Potassium sulfate production device

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a potassium sulfate production device which comprises a reaction kettle, the reaction kettle is provided with a liquid material outlet and a gas outlet, and the liquid material outlet of the reaction kettle is sequentially communicated with a crystallization kettle, a washing kettle, a filter and a drying machine through a pipeline, a pump and a valve; a gas outlet of the reaction kettle is sequentially communicated with the cooler and the absorption tower through pipelines and valves; the absorption tower is provided with an acid outlet and a tail gas outlet, the acid outlet is communicated to the hydrochloric acid storage tank through a pipeline and a valve, and the tail gas outlet is communicated to the washing tower through a pipeline; the washing tower is communicated with the purification tower through a pipeline. The device is simple and reasonable in design, can produce potassium sulfate with high yield and high purity, can better recycle hydrogen chloride, and is suitable for producing potassium sulfate with different scales and different specifications.

Description

Technical Field

[0001] This utility model relates to the field of potassium sulfate production technology, specifically to a potassium sulfate production apparatus. Background Technology

[0002] Potassium sulfate is an inorganic salt with the chemical formula K₂SO₄, and it appears as a white crystalline powder. It has wide applications in various fields, and due to its low hygroscopicity, resistance to clumping, good physical properties, and ease of application, it is used in agriculture as a major raw material for water-soluble potassium fertilizers and chlorine-free nitrogen, phosphorus, and potassium ternary compound fertilizers.

[0003] Currently, potassium sulfate is mainly produced using potassium chloride and sulfuric acid solutions as raw materials, through the Mannheim process under specific conditions. The reactants are then filtered, crystallized, settled, centrifuged, and dried to obtain the final product. However, due to the high temperature and strong acid conditions during the reaction, equipment corrosion is severe, resulting in a short service life and a large initial investment. Furthermore, the production capacity of a single furnace is relatively small, typically around 10,000 tons per year, and the large amount of liquid hydrochloric acid produced as a byproduct causes environmental pollution and creates a sales burden. These shortcomings are difficult to overcome in existing production processes. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a potassium sulfate production device that addresses the shortcomings of the existing technology. The device is simple and reasonable in design, can produce potassium sulfate with high yield and high purity, can effectively recover and utilize hydrogen chloride, and is suitable for potassium sulfate production of different scales and specifications.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A potassium sulfate production apparatus includes a reaction vessel with a liquid outlet and a gas outlet. The liquid outlet of the reaction vessel is connected in sequence to a crystallization vessel, a washing vessel, a filter, and a dryer via pipes, pumps, and valves. The gas outlet of the reaction vessel is connected in sequence to a cooler and an absorption tower via pipes and valves. The absorption tower has an acid outlet and a tail gas outlet. The acid outlet is connected to a hydrochloric acid storage tank via pipes and valves, and the tail gas outlet is connected to a washing tower via pipes. The washing tower is connected to a purification tower via pipes.

[0007] Preferably, the reactor is equipped with a heat exchange device and a stirring device, and also has a solid material inlet and a liquid material inlet. The solid material inlet is connected to a potassium bisulfate storage tank and a potassium chloride storage tank via pipelines, respectively, and the liquid material inlet is connected to a water storage tank via pipelines.

[0008] Preferably, the crystallization vessel is equipped with a heat exchange device and a stirring device.

[0009] Furthermore, the heat exchange device is a jacketed heat exchanger. The heat exchange medium in the jacketed heat exchanger is water.

[0010] Preferably, the filter is a plate and frame filter.

[0011] Preferably, the cooler is a graphite cooler.

[0012] Preferably, the absorption tower is a water absorption tower and is equipped with a water spray device. The water spray device is connected to an external water supply device.

[0013] Preferably, the washing tower is a graphite packed tower.

[0014] Preferably, the purification tower is an alkali purification tower, with an alkali storage tank at its base. An alkali spraying device is also provided. This alkali spraying device is connected to an external alkali supply device.

[0015] Preferably, the purification tower is connected to a chimney to discharge the purified exhaust gas.

[0016] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] This invention uses potassium bisulfate and potassium chloride as raw materials to react and produce potassium sulfate and hydrogen chloride. The reaction temperature is low, so the energy consumption is small. The obtained potassium sulfate has a high yield and high purity. Furthermore, since the generated hydrogen chloride is discharged as a gas and then treated by a recovery device to form hydrochloric acid, it causes less corrosion to the equipment compared to the sulfuric acid residue and hydrochloric acid mixture produced by the Mannheim process, and the recovery process is simple.

[0018] Therefore, this utility model has a simple and reasonable design, can produce potassium sulfate with high yield and high purity, and can effectively recover and utilize hydrogen chloride, making it suitable for potassium sulfate production of different scales and specifications. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0021] In the diagram, 1 is the reaction vessel; 2 is the crystallization vessel; 3 is the washing vessel; 4 is the filter; 5 is the dryer; 6 is the cooler; 7 is the absorption tower; 8 is the hydrochloric acid storage tank; 9 is the washing tower; 10 is the purification tower; and 11 is the chimney. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] like Figure 1As shown, a potassium sulfate production apparatus includes a reactor 1, which has a liquid outlet (not shown) and a gas outlet (not shown). The liquid outlet of the reactor 1 is connected in sequence to a crystallization reactor 2, a washing reactor 3, a filter 4, and a dryer 5 via pipes (not shown), a pump (not shown), and a valve (not shown). The gas outlet of the reactor 1 is connected in sequence to a cooler 6 and an absorption tower 7 via pipes and valves. The absorption tower 7 has an acid outlet (not shown) and a tail gas outlet (not shown). The acid outlet is connected to a hydrochloric acid storage tank 8 via pipes and valves, and the tail gas outlet is connected to a washing tower 9 via pipes. The washing tower 9 is connected to a purification tower 10 via pipes, and the purification tower is connected to a chimney 11 via pipes.

[0025] In actual production, potassium bisulfate is first loaded into reaction vessel 1 and dissolved in an appropriate amount of deionized water. Then, potassium chloride with an equimolar amount of potassium bisulfate is added, and the mixture is heated to 90°C for one hour. The stirring speed during the reaction is 60 r / min. After the reaction is complete, the liquid is transferred to crystallization vessel 2 to cool to room temperature for crystallization. The precipitated potassium sulfate solid is then transferred to washing vessel 3 for washing with saturated potassium sulfate solution, and then transferred to filter 4 for filtration. The filtered crystals are then transferred to dryer 5 and dried at 50°C to obtain potassium sulfate product. The generated hydrogen chloride gas is first cooled by cooler 6 and then transferred to absorption tower 7. It is absorbed by water spray to form hydrochloric acid, which is then stored in hydrochloric acid storage tank 8. The remaining tail gas enters washing tower 9 for further washing with graphite packing, and then enters purification tower 10 for further acid removal with alkaline solution. After washing and purification, the tail gas meets the emission standards and is then discharged through chimney 11.

[0026] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A potassium sulfate production apparatus, characterized in that: The apparatus includes a reaction vessel, which has a liquid outlet and a gas outlet. The liquid outlet of the reaction vessel is connected in sequence to a crystallization vessel, a washing vessel, a filter, and a dryer via pipes, pumps, and valves. The gas outlet of the reaction vessel is connected in sequence to a cooler and an absorption tower via pipes and valves. The absorption tower has an acid outlet and a tail gas outlet. The acid outlet is connected to a hydrochloric acid storage tank via pipes and valves, and the tail gas outlet is connected to a washing tower via pipes. The washing tower is connected to a purification tower via pipes.

2. The potassium sulfate production apparatus according to claim 1, characterized in that: The reactor is equipped with a heat exchange device and a stirring device, as well as a solid material inlet and a liquid material inlet.

3. The potassium sulfate production apparatus according to claim 1, characterized in that: The crystallization vessel is equipped with a heat exchange device and a stirring device.

4. The potassium sulfate production apparatus according to claim 1, characterized in that: The filter is a plate and frame filter.

5. The potassium sulfate production apparatus according to claim 1, characterized in that: The cooler is a graphite cooler.

6. The potassium sulfate production apparatus according to claim 1, characterized in that: The absorption tower is a water absorption tower.

7. The potassium sulfate production apparatus according to claim 1, characterized in that: The washing tower is a graphite packed tower.

8. The potassium sulfate production apparatus according to claim 1, characterized in that: The purification tower is an alkaline solution purification tower.

9. The potassium sulfate production apparatus according to claim 1, characterized in that: The purification tower is connected to a chimney.

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