Preparation method of guaranteed-reagent potassium nitrate
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A potassium nitrate, high-grade pure technology is applied in the field of inorganic compound preparation, and can solve the problems of low purity of potassium nitrate, inability to meet electronic requirements, complex process steps, etc., and achieve the effects of low impurity content, simple process steps and high purity
Inactive Publication Date: 2016-02-10
TIANJIN CHEM REAGENT RES INST
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Problems solved by technology
The potassium nitrate produced in this way has low purity, high impurity content and complex
Method used
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Embodiment 1
[0016] A preparation method of superior grade pure potassium nitrate, the method is as follows:
[0017] ⑴Purification of industrial potassium nitrate, removal of impurity iron
[0018] Put 0.5Kg of industrial potassium nitrate into a glass beaker, dissolve it in 400ml of distilled water, heat it on an electric furnace at a heating temperature of 85°C to dissolve it, then add 0.05Kg of potassium carbonate, heat it to 110°C, and precipitate under constant stirring. Set aside for 2 hours and filter to obtain solution A.
[0019] ⑵Recrystallization to obtain superior grade pure potassium nitrate
[0020] Concentrate the solution A obtained in step (1) at a temperature of 170°C, precipitate crystals and cool, spin dry, and recrystallize once again, spin dry the crystals, move them into an electric oven at 75°C, and dry for 5 hours to obtain superior pure potassium nitrate.
[0021] In step (1), potassium nitrate: distilled water: the weight ratio of potassium carbonate is 1.25:1...
Embodiment 2
[0023] A preparation method of superior grade pure potassium nitrate, the method is as follows:
[0024] ⑴Purification of industrial potassium nitrate, removal of impurity iron
[0025] Put 1.5Kg of industrial potassium nitrate into a glass beaker, dissolve it in 1200ml of distilled water, heat it on an electric furnace, and heat it to 115°C. With constant stirring, precipitation occurs, let stand for 2.5 hours, and filter to obtain solution A.
[0026] ⑵Recrystallization to obtain superior grade pure potassium nitrate
[0027] Concentrate the solution A obtained in step (1) at a temperature of 175°C, precipitate crystals, cool down, spin dry, recrystallize once, spin dry, move into an electric oven at 80°C, and dry for 4 hours to obtain superior pure potassium nitrate.
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Abstract
The invention relates to a preparation method of guaranteed-reagent potassium nitrate, which includes the following steps: 1) purification and iron impurity removal of industrial potassium nitrate: placing the industrial potassium nitrate in a glass beaker, dissolving the industrial potassium nitrate in distilled water, heating the solution on an electric stove at 85 DEG C to dissolve the industrial potassium nitrate, adding potassium carbonate and heating the solution to 110 DEG C to generate precipitate with continuous stirring, allowing the solution to stand for 2 h and filtering the solution to obtain a solution A; 2) re-crystallization to prepare the guaranteed-reagent potassium nitrate: concentrating the solution A obtained in the step 1) at 170 DEG C to separate crystal out, cooling and spin-drying the crystal, performing re-crystallization, spin-drying the crystal, and drying the crystal in an electric dry oven at 75 DEG C for 5 h to obtain the guaranteed-reagent potassium nitrate. In the method, the guaranteed-reagent potassium nitrate is dissolved in hot water to form a solution which is then boiled with addition of the potassium carbonate to remove the iron impurity. The solution is then cooled and filtered, and finally is dried and crystallized to obtain the guaranteed-reagent potassium nitrate.
Description
technical field [0001] The invention belongs to the preparation method of inorganic compounds, in particular to a preparation method of high-grade pure potassium nitrate. Background technique [0002] High-grade pure potassium nitrate is widely used in the pharmaceutical industry to produce penicillin, potassium salt, and displays in the electronic industry. The current synthesis method of potassium is the metathesis method, in which sodium nitrate and potassium chloride undergo a metathesis reaction to obtain potassium nitrate. The potassium nitrate produced in this way has low purity, high impurity content and complex process steps, which cannot meet the needs of electronics and pharmaceutical industries. Contents of the invention [0003] The purpose of the invention is to overcome the weak points in the prior art, and a kind of impurity content is low, and the preparation method of the high grade pure potassium nitrate of purity is provided. [0004] The purpose techn...
Claims
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