Production method of anhydrous ammonium hydrogen fluoride

An anhydrous hydrogen fluoride and production method technology, applied in ammonium halide and other directions, can solve the problems of easy agglomeration, high equipment requirements, limited source of raw materials, etc., and achieve reasonable production process design, low equipment condition requirements, and expanded application scope. Effect

Inactive Publication Date: 2011-07-06
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, man

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 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℃-80℃, and use it during the reaction The cooling water is cooled 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 and enter the vacuum low-temperature concentration. The temperature is controlled between 65°C and 90°C, the vacuum degree is controlled between 0.5 and 0.95pa, so that the ammonium fluoride and 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. The temperature is controlled between 130°C and 200°C, and the negative press...

Example Embodiment

[0025] Example 2

[0026] 1. Use hydrofluoric acid or anhydrous hydrogen fluoride and liquid ammonia to carry out the neutralization reaction in the reactor, control the PH value between 4.5 and 5, control the temperature between 50 ℃-70 ℃, use during the reaction The cooling water is cooled 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 and enter the vacuum low-temperature concentration. The temperature is controlled between 70℃-85℃, and the vacuum degree is controlled between 0.6-0.85pa, so that the ammonium fluoride and 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, the temperature is controlled between 140℃-190℃, and the negative pressure in th...

Example Embodiment

[0030] Example 3

[0031] 1. Use hydrofluoric acid or anhydrous hydrogen fluoride and liquid ammonia to neutralize the reaction in the reactor, control the PH value between 4-5.5, and control the temperature between 55°C and 65°C. Use during the reaction The cooling water is cooled 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 and enter the vacuum low-temperature concentration. The temperature is controlled between 75℃-80℃, and the vacuum degree is controlled between 0.7-0.8pa, so that the ammonium fluoride and 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 kettle. The temperature is controlled between 150°C and 180°C, and the negative pressure in the ket...

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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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IPC IPC(8): C01C1/16
Inventor 应烈荣
Owner 应烈荣
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