Potassium thiosulfate is used as sulfur fertilizer and potassium fertilizer in crop planting and production, soil effective nitrification inhibitor, can also be used as photographic fixing agent, metal cleaner, electroplating solution of silver plating, cotton fabric after bleaching dechlorination agent and printing and dyeing assistant, but also as organic synthesis and analysis reagent.
Preparation:
The invention relates to a preparation method of potassium thiosulfate, which adopts the following steps:
1) Preparation of potassium bisulfite solution: put A 1500KG mass percentage concentration of 45% potassium hydroxide solution into A batching tank, add water to 1500 liters, start stirring and cooling operation, according to the molar ratio of potassium hydroxide and sulfur dioxide is 1: At A ratio of 1.00, 812 kilograms of sulfur dioxide with A percentage content of 95% was passed into the potassium hydroxide solution to generate A high-concentration potassium bisulfite solution. The reaction temperature was controlled at 60℃, and the reaction finished liquid was called A solution, to be used; The cooling operation in this step is achieved by jacket cooling water.
2) Preparation of potassium polysulfide alkaline solution: The 1500㎏ mass percentage concentration of 45% potassium hydroxide solution into the B batchingtank, open the stirring and cooling operation, according to the total amount of potassium hydroxide and sulfur molar ratio of 1:0.5, to potassium hydroxide solution to add the mass percentage content of 90% sulfur 428.5 kg, heat preservation 80℃ to all dissolved sulfur, Potassium polysulfide alkali solution was obtained, and the reaction completion solution was called B solution, which was to be used; Wherein, the total feed amount refers to step 1) and the total amount of potassium hydroxide added in this step; The cooling operation in this step is achieved by jacket cooling water.
3) In the stirred state, A solution from A batching tank is poured into B batching tank to mix with B solution, and the reaction generates potassium thiosulfate solution; The PH of the sulfur dioxide fine-tuning joint was further introduced to 7.5, which was the reaction endpoint; The reaction temperature is controlled at 80℃. After the reaction to the end point, the solution was sampled and analyzed, and the mass percentage of potassium thiosulfate was 51.64%.
Application:
Potassium thiosulfate is used in leather tanning, paper and textile manufacturing, flue gas desulfurization, cement additive, quenching of chlorine, ozone and hydrogen peroxide, paint stabilizer, agricultural fertilizer, leaching agent in mining, etc.
Application CN201510932519.8 to provide a kind of environmental protection formaldehyde detection agent and the preparation method, its main composition of preparation of potassium sulfate sulfur generation, sodium chloride, ferrous nitrate, acetic acid, amine compound, activated carbon, ammonium molybdate, strong acid, sulfonamide phenylacetic acid, sodium acetate, hydroxymethyl cyano ethane, deionized water margin, the sulfur generation of potassium sulfate, sodium chloride, acetic acid, Ferrous acid, amine compounds, nitrate, ammonium molybdate, etc according to the mass number of mixing ratio, get A, the mixture will be activated carbon, sulfonamide phenylacetic acid, sodium acetate, according to the quality than mixing hydroxymethyl cyano ethane, get mixture B, chase the mixture B drop join A of the mixture, stir well, for A quick. The preparation method of formaldehyde detection reagent is simple, the raw material is easy to obtain, and the use is convenient and convenient.
Application ii: CN201710873463.2 disclosed a slow release cadmium passivator for heavy metal in rice soil and its application method, which belongs to the field of soil heavy metal pollution control. The invention relates to a slow release passivation agent for heavy metal cadmium in rice soil, consisting of 10 to 15 parts of quicklime, 8 to 20 parts of organic fertilizer, 80 to 125 parts of humic acid, 0.25 to 0.5 parts of potassium thionate, 40 to 60 parts of bentonite; The use method is as follows: apply calcium oxide and organic fertilizer to acidic contaminated soil, adjust the soil pH to 7.0 ~ 8.0, action time 7 ~ 10 days, and then add humic acid, potassium thiosulfate and bentonite to the soil, action 1 ~ 2 days can be planted crops. The heavy-metal cadmium slow-release passivating agent of the invention has high passivating efficiency, lasting and stable slow-release passivating effect, and has the effect of improving and enhancing soil fertility effect, without causing secondary pollution. The materials used are cheap, safe and reliable, and have good social and environmental benefits.