Vitamin B6 production workshop ethanol storage and conveying system

Abstract

The utility model provides a storage and conveying system for ethanol in a vitamin B6 production workshop, and belongs to the technical field of compound synthesis equipment. Comprising an underground liquid tank, a control tank and a plurality of heat conduction pipes axially and evenly distributed on the outer side of the underground liquid tank, a partition plate is arranged in the middle of the control tank and divides the control tank into a breathing cavity located above the partition plate and a backflow cavity located below the partition plate, the upper ends of the heat conduction pipes are connected with the backflow cavity of the control tank, and the lower ends of the heat conduction pipes are connected with the lower portion of the underground liquid tank. A breathing pipe is connected between the breathing cavity and the top of the underground liquid tank, the top of the control tank is connected with a pressure limiting pipe, the bottom of the underground liquid tank is connected with a low-temperature material pipe, and a backflow cavity of the control tank is connected with a high-temperature feeding pipe. The device has the advantages of low energy consumption and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of compound synthesis equipment and relates to an ethanol storage and transportation system for a vitamin B6 production workshop. Background Art

[0002] The oxalic acid used in the production of vitamin B6 is mostly made from oxalic acid oxidized to produce diethyl oxalate, that is, oxalic acid produced by oxidizing glucose with nitric acid (oxidation method). Starch is first hydrolyzed with acid to produce glucose, and glucose is oxidized with nitric acid to produce oxalic acid. The finished product is obtained through cooling and crystallization, centrifugal separation, dissolving activated carbon for decolorization, recrystallization, centrifugal separation, drying and packaging. In comparison, industrial oxalic acid is cheaper. Therefore, industrial oxalic acid is used in large quantities in the production of vitamin B6. Industrial oxalic acid is made by adding water to coal and reacting with oxygen in the air under high temperature and pressure to produce carbon monoxide. Carbon monoxide and nitrite are synthesized into dimethyl oxalate under high temperature and high pressure. Dimethyl oxalate is hydrolyzed with water to produce oxalic acid and ethanol. After removing the ethanol, the finished oxalic acid is obtained through cooling and crystallization and drying.

[0003] In the processing of vitamin B6, when processing the intermediate N-ethoxyoxalyl-L-alanine ethyl ester, diethyl oxalate is first reacted with alanine, then excess diethyl oxalate is recovered, anhydrous ethanol and concentrated phosphoric acid are added, and finally ethanol is recovered. After further recovery of diethyl oxalate, the intermediate is obtained, as described in the applicant's prior application (application number: CN202311483862.X).

[0004] In summary, in the processing workshop of vitamin B6, there are many scenarios of ethanol use, as raw materials and recyclates. As we all know, the distillation method is often used to recycle ethanol, which is condensed at high temperature and then at low temperature, which consumes a lot of energy. When preparing the intermediate N-ethoxyoxalyl-L-alanine ethyl ester, the mixed material is required to have a certain temperature (40-45°C) after adding ethanol. The ethanol stored as a raw material is generally in a low temperature state (low temperature storage to ensure storage safety). Therefore, in the workshop, ethanol is frequently used as a raw material and recyclate under the condition that different usage scenarios of ethanol are independent of each other. It is frequently heated and cooled, which is a huge waste of energy. Therefore, since more ethanol is used in pharmaceutical-grade refining and more ethanol is produced, the ethanol used is generally stored in the workshop in the form of canned storage. The ethanol produced by processing or recovered during processing is stored in the tank after condensation, which consumes a lot of energy. At the same time, due to the mismatch between what is used and what is needed, the long-term accumulation requires a large storage space and cost for the recovered ethanol produced by processing, and there are also storage safety hazards. Utility Model Content

[0005] The purpose of the utility model is to provide an ethanol storage and delivery system for a vitamin B6 production workshop in view of the above-mentioned problems existing in the prior art. The technical problem to be solved by the utility model is how to reduce energy consumption.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a storage and transportation system for ethanol in a vitamin B6 production workshop, characterized in that it includes an underground liquid tank, a control tank and a plurality of heat-conducting pipes axially evenly distributed on the outside of the underground liquid tank, the control tank has a partition in the middle, the partition divides the control tank into a breathing chamber above the partition and a reflux chamber below the partition, the upper end of the heat-conducting pipe is connected to the reflux chamber of the control tank, the lower end of the heat-conducting pipe is connected to the lower part of the underground liquid tank, a breathing tube is connected between the breathing chamber and the top of the underground liquid tank, a pressure-limiting pipe is connected to the top of the control tank, a low-temperature material pipe is connected to the bottom of the underground liquid tank, and a high-temperature feed pipe is connected to the reflux chamber of the control tank.

[0007] Furthermore, the heat pipe is located underground.

[0008] The heat transfer pipe and the underground liquid tank are both storage spaces for liquid ethanol. The volume of the underground liquid tank is much larger than that of the control tank. After the uncondensed gaseous ethanol enters the reflux chamber from the high-temperature feed pipe, the pressure in the reflux chamber increases, driving the liquid ethanol originally in the reflux pipe into the underground liquid tank, while the gaseous and condensed ethanol with higher temperature remains in the reflux pipe. Many reflux pipes act as condensers for the higher-temperature ethanol that enters the reflux chamber instantly and continuously, and use the lower temperature of the underground soil to achieve faster cooling. When the liquid ethanol in the underground liquid tank is transported out through the low-temperature feed pipe, the liquid level in the underground liquid tank drops, but the liquid level drop of the heat transfer pipe is not obvious, because the breathing pipe can provide pressure compensation for the top of the underground liquid tank, while the pressure of the reflux chamber will maintain negative pressure during the process of the underground liquid tank level dropping. On the other hand, when the gaseous ethanol enters the reflux chamber, since the top of the underground liquid tank is at normal pressure and the reflux chamber is at positive pressure, the liquid level in the heat transfer pipe will drop rapidly, providing a faster cooling environment for the newly entered ethanol to be cooled. The pressure-limiting tube can adjust the pressure of the breathing chamber. For example, it can be adjusted to negative pressure when high-temperature ethanol is filled, and to positive pressure when low-temperature ethanol is discharged. Positive pressure can provide the discharge pressure of low-temperature ethanol, and can also further increase the ethanol storage capacity in the heat transfer tube. When ethanol is frequently introduced in and out, the underground heat dissipation environment can be fully utilized.

[0009] It is not difficult to see that the above method can make full use of the heat pipes and the underground low-temperature environment. The utilization rate of the heat pipes is high in both the states of filling with high-temperature ethanol and discharging low-temperature ethanol. The ethanol can be cooled quickly, reducing energy consumption. The underground storage method also greatly improves reliability and safety, and meets the ethanol storage conditions. Especially in summer, this storage method can greatly improve the ethanol reuse conditions and greatly reduce the storage space occupied in the workshop. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1It is a schematic diagram of the structure of the ethanol storage and transportation system (only two heat pipes are shown).

[0011] In the figure, 1. underground liquid tank; 2. control tank; 3. heat transfer pipe; 4. breathing chamber; 5. reflux chamber; 6. breathing tube; 7. pressure limiting tube; 8. low-temperature material pipe; 9. high-temperature feed pipe. DETAILED DESCRIPTION

[0012] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0013] like Figure 1 As shown, it includes an underground liquid tank 1, a control tank 2 and a plurality of heat-conducting pipes 3 axially evenly distributed on the outside of the underground liquid tank 1. A partition is provided in the middle of the control tank 2, and the partition divides the control tank 2 into a breathing chamber 4 located above the partition and a reflux chamber 5 located below the partition. The upper end of the heat-conducting pipe 3 is connected to the reflux chamber 5 of the control tank 2, and the lower end of the heat-conducting pipe 3 is connected to the lower part of the underground liquid tank 1. A breathing tube 6 is connected between the breathing chamber 4 and the top of the underground liquid tank 1. A pressure-limiting pipe 7 is connected to the top of the control tank 2, and the pressure-limiting pipe 7 is connected to an air pump for regulating the air pressure in the breathing chamber 4. A low-temperature material pipe 8 is connected to the bottom of the underground liquid tank 1, and a high-temperature feed pipe 9 is connected to the reflux chamber 5 of the control tank 2.

[0014] The heat pipe 3 is located underground, and the control tank 2 is partially located on the bottom surface.

[0015] The heat conducting pipe 3 and the underground liquid tank 1 are both storage spaces for liquid ethanol. The volume of the underground liquid tank 1 is much larger than that of the control tank 2. After the uncondensed gaseous ethanol enters the reflux chamber 5 from the high-temperature feed pipe 9, the pressure in the reflux chamber 5 increases, driving the liquid ethanol originally in the reflux pipe into the underground liquid tank 1, while the gaseous and condensed ethanol with a higher temperature remains in the reflux pipe. Many reflux pipes act as condensers for the ethanol with a higher temperature that enters the reflux chamber 5 instantly and continuously, and use the lower temperature of the underground soil to achieve a faster cooling speed. When the liquid ethanol in the underground liquid tank 1 is transported out through the low-temperature material pipe 8, the liquid level in the underground liquid tank 1 drops, but the liquid level drop of the heat-conducting pipe 3 is not obvious, because the breathing pipe 6 can provide pressure compensation for the top of the underground liquid tank 1, but the pressure of the reflux chamber 5 will maintain negative pressure during the process of the liquid level drop of the underground liquid tank 1; on the other hand, when the gaseous ethanol enters the reflux chamber 5, since the top of the underground liquid tank 1 is at normal pressure, and the reflux chamber 5 is at positive pressure, the liquid level in the heat-conducting pipe 3 will drop rapidly, providing a more rapid cooling environment for the newly entered ethanol to be cooled. The pressure-limiting pipe 7 can adjust the pressure of the breathing chamber 4, such as adjusting it to negative pressure when filling with high-temperature ethanol, and adjusting it to positive pressure when discharging low-temperature ethanol. The positive pressure can provide the discharge pressure of low-temperature ethanol, and can also further increase the ethanol reserve in the heat-conducting pipe 3, and make full use of the underground heat dissipation environment when frequently entering and exiting ethanol.

[0016] It is not difficult to see that the above method can make full use of the heat pipe 3 and the underground low-temperature environment. The utilization rate of the heat pipe 3 is high in both the state of filling with high-temperature ethanol and discharging low-temperature ethanol. The ethanol can be cooled quickly, reducing energy consumption. The underground storage method also greatly improves the reliability and safety, and meets the ethanol storage conditions. Especially in summer, this storage method can greatly improve the ethanol reuse conditions and greatly reduce the storage space occupied in the workshop.

[0017] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A storage and delivery system for ethanol in a vitamin B6 production workshop, characterized in that: The invention comprises an underground liquid tank (1), a control tank (2) and a plurality of heat-conducting pipes (3) uniformly distributed axially on the outside of the underground liquid tank (1); the control tank (2) has a partition in the middle, the partition divides the control tank (2) into a breathing chamber (4) located above the partition and a reflux chamber (5) located below the partition; the upper end of the heat-conducting pipe (3) is connected to the reflux chamber (5) of the control tank (2); the lower end of the heat-conducting pipe (3) is connected to the lower part of the underground liquid tank (1); a breathing pipe (6) is connected between the breathing chamber (4) and the top of the underground liquid tank (1); the top of the control tank (2) is connected to a pressure-limiting pipe (7); the bottom of the underground liquid tank (1) is connected to a low-temperature material pipe (8); and the reflux chamber (5) of the control tank (2) is connected to a high-temperature feed pipe (9).

2. The storage and delivery system of ethanol in a vitamin B6 production workshop according to claim 1, characterized in that: The heat conducting pipe (3) is located underground.

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