Preparation method of ammonium fluoride or ammonium bifluoride
A technology of ammonium bifluoride and ammonium fluoride, which is applied in the direction of ammonium fluoride and ammonium halide, can solve the problems of high use environment and operator requirements, test paper is easily polluted by ambient air, and high maintenance requirements for instruments, so as to achieve precise control of reactions The end point, the long-term stability of product quality, and the effect of improving the production environment
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[0034] The invention provides a method for preparing ammonium fluoride or ammonium bifluoride. The preparation method adopts staged reaction to divide the amount of anhydrous hydrofluoric acid and liquid ammonia into multiple batches. The first batch of anhydrous hydrofluoric acid After adding the acid, neutralize it with the corresponding amount of ammonia, then add the second batch of anhydrous hydrofluoric acid again, then neutralize it with the corresponding amount of ammonia, and add it alternately until the reaction is completely completed. Specifically, the amount of anhydrous hydrofluoric acid and liquid ammonia invented by this name is divided into multiple batches, which can be 2 batches, 3 batches, 4 batches, or 5 batches, depending on the amount of feed Set by yourself, can be divided into five batches at most, at least two batches; too many batches, anhydrous hydrofluoric acid and liquid ammonia valves are closed too frequently, easy to damage; too few batches, the...
Embodiment 1
[0066] A preparation method for ammonium fluoride, comprising the steps of:
[0067] S1. Divide 540kg hydrogen fluoride and 465kg liquid ammonia into 2 batches according to the theoretical feeding amount;
[0068] S2. pump 1t of ammonium fluoride mother liquor into the reactor with graphite tube cooling device;
[0069] S3. In the water cooling state, pass into the anhydrous hydrogen fluoride 270kg of the first batch of feeding amount in the reactor, then slowly pass into the liquid ammonia 233kg of the first batch of feeding amount in the reactor, by controlling the flow of liquid ammonia, The maximum temperature of the reaction system is 85°C;
[0070] S4. After the completion of the ammonia passage in S3, feed 270 kg of anhydrous hydrogen fluoride in the second batch of feed into the reactor, keep the temperature of the reaction system not exceeding 85 ° C, and feed the liquid in the second batch of feed into the reactor. Ammonia 232kg, keep the temperature of the reactio...
Embodiment 2
[0074] A preparation method for ammonium bifluoride, comprising the steps of:
[0075] S1. Divide 2100kg of hydrogen fluoride and 895kg of liquid ammonia into 3 batches according to the theoretical feeding amount;
[0076] S2. pump 2t of ammonium bifluoride mother liquor into the reactor with graphite tube cooling device;
[0077] S3. In the reactor under water cooling state, pass into the anhydrous hydrogen fluoride 700kg of the first batch of feeding amount in the reactor, then slowly pass into the liquid ammonia 299kg of the first batch of feeding amount in the reactor, by controlling the flow of liquid ammonia, Make the maximum temperature of the reaction system 93°C;
[0078] S4. After the completion of the ammonia passage in S3, feed 700 kg of anhydrous hydrogen fluoride in the second batch of feed into the reactor, keep the temperature of the reaction system not exceeding 93°C, and feed the liquid in the second batch of feed into the reactor. Ammonia 298kg, keep the t...
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