A system for treating light ends from organic-containing spent sulfuric acid

Abstract

The application provides a system for treating light components in waste sulfuric acid containing organic matters, which removes part of the light components in the waste sulfuric acid through a waste acid preheater, reduces the operation load of a stripping tower, and then removes the remaining light components in the waste sulfuric acid by using the stripping tower, so that the highest efficiency of removing the light components is realized, and the treatment capacity of the stripping tower is improved. In the application, no operation equipment is involved, full-automatic operation is adopted, the process operation is simple, the cost is low, and maintenance is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of chloromethane drying technology, and relates to a system for treating light components of waste sulfuric acid containing organic matter. Background Technology

[0002] Currently, the synthesis of chloromethane produces a large amount of waste sulfuric acid with a concentration of approximately 83%. This waste sulfuric acid contains various organic compounds such as dimethyl sulfate, dimethyl ether, and methanol, and is brownish-red or blackish-red in color, making it difficult to sell. Treating this waste sulfuric acid requires significant energy consumption and is costly, especially the purification and removal of organic matter. Furthermore, current sulfuric acid concentration processes cannot effectively remove organic matter from the waste sulfuric acid, failing to achieve true recycling. Utility Model Content

[0003] The purpose of this invention is to provide a system for treating light components from waste sulfuric acid containing organic matter, in order to solve the problem of high energy consumption in treating waste sulfuric acid, a byproduct of chloromethane synthesis.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This application provides a system for treating light components of waste sulfuric acid containing organic matter, comprising a static mixer, a waste acid preheater, a stripping tower, and a waste acid storage tank connected in sequence. The bottom of the stripping tower is provided with a stripping tower heater. Both the waste acid preheater and the stripping tower are connected to a steam pipeline. The stripping tower includes a distribution tray and a packing section located below the distribution tray. The distribution tray is provided with through holes.

[0005] Preferably, the distribution tray is further provided with an overflow pipe, which is connected to the middle of the packing section.

[0006] Preferably, the stripping tower is further provided with a gas riser, the two ends of which are located at the distribution tray and the support tray, respectively.

[0007] Preferably, the temperature of the waste acid preheater is 80-90℃.

[0008] Preferably, the liquid level in the waste acid preheater is 35-55% of the height of the waste acid preheater cylinder.

[0009] Preferably, the temperature of the stripping tower is 100-110℃.

[0010] This utility model has the following beneficial effects: In this application, a waste acid preheater removes some of the light organic components from the waste sulfuric acid, reducing the operating load on the stripping tower. Then, the stripping tower is used to remove the remaining light organic components from the waste sulfuric acid, maximizing the removal efficiency of these components and increasing the stripping tower's processing capacity. This application does not involve any operating equipment; it employs fully automated operation, resulting in a simple process, low cost, and easy maintenance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a system for treating light components from organic waste sulfuric acid, provided in an embodiment of this application. Figure 2 This is a schematic diagram of the internal structure of the stripping tower provided in an embodiment of this application; Symbolic representation: 1-Static mixer, 2-Waste acid preheater, 3-Stripping tower, 4-Stripping tower heater, 5-Waste acid storage tank, 6-Steam pipeline; 301-Distribution tray, 302-Packing section, 303-Through hole, 304-Overflow pipe, 305-Gas riser, 306-Support tray. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] This application provides a system for treating light components of waste sulfuric acid containing organic matter. The system includes a static mixer 1, a waste acid preheater 2, a stripping tower 3, and a waste acid storage tank 5 connected in sequence. A stripping tower heater 4 is installed at the bottom of the stripping tower 3, and both the waste acid preheater 2 and the stripping tower 3 are connected to a steam pipeline 6, as shown in the attached diagram. Figure 1 As shown.

[0014] Static mixer 1 is a component used in the chloromethane synthesis process to mix waste sulfuric acid, a byproduct, with water to form an acidic aqueous solution. In this embodiment, the waste sulfuric acid is diluted to a 2% acidic aqueous solution. The diluted waste sulfuric acid from static mixer 1, along with low-pressure steam from steam line 6, enters waste acid preheater 2 at a temperature of 80-90°C. In waste acid preheater 2 at 80-90°C, the low-pressure steam from steam line 6 comes into countercurrent contact with the diluted waste sulfuric acid, and bubbling occurs within the diluted waste sulfuric acid. This causes easily separable light organic components in the waste sulfuric acid to be heated, vaporized, and separated from the diluted waste sulfuric acid, then stably entering stripping tower 3 from the top. Simultaneously, the remaining waste sulfuric acid enters stripping tower 3 from the bottom of the tower. The countercurrent contact between low-pressure steam and diluted waste sulfuric acid can greatly extend the residence time of waste sulfuric acid, allowing about 30% of the light organic components to overflow from the waste acid preheater 2, thereby improving the separation efficiency of the light organic components, saving energy, and reducing the operating load of the stripping tower.

[0015] To prevent waste sulfuric acid from corroding the waste acid preheater 2, the waste acid preheater 2 in this embodiment is made of corrosion-resistant materials, such as enamel. Preferably, the liquid level in the waste acid preheater 2 is 35-55% of the height of the waste acid preheater cylinder to prevent the light components of the distilled organic matter from carrying liquid waste sulfuric acid into the stripping tower 3 from the top during the bubbling process.

[0016] The stripping tower 3 is a component for stripping waste sulfuric acid. In this embodiment, the stripping tower 3 includes a distribution tray 301 and a packing section 302 located below the distribution tray 301, as shown in the attached diagram. Figure 2 As shown. The distribution tray 301 has through holes 303 to allow waste sulfuric acid to flow downwards into the packing section 302 after passing through the distribution tray 301. The stripping tower 3 operates at a temperature of 100-110℃, and solid substances may be generated during the stripping process. Therefore, in this embodiment, the distribution tray 301 is also equipped with an overflow pipe 304, which connects to the middle of the packing section 302. The overflow pipe 304 increases the diameter, preventing blockage of the through holes 303 on the distribution tray 301. Additionally, the stripping tower 3 is equipped with a gas riser 305, with its two ends located at the distribution tray 301 and the support tray 306, respectively. The top of the gas riser 305 has a large square opening, allowing steam and light organic components to rise to the top of the stripping tower 3 and be discharged; the remaining waste sulfuric acid is discharged into the waste acid storage tank 5. To reduce production costs, the packing section 302 in this embodiment has a shortened tower diameter.

[0017] The arrangement of the distribution tray 301, packing section 302, overflow pipe 304, and gas riser 305 within the stripping tower 3 ensures sufficient contact between gas and liquid in the packing section 302, preventing mutual contact on the distribution tray 301. Furthermore, the waste sulfuric acid, after leaving the distribution tray 301, is evenly distributed within the packing section 302, increasing the treatment efficiency of light organic components in the waste sulfuric acid and improving production operation quality. When the content of light organic components in the waste sulfuric acid reaches 99.3%, the light organic components are sent to the incineration unit for incineration.

[0018] The stripping tower heater 4 is a component used to heat the stripping tower 3 to 100-110℃.

[0019] Furthermore, the operating process of the system for treating light components of waste sulfuric acid containing organic matter provided in this application embodiment is as follows: Waste sulfuric acid, a byproduct of chloromethane synthesis, is mixed with water in a static mixer 1 to form an acidic aqueous solution, which then enters the waste acid preheater 2 at a temperature of 80-90°C along with low-pressure steam from steam pipeline 6. In the waste acid preheater 2 at 80-90°C, the low-pressure steam from steam pipeline 6 comes into countercurrent contact with the diluted waste sulfuric acid, and bubbling occurs within the diluted waste sulfuric acid. This causes the easily separable light organic components in the waste sulfuric acid to be heated and vaporized, separating them from the diluted waste sulfuric acid, and stably entering the stripping tower 3 from the top. Simultaneously, the remaining waste sulfuric acid enters the stripping tower 3 from the bottom of the tower. After the light organic components, waste sulfuric acid treated by the waste acid preheater 2, and low-pressure steam from the steam pipeline 6 enter the stripping tower 3, the steam and waste sulfuric acid come into full contact in the packed section 302, thereby separating the remaining light organic components from the waste sulfuric acid. These light organic components, along with the light organic components introduced into the stripping tower 3, are discharged through the gas riser 305. When the content of light organic components in the waste sulfuric acid reaches 99.3%, the light organic components are sent to the incineration unit for incineration.

[0020] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A system for treating light components from organic waste sulfuric acid, characterized in that, The system includes a static mixer (1), a waste acid preheater (2), a stripper (3), and a waste acid storage tank (5) connected in sequence. The bottom of the stripper (3) is provided with a stripper heater (4). The waste acid preheater (2) and the stripper (3) are both connected to a steam pipeline (6). The stripper (3) includes a distribution tray (301) and a packing section (302) located below the distribution tray (301). The distribution tray (301) is provided with through holes (303).

2. The system for treating light components of waste sulfuric acid containing organic matter according to claim 1, characterized in that, The distribution tray (301) is also provided with an overflow pipe (304), which is connected to the middle of the packing section (302).

3. The system for treating light components of waste sulfuric acid containing organic matter according to claim 1, characterized in that, The stripping tower (3) is also equipped with a gas riser (305), with the two ends of the gas riser (305) located at the distribution tray (301) and the support tray (306), respectively.

4. The system for treating light components of waste sulfuric acid containing organic matter according to claim 1, characterized in that, The temperature of the waste acid preheater (2) is 80-90℃.

5. The system for treating light components of waste sulfuric acid containing organic matter according to claim 1, characterized in that, The liquid level in the waste acid preheater (2) is 35-55% of the height of the waste acid preheater (2) cylinder.

6. The system for treating light components of waste sulfuric acid containing organic matter according to claim 1, characterized in that, The temperature of the stripping tower (3) is 100-110℃.

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