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Production method of anhydrous ammonium hydrogen fluoride

A technology of anhydrous hydrogen fluoride and production methods, applied in the direction of ammonium halide, etc., can solve problems such as easy agglomeration, high equipment requirements, and inability to use, and achieve the effects of reasonable production process design, low equipment requirements, and improved product quality

Inactive Publication Date: 2014-05-14
应烈荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of using this method are: 1. Anhydrous hydrogen fluoride must be used, which limits the source of raw materials, and the cost is high; 2. The material is gasified, reacted, defluorinated and ammonia removed, cooled, recycled, and formed, and the process is relatively long , high equipment requirements, low production capacity, correspondingly increased costs
The product contains 3%-5% moisture, which cannot be used in places with high requirements, and is easy to agglomerate. In order to prevent agglomeration, many domestic manufacturers add anti-agglomeration additives to the product, but it will affect the use. If the drying process is added and the temperature is not properly controlled, the product will decompose, pollute the environment and increase the cost; because the reaction end point of the ammonium bifluoride produced by the liquid phase method is indicated by the pH value, the product is a mixture of ammonium fluoride and ammonium bifluoride. The chemical reaction principle is: HF+H 2 O+NH 3 -NH 4 f 2 +NH 4 F+H 2 o

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Use hydrofluoric acid or anhydrous hydrogen fluoride and liquid ammonia to carry out neutralization reaction in the reactor, control the pH value between 3.5-6, control the temperature between 40°C--80°C, use Cooling with cooling water to generate a mixed solution of ammonium fluoride and ammonium bifluoride;

[0022] 2. Pump the mixed solution of ammonium fluoride and ammonium bifluoride into the concentration tower to enter the vacuum low-temperature concentration. The temperature is controlled between 65°C--90°C, and the vacuum degree is controlled between 0.5-0.95pa, so that ammonium fluoride and ammonium fluoride The concentration of the mixed solution of ammonium bifluoride reaches more than 70%;

[0023] 3. Pump the mixed solution of ammonium fluoride and ammonium bifluoride with a concentration of more than 70% into the high-temperature conversion kettle. After 10-20 minutes, the ammonia gas decomposed in the conversion is introduced into the reactor for rec...

Embodiment 2

[0026] 1. Use hydrofluoric acid or anhydrous hydrogen fluoride and liquid ammonia to carry out neutralization reaction in the reactor, control the pH value between 4.5-5, control the temperature between 50°C--70°C, use Cooling with cooling water to generate a mixed solution of ammonium fluoride and ammonium bifluoride;

[0027] 2. Pump the mixed solution of ammonium fluoride and ammonium bifluoride into the concentration tower kettle to enter the vacuum low-temperature concentration. The temperature is controlled between 70°C--85°C, and the vacuum degree is controlled between 0.6-0.85pa, so that ammonium fluoride and ammonium fluoride The concentration of the mixed solution of ammonium bifluoride reaches more than 70%;

[0028] 3. Pump the mixed solution of ammonium fluoride and ammonium bifluoride with a concentration of more than 70% into the high-temperature conversion kettle. After 10-20 minutes, the ammonia gas decomposed in the conversion is introduced into the reactor ...

Embodiment 3

[0031] 1. Use hydrofluoric acid or anhydrous hydrogen fluoride and liquid ammonia to carry out neutralization reaction in the reactor, control the pH value between 4-5.5, control the temperature between 55°C--65°C, use Cooling with cooling water to generate a mixed solution of ammonium fluoride and ammonium bifluoride;

[0032] 2. Pump the mixed solution of ammonium fluoride and ammonium bifluoride into the concentration tower to enter the vacuum low-temperature concentration. The temperature is controlled between 75°C--80°C, and the vacuum degree is controlled between 0.7-0.8pa, so that ammonium fluoride and ammonium fluoride The concentration of the mixed solution of ammonium bifluoride reaches more than 70%;

[0033] 3. Pump the mixed solution of ammonium fluoride and ammonium bifluoride with a concentration of more than 70% into the high-temperature conversion tank. After 10-20 minutes, the ammonia gas decomposed in the conversion is introduced into the reactor for recycl...

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PUM

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Abstract

The invention discloses a production method of anhydrous ammonium hydrogen fluoride. The production method comprises the following steps: 1, a neutralization reaction occurs between hydrous hydrofluoric acid or anhydrous hydrofluoric acid and liquid ammonia in a reaction kettle to produce a mixed solution of ammonium fluoride and ammonium hydrogen fluoride; 2, the mixed solution of ammonium fluoride and ammonium hydrogen fluoride is pumped into a concentration tower for vacuum low-temperature concentration so that the concentration of the mixed solution of ammonium fluoride and ammonium hydrogen fluoride reaches more than 70%; 3, the mixed solution of ammonium fluoride and ammonium hydrogen fluoride with the concentration more than 70% is pumped to a high-temperature transformation kettle, and ammonia gas that is decomposed during the transformation process is guided into the reaction kettle for recovery; and 4, a discharge valve of the high-temperature transformation kettle is opened so that the material flow passes through a scraping machine to produce sheet-like anhydrous ammonium hydrogen fluoride. The production method is reasonable in design, has lower requirements for equipment conditions, is easy to promote, and plays a positive role in environmental protection as well as comprehensive resource utilization.

Description

technical field [0001] The invention relates to a production method of anhydrous ammonium bifluoride, which belongs to the field of chemical production. Background technique [0002] At present, the production of anhydrous ammonium bifluoride in foreign countries uses anhydrous hydrogen fluoride and liquid ammonia as raw materials. These two raw materials are first gasified, reacted under gaseous conditions, and excess hydrogen fluoride and ammonia are removed under molten conditions, and then cooled, formed, Made into products, the chemical reaction principle is: 2AHF (gas phase) + NH 3 (gas phase)-NH 4 HF 2 . The problems of using this method are: 1. Anhydrous hydrogen fluoride must be used, which limits the source of raw materials, and the cost is high; 2. The material is gasified, reacted, defluorinated and ammonia removed, cooled, recycled, and formed, and the process is relatively long , high equipment requirements, low production capacity, correspondingly increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/16
Inventor 应烈荣
Owner 应烈荣