Technology for producing sodium bicarbonate and ammonium chloride by using triamine tail gas

Abstract

The invention discloses a technology for producing sodium bicarbonate and ammonium chloride by using triamine tail gas. The technology takes ammonia and carbon dioxide-containing melamine tail gas aswell as bittern or brine as raw materials, and adopts the technical processes of bittern or brine purification, tail gas deamination, triamine tail gas ammonia suction, ammoniacal brine carbonation, sodium bicarbonate separation, sodium bicarbonate pulp-mixing, wet decomposition, clarification and refined filtration, alkali liquor re-carbonation, sodium bicarbonate centrifugal drying, sodium bicarbonate filtrate deamination, multiple-effect evaporation and concentration salt manufacturing, multiple-effect flash vaporization ammonium manufacturing and separating and drying and the like to enable the tail gas generated through melamine production by urea is effectively used. The technology provided by the invention overcomes the defects that the spent liquor discharge amount of an ammonia-soda process is large and the mother solution of a combined alkaline manufacturing method is difficult to balance, the floor space of a device is small, and only low grade steam is used.

Description

technical field [0001] The invention relates to a combined production process of melamine tail gas recovery and sodium bicarbonate ammonium chloride. It specifically relates to a method for preparing sodium bicarbonate and ammonium chloride from tail gas produced from melamine by using urea as a raw material. Background technique [0002] Melamine (C 3 h 6 N 6 ), also known as melamine, is an important basic organic chemical raw material, widely used in coatings, building materials, papermaking, leather, textiles and other industries. Melamine and formaldehyde are condensed to produce melamine formaldehyde resin, which has excellent properties such as heat resistance, corrosion resistance, arc resistance, high gloss, and high hardness. Melamine resin is kneaded with fillers, pigments, and lubricants to make thermosetting aminoplasts with superior performance. The modified melamine formaldehyde resin can be made into paints such as baking varnishes with bright color, dur...

AI Technical Summary

Problems solved by technology

The recovery and comprehensive utilization of triamine tail gas is the bottleneck restricting the production of melamine, which affects the overall economic benefits of the enterprise

However, there are also great disadvantages in the cold process combined soda, mainly because the equivalent of the mother liquor is large, and the utilization coefficient of the equipment volume is low; the system water must maintain a balance of revenue and expenditure, otherwise the amount of mother liquor will increase and it will be difficult to deal with and increase the loss; the heavy alkali generated by carbonation The crystallization quality is worse than the ammonia-soda method, which increases the production cost of the subsequent process; large-scale combined soda plants can only use washing salt or high-quality solid salt

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