Preparation method of high-purity low-nitrogen potassium persulfate
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A kind of potassium persulfate, high-purity technology, applied in the direction of peroxyhydrate/peroxyacid etc.
Inactive Publication Date: 2015-11-04
TIANJIN GUANGFU TECH DEV
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[0004] In view of this, the main purpose of the present invention is to provide a kind of preparation method of high-purity low-nitrogen potassium persulfate, which can solve the inability of existing reagent grade potassium persulfate The oxidant used for measuring total nitrogen, but the production capacity of the existing potassium persulfate preparation method is low
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specific Embodiment approach 1
[0020] Specific embodiment one: the preparation method of a kind of high-purity low-nitrogen potassium persulfate described in this embodiment is realized through the following steps:
[0021] Step 1. Add 15L of distilled water into the pressure vessel and heat it to 50°C;
[0022] Step 2, add potassium persulfate 2.5 ~ 3Kg and distilled water in the pressure vessel to form a mixed solution;
[0023] Step 3, installing a stirring device and a decompression device in the pressure vessel;
[0024] Step 4, open stirring device, make the mixed solution in the pressure vessel carry out vacuum distillation under stirring state;
[0025] Step 5. Stop heating when 1~2L of water is distilled in the pressure vessel;
[0026] Step 6, pour the remaining mixed solution in the pressure vessel in the step 5 into the crystallization tank, and cool the crystallization tank with ice water outside the crystallization tank;
[0027] Step 7. Filter the crystals in the crystallization tank, and ...
specific Embodiment approach 2
[0031] Specific embodiment two: in the step 4 of the preparation method of a kind of high-purity low-nitrogen potassium persulfate described in this embodiment, the stirring speed of stirring device is 100-150 rev / min, and pressure is 10~20mmHg, and the temperature in pressure tank 40~50℃. Other components and connections are the same as those in the first embodiment.
specific Embodiment approach 3
[0032] Embodiment 3: The drying temperature in the drying oven in step 10 of a method for preparing high-purity low-nitrogen potassium persulfate described in this embodiment is 60°C. Other components and connections are the same as those in the first embodiment.
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Abstract
The invention relates to a preparation method of low-nitrogen potassium persulfate and in particular relates to a preparation method of high-purity low-nitrogen potassium persulfate, aiming to solve the problems that existing regent grade potassium persulfate can not be used as an oxidizing agent for measuring total nitrogen and the capacities in existing potassium persulfate preparation methods are lower. The preparation method comprises the following steps: adding 15L of distilled water to a pressure vessel and adding 2.5-3Kg of potassium persulfate to the pressure vessel to form a mixed solution with the distilled water; filtering a crystal substance in a crystallizing tank, pouring the washed crystal substance into a dissolving tank, adding 6-7L of distilled water and heating the materials to 50-60 DEG C; carrying out reduced pressure distillation on a dissolving solution in the dissolving tank; spin-drying the crystal substance, washing the crystal substance with ice water twice to three times, washing the crystal substance with ethanol once, finally spin-drying the crystal substance and drying the crystal substance in a vacuum drying oven, thus obtaining high-purity low-nitrogen potassium persulfate. The preparation method is used in the field of chemical reagents.
Description
technical field [0001] The invention relates to a preparation method of low-nitrogen potassium persulfate, in particular to a preparation method of high-purity low-nitrogen potassium persulfate, and belongs to the field of chemical reagents. Background technique [0002] Potassium persulfate is a white crystalline inorganic compound, odorless, deliquescent, combustion-supporting, and irritating. It is mainly used in bleaching agents, strong oxidants, photographic medicines, analytical reagents, and polymerization accelerators. It is an alkali The key reagent for the determination of total nitrogen by potassium persulfate digestion ultraviolet spectrophotometry. Total nitrogen refers to the total nitrogen content of nitrogen compounds contained in water bodies, and is an important indicator reflecting the degree of pollution and eutrophication of water bodies. Domestic sewage, solution drainage, and industrial wastewater are directly discharged into the water body, which in...
Claims
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