Hydrogen chloride treatment device in production of potassium sulfate by Mannheim method

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a hydrogen chloride treatment device in Mannheim process potassium sulfate production, which comprises a reaction furnace, and a gas outlet of the reaction furnace is sequentially communicated with a cooler, a washing tower group, a demister, a primary absorption tower group, a secondary absorption tower group, a tail gas recovery system and a chimney through pipelines and valves, the washing tower group is also communicated with a cooler and a B acid storage tank through pipelines, the primary absorption tower group is communicated with an A acid storage tank through a pipeline, and the washing tower group, the primary absorption tower group, the secondary absorption tower group and the tail gas recovery system are respectively communicated with a high-level hydrochloric acid tank through pipelines; a gas-collecting hood is arranged at a solid material outlet of the reaction furnace and is sequentially communicated to a filler washing system and a chimney through a pipeline and a fan. The device is simple in structure, energy-saving and environment-friendly, can obtain the byproduct high-concentration hydrochloric acid, and is environment-friendly.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a hydrogen chloride treatment device in the production of potassium sulfate using the Mannheim process. Background Technology

[0002] The Mannheim process for producing potassium sulfate is currently the most widely used technology. The Mannheim process is mature and reliable, and its production capacity can be adjusted according to actual demand. During the Mannheim process, potassium sulfate and hydrogen chloride are simultaneously produced as a byproduct. Hydrogen chloride, as a byproduct, can be used to prepare materials such as dichloroethane, hydrochloric acid, and chlorosulfonic acid.

[0003] The Mannheim process generates hydrogen chloride gas from two processes: first, the hydrogen chloride produced in the Mannheim furnace reaction chamber (containing a small amount of sulfuric acid mist); and second, the tail gas generated during the scrubbing and cleaning of the furnace. Specifically, when the furnace door is opened to clean the stirring teeth, hydrogen chloride gas overflows from the furnace door, is collected, and then scrubbed, resulting in residual tail gas. If these two portions of hydrogen chloride are not effectively recovered and utilized, it will lead to waste and environmental impact. Current technology only treats the hydrogen chloride produced in the Mannheim furnace reaction chamber, neglecting the treatment of the overflow from the scrubbing process, thus resulting in hydrogen chloride waste and environmental pollution. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a hydrogen chloride treatment device in the production of potassium sulfate in the Mannheim process, which treats the hydrogen chloride generated in the production process of the Mannheim process separately and then reuses it. The device has a simple structure, is energy-saving and environmentally friendly, and produces high-concentration hydrochloric acid as a by-product while ensuring environmental safety.

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

[0006] A hydrogen chloride treatment device for potassium sulfate production using the Mannheim process includes a reactor. The gas outlet of the reactor is connected in sequence via pipes and valves to a cooler, a scrubbing tower group, a demister, a primary absorption tower group, a secondary absorption tower group, a tail gas recovery system, and a chimney. The scrubbing tower group is also connected via pipes to the cooler and a Brønsted acid storage tank. The primary absorption tower group is connected via pipes to an Acønsted acid storage tank. The scrubbing tower group, the primary absorption tower group, the secondary absorption tower group, and the tail gas recovery system are each connected via pipes to a high-level hydrochloric acid tank. The solid material outlet of the reactor is equipped with a gas collection hood, which is connected in sequence via pipes and a fan to a packing washing system and a chimney.

[0007] Preferably, the cooler is a graphite cooler.

[0008] Preferably, the washing tower group includes a first sulfuric acid washing tower and a second sulfuric acid washing tower. The lower outlet of the first sulfuric acid washing tower is connected to a B acid storage tank via a pipeline, and also to a cooler via a pipeline (to flush the conveying pipeline inside the cooler to prevent dust blockage).

[0009] Preferably, the primary absorption tower group comprises three falling film absorption towers arranged in parallel, namely a first falling film absorption tower, a second falling film absorption tower, and a third falling film absorption tower. The outlet of the first falling film absorption tower is connected to the tartrate storage tank via a pipeline.

[0010] Preferably, the secondary absorption tower group includes two falling film absorption towers arranged in parallel, namely the fourth falling film absorption tower and the fifth falling film absorption tower.

[0011] Furthermore, the fifth falling film absorption tower is equipped with a gas-liquid separator at its top. Unabsorbed hydrochloric acid enters the tail gas recovery system after passing through the gas-liquid separator.

[0012] Preferably, the exhaust gas recovery system includes four exhaust gas recovery towers arranged in parallel, namely a first exhaust gas recovery tower, a second exhaust gas recovery tower, a third exhaust gas recovery tower, and a fourth exhaust gas recovery tower.

[0013] Preferably, the packed washing system includes four packed washing towers arranged in parallel, namely a first packed washing tower, a second packed washing tower, a third packed washing tower, and a fourth packed washing tower. The packing material is Pall rings.

[0014] Preferably, the outlet of the packing washing system is connected to the Brønsted acid storage tank via a pipeline.

[0015] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] 1. This utility model uses a cooler, a scrubbing tower group, a demister, a primary absorption tower group, a secondary absorption tower group, a tail gas recovery system, and a chimney to treat the impurity-containing hydrogen chloride gas generated during the reaction in the reactor to obtain Brønsted acid and Acid respectively. The treated tail gas is then discharged. The obtained Brønsted acid and Acid can be sold to increase profits, and the tail gas meets emission standards to ensure environmental safety.

[0017] 2. This utility model collects and treats the hydrogen chloride gas that overflows during the scratching of the reactor through a gas collection hood, a fan and a packing washing system. The treated gas emissions ensure environmental safety, and the hydrochloric acid obtained is mixed with Brønsted acid and sold together to increase profits.

[0018] In summary, this invention has a simple structure, is energy-saving and environmentally friendly, and produces high-concentration hydrochloric acid as a byproduct while ensuring environmental safety. 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 equipment process according to an embodiment of the present utility model;

[0021] The components include: 1. Reactor; 2. Cooler; 3. Scrubbing tower group; 4. Demister; 5. Primary absorption tower group; 6. Secondary absorption tower group; 7. Tail gas recovery system; 8. Chimney; 9. B acid storage tank; 10. A acid storage tank; 11. High-level hydrochloric acid tank; 12. Gas collection hood; 13. Fan; and 14. Packing washing system. Detailed Implementation

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

[0023] like Figure 1 As shown, this utility model is a hydrogen chloride treatment device in the production of potassium sulfate using the Mannheim process. It includes a reactor 1. The gas outlet of the reactor 1 is connected in sequence to a cooler 2, a scrubbing tower group 3, a demister 4, a primary absorption tower group 5, a secondary absorption tower group 6, a tail gas recovery system 7, and a chimney 8 via pipes (not shown) and valves (not shown). The scrubbing tower group 3 is also connected to the cooler 2 and a β-acid storage tank 9 via pipes. The primary absorption tower group 5 is connected to an α-acid storage tank 10 via pipes. The scrubbing tower group 3, the primary absorption tower group 5, the secondary absorption tower group 6, and the tail gas recovery system 7 are respectively connected to a high-level hydrochloric acid tank 11 via pipes. The solid material outlet of the reactor 1 is equipped with a gas collection hood 12. The gas collection hood 12 is connected in sequence to a packing washing system 14 and a chimney 8 via pipes and a fan 13.

[0024] Scrubbing tower group 3 includes a first sulfuric acid scrubbing tower (not labeled) and a second sulfuric acid scrubbing tower (not labeled). The lower outlet of the first sulfuric acid scrubbing tower is connected to the B acid storage tank 9 via a pipeline. Primary absorption tower group 5 includes three falling film absorption towers arranged in parallel: a first falling film absorption tower (not labeled), a second falling film absorption tower (not labeled), and a third falling film absorption tower (not labeled). The outlet of the first falling film absorption tower is connected to the A acid storage tank 10 via a pipeline.

[0025] In practical applications, the gas generated by reactor 1 is first cooled by cooler 2 and then sequentially enters the first and second sulfuric acid scrubbing towers in scrubbing tower group 3. The absorbent in the second sulfuric acid scrubbing tower in scrubbing tower group 3 comes from the high-level hydrochloric acid tank 11. After absorbing sulfur trioxide, material particles, and hydrochloric acid in the tail gas, it enters the first sulfuric acid scrubbing tower for further absorption. Part of the resulting Brønsted acid (hydrochloric acid with a high sulfate ion content) is sent to cooler 2 for flushing the pipes (to prevent dust from clogging the pipes), and the other part is collected in Brønsted acid storage tank 9. The tail gas after being treated by scrubbing tower group 3 first enters demister 4 to separate the liquid droplets in the tail gas, and then the tail gas is sent to the first-stage absorption tower group 5. The gas sequentially enters the first falling film absorption tower, the second falling film absorption tower, and the third falling film absorption tower. The absorbent from the high-level hydrochloric acid tank 11 sequentially flows from the third falling film absorption tower to the first falling film absorption tower. After three stages of absorption, the collected liquid yields A acid (hydrochloric acid with low sulfate ion content), which is then transported from the outlet of the first falling film absorption tower to the A acid storage tank 10. The tail gas treated by the first-stage absorption tower group 5 is transported to the second-stage absorption tower group 6. The gas then sequentially enters the fourth and fifth falling film absorption towers. After being separated by the gas-liquid separator at the top of the fifth falling film absorption tower (the liquid flows out of the fourth falling film absorption tower and enters the tail gas recovery system 7), it enters the tail gas recovery system 7. After being absorbed by the fourth-stage tail gas recovery tower, it is discharged into the chimney 8. The absorbent from the high-level hydrochloric acid tank 11 enters from the fifth falling film absorption tower, flows out of the fourth falling film absorption tower, and enters the fourth tail gas recovery tower in the tail gas recovery system 7. It is then conveyed forward to absorb the hydrochloric acid in the tail gas. Finally, it is transported to the high-level hydrochloric acid tank 11 through the outlet of the first tail gas recovery tower to provide absorbent for the previous process.

[0026] When the furnace door of reactor 1 is opened to clean the stirring teeth, the hydrogen chloride gas overflowing from the furnace door is collected by the gas collection hood 12 and the blower 13 and then transported to the packing washing system 14 for treatment. The generated tail gas is discharged through the chimney 8, and the generated liquid is transported through the pipeline to the B acid storage tank 9 for temporary storage.

[0027] Through the above treatment, hydrogen chloride in the production process can be effectively recovered and utilized, improving economic efficiency and ensuring environmental safety.

[0028] 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 hydrogen chloride treatment device for potassium sulfate production using the Mannheim process, characterized in that: The reactor includes a gas outlet connected in sequence via pipes and valves to a cooler, a scrubbing tower group, a demister, a primary absorption tower group, a secondary absorption tower group, a tail gas recovery system, and a chimney. The scrubbing tower group is also connected via pipes to the cooler and a β-acid storage tank. The primary absorption tower group is connected via pipes to an α-acid storage tank. The scrubbing tower group, the primary absorption tower group, the secondary absorption tower group, and the tail gas recovery system are each connected via pipes to a high-level hydrochloric acid tank. The solid material outlet of the reactor is equipped with a gas collection hood, which is connected in sequence via pipes and a fan to a packing washing system and a chimney.

2. The hydrogen chloride treatment device in the Mannheim process potassium sulfate production as described in claim 1, characterized in that: The cooler is a graphite cooler.

3. The hydrogen chloride treatment device in the Mannheim process potassium sulfate production as described in claim 1, characterized in that: The washing tower group includes a first sulfuric acid washing tower and a second sulfuric acid washing tower; the lower outlet of the first sulfuric acid washing tower is connected to the B acid storage tank and also connected to the cooler through a pipeline.

4. The hydrogen chloride treatment device in the Mannheim process potassium sulfate production as described in claim 1, characterized in that: The primary absorption tower group includes three falling film absorption towers arranged in parallel, namely the first falling film absorption tower, the second falling film absorption tower, and the third falling film absorption tower.

5. The hydrogen chloride treatment device in the Mannheim process potassium sulfate production as described in claim 1, characterized in that: The secondary absorption tower group includes two falling film absorption towers connected in parallel, namely the fourth falling film absorption tower and the fifth falling film absorption tower; The fifth falling film absorption tower is equipped with a gas-liquid separator at the top.

6. The hydrogen chloride treatment device in the Mannheim process potassium sulfate production as described in claim 1, characterized in that: The exhaust gas recovery system includes four exhaust gas recovery towers connected in parallel, namely the first exhaust gas recovery tower, the second exhaust gas recovery tower, the third exhaust gas recovery tower, and the fourth exhaust gas recovery tower.

7. The hydrogen chloride treatment device in the Mannheim process potassium sulfate production as described in claim 1, characterized in that: The packing washing system includes four packing washing towers arranged in parallel, namely the first packing washing tower, the second packing washing tower, the third packing washing tower, and the fourth packing washing tower.

8. The hydrogen chloride treatment device in the Mannheim process potassium sulfate production as described in claim 1, characterized in that: The outlet of the packing washing system is connected to the B acid storage tank via a pipeline.

Images