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A kind of circular manufacturing method of baking soda co-production ammonium chloride

A manufacturing method and technology of baking soda, applied in the directions of ammonium chloride, ammonium halide, carbonate preparations, etc., can solve the problems of difficult industrial application, high process cost, polluted river water sources, etc., and improve productivity and nitrogen content. , the effect of improving yield and purity, and reducing energy consumption

Active Publication Date: 2021-07-27
衡阳爱洁科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of preparing baking soda and co-producing ammonium chloride by double decomposition method, the separated baking soda mother liquor contains NaCl, NaHCO 3 , NH 4 Cl, wherein sodium bicarbonate is in a saturated state. In the prior art, the mother liquor Direct freezing adds NaCl and carries out salting-out, and sodium bicarbonate also precipitates together with ammonium chloride because of supersaturation, and the quality of ammonium chloride product can't reach the requirement of national standard (regulation in the agricultural ammonium chloride national standard of 92 edition: Na + content in ammonium chloride ≤ 1.4%); and the nitrogen content in ammonium chloride products does not reach the national standard of 25%
[0003] However, if the mother liquor is discharged directly, the ammonia nitrogen will seriously pollute the river water source. In order not to discharge waste water, it is often used to recover ammonium chloride and salt by evaporation, but this method has many disadvantages. On the one hand, the mother liquor contains ammonium chloride The total amount of sodium chloride and sodium chloride does not exceed 200g / L, and every ton of ammonium chloride needs to evaporate 5-6 tons of water, and consumes 0.8 tons of coal. In addition, the evaporated salt is difficult to reach industrial-grade standards
These factors make it difficult to industrialize the use of metathesis soda, and the economical practicability is poor
[0004] Chinese patent CN102107889B discloses a method for treating ammonium chloride in baking soda mother liquor at normal temperature. It specifically discloses the baking soda mother liquor after filtration and centrifuge dehydration. The content of free ammonia in the mother liquor is less than 1.3%, and the pH value is 6.5-7.1; hydrochloric acid is reacted with free ammonia and a small amount of ammonium bicarbonate to generate ammonium chloride, and hydrochloric acid is reacted with a small amount of sodium bicarbonate to generate sodium chloride; The consumption is large, the process cost is high, and the mother liquor after salting out is not reclaimed baking soda, the yield of baking soda is 60%~80%

Method used

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  • A kind of circular manufacturing method of baking soda co-production ammonium chloride
  • A kind of circular manufacturing method of baking soda co-production ammonium chloride

Examples

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Embodiment 1

[0031] refer to Figure 1~2 , a cyclic manufacturing device for sodium bicarbonate co-production of ammonium chloride, said device comprises a first-stage separation of baking soda device 5, a cooling analysis device 6, a salting-out device 7 and a mother liquor circulation device connected in sequence, and a secondary separation of baking soda Device 8, one end of the secondary precipitation sodium bicarbonate device 8 communicates with the salting-out device 7, and the other end communicates with the mother liquor circulation device.

[0032] Specifically, the primary sodium bicarbonate precipitation device 5 includes a reaction kettle L1101, a brine tank T1102 and an ammonium bicarbonate feeding device L1103, and the brine tank T1102 and the ammonium bicarbonate feeding device L1103 are in communication with the reactor L1101.

[0033] Also be provided with sodium bicarbonate treatment device between described one-stage separating out baking soda device 5 and cold analysis ...

specific Embodiment 2

[0050] The difference between this example and Example 1 is that the components in the baking soda mother liquor (I) are controlled as NaCl120 g / L, NH4HCO3100g / L, NH4Cl200g / L, SO42-8 g / L during the circulation process ; The ingredients in the baking soda mother liquor (II) are controlled as NaCl 230g / L, NH 4 HCO 3 70g / L, NH 4 Cl 120g / L, SO 4 2-8g / L.

[0051] Calculate the productive rate of baking soda in the production process to be 96%, the productive rate of ammonium chloride to be 95%, and the content of nitrogen in the ammonium chloride product is 24%.

[0052] The working principle of the present invention: a cyclic manufacturing method for the preparation of baking soda and co-production of ammonium chloride in the present invention is based on the principle of phase equilibrium and solubility. The reason why the phase diagram in the system is difficult to balance is that the anions of complexed sodium and ammonium salts are all one Valence compounds make the molecular ...

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Abstract

The present invention relates to a recycling method for producing ammonium chloride with sodium bicarbonate, which comprises sequential primary precipitation of baking soda, cold crystallization, salting out crystallization, and mother liquor circulation. The method also includes salting out crystallization and mother liquor circulation. There is a secondary sodium bicarbonate precipitation step in between, which is used to further precipitate sodium bicarbonate from the sodium bicarbonate mother liquor (I‑II) produced after salting out and crystallization. Adopting the manufacturing method of the present invention can not only reduce the energy consumption of ammonium chloride recovery by cold crystallization, but also efficiently produce baking soda and ammonium chloride, and realize the full cycle of the mother liquor produced by the reaction in the production process, with simple process and low production cost. Low.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for producing baking soda (NaHCO 3 ) by a double decomposition method, and in particular to a circular manufacturing method for preparing baking soda and co-producing ammonium chloride. Background technique [0002] In the production process of preparing baking soda and co-producing ammonium chloride by double decomposition method, the separated baking soda mother liquor contains NaCl, NaHCO 3 , NH 4 Cl, wherein sodium bicarbonate is in a saturated state. In the prior art, the mother liquor Direct freezing adds NaCl and carries out salting-out, and sodium bicarbonate also precipitates together with ammonium chloride because of supersaturation, and the quality of ammonium chloride product can't reach the requirement of national standard (regulation in the agricultural ammonium chloride national standard of 92 edition: Na + content in ammonium chloride ≤ 1.4%);...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/02C01C1/16
CPCC01C1/164C01D7/02C01P2006/80
Inventor 刘松林刘金坤刘瀚宇
Owner 衡阳爱洁科技股份有限公司