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Improved wet process and apparatus for producing ammonium bifluoride

A technology of ammonium bifluoride and process, which is applied in the field of wet production ammonium bifluoride process and equipment improvement, can solve the problems of uneven crystal particle size, unrecovered tail gas, poor heat transfer effect, etc., and achieve good product quality and use Long life and less pollution effect

Active Publication Date: 2007-11-07
ZHEJIANG SANMEI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional wet method of ammonium bifluoride production uses crystallization in open plastic barrels or plastic tanks. This production method has the following problems: first, the heat transfer effect is not good; second, due to manual stirring during crystallization, the safety is poor; The third is that the crystallization speed is not controlled and the stirring is uneven, and the thickness of the crystal particles is uneven, which affects the product quality; the fourth is that the tail gas is not recovered, resulting in serious environmental pollution and high raw material consumption.
[0005] There is no relevant literature to report on the process and equipment improvement method of wet production of ammonium bifluoride

Method used

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  • Improved wet process and apparatus for producing ammonium bifluoride

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Effect test

Embodiment 1

[0030] According to the above process flow and steps, feed 900Kg AHF, 390KgNH into reactor 1 3 , the reaction temperature is 95°C, and when the pH value at the end of the reaction is 3.2, the temperature of the mother liquor in the crystallization tank 2 is 80°C, and the cooling rate is 1-2°C / h. The ammonium bifluoride product output, quality and consumption situation that obtain are shown in Table 1.

[0031] Output T

Embodiment 2

[0033] According to the operation procedure of embodiment 1, the pH value of the reaction end point is 2, 3, 4, 5 four conditions, when other conditions are constant, the ammonium bifluoride product yield, quality and consumption situation are shown in Table 2.

[0034] PH value

[0035] Conclusion: Other conditions remain the same, when the pH control value of the reaction end point is changed, the appearance of the product remains unchanged; with the increase of the pH control value of the reaction end point, the output decreases, the main content decreases, the acid consumption of AHF decreases, and the NH 3 Consumption increases; therefore, the pH value at the end of the reaction is preferably controlled at 3-4.

Embodiment 3

[0037] According to the operation steps of Example 1, the crystallization cooling rate is controlled under four conditions of 0~1, 1~2, 2~3, 3~4°C / h, and when other conditions are constant, the output, quality and consumption of the ammonium bifluoride product obtained See Table 3.

[0038] Cooling rate °C / h

[0039] Conclusion: Changing the cooling rate of crystallization has no effect on the output, main content, and consumption of raw materials of the product; but with the acceleration of the cooling rate, the product has uneven fineness, easy agglomeration, and different shapes, and the crystallization kettle is easy to form walls. Therefore, the cooling rate is best controlled at 0-2°C / h.

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Abstract

The present invention discloses improved wet process and apparatus for producing ammonium bifluoride. The process includes the following steps: reacting certain amount of mother liquid, ammonia and anhydrous hydrogen fluoride in a plastic reactor with cooling coil; preheating certain amount of mother liquid in a crystalline kettle, adding the resultant while stirring, and slowly cooling to crystallize; dewatering the crystallized product in a centrifuge and stoving to obtain the product, and absorbing the tail gas with mother liquid. The process has simple operation, high yield, high product quality, low power consumption, less pollution and other advantages.

Description

technical field [0001] The invention relates to a production method of ammonium bifluoride, in particular to an improved method and equipment for wet production of ammonium bifluoride. Background technique [0002] Ammonium bifluoride is mainly used for surface treatment of aluminum alloys, chemical reagents, glass etchant (often used together with hydrofluoric acid), fermentation industry disinfectant, preservative, solvent for making metal beryllium from beryllium oxide, and surface treatment of silicon steel plates. Used in the manufacture of ceramics and magnesium alloys. Ammonium bifluoride is widely used in industry and has broad market prospects. [0003] There are two production methods of ammonium bifluoride: wet method and dry method. The dry method is directly synthesized from gaseous ammonia and pure hydrogen fluoride gas, and the production cost of the dry method is relatively high. The wet method is synthesized with hydrofluoric acid and ...

Claims

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Application Information

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IPC IPC(8): C01C1/16
Inventor 占林喜徐武平
Owner ZHEJIANG SANMEI CHEM IND
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