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Preparation method of potassium thiosulfate

A technology of potassium thiosulfate and potassium bisulfite, applied in the direction of thiosulfate/dithionite/polythionite, etc., which can solve the problems of long reaction time, long production cycle, and unstable finished products. To achieve the effect of shortening the reaction time, reducing equipment investment, and simple production and operation

Active Publication Date: 2020-07-24
淄博长城化工厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solution needs to be heated to boiling to react, and the reaction time needs to be 8 to 12 hours; in order to reduce the surface tension of water and increase the chance of contact between the material and sulfur, it is necessary to add ethanol to treat sulfur to reduce its surface tension; this method requires energy. Heating, and the reaction time is long, and the sulfur must be treated with ethanol, the conversion rate of potassium sulfite is low, and sulfur slag will be generated during the production process
Be again the oxidation method of potassium polysulfide alkali solution, adopt air oxidation to need reaction too long, energy consumption is big, production cycle is long, and finished product is unstable; And adopt pure oxygen method to need to build oxygen-making facility, investment is big, existence facility safety and Production safety problem, production operation is not easy to control, will make the generated thiosulfate easily oxidized to generate dithionate, trithionate, tetrathionate and sulfate impurities, and the quality of the finished product is also unstable

Method used

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  • Preparation method of potassium thiosulfate
  • Preparation method of potassium thiosulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 shown.

[0032] A kind of preparation method of potassium thiosulfate adopts the following steps:

[0033] 1) Preparation of potassium bisulfite solution: put 1500 kg of potassium hydroxide solution with a mass percentage concentration of 45% into the A batching tank, add water to 1500 liters, start stirring and cooling operations, and the molar ratio of potassium hydroxide to sulfur dioxide is 1:1.00 ratio, feed 812 kilograms of sulfur dioxide with a percentage content of 95% into the potassium hydroxide solution to generate a high-concentration potassium bisulfite solution, control the reaction temperature at 60°C, and the reaction completion solution is called A solution. Use; the cooling operation of this step is realized by jacket cooling water. The reaction formula KOH+SO involved in this step 2 =KHSO 3 ;

[0034] 2) Preparation of potassium polysulfide alkali solution: 1500 kg of potassium hydroxide solution with a mass percentage concentrat...

Embodiment 2

[0046] The preparation method of potassium thiosulfate as described in embodiment 1, the difference is,

[0047] In step 1), the mass percent concentration of potassium hydroxide solution is 48%, and it is put into the batching tank of A, and the molar ratio of potassium hydroxide to sulfur dioxide is 1:1.02;

[0048] In step 2), the mass percent concentration of the potassium hydroxide solution is 48%, the total feed amount of potassium hydroxide and the molar ratio of sulfur are 1:0.502, and adding mass percent content to the potassium hydroxide solution is 95% sulfur 433 kg, heat at 90°C until all the sulfur is dissolved;

[0049] In step 3), dilute potassium hydroxide solution is further added to fine-tune the pH to 6.5, which is the end point of the reaction; the reaction temperature is controlled at 90°C.

[0050] After the reaction reached the end point, the solution was sampled and analyzed for determination, and the mass percent content of potassium thiosulfate was 5...

Embodiment 3

[0052] The preparation method of potassium thiosulfate as described in embodiment 1, the difference is,

[0053] In step 1), the molar ratio of potassium hydroxide to sulfur dioxide is 1:1.04, 795 kg of sulfur dioxide with a percentage content of 99% is introduced into the potassium hydroxide solution, and the reaction temperature is controlled at 80° C.;

[0054] In step 2), the total feed amount of potassium hydroxide and the molar ratio of sulfur are 1:0.503, adding 392 kilograms of sulfur with a mass percentage content of 99% to the potassium hydroxide solution, and keeping the temperature at 100 ° C until the sulfur is completely dissolved;

[0055] In step 3), dilute potassium hydroxide solution is further added to finely adjust the pH to 8, which is the end point of the reaction; the reaction temperature is controlled at 100°C.

[0056] After the reaction reached the end point, the solution was sampled and analyzed for determination, and the mass percent content of pota...

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Abstract

The invention discloses a preparation method of potassium thiosulfate. A potassium hydrogen sulfite solution and a potassium polysulfide alkali solution are subjected to a two-liquid phase-to-phase mixing reaction, then a sulfur dioxide or dilute potassium hydroxide solution is used for finely adjusting the PH value, and a potassium thiosulfate finished product with stable quality is obtained; compared with a traditional potassium sulfite method, external heating is not needed in the production process, reaction is conducted through reaction heat of the method, a large amount of energy can besaved, equipment investment is reduced, production operation is simple, production efficiency is improved, and production safety is improved. Certain economic benefits and social benefits are realized.

Description

technical field [0001] The invention relates to a preparation method of potassium thiosulfate, which belongs to the technical field of chemical technology. Background technique [0002] Potassium thiosulfate is an effective nitrification inhibitor used as sulfur fertilizer and potassium fertilizer in crop planting and production, and can also be used as a photographic fixer, metal cleaner, silver-plated electroplating solution, and bleaching agent for cotton fabrics after bleaching. Chlorine and printing and dyeing auxiliaries can also be used as organic synthesis and analysis reagents. [0003] Existing methods for preparing potassium thiosulfate: the first is the potassium sulfite method, which is obtained by adding sulfur powder into potassium sulfite solution and heating to react. The solution needs to be heated to boiling to react, and the reaction time needs to be 8 to 12 hours; in order to reduce the surface tension of water and increase the chance of contact between...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/64
CPCC01B17/64
Inventor 徐德良孙军马忠堂何国勇
Owner 淄博长城化工厂
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