Process method for recovering ammonium chloride and sodium chloride from waste water containing ammonium chloride and sodium chloride

A process method, ammonium chloride technology, applied in the direction of chemical instruments and methods, ammonium halide, alkali metal chloride, etc., can solve the problems of strong corrosion of centrifuges, strong equipment, no sodium chloride, etc., to solve equipment corrosion , Reduce energy consumption and save water resources

Inactive Publication Date: 2009-09-30
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are two major difficulties in the production of this method: one is that a large amount of water must be evaporated to recover ammonium chloride and sodium chloride, and the energy consumption is large and the cost is high; the other is that the ammonium chloride solution produces extremely strong corrosion to the equipment, Even if expensive titanium is used, there are still corrosion problems in the equipment under the condition of high temperature and high concentration
[0003] Chinese patent CN101244829A discloses reclaiming ammonium chloride and sodium chloride from the soda-making mother liquor, and its evaporation has adopted vacuum multi-effect countercurrent evaporation, but its energy...

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  • Process method for recovering ammonium chloride and sodium chloride from waste water containing ammonium chloride and sodium chloride
  • Process method for recovering ammonium chloride and sodium chloride from waste water containing ammonium chloride and sodium chloride

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Embodiment 1

[0026] Embodiment 1: the mother liquor (containing ammonium chloride 17.5%, sodium chloride 7.5%) that metathesis reaction produces baking soda process is preheated to 70 ℃ continuously through stoste exhaust steam preheater and plate preheater, pump flow rate 20m 3 / h, into the ammonia distillation tower for deammonization treatment; then the mother liquor is sequentially input into the third effect evaporator (φ650×12000), the first effect evaporator (φ800×12000), and the second effect evaporator (φ750×13000) for heating Evaporation, the boiling point of the third-effect solution is controlled at 60°C, concentrated to a concentration of 32%, the boiling point of the first-effect solution is controlled at 120°C, concentrated to a concentration of 42%, the second-effect evaporation crystallizer is heated to evaporate and crystallized, and the boiling point of the solution is controlled at 90 ℃, concentrated to a concentration of 43%, and the crystallization temperature is contr...

Embodiment 2

[0030] Embodiment 2: the mother liquor (containing ammonium chloride 17%, sodium chloride 8%) that metathesis reaction produces sodium bicarbonate process produces, is preheated to 65 ℃ continuously through stoste exhaust steam preheater and plate preheater, pump flow 30m 3 / h, into the ammonia distillation tower for deammonization treatment; then the mother liquor is sequentially input into the third effect evaporator (φ750×12000), the first effect evaporator (φ900×12000), and the second effect evaporator (φ850×13000) to evaporate The boiling point of the solution in the first effect evaporator is controlled at 110°C and concentrated to a concentration of 43%. The boiling point of the solution in the third effect evaporator is controlled at 58°C and concentrated to a concentration of 30%. The second effect evaporator crystallizer is heated to evaporate and crystallize , the boiling point of the solution is controlled at 86°C, concentrated to a concentration of 42%, and the cry...

Embodiment 3

[0034] Embodiment 3: the soda-making mother liquor (containing ammonium chloride 16%, sodium chloride 6.4%) that produces in the production of soda ash is preheated continuously to 55 ℃ through stoste exhaust steam preheater and plate preheater, pump flow 50m 3 / h, into the ammonia distillation tower for deammonization treatment; then the mother liquor is sequentially input into the third effect evaporator (φ1200×12000), the first effect evaporator (φ900×12000), and the second effect evaporator (φ950×13000) to evaporate The boiling point of the solution in the third effect evaporator is controlled at 55°C and concentrated to a concentration of 28.5%. The boiling point of the solution in the first effect evaporator is controlled at 115°C and concentrated to a concentration of 40%. The second effect evaporator crystallizer is heated to evaporate and crystallize , the boiling point of the solution is controlled at 92°C, concentrated to a concentration of 43%, and the crystallizati...

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Abstract

The invention relates to a process method for recovering ammonium chloride and sodium chloride from waste water containing the ammonium chloride and the sodium chloride, which produces the ammonium chloride and the sodium chloride by using mother solution which is generated in a process for producing sodium bicarbonate by natural bittern double decomposition reaction and contains the ammonium chloride and the sodium chloride as raw materials. The method adopts ammonium still, evaporation, crystallization and separation process to treat, wherein the evaporation adopts multiple-effect, a heat pump and a vacuum evaporation process, and selects a falling film evaporator and a forced circulation type evaporator to perform triple-effect mixed-flow procedure, so that sodium chloride is crystallized and separated in the evaporation; and the ammonium chloride is crystallized and separated by cooling after the evaporation. The method effectively reduces the operation temperature of the equipment, can repeatedly use secondary steam and condensed water, reduces erosion of the ammonium chloride solution to the equipment, saves the energy, reduces the cost, improves the production efficiency, and reduces environmental pollution.

Description

technical field [0001] The invention relates to a process for recovering ammonium chloride and sodium chloride from waste water containing ammonium chloride and sodium chloride. The mother liquor is used as raw material to produce ammonium chloride and sodium chloride. Background technique [0002] The natural brine method utilizes metathesis reaction to produce baking soda. During the production process, a large amount of high-concentration ammonium chloride mother liquor will be discharged. Most enterprises directly discharge the mother liquor into rivers with wastewater without treatment, which not only wastes resources, but also causes serious pollution to the environment. Recovering ammonium chloride and sodium chloride from double decomposition baking soda mother liquor can turn waste into wealth and protect the environment. The treatment method of ammonium chloride filtered mother liquor in the soda ash industry by combined alkali method generally adopts the "cold me...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/16C01D3/04C01D1/04C01D1/20C01D1/38B01D9/02
CPCY02P20/129
Inventor 史晓平刘常松魏峰胡柏松
Owner HEBEI UNIV OF TECH
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