Uses of Potassium thiosulfate

Potassium thiosulfate is a colorless orthorhombic crystal, soluble in water, decomposed into potassium sulfide and potassium sulfate when heated, and liberates sulfur dioxide and sulfur when exposed to acid. Its hemihydrate is a colorless monoclinic Chemicalbook series crystal, which is easily deliquescent, with a relative density of 2.590, easily soluble in water but insoluble in ethanol. It loses crystal water at 200°C and decomposes when heating continues. All are reductive.
Potassium thiosulfate is an effective nitrification inhibitor used in the cultivation and production of crops as sulfur and potash fertilizers, soils, and can also be used as a photographic fixer, metal cleaner, electroplating solution for silver plating, and deodorization of cotton fabrics after bleaching. Chlorine agents and printing and dyeing auxiliaries can also be used as organic synthesis and analysis reagents.

Preparation of potassium thiosulfate

1) Prepare potassium bisulfite solution: pour 1500KG of potassium hydroxide solution with a mass percentage concentration of 45% into the batching tank A, add water to 1500 liters, turn on the stirring and cooling operations, and press the molar ratio of potassium hydroxide to sulfur dioxide as 1: In the ratio of 1.00, 812 kg of sulfur dioxide with a percentage content of 95% is passed into the potassium hydroxide solution to generate a high-concentration potassium bisulfite solution. The reaction temperature is controlled at 60°C. The completed reaction solution is called A solution and is ready for use. ; The cooling operation in this step is realized by jacket cooling water.
2) Preparation of potassium polysulfide alkali solution: 1500 kg potassium hydroxide solution with a mass percentage concentration of 45% is poured into the batching tank B, and the stirring and cooling operations are turned on. The molar ratio of the total feed amount of potassium hydroxide to the sulfur is 1:0.500, add 428.5 kg of sulfur with a mass percentage of 90% to the potassium hydroxide solution, keep it at 80°C until the sulfur is completely dissolved, and obtain a potassium polysulfide solution. The completed reaction solution is called solution B and is ready for use; , The total amount of feed refers to the total amount of potassium hydroxide added in step 1) and this step; the cooling operation in this step is realized by jacket cooling water.
3) Under agitation, pour the solution A in the batching tank A into the batching tank B and mix it with the solution B, and react to form a potassium thiosulfate solution; then further pass sulfur dioxide to adjust the pH to 7.5, which is the end of the reaction; The reaction temperature is controlled at 80°C. After the reaction reached the endpoint, the solution was sampled and analyzed to determine that its potassium thiosulfate mass percentage content was 51.64%.

Application of potassium thiosulfate

Potassium thiosulfate can be used in leather tanning, paper, and textile manufacturing, flue gas desulfurization, cement additives, dechlorination, ozone, and hydrogen peroxide quenching , paint stabilizer, as agricultural fertilizer, as leaching in mining, etc.
Application 1. CN201510932519.8 provides an environmentally friendly formaldehyde detection agent and preparation method. Its main preparation components include potassium thiosulfate, sodium chloride, ferrous nitrate, acetic acid, amine compounds, activated carbon, ammonium molybdate, strong acid, and sulfur. Amidophenylacetic acid, sodium acetate, hydroxymethyl cyanoethane, the balance of deionized water, potassium thiosulfate, sodium chloride, acetic acid, strong acid, amine compounds, ferrous nitrate, ammonium molybdate, etc. according to the mass number Mix the mixture uniformly to obtain mixture A. Mix the activated carbon, sulfonamide phenylacetic acid, sodium acetate, and hydroxymethyl cyanoethane according to the mass ratio to obtain mixture B. Add mixture B to mixture A dropwise and stir evenly, That's it. The preparation method of the formaldehyde detection reagent is simple, the raw materials are easily obtained, and the use is convenient and labor-saving. At the same time, the reagent after use can be recycled and practical after a little processing.
Application 2. CN201710873463.2 discloses a heavy metal cadmium slow-release passivator for paddy soil and a method of use thereof and belongs to the field of soil heavy metal pollution control. A slow-release passivation agent for heavy metal cadmium in paddy soil, comprising the following components by mass: 10-15 parts of quicklime, 8-20 parts of organic fertilizer, 80-125 parts of humic acid, 0.25-0.5 parts of potassium thiosulfate, 40-60 parts of bentonite; the method of use is: apply calcium oxide and organic fertilizer to the acid-contaminated soil, adjust the soil pH to 7.0-8.0 for 7-10 days, and then add humic acid and sulfur to the soil Potassium sulfate and bentonite can be used for 1-2 days to plant crops. The heavy metal cadmium slow-release passivation agent of the present invention has high passivation efficiency, long-lasting and stable slow-release passivation effect, and has the function of improving and enhancing soil fertility efficiency without causing secondary pollution. The materials used are low in cost, safe and reliable, and have good properties. Social and environmental benefits.