Method and device for purifying gasified liquid sulfur dioxide

Abstract

The invention relates to the technical field of industrial gas purification, in particular to a method for purifying gasified liquid sulfur dioxide, which comprises the following steps of: introducing gas to be purified after the liquid sulfur dioxide is gasified into water to wash and remove impurities, and then introducing concentrated sulfuric acid to remove moisture to obtain purified sulfur dioxide gas. The invention also relates to a purification device for realizing the method. The two chambers respectively form a primary purification chamber and a secondary purification chamber for sulfur dioxide gas to be treated; the primary purification chamber is filled with water as a washing medium and is used for removing solid particles in gas; the second-stage purification chamber is filled with concentrated sulfuric acid as a drying medium and is used for deeply removing moisture in the gas, and the equipment is simple in structure and high in purification efficiency.

Description

Technical Field

[0001] This invention relates to the field of industrial gas purification technology, specifically to a purification method and apparatus for the vaporization of liquid sulfur dioxide. Background Technology

[0002] Sulfur dioxide is an important chemical raw material widely used in refrigeration, pesticides, papermaking, and fine chemicals. Commercially available sulfur dioxide is usually stored in liquid form in steel cylinders and needs to be vaporized into a gas before use. However, even liquid sulfur dioxide with a purity of up to 99.99% can develop impurities such as trace amounts of metal dust, organic particles, and gaseous moisture during long-term storage and transportation due to factors such as corrosion of the container walls, precipitation of sealing materials, or accumulation of trace moisture. These impurities, after vaporization, enter downstream processes with the gas, potentially leading to a series of problems such as catalyst poisoning, decreased product purity, equipment corrosion, or pipeline blockage.

[0003] Existing gas purification solutions are mostly general-purpose purification towers for crude or exhaust gases. These towers are complex in structure, bulky in size, and unsuitable for direct connection to the vaporizer outlet for purifying high-purity gases. Therefore, there is an urgent need for a compact, highly efficient purification device specifically designed for high-purity sulfur dioxide purification. Summary of the Invention

[0004] The purpose of this invention is to provide a purification method for liquid sulfur dioxide after vaporization, which is simple in process, has good purification effect and high efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a purification method for liquid sulfur dioxide after vaporization, wherein the gas to be purified after vaporization of liquid sulfur dioxide is first passed into water for washing and impurity removal, and then concentrated sulfuric acid is passed into it to remove moisture, thereby obtaining purified sulfur dioxide gas.

[0006] Another objective of this invention is to provide an integrated, miniaturized, safe, and efficient purification device for the vaporization of liquid sulfur dioxide, thereby overcoming the shortcomings of traditional multi-device series purification processes.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a purification device for liquid sulfur dioxide vaporization, comprising a first chamber and a second chamber, wherein water and concentrated sulfuric acid are respectively contained in the first chamber and the second chamber; a water injection pipe connected to a water source is connected above the water surface in the first chamber, and a gas delivery pipe is connected below the water surface in the first chamber; a drain pipe is located at the bottom of the first chamber; an air inlet of a vent pipe is connected to the top of the first chamber, and an air outlet is submerged below the acid liquid surface in the second chamber; an exhaust pipe is connected to the top of the second chamber, and a liquid outlet pipe is located at the bottom of the second chamber; an acid injection pipe connected to a concentrated sulfuric acid source is connected above the liquid surface in the second chamber.

[0008] In the above scheme, the two chambers constitute the primary and secondary purification chambers for the sulfur dioxide gas to be treated, respectively. The primary purification chamber is filled with water as a washing medium to remove solid particulate matter from the gas. The secondary purification chamber is filled with concentrated sulfuric acid as a drying medium to deeply remove moisture from the gas. The equipment has a simple structure and high purification efficiency. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the purification device of the present invention. Detailed Implementation

[0010] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0011] A purification method for liquid sulfur dioxide vaporization involves first passing the vaporized liquid sulfur dioxide gas into water for washing and impurity removal, and then passing concentrated sulfuric acid into the gas to remove moisture, thereby obtaining purified sulfur dioxide gas.

[0012] Specifically, the following device is used to purify the high-purity sulfur dioxide gas to be purified: a purification device for liquid sulfur dioxide vaporization, including a first chamber 11 and a second chamber 12, wherein the first chamber 11 and the second chamber 12 are respectively filled with water and concentrated sulfuric acid; a water injection pipe 113 connected to the water source is connected above the water surface in the first chamber 11, and a gas delivery pipe 111 is connected below the water surface in the first chamber 11; a drain pipe 114 is located at the bottom of the first chamber 11; an air inlet 41 of a vent pipe 40 is connected to the top of the first chamber 11, and an air outlet 42 is submerged below the acid liquid surface in the second chamber 12; an exhaust pipe 122 is connected to the top of the second chamber 12, and a liquid outlet pipe 124 is located at the bottom of the second chamber 12; an acid injection pipe 123 connected to the concentrated sulfuric acid source is connected above the liquid surface in the second chamber 12.

[0013] The first chamber 11 and the second chamber 12 are two separate chambers formed by a partition 20 within the tank body 10. Specifically, a vertical cylindrical shell is divided into two non-communicating chambers by a vertically positioned titanium partition, forming a primary purification chamber and a secondary purification chamber respectively. This design is compact and occupies a small area. The titanium partition is welded to the inner wall of the shell for a sealed connection, preventing corrosion from sulfur dioxide and concentrated sulfuric acid. This solution integrates two-stage purification functions into a single device, significantly reducing the equipment's footprint, external piping, valves, and fittings. It also lowers manufacturing costs and the risk of system leakage. Compared to traditional purification equipment, it is smaller, more convenient, and significantly reduces replacement costs and labor intensity.

[0014] The baffle plates 30 installed in the first chamber 11 and the second chamber 12 are located above the liquid surface and below the air inlet 41 and the exhaust pipe 122. Their functions are twofold: first, to break up the liquid droplets carried by the rising gas, reducing the water content in the sulfur dioxide gas before it enters the second chamber 12; and second, to prevent the liquid from surging and overflowing from the top exhaust port under the impact of the gas. Specifically, the horizontally arranged baffle plates 30 have evenly distributed through holes.

[0015] The lower section of the vent pipe 40, submerged below the acid liquid level in the second chamber 12, has through holes forming the air outlet 42; the gas delivery pipe 111, positioned below the water surface in the first chamber 11, has through holes for air outlet. Both chambers' inlet pipes are designed as porous gas distributors to evenly distribute the incoming air into the liquid within the purification chamber, increasing the gas-liquid contact area and improving the gas purification effect.

[0016] Overflow ports 50 are respectively provided on the side walls of the first chamber 11 and the second chamber 12. The height of the overflow ports 50 is lower than the opening position of the water injection pipe 113 / acid injection pipe 123 to control the liquid level in the two chambers. The overflow ports 50 can be connected to the drain pipes 114 and outlet pipes 124 of the two chambers respectively. The wastewater containing solid particulate impurities discharged from the drain pipe 114 of the first chamber 11 enters the wastewater treatment system for treatment; the concentrated sulfuric acid that has absorbed water discharged from the outlet pipe 124 of the second chamber 12 is transported to the silver anode mud acid leaching kettle as the acid leaching reagent for the silver anode mud.

[0017] Isolation valves are provided on the gas and liquid inlet and outlet pipes of the first chamber 11 and the second chamber 12. Specifically, isolation valves are provided on the gas delivery pipe 111, water injection pipe 113, liquid discharge pipe 114, vent pipe 40, exhaust pipe 122, acid injection pipe 123, and liquid outlet pipe 124.

[0018] In the purification device of the present invention, in order to prevent corrosion by sulfur dioxide or concentrated sulfuric acid, all components in contact with the medium, including the tank 10, the unit 20, the baffle plate 30, and the air inlet pipe immersed below the liquid surface, are made of materials resistant to sulfur dioxide and sulfuric acid corrosion, such as titanium, 316L stainless steel, or carbon steel lined with fluoroplastic.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The integrated device for filtering impurities in sulfur dioxide gas provided by the present invention integrates two-stage purification functions into one device, which has a compact structure, small footprint, high processing efficiency and low cost.

[0021] 2. The two-stage purification air intake adopts a porous gas distribution structure, which ensures that the gas passes through the liquid layer evenly in the form of microbubbles, increasing the gas-liquid contact area and thus improving the efficiency of solid particulate matter removal and moisture drying; the built-in baffle 30 can effectively break and capture the liquid droplets carried by the gas during the gas rise, preventing water or concentrated sulfuric acid from being carried out of the equipment by the gas, ensuring the quality of the purified gas and the safety of subsequent operations.

[0022] 3. Both cleanrooms are equipped with independent exhaust and drainage ports and isolation valves, which facilitates the replacement, discharge or maintenance of media in either chamber without affecting the other chamber.

Claims

1. A method for purifying liquid sulfur dioxide after vaporization, characterized in that: The gas to be purified after the liquid sulfur dioxide is vaporized is first passed through water to wash away impurities, and then concentrated sulfuric acid is passed through to remove water, thus obtaining purified sulfur dioxide gas.

2. A purification device for liquid sulfur dioxide vaporization, characterized in that: The system includes a first chamber (11) and a second chamber (12), which contain water and concentrated sulfuric acid, respectively. A water injection pipe (113) connected to the water source is connected above the water surface in the first chamber (11), and a gas delivery pipe (111) connected to the gas surface in the first chamber (11) is connected below the water surface in the first chamber (11). A drain pipe (114) is located at the bottom of the first chamber (11). The air inlet (41) of the vent pipe (40) is connected to the top of the first chamber (11), and the air outlet (42) is submerged below the acid liquid surface in the second chamber (12). An exhaust pipe (122) is connected to the top of the second chamber (12), and a liquid outlet pipe (124) is located at the bottom of the second chamber (12). An acid injection pipe (123) connected to the concentrated sulfuric acid source is connected above the liquid surface in the second chamber (12).

3. The purification device for liquid sulfur dioxide vaporization according to claim 2, characterized in that: The first chamber (11) and the second chamber (12) are two chambers separated by a partition (20) on the tank body (10).

4. The purification device for liquid sulfur dioxide vaporization according to claim 2, characterized in that: The baffles (30) installed in the first chamber (11) and the second chamber (12) are located above the liquid surface and below the air inlet (41) and the exhaust pipe (122).

5. The purification device for liquid sulfur dioxide vaporization according to claim 4, characterized in that: The horizontally arranged baffle (30) has through holes evenly distributed on it.

6. The purification device for liquid sulfur dioxide vaporization according to claim 2, characterized in that: The through holes arranged on the lower section of the vent pipe (40) submerged in the second chamber (12) below the acid liquid level constitute the air outlet (42); the through holes arranged on the section of the gas delivery pipe (111) placed below the water surface in the first chamber (11) are used for gas outlet.

7. The purification device for liquid sulfur dioxide vaporization according to claim 2, characterized in that: Overflow ports (50) are provided on the side walls of the first chamber (11) and the second chamber (12), respectively. The height of the overflow ports (50) is lower than the opening position of the water injection pipe (113) / acid injection pipe (123).

8. The purification device for liquid sulfur dioxide vaporization according to claim 2, characterized in that: Isolation valves are provided on the gas delivery pipe (111), water injection pipe (113), liquid discharge pipe (114), vent pipe (40), exhaust pipe (122), acid injection pipe (123), and liquid outlet pipe (124).

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