Waste gas treatment system in vitamin C production

Abstract

The utility model relates to the technical field of vitamin C production, in particular to a waste gas treatment system in vitamin C production. The waste gas treatment system in vitamin C production comprises a fermentation tank, the fermentation tank is connected with an ion exchange column through an esterification reaction kettle, the ion exchange column is connected with a concentration and crystallization device through a two-stage membrane, the concentration and crystallization device is connected with a washing device, and the washing device is connected with a xylene recovery tower through a xylene inlet recovery tower pipeline. The fermentation tank is connected with the carbon dioxide treatment tank. According to the system, the carbon dioxide treatment tank and the xylene recovery tower are separately arranged, so that waste gases in different reaction stages are respectively treated, and the treatment difficulty of the waste gases is greatly reduced; through the arrangement of the carbon dioxide treatment tank, carbon dioxide generated by the fermentation tank and sodium hydroxide in the two-stage membrane are mixed and react, so that the utilization rate of waste gas is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vitamin C production, in particular to a waste gas treatment system in vitamin C production. Background Art

[0002] Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that is essential for human health. It plays a role in boosting the immune system, promoting wound healing, maintaining bone and tooth health, and acting as an antioxidant. The existing vitamin C production process generally includes fermentation, extraction, purification, drying, and preparation.

[0003] In workshop production, the production of vitamin C is often accompanied by the generation of waste gas. The existing equipment collects and treats the waste gas in a centralized manner. However, various waste gases are mixed in a disorderly manner. Some gases that could have been recycled are no longer easy to separate from the mixed waste gas, which not only makes the waste gas treatment difficult, but also causes some economic losses. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a waste gas treatment system in the production of vitamin C. By separately setting up a carbon dioxide treatment tank and a xylene recovery tower, the waste gas in different reaction stages is treated separately, which greatly reduces the difficulty of waste gas treatment; through the setting of the carbon dioxide treatment tank, the carbon dioxide generated by the fermentation tank is mixed with the sodium hydroxide in the double-stage membrane to react, which greatly improves the utilization rate of the waste gas; through the setting of the xylene recovery tower, the xylene volatilized by the device is recovered and reused, which greatly improves the utilization rate of xylene.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The waste gas treatment system in the production of vitamin C includes a fermentation tank, which is connected to an ion exchange column through an esterification reactor, the ion exchange column is connected to a concentration and crystallization device through a double-stage membrane, the concentration and crystallization device is connected to a washing device, the washing device is connected to a xylene recovery tower through a xylene recovery tower pipeline, and the fermentation tank is connected to a carbon dioxide treatment tank.

[0007] The carbon dioxide treatment tank is used to mix and react the carbon dioxide produced by the fermentation tank with the sodium hydroxide in the double-stage membrane to produce sodium carbonate.

[0008] The fermentation tank is provided with a temperature control coil inside, and a temperature control water inlet pipe is connected to the temperature control coil. The temperature control coil plays a role of increasing the temperature at the beginning of the fermentation reaction, and plays a role of cooling down when the fermentation reaction is proceeding normally.

[0009] A gas disperser is arranged inside the carbon dioxide treatment tank, and the fermentation tank is connected to the gas disperser through a carbon dioxide pipeline.

[0010] The double-stage membrane is connected to the carbon dioxide treatment tank through a sodium hydroxide inlet treatment tank pipeline.

[0011] A spray plate is arranged inside the xylene recovery tower, a ventilation guide plate is arranged below the spray plate, and a liquid level meter is arranged outside the vertical wall of the xylene recovery tower.

[0012] The bottom of the xylene recovery tower is connected to a circulation pump through a pipeline, and the circulation pump is connected to a spray plate through a pipeline.

[0013] The connecting pipe between the xylene recovery tower and the circulating pump is connected with a liquid replenishing pipe, which is connected with the temperature control coil. The liquid phase in the temperature control coil is a mixed phase, containing a non-polar solvent and water, which can be used to replenish the xylene recovery tower.

[0014] The working principle of the utility model is:

[0015] After the raw materials enter the fermentation tank, the temperature control coil starts working, and the generated gas phase enters the carbon dioxide treatment tank through the carbon dioxide pipeline. After the reaction is completed, the liquid phase enters the esterification reactor through the pipeline for reaction. After the reaction is completed, it enters the double-stage membrane through the ion exchange column. The sodium hydroxide solution generated in the double-stage membrane treatment enters the carbon dioxide treatment tank through the sodium hydroxide inlet treatment tank pipeline; after the double-stage membrane treatment is completed, it enters the washing device through the concentration and crystallization device for washing. The volatilized xylene enters the xylene recovery tower through the xylene inlet recovery tower pipeline. The circulation pump starts, and the xylene recovery tower starts working. When the liquid level of the xylene recovery tower is reduced, it is replenished through the replenishment pipeline. Among them, the carbon dioxide treatment tank is used to mix the carbon dioxide generated by the fermentation tank with the sodium hydroxide in the double-stage membrane to generate sodium carbonate.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] By adopting the waste gas treatment system in vitamin C production of the utility model, waste gases in different reaction stages are treated separately by separately setting up a carbon dioxide treatment tank and a xylene recovery tower, which greatly reduces the difficulty of waste gas treatment; by setting up the carbon dioxide treatment tank, the carbon dioxide generated by the fermentation tank is mixed with the sodium hydroxide in the double-stage membrane for reaction, which greatly improves the utilization rate of the waste gas; by setting up the xylene recovery tower, the xylene volatilized by the device is recovered and reused, which greatly improves the utilization rate of the xylene. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the waste gas treatment system in the production of vitamin C of the utility model;

[0019] In the figure: 1. Fermentation tank; 2. Esterification reactor; 3. Ion exchange column; 4. Double-stage membrane; 5. Concentration and crystallization device; 6. Washing device; 7. Carbon dioxide treatment tank; 8. Xylene recovery tower; 9. Temperature control coil; 10. Gas disperser; 11. Circulation pump; 12. Spray plate; 13. Ventilation guide plate; 14. Liquid level meter; 15. Xylene recovery tower inlet pipeline; 16. Liquid replenishment pipeline; 17. Temperature control water inlet pipeline; 18. Carbon dioxide pipeline; 19. Sodium hydroxide inlet pipeline for treatment tank. DETAILED DESCRIPTION

[0020] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0021] Example 1

[0022] like Figure 1 As shown, the waste gas treatment system in the production of vitamin C includes a fermentation tank 1, which is connected to an ion exchange column 3 through an esterification reactor 2, and the ion exchange column 3 is connected to a concentration and crystallization device 5 through a double-stage membrane 4, and the concentration and crystallization device 5 is connected to a washing device 6, and the washing device 6 is connected to a xylene recovery tower 8 through a xylene inlet recovery tower pipeline 15, and the fermentation tank 1 is connected to a carbon dioxide treatment tank 7. A temperature control coil 9 is provided inside the fermentation tank 1, and a temperature control water inlet pipeline 17 is connected to the temperature control coil 9. The temperature control coil 9 plays a role in raising the temperature at the beginning of the fermentation reaction, and plays a role in cooling when the fermentation reaction is carried out normally. A gas disperser 10 is provided inside the carbon dioxide treatment tank 7, and the fermentation tank 1 is connected to the gas disperser 10 through a carbon dioxide pipeline 18. The double-stage membrane 4 is connected to the carbon dioxide treatment tank 7 through a sodium hydroxide inlet treatment tank pipeline 19. A spray plate 12 is provided inside the xylene recovery tower 8, and a ventilation guide plate 13 is provided below the spray plate 12, and a liquid level meter 14 is provided on the outer side of the vertical wall of the xylene recovery tower 8. The bottom of the xylene recovery tower 8 is connected to the circulation pump 11 through a pipeline, and the circulation pump 11 is connected to the spray plate 12 through a pipeline. The connecting pipeline between the xylene recovery tower 8 and the pipeline and the circulation pump 11 is connected to a liquid replenishment pipeline 16, and the liquid replenishment pipeline 16 is connected to the temperature control coil 9. The liquid phase in the temperature control coil 9 is a mixed phase, containing a non-polar solvent and water, which can be used to replenish the xylene recovery tower.

[0023] The above-mentioned waste gas treatment system in the production of vitamin C, when in operation, comprises the following steps:

[0024] (1) After the raw materials enter the fermentation tank 1, the temperature control coil 9 starts to work, and the generated gas phase enters the carbon dioxide treatment tank 7 through the carbon dioxide pipeline 18. After the reaction is completed, the liquid phase enters the esterification reactor 2 through the pipeline for reaction. After the reaction is completed, it enters the double-stage membrane 4 through the ion exchange column 3. The sodium hydroxide solution generated during the treatment of the double-stage membrane 4 enters the carbon dioxide treatment tank 7 through the sodium hydroxide inlet tank pipeline 19; (2) After the treatment of the double-stage membrane 4 is completed, it enters the washing device 6 through the concentration crystallization device 5 for washing. The volatilized xylene enters the xylene recovery tower 8 through the xylene inlet recovery tower pipeline 15. The circulating pump 11 is started, and the xylene recovery tower 8 starts to work. When the liquid level of the recovered liquid in the xylene recovery tower 8 is reduced, it is replenished through the liquid replenishment pipeline 16.

Claims

1. A waste gas treatment system in vitamin C production, characterized in that: The invention comprises a fermentation tank (1), wherein the fermentation tank (1) is connected to an ion exchange column (3) via an esterification reaction kettle (2), the ion exchange column (3) is connected to a concentration crystallization device (5) via a double-stage membrane (4), the concentration crystallization device (5) is connected to a washing device (6), the washing device (6) is connected to a xylene recovery tower (8) via a xylene recovery tower pipeline (15), and the fermentation tank (1) is connected to a carbon dioxide treatment tank (7).

2. The waste gas treatment system in vitamin C production according to claim 1, characterized in that: The fermentation tank (1) is provided with a temperature control coil (9) inside, and a temperature control water inlet pipe (17) is connected to the temperature control coil (9).

3. The waste gas treatment system in vitamin C production according to claim 1, characterized in that: A gas disperser (10) is provided inside the carbon dioxide treatment tank (7), and the fermentation tank (1) is connected to the gas disperser (10) via a carbon dioxide pipeline (18).

4. The waste gas treatment system in vitamin C production according to claim 1, characterized in that: The double-stage membrane (4) is connected to the carbon dioxide treatment tank (7) through a sodium hydroxide treatment tank inlet pipeline (19).

5. The waste gas treatment system in vitamin C production according to claim 2, characterized in that: A spray plate (12) is provided inside the xylene recovery tower (8), a ventilation guide plate (13) is provided below the spray plate (12), and a liquid level meter (14) is provided on the outer side of the vertical wall of the xylene recovery tower (8).

6. The waste gas treatment system in vitamin C production according to claim 5, characterized in that: The bottom of the xylene recovery tower (8) is connected to a circulation pump (11) through a pipeline, and the circulation pump (11) is connected to a spray plate (12) through a pipeline.

7. The waste gas treatment system in vitamin C production according to claim 6, characterized in that: The connecting pipe between the xylene recovery tower (8) and the pipeline and the circulation pump (11) is connected with a liquid replenishing pipe (16), and the liquid replenishing pipe (16) is connected with the temperature control coil (9).

Images