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Preparation method of ammonium fluoride

A technology of ammonium fluoride and anhydrous hydrogen fluoride, which is applied in the direction of ammonium halide, etc., can solve the problems of long-term storage, high water content, and easy caking of products, and achieve the effect of low water content, storage resistance, and non-caking

Active Publication Date: 2014-12-17
FUJIAN YONGJING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonium fluoride produced by the traditional liquid phase method has disadvantages such as high water content, easy caking, and inability to store for a long time

Method used

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  • Preparation method of ammonium fluoride

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Pour the mother liquor into the reaction tank, the liquid level is 75 ~ 80cm, calculate the feeding amount according to the weight ratio of liquid ammonia and anhydrous Water hydrogen fluoride 100kg, and finally add the remaining liquid ammonia and anhydrous hydrogen fluoride slowly at the same time, control the reaction temperature to 110°C, if the temperature rises too fast, adjust it by reducing the amount of feed or turning on the cooling water, the reaction pressure is normal pressure, and the reaction is at Continuously, evenly, slowly, and stably. When the end point of feeding is 50kg away (calculated as liquid ammonia), check the pH value, and then make corresponding adjustments according to the test results, so that the pH of the reaction end point is 5. After the reaction is over, put the reaction product into a crystallization bucket made of PP for cooling and crystallization. A cooling water pipe is installed on the crystallization bucket. Cooling water with ...

Embodiment 2

[0025] Pour the mother liquor into the reaction tank, the liquid level is 75 ~ 80cm, calculate the feeding amount according to the weight ratio of liquid ammonia to anhydrous hydrogen fluoride 2.45, under the condition of stirring, first slowly add 60kg of liquid ammonia, and then slowly add anhydrous 110kg of hydrogen fluoride, and finally add the remaining liquid ammonia and anhydrous hydrogen fluoride slowly at the same time, and control the reaction temperature to 105°C. , Evenly, slowly, and stably. When it is 50kg away from the end point of feeding (calculated as liquid ammonia), check the pH value, and then make corresponding adjustments according to the test results, so that the pH of the reaction end point is 5.5. After the reaction is over, put the reaction product into a crystallization bucket made of PP for cooling and crystallization. A cooling water pipe is installed on the crystallization bucket. Cooling water with a temperature of 30°C is passed through the cool...

Embodiment 3

[0027] Put the mother liquor into the reaction tank, the liquid level is 75-80cm, calculate the feeding amount according to the weight ratio of liquid ammonia and anhydrous hydrogen fluoride is 2.42, first slowly add 55kg of liquid ammonia, then slowly add 105kg of anhydrous hydrogen fluoride, and finally At the same time, slowly add the remaining liquid ammonia and anhydrous hydrogen fluoride, and control the reaction temperature to 90°C. When the temperature rises too fast, use the method of reducing the amount of feed or turn on the cooling water to adjust. The reaction pressure is normal pressure, and the reaction is continuous, uniform and slow. , Stable, and when it is 50kg away from the end point of feeding (calculated as liquid ammonia), check its pH value, and then adjust the remaining amount of liquid ammonia and anhydrous hydrogen fluoride according to the test results to make the pH of the reaction end point 6. After the reaction is over, put the reaction product in...

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Abstract

The invention relates to a preparation method of ammonium fluoride. The preparation method comprises the following steps of: 1, adding mother liquor to a reaction tank, and then adding liquid nitrogen and anhydrous hydrogen fluoride under a stirring state for reacting; and 2, processing the reaction liquid by cooling, crystallizing, centrifugally separating and drying to obtain the ammonium fluoride, wherein the mother liquor is the liquid obtained by centrifugally separating the reaction liquid in the step 1. Compared with the prior art, the preparation method has the advantages that the ammonium fluoride is low in water content and hard to block, can be stored for a long term, and is high in quality and low in cost.

Description

technical field [0001] The invention belongs to the field of chemical production, in particular to a preparation method of ammonium fluoride. Background technique [0002] Ammonium fluoride, the molecular formula is NH4F, the relative molecular mass is 37.04, the relative density is 1.015 (25°C), colorless leaf-like or needle-like crystals, and becomes hexagonal columnar crystals after sublimation; it is easy to deliquesce and agglomerate, soluble in cold water, micro Soluble in alcohol, insoluble in acetone and liquid ammonia. It decomposes and loses ammonia when it is heated or meets hot water, and transforms into more stable ammonium fluoride. Ammonium fluoride is widely used, such as glass etchant, chemical polishing agent on metal surface, wood and wine preservative, disinfectant, fiber mordant and solvent for extracting rare elements, etc. Masking agent, wine-making disinfectant, preservative, fiber mordant, etc. [0003] The traditional production method of ammoniu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/16
Inventor 万群平徐荣春吴云秀
Owner FUJIAN YONGJING TECH CO LTD