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Technique for preparing ammonium chloride by employing sodium bicarbonate production wastewater as raw material

A process method, baking soda technology, applied in the direction of ammonium halide, alkali metal chloride, etc., can solve the problems of high production cost, high energy consumption, low thermal efficiency, etc., achieve production cost reduction, increase heat transfer area, evaporation transfer The effect of high thermal efficiency

Active Publication Date: 2015-03-11
HUNAN XIANGHENG SALT CHEM
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Problems solved by technology

This invention adopts four-effect evaporation to produce ammonium chloride, but in the evaporation process of production, there is no step-by-step preheating of the soda-making filtered mother liquor; The system realizes the crystallization of ammonium through the treatment process of steam spraying and cooling to 25°C~35°C. It is not specified whether the flasher system adopts multi-stage flash or single-stage flash treatment; the inventive process consumes a lot of energy. Low thermal efficiency and high production cost

Method used

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  • Technique for preparing ammonium chloride by employing sodium bicarbonate production wastewater as raw material
  • Technique for preparing ammonium chloride by employing sodium bicarbonate production wastewater as raw material

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] figure 1 In , the thick solid line represents steam, the thin solid line represents liquid, and the dashed line represents condensed water.

[0027] refer to figure 1 A kind of process of preparing ammonium chloride as a raw material with baking soda production waste liquid of the present embodiment, the steps are as follows:

[0028] 1) Baking soda production waste liquid enters the waste water mother liquor pool, is pumped into the fifth preheater, and then enters the fourth preheater. After heating up to 45°C, it enters the deamination tower for deammonization, and the ammonia gas enters the washing tower. The tail gas enters the condenser, and the ammonia liquid is sent to the ammonia liquid pool;

[0029] 2) The preheated mother liquor is pumped from the deamination tower into the IV effect evaporation tank, evaporated and concentrated (t...

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Abstract

The invention discloses a technique for preparing ammonium chloride by employing a sodium bicarbonate production wastewater as a raw material. The technique comprises the following procedures: carrying out efficient preheating and deamination treatment on the sodium bicarbonate production wastewater; carrying out four-effect reflux feeding and vacuum evaporation; preparing sodium chloride and ammonium chloride by combining three-level flashing with primary spraying cooling; carrying out dewatering and drying treatment. The technique is low in energy consumption, high in yield of a production device, and low in production cost of a product.

Description

technical field [0001] The invention relates to a process method for preparing ammonium chloride by using waste liquid containing ammonium chloride and sodium chloride as a raw material, in particular to a process method for preparing ammonium chloride by using waste liquid from baking soda production as a raw material. Background technique [0002] Baking soda is produced by metathesis reaction using brine and ammonium bicarbonate as raw materials. During the production process, a large amount of mother liquor containing ammonium chloride, sodium chloride, sodium bicarbonate, sodium sulfate and other substances will be produced. The treatment directly discharges the mother liquor with the wastewater, which not only wastes resources, but also causes serious pollution to the environment. The preparation of ammonium chloride from the waste liquid of baking soda production can turn waste into treasure and protect the environment. [0003] At present, the processing method of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/16C01D3/04
Inventor 谢求实唐世俭秦盛
Owner HUNAN XIANGHENG SALT CHEM
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