A treatment device for hydrogen chloride by-product in production of potassium sulfate by manheim method

Abstract

The utility model belongs to chemical equipment technical field discloses a kind of processing device of potassium sulfate by-product hydrogen chloride of mannheim method production, including mannheim furnace, and the acid gas export of mannheim furnace is sequentially communicated to graphite falling film absorber, acid mist trap, mixed acid washing tower and hydrochloric acid absorption system by pipeline, valve, and hydrochloric acid absorption system includes sequentially communicated first-stage absorption tower, secondary absorption tower and hydrochloric acid storage tank;Hydrochloric acid storage tank is sequentially communicated to limestone reactor, three-effect evaporation system, granulation drying system by pipeline, pump and valve;The gas export of limestone reactor is sequentially communicated to carbonization tower, thickener, centrifugal drying system by pipeline and valve.The utility model can recycle and utilize hydrogen chloride generated in production process, and simultaneously co-production calcium chloride and sodium bicarbonate, and processing effect is good, and economic value is high.

Description

Technical Field

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

[0002] Potassium sulfate is an inorganic salt, typically containing 50%–52% potassium (K) and approximately 18% sulfur (S). It has wide applications in the pharmaceutical, chemical, and food industries. Currently, potassium sulfate is mostly produced using the Mannheim process, which involves reacting potassium chloride and sulfuric acid in a Mannheim furnace to produce potassium sulfate and high-temperature hydrogen chloride gas. This gas is produced in large quantities and has high acidity, requiring its recovery. However, the concentrated hydrochloric acid recovered using conventional methods contains impurities, has a small market, and commands a low selling price, thus severely impacting the economic benefits of enterprises. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a treatment device for hydrogen chloride, a byproduct of potassium sulfate production in the Mannheim process, which recovers and utilizes the hydrogen chloride generated during the production process, and simultaneously produces calcium chloride and sodium bicarbonate. The device has good treatment effect and high economic value.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A treatment device for hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process, includes a Mannheim furnace. The acid gas outlet of the Mannheim furnace is sequentially connected via pipes and valves to a graphite falling film absorber, an acid mist collector, a mixed acid scrubbing tower, and a hydrochloric acid absorption system (the outlet of the former is connected to the inlet of the latter via pipes and valves). The hydrochloric acid absorption system includes a primary absorption tower, a secondary absorption tower, and a hydrochloric acid storage tank sequentially connected via pipes and valves (the outlet of the former is connected to the inlet of the latter via pipes and valves). The hydrochloric acid storage tank is sequentially connected via pipes, pumps, and valves to a limestone reactor, a triple-effect evaporator, and a granulation drying system (the outlet of the former is connected to the inlet of the latter via pipes and valves). The gas outlet of the limestone reactor is sequentially connected via pipes and valves to a carbonization tower, a thickener, and a centrifugal drying system (the outlet of the former is connected to the inlet of the latter via pipes and valves). The tail gas outlets of the mixed acid scrubbing tower, the primary absorption tower, the secondary absorption tower, the granulation drying system, and the carbonization tower are all connected via pipes to a tail gas treatment device.

[0006] Preferably, the pipeline between the graphite falling film absorber and the Mannheim furnace is a stainless steel tube heat exchanger. The graphite falling film absorber is model GX-300, manufactured by Nantong Xingqiu Graphite Equipment Co., Ltd.; the stainless steel tube heat exchanger is model BLQ-200, manufactured by Lanzhou Lanshi Heat Exchange Equipment Co., Ltd.

[0007] Preferably, the primary absorption tower is model XST-3000 and the secondary absorption tower is model XST-2500, both manufactured by Wuxi Xuelang Chemical Packing Co., Ltd.; the hydrochloric acid storage tank is model HC-50, manufactured by Jiangsu Yangyang Chemical Equipment Manufacturing Co., Ltd.

[0008] Preferably, the limestone reactor is an enamel-lined reactor, equipped with a limestone inlet connected to a limestone supply device via a pipeline. The model is KCF-5000L, manufactured by Zibo Taiji Industrial Enamel Co., Ltd.

[0009] Preferably, in the triple-effect evaporation system, the first-effect evaporator is an MVR evaporator, model MVR-100; the third-effect evaporator is a rising film evaporator, model SFM-50. The triple-effect evaporation system is manufactured by Jiangsu Leke Energy Saving Technology Co., Ltd.

[0010] Preferably, the granulation and drying system is a vibrating fluidized bed dryer, model ZLG-15, manufactured by Changzhou Xianfeng Drying Equipment Co., Ltd.

[0011] Preferably, the carbonation tower is a sieve plate carbonation tower, which is equipped with a sodium carbonate inlet, which is connected to a sodium carbonate supply device via a pipeline. Manufactured by Tianjin Bohai Chemical Machinery Factory.

[0012] Preferably, the thickener is a two-stage thickener, namely a first thickener and a second thickener; the first thickener is a GZN-3000 high-efficiency gravity thickener, manufactured by Jiangsu Saideli Pharmaceutical Machinery Manufacturing Co., Ltd.; the second thickener is a CH-2000 vibratory thickener, manufactured by Changzhou Yibu Drying Equipment Co., Ltd.

[0013] Preferably, the centrifugal drying system consists of a two-stage pusher centrifuge (model HR8000, Xiangtan Centrifuge Co., Ltd.) and a flash dryer (model XSG-12, Changzhou Yibu Drying Equipment Co., Ltd.) connected in sequence.

[0014] Preferably, the exhaust gas treatment device includes an exhaust gas absorption tower and an alkaline scrubbing tower, with the alkaline scrubbing tower connected to a chimney. The exhaust gas absorption tower is model WQ-2000, and the alkaline scrubbing tower is model JXT-1800, both manufactured by Jiangsu Lanchen Environmental Protection Technology Co., Ltd.

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

[0016] This invention utilizes a graphite falling film absorber, an acid mist collector, a mixed acid scrubbing tower, and a hydrochloric acid absorption system to absorb hydrogen chloride gas generated during production, yielding concentrated hydrochloric acid. The concentrated hydrochloric acid then reacts with limestone to produce calcium chloride. The carbon dioxide generated in the reaction then reacts with sodium carbonate to produce sodium bicarbonate. Through these reactions, the hydrogen chloride generated during production can be fully recovered and utilized.

[0017] In summary, this invention recycles and utilizes hydrogen chloride generated during the production process, while simultaneously producing calcium chloride and sodium bicarbonate. It has good treatment effect and high economic value. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0020] The components include: 1. Mannheim furnace; 2. Graphite falling film absorber; 3. Acid mist collector; 4. Mixed acid scrubbing tower; 5. Hydrochloric acid absorption system; 6. Limestone reactor; 7. Triple-effect evaporation system; 8. Granulation and drying system; 9. Carbonization tower; 10. Thickener; and 11. Centrifugal drying system. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, this utility model is a treatment device for hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process. It includes a Mannheim furnace 1. The acid gas outlet of the Mannheim furnace 1 is connected sequentially to a graphite falling film absorber 2, an acid mist collector 3, a mixed acid scrubbing tower 4, and a hydrochloric acid absorption system 5 via pipes (not shown) and valves (not shown). The hydrochloric acid absorption system 5 includes a primary absorption tower (not shown), a secondary absorption tower (not shown), and a hydrochloric acid storage tank (not shown) connected sequentially. The hydrochloric acid storage tank is connected sequentially to a limestone reactor 6, a triple-effect evaporation system 7, and a granulation and drying system 8 via pipes, pumps (not shown), and valves. The gas outlet of the limestone reactor is connected sequentially to a carbonization tower 9, a thickener 10, and a centrifugal drying system 11 via pipes and valves. The tail gas outlets of the mixed acid scrubbing tower 4, the primary absorption tower, the secondary absorption tower, the granulation and drying system 8, and the carbonization tower 9 are all connected to a tail gas treatment device (not shown) via pipes.

[0023] In actual production, the reaction temperature of the Mannheim furnace 1 is 300-450℃, and its outlet gas temperature is the same as the reaction temperature. Therefore, the hydrogen chloride gas produced by the reaction must first be cooled by the graphite falling film absorber 2 before entering the acid mist collector 3, the mixed acid washing tower 4, and the hydrochloric acid absorption system 5 for treatment to obtain concentrated hydrochloric acid with a concentration of 30%. This concentrated hydrochloric acid can be sold on the market or transported to the limestone reactor 6 to react with limestone to produce calcium chloride and carbon dioxide. The mother liquor containing calcium chloride is concentrated by the triple-effect evaporation system 7 and then enters the granulation and drying system 8 for granulation to obtain calcium chloride product. The carbon dioxide gas enters the carbonization tower 9 and reacts with sodium carbonate to produce sodium bicarbonate. The sodium bicarbonate mother liquor is concentrated by the thickener 10 and dried by the centrifugal drying system 11 to obtain sodium bicarbonate product.

[0024] The water vapor generated by the triple-effect evaporation system 7, granulation and drying system 8, and centrifugal drying system 11 is condensed and reused in processes such as hydrochloric acid absorption system 5, Mannheim furnace tail gas scrubbing, sodium carbonate solution preparation, and equipment rinsing, depending on water quality, thus achieving recycling. The tail gas generated throughout the production process is treated in a unified tail gas treatment device before being discharged.

[0025] 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 device for processing hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process, characterized in that: The system includes a Mannheim furnace. The acid gas outlet of the Mannheim furnace is connected sequentially via pipes and valves to a graphite falling film absorber, an acid mist collector, a mixed acid scrubbing tower, and a hydrochloric acid absorption system. The hydrochloric acid absorption system includes a primary absorption tower, a secondary absorption tower, and a hydrochloric acid storage tank connected sequentially. The hydrochloric acid storage tank is connected sequentially via pipes, pumps, and valves to a limestone reactor, a triple-effect evaporation system, and a granulation and drying system. The gas outlet of the limestone reactor is connected sequentially via pipes and valves to a carbonization tower, a thickener, and a centrifugal drying system. The tail gas outlets of the mixed acid scrubbing tower, the primary absorption tower, the secondary absorption tower, the granulation and drying system, and the carbonization tower are all connected via pipes to a tail gas treatment device.

2. The apparatus for treating hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process, as described in claim 1, is characterized in that: The pipeline between the graphite falling film absorber and the Mannheim furnace is a stainless steel tube heat exchanger.

3. The apparatus for treating hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process, as described in claim 1, is characterized in that: The limestone reactor is an enamel-lined reactor.

4. The apparatus for treating hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process, as described in claim 1, is characterized in that: The granulation and drying system is a vibrating fluidized bed dryer.

5. The apparatus for treating hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process, as described in claim 1, is characterized in that: The carbonization tower is a sieve plate carbonization tower.

6. The apparatus for treating hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process, as described in claim 1, is characterized in that: The centrifugal drying system consists of a two-stage pusher centrifuge and a flash dryer connected in sequence.

7. The apparatus for treating hydrogen chloride, a byproduct of potassium sulfate production via the Mannheim process, as described in claim 1, is characterized in that: The exhaust gas treatment device includes an exhaust gas absorption tower and an alkaline scrubbing tower, with the alkaline scrubbing tower connected to a chimney.

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