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Technology for producing industrial-grade ammonium chloride by quadruple-effect evaporation heat method

A four-effect evaporation, ammonium chloride technology, applied in the direction of ammonium halide, alkali metal halide purification, etc., can solve the problems of high energy consumption, low product purity, limited scope of industrial use of sodium chloride, etc., to achieve low energy consumption , good separation effect, obvious effect of energy saving

Inactive Publication Date: 2013-03-27
湖南海联三一小苏打有限公司
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Problems solved by technology

The obvious disadvantage of this process is high energy consumption, steam consumption of 2.5-3.0 tons per ton of product; sodium chloride and ammonium chloride eutectic phenomenon is serious, the product purity is not high, ammonium chloride can only be used for agricultural fertilizers , the scope of industrial use of sodium chloride is limited

Method used

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Embodiment Construction

[0010] 1. Filter the mother liquor after deamination and degassing, the content of ammonium chloride is 160-195g / L, and the content of sodium chloride is 60-95g / L, and it is continuously transported to the first stage of the multi-effect evaporation system in the way of countercurrent feeding. Fourth effect, third effect, second effect, and finally the first effect of DTB evaporator is used for vacuum temperature-controlled evaporation. The temperature of the first effect is controlled at 98°C~110°C, the temperature of the fourth effect is 46°C~58°C, and the vacuum degree is -680mmHg To –740mmHg, at the same time, the boiler steam is directly input into the first effect heater in the direction of flow, the secondary steam generated by the first effect has a steam pressure of 0.009 ~ 0.01MPa, part of it returns to the first effect heater through the heat pump, and the other part is sent to the second effect heating The secondary steam generated by the second effect is sent to th...

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Abstract

The invention discloses a technology for producing industrial-grade ammonium chloride by a quadruple-effect evaporation heat method. The technology is characterized by comprising the steps of evaporation, salt and ammonium crystallization, slurry washing, dehydration and drying. A new technology for realizing quadruple-effect evaporation, backflow feed, first-effect salt precipitation and steam injection ammonium precipitation is provided for producing ammonium chloride with an industrial heat method. The evaporation efficiency is improved, the steam is used for multiple times, and the energy saving effect is obvious; the evaporation is smoother through backflow feed; the concentration of ammonium chloride in the first-effect liquid is the highest, and the precipitation of the sodium chloride is relatively thorough, thereby being favorable for salt-ammonium separation; and the cooling crystallization effect of steam injection ammonium precipitation is good, and a flash thickening and granulation effect is realized. Compared with a triple-effect evaporation, direct-flow feed and two-effect salt precipitation technology, the energy consumption is little, the cost is low, the steam consumption is reduced to 0.95-1.10 tons of steam per ton of product, the salt and ammonium separation effect is good, the quality of the ammonium chloride product is superior to the international quality, and the ammonia content reaches 25.2-26.0%.

Description

technical field [0001] The invention relates to a chemical production technology, in particular to a process for producing industrial-grade ammonium chloride by a four-effect evaporation heat method. Background technique [0002] At present, in the process of thermally producing ammonium chloride and recovering industrial sodium chloride, three-effect evaporation, downstream feeding, and two-effect salt precipitation processes are generally used. The obvious disadvantage of this process is high energy consumption, steam consumption of 2.5-3.0 tons per ton of product; sodium chloride and ammonium chloride eutectic phenomenon is serious, the product purity is not high, ammonium chloride can only be used for agricultural fertilizers , the scope of industrial use of sodium chloride is limited. Contents of the invention [0003] The purpose of the present invention is in order to overcome the above-mentioned weak point of prior art, and provide a kind of energy consumption is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16C01D3/16
Inventor 周小平李业泳周游
Owner 湖南海联三一小苏打有限公司
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