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

A technology of baking soda and ammonium chloride, applied in the directions of ammonium chloride, ammonium halide, alkali metal chloride, etc., can solve the problems of poor crystallization quality of heavy alkali, increase of production cost, increase of loss, etc.

Inactive Publication Date: 2018-04-20
DALIAN RES & DESIGN INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0073] All existing melamine plants in my country use the urea process. Except for several imported high-pressure process plants, other production plants use the normal pressure process (below 0.3 MPa) production technology developed by the country itself. Atmospheric pressure method is divided into different production processes such as one-step method and circulating carrier gas method. The normal pressure circulation method has the highest carbon dioxide content in the tail gas, and has the greatest impact on the control of the baking soda production process indicators. 2145kg of NH is produced per 1 ton of melamine produced by normal pressure circulation method 3 , CO 2 Mixed exhaust, where NH 3 The content is 994kg, CO 2 The content is 1130kg, the rest is inert gas, the temperature is 135-145°C, and the pressure is 0.15-0.3MPa(G).

[0074] Such as figure 1 As shown, the ammonia and carbon dioxide tail gas obtained from the production of melamine is passed into the tr...

Embodiment 2

[0090] Use urea as raw material to produce melamine by normal pressure circulation method, and produce 2200kg of NH for every 1t of melamine produced 3 , CO 2 Mixed exhaust, where NH 3 The content is 1019kg, CO 2 The content is 1159kg, the temperature is 135-145°C, and the pressure is 0.15-0.3MPa(G).

[0091] Pass the tail gas containing ammonia and carbon dioxide obtained from the production of melamine into the triamine tail gas ammonia absorption tower, absorb it with 35-40°C light ammonia brine from the deammonization tail gas ammonia suction tower, and obtain carbonated ammonia brine after cooling and clarification. Carbonated ammonia brine containing NaCl is 257.4~263.3g / L, FNH 3 / Na + 1.12~1.16, the temperature is 38~42°C, and the degree of carbonation of the carbonated ammonia brine should be controlled to be less than 80%, and the insufficient NH 3 Supplementation is regulated by the absorption of pure ammonia.

[0092] The carbonated ammonia brine is passed int...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/18C01C1/16C01D3/04
CPCC01C1/164C01D3/04C01D7/18
Inventor 郜长水杨凤君李楠徐晓辉张泽福张世伟南震关民尹洪君曹禹尚金泉张鸿煜
Owner DALIAN RES & DESIGN INST OF CHEM IND
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