonium bicarbonate through combination of high purity carbon dioxide and melamine tail gas. According to the clean production method, carbon dioxide gas in a large nitrogen fertilizer device is subjected to decompression; the decompressed carbon dioxide gas and melamine tail gas are subjected to a reaction in a main carbonization tower, wherein the melamine tail gas is subjected to absorption condensation; and then a thickener treatment, centrifugation separation and packaging are performed to obtain an ammonium bicarbonate product, wherein the carbonized dilute mother liquor and the centrifugated waste liquid enter recycling. According to the present invention, high purity carbon dioxide gas is adopted, such that the effective concentration of the carbon dioxide actually participating in the reaction is increased, and production capacity is significantly increased compared with the carbonation equipment having the same size; the dilute mother liquor from the ammonium bicarbonate production is recycled so as to achieve clean production; and the purity of the carbon dioxide gas is high, and the impurity content is significantly reduced so as to easily improve product quality.

Description

technical field [0001] The invention relates to a production method of ammonium bicarbonate, in particular to a clean production method of high-purity carbon dioxide combined with melamine tail gas to co-produce ammonium bicarbonate. Background technique [0002] At present, how to deal with melamine tail gas economically is a big problem for melamine manufacturers, especially the tail gas treatment of melamine produced by low-pressure gas phase method is a headache for many manufacturers. In the method for producing melamine by the low-pressure gas phase method, about 2.05 tons of tail gas will be produced by-product while producing one ton of melamine product; the tail gas components are mainly carbon dioxide and ammonia, and the ratio of the two is about 1:1 (wt%) , How to better recycle the exhaust gas has become an important factor to provide comprehensive competitiveness of melamine products. [0003] It is known that there are multiple methods for treating melamine t...

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Problems solved by technology

[0006] 1) The cogeneration system contains a considerable portion of inert gas, resulting in increased power consumption;

[0007] 2) The effective gas content is low, and the processing capacity of the equipment is limited to a certain extent;

[0008] 3) The amount of gas entering the carbonization section is large but the amount of effective gas is low, the reaction is slow and the gas bubbling is too violent, which is not conducive to the production of larger crystalline ammonium bicarbonate products;

[0009] 4) The gas purity is low, it inevitably contains a certain amount of impurities, and the product quality is also affected to a certain extent

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