A bamboo sap vacuum carbon dioxide dry distillation process and system

Abstract

The invention discloses a bamboo sap vacuum carbon dioxide dry distillation process and system, including a vacuum dry distillation tank, a condensation separator, a carbon dioxide storage tank, a liquid-liquid heater, a carbon dioxide heater, and a vacuum system, a carbon dioxide air supply system, a carbon dioxide recycling system, a carbon dioxide dry distillation system, a carbon dioxide cooling and preheating system, a carbon dioxide reheating system and a carbon dioxide emission system are formed through pipelines, valves and pump bodies. And the above-mentioned combined system is used to carry out the vacuum carbon dioxide dry distillation of bamboo sap. The invention opens up a new way to use carbon dioxide for bamboo sap dry distillation, increases the resource utilization of carbon dioxide; uses vacuum negative pressure to strengthen the actual effect of carbon dioxide dry distillation, reduces the influence of oxygen and the like on carbon dioxide dry distillation; improves the dry distillation yield of bamboo sap and other materials, and improves production efficiency; reduces the strict demand for high-temperature heat sources, and reduces production costs; compared with traditional processes and systems, it is more energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention relates to a bamboo sap vacuum carbon dioxide dry distillation process and system in the technical field of bamboo sap dry distillation. Background Art

[0002] Bamboo juice is the liquid that is extracted from the fresh stems of the Gramineae plants, such as light bamboo, gray bamboo or other bamboo species, after heating. It is usually prepared by dry distillation. Dry distillation refers to the method of placing the material in a container and roasting or heating it with fire to produce juice. Dry distillation generally uses a high temperature, mostly between 120 and 450°C, but due to different raw materials, the cracking temperatures of various materials are different, such as bamboo juice oil at around 350 to 400°C. Due to high heat treatment, the materials will undergo complex qualitative changes and form new compounds. For example, the compounds obtained by dry distillation of fresh bamboo, wood, and rice bran are mainly composed of acidic and phenolic substances that do not contain nitrogen, such as caproic acid, octanoic acid, heptanoic acid, nonanoic acid, decanoic acid, guaiacol, etc. When bamboo is dry distilled, water begins to be distilled above 100°C, and the thermal decomposition is the most prosperous at 350°C to 400°C, and gradually decreases above 450°C. The differences in the properties and composition of various raw materials (such as moisture, volatile components, oxygen content, etc.) and the differences in heating methods, temperatures, speeds and equipment will lead to large differences in the yield, composition and properties of the distillate, and directly affect the utilization and further processing of the distillate. The main bamboo sap used as bamboo sap are light bamboo, bitter bamboo, spotted bamboo, violet bamboo, ci bamboo, sweet bamboo, water bamboo, etc. The main components of bamboo sap are organic acids, aldehydes, phenols, ketones, alcohols and various amino acids, and also contain inorganic elements such as copper, iron, manganese, and zinc. Guaiacol and amino acids in bamboo sap are considered to be the main effective ingredients for expectorant and cough relieving effects. Bamboo sap is often used to treat lung heat phlegm congestion, cough and chest tightness, stroke phlegm confusion, convulsions, epilepsy, and other symptoms of phlegm heat obscuring the clear orifices, and is a holy medicine for phlegm.

[0003] CN 114350392 A discloses a method for extracting fresh bamboo sap by uniformly dry distilling bamboo slices. CN 106833710 A discloses an energy-saving device for preparing fresh bamboo sap by dry distillation, including a dry distillation pot body, a dry distillation pot cover, a condenser and a dry distillation liquid storage tank. CN 211159660U discloses an environmentally friendly dry distillation device for preparing fresh bamboo sap, and a microwave heating method causes the free water and water vapor in the bamboo material to migrate outward in the form of a permeate flow. CN 105925296 B relates to a device for preparing bamboo sap by dry distillation, including a dry distillation chamber, a bamboo sap collection device, and a material frame and a heating body in the dry distillation chamber. All of the above patents are completely different from the present invention. In the process of dry distilling bamboo sap, vacuum, carbon dioxide and other processes and system equipment are not involved. There are obvious essential differences, and no similar inventions have been proposed.

[0004] From the technical and economic point of view, the present invention proposes a bamboo sap vacuum carbon dioxide distillation process and system, which opens up a new way to use carbon dioxide for bamboo sap distillation and increases the resource utilization of carbon dioxide; compared with traditional processes and systems, the process and system are more energy-saving and environmentally friendly. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, to enhance the actual effect of bamboo sap dry distillation, to increase the dry distillation yield of materials, to improve production efficiency, to reduce the demand for high-temperature heat sources, and to reduce production costs, and thus a bamboo sap vacuum carbon dioxide dry distillation process and system are proposed.

[0007] (II) Technical solution

[0008] In order to solve the above technical problems, the technical solution of the present invention is:

[0009] A bamboo sap vacuum carbon dioxide dry distillation system mainly includes a vacuum dry distillation tank, a condensation separator, a carbon dioxide storage tank, a liquid-liquid heater, a carbon dioxide heater and other equipment. The above equipment constitutes a vacuum system, a carbon dioxide air supply system, a carbon dioxide recycling system, a carbon dioxide dry distillation system, a carbon dioxide cooling and preheating system, a carbon dioxide reheating system and a carbon dioxide emission system through pipelines, control valves and a pump body;

[0010] The vacuum pumping system and the carbon dioxide gas replenishing system intersect at the carbon dioxide storage tank; the vacuum pumping system and the carbon dioxide recycling system intersect at the vacuum distillation tank and the carbon dioxide storage tank, and the vacuum pumping system and the carbon dioxide distillation system intersect at the vacuum distillation tank; the carbon dioxide gas replenishing system and the carbon dioxide recycling system intersect at the carbon dioxide storage tank; the carbon dioxide recycling system and the carbon dioxide distillation system intersect at the vacuum distillation tank; the carbon dioxide cooling and preheating system and the carbon dioxide recycling system intersect at the condensation separator and the liquid-liquid heater; the carbon dioxide reheating system and the carbon dioxide recycling system intersect at the carbon dioxide heater.

[0011] Furthermore, the vacuum pumping system is used to discharge the gas inside the vacuum distillation tank and the carbon dioxide storage tank to form a vacuum environment; the vacuum pumping system includes a cooling water inlet pipe, a vacuum pump and a vacuum water outlet pipe connected in sequence, and an emptying pipe I connecting the vacuum distillation tank with the vacuum pump, and an emptying pipe II connecting the carbon dioxide storage tank with the vacuum pump; an inlet valve I is arranged on the cooling water inlet pipe, a water outlet valve I is installed on the vacuum water outlet pipe, and a vacuum valve I and a vacuum valve II are installed on the emptying pipe I and the emptying pipe II, respectively.

[0012] Furthermore, the carbon dioxide replenishment system is used to input carbon dioxide gas into the carbon dioxide storage tank; the carbon dioxide replenishment system includes a carbon dioxide inlet pipe connected to the air inlet of the carbon dioxide storage tank, a carbon dioxide inlet valve installed on the carbon dioxide inlet pipe, a drainage pump and a drain pipe for extracting residual water from the carbon dioxide storage tank, a drainage valve I is installed on the drain pipe, and a drainage valve II is installed on the water outlet pipe of the drainage pump.

[0013] Furthermore, the carbon dioxide recycling system includes a gas pipeline that connects the carbon dioxide storage tank, the liquid-liquid heater and the carbon dioxide heater in sequence, and two groups of branch pipes are set at the outlet of the carbon dioxide heater, one group of branch pipes is provided with a carbon dioxide outlet valve, and the other group of branch pipes is provided with a carbon dioxide circulation valve I and is connected to the vacuum distillation tank, the gas outlet end of the vacuum distillation tank is connected to the condensation separator through a pipeline installed with the carbon dioxide circulation valve II, and the condensation separator is connected to the carbon dioxide storage tank through a circulating fan.

[0014] Furthermore, the carbon dioxide distillation system includes a distillation pump, and the ends of the vacuum distillation tank and the condensation separator are connected to the distillation pump through pipelines equipped with distillation valves I and II, respectively, and a distillation valve III is arranged on the discharge pipe of the distillation pump.

[0015] Furthermore, the carbon dioxide cooling and preheating system includes a water inlet pipe that branches off from the starting end of the cooling water inlet pipe and is connected to the condensation separator, a hot water pipe that connects the water outlet of the condensation separator to the liquid-liquid heater, and a water outlet pipe for discharging cooling water from the liquid-liquid heater. A water inlet valve II is installed on the water inlet pipe, and a water outlet valve II is installed on the water outlet pipe.

[0016] Furthermore, the carbon dioxide reheating system includes a steam pipe for inputting water vapor into the carbon dioxide heater and a condensate pipe for discharging condensate from the carbon dioxide heater, a steam valve is installed on the steam pipe, and a condensate valve is installed on the condensate pipe; the carbon dioxide emission system includes a carbon dioxide exhaust pipe extending outward from the carbon dioxide heater, and a carbon dioxide outlet valve is installed on the carbon dioxide exhaust pipe.

[0017] The process of vacuum carbon dioxide distillation of bamboo sap using the above system comprises the following steps:

[0018] (1) loading the material to be distilled into the vacuum distillation tank, starting the vacuum pump, and exhausting the gas inside the vacuum distillation tank and the carbon dioxide storage tank through the vacuum pumping system to form a vacuum environment;

[0019] (2) starting the carbon dioxide filling system, filling the carbon dioxide storage tank with carbon dioxide gas, and emptying the residual water inside the carbon dioxide storage tank by the drainage pump;

[0020] (3) The carbon dioxide gas in the carbon dioxide storage tank is preheated by a liquid-liquid heater and heated by a carbon dioxide heater to form a high-temperature airflow, wherein the liquid-liquid heater is provided with heat by high-temperature water, and the carbon dioxide heater is provided with heat by water vapor; the high-temperature airflow dry-distills the material in the vacuum distillation tank, and the gas phase after dry distillation enters a condensation separator, and the dry distillation liquid is pumped out by a dry distillation pump;

[0021] (4) The gas phase dry distillate produced after the treatment in step (3) enters a condensation separator, and cooling water enters the condensation separator at the same time, and the carbon dioxide is condensed and then enters a carbon dioxide storage tank through a circulating fan to realize the recycling of carbon dioxide. The cooling water is heated to form high-temperature water and enters a liquid-liquid heater to preheat the carbon dioxide coming out of the carbon dioxide storage tank;

[0022] (5) The remaining carbon dioxide after the dry distillation is input into the carbon dioxide heater for recycling.

[0023] (III) Beneficial effects

[0024] After adopting the above technical solution, the present invention has the following beneficial effects:

[0025] (1) This process and system has opened up a new way to use carbon dioxide for bamboo sap dry distillation, increasing the resource utilization of carbon dioxide;

[0026] (2) The process and system utilize vacuum negative pressure to enhance the actual effect of carbon dioxide distillation of bamboo sap, and reduce the influence of oxygen and other factors on carbon dioxide distillation;

[0027] (3) The process and system improve the yield of dry distillation products of bamboo sap and other materials, and improve production efficiency;

[0028] (4) The process and system reduce the strict requirements for high temperature heat sources and reduce production costs;

[0029] (5) Compared with traditional processes and systems, this process and system is more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 The present invention is a schematic structural diagram of a bamboo sap vacuum carbon dioxide dry distillation system.

[0032] Illustrations: 1. Vacuum retort, 2. Retort pump, 3. Drain pump, 4. Condensation separator, 5. Circulation fan, 6. Carbon dioxide storage tank, 7. Liquid-liquid heater, 8. Carbon dioxide heater, 9. Vacuum pump, 10-1. Drain valve I, 10-2. Drain valve II, 11-1. Retort valve I, 11-2. Retort valve II, 11-3. Retort valve III, 12-1. Carbon dioxide circulation valve I, 12-2. Carbon dioxide circulation valve II, 13. Condensation valve, 14-steam valve, 15-Carbon dioxide outlet valve, 16-1. Water outlet valve I, 16-2. Water outlet valve II, 17-1. Water inlet valve I, 17-2. Water inlet valve II, 18. Carbon dioxide inlet valve, 19-1. Vacuum valve I, 19-2. Vacuum valve II. DETAILED DESCRIPTION

[0033] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, a bamboo sap vacuum carbon dioxide dry distillation system, the system includes a vacuum dry distillation tank 1, a condensation separator 4, a carbon dioxide storage tank 6, a liquid-liquid heater 7, a carbon dioxide heater 8 and other equipment, and the above equipment constitutes a vacuum system, a carbon dioxide air supply system, a carbon dioxide recycling system, a carbon dioxide dry distillation system, a carbon dioxide cooling and preheating system, a carbon dioxide reheating system and a carbon dioxide emission system through pipelines, control valves, and a pump body;

[0035] The vacuuming part and the carbon dioxide replenishing part cross at the carbon dioxide storage tank 6, cross with the carbon dioxide recycling part at the vacuum distillation tank 1 and the carbon dioxide storage tank 6, and cross with the carbon dioxide distillation part at the vacuum distillation tank 1; the carbon dioxide replenishing part and the carbon dioxide recycling part cross at the carbon dioxide storage tank 6; the carbon dioxide recycling part and the carbon dioxide distillation part cross at the vacuum distillation tank 1; the carbon dioxide cooling and preheating part and the carbon dioxide recycling part cross at the condensation separator 4 and the liquid-liquid heater 7; the carbon dioxide reheating part and the carbon dioxide recycling part cross at the carbon dioxide heater 8.

[0036] The vacuum pumping system is used to discharge the gas inside the vacuum distillation tank 1 and the carbon dioxide storage tank 6 to form a vacuum environment; the vacuum pumping system includes a cooling water inlet pipe, a vacuum pump 9 and a vacuum water outlet pipe connected in sequence, as well as an emptying pipe I connecting the vacuum distillation tank 1 with the vacuum pump 9, and an emptying pipe II connecting the carbon dioxide storage tank 6 with the vacuum pump 9; an inlet valve I17-1 is arranged on the cooling water inlet pipe, a water outlet valve I16-1 is installed on the vacuum water outlet pipe, and a vacuum valve I19-1 and a vacuum valve II 19-2 are installed on the emptying pipe I and the emptying pipe II respectively.

[0037] The working process of the vacuum pumping system is as follows:

[0038] First, open the water inlet valve I 17-1, cool the incoming water to enter the vacuum pump 9, and open the water outlet valve I 16-1 to drain the water under vacuum; secondly, close the other valves between the vacuum distillation tank 1 and the outside world, and only open the vacuum valve I 19-1 to extract the air from the vacuum distillation tank 1 until it is stable, and then close and open the vacuum valve I 19-1; finally, close the other valves between the carbon dioxide storage tank 6 and the outside world, and only open the vacuum valve II 19-2 to extract the air from the carbon dioxide storage tank 6 until it is stable, and then close the vacuum valve II 19-2.

[0039] The carbon dioxide replenishing system is used to input carbon dioxide gas into the carbon dioxide storage tank 6; the carbon dioxide replenishing system includes a carbon dioxide inlet pipe connected to the air inlet of the carbon dioxide storage tank 6, a carbon dioxide inlet valve 18 installed on the carbon dioxide inlet pipe, a drainage pump 3 and a drain pipe for extracting residual water from the carbon dioxide storage tank 6, a drainage valve I 10-1 is installed on the drain pipe, and a drainage valve II 10-2 is installed on the water outlet pipe of the drainage pump 3.

[0040] The working process of the carbon dioxide gas supplementation system is as follows:

[0041] After the vacuuming part is completed, carbon dioxide replenishment is required; first open the carbon dioxide inlet valve 18, and the carbon dioxide inlet pipe automatically allows the CO2 gas to enter the carbon dioxide storage tank 6, and replenishment can be performed at any time as needed; finally, the residual water in the carbon dioxide storage tank 6 enters the discharge pump 2 through the discharge valve I 10-1, and flows out from the discharge outlet through the discharge valve II 10-2.

[0042] The carbon dioxide recycling system includes a gas pipeline that connects a carbon dioxide storage tank 6, a liquid-liquid heater 7 and a carbon dioxide heater 8 in sequence, and two groups of branch pipes are set at the outlet of the carbon dioxide heater 8, one group of branch pipes is provided with a carbon dioxide outlet valve 15, and the other group of branch pipes is provided with a carbon dioxide circulation valve I 12-1 and is connected to a vacuum distillation tank 1, the gas outlet end of the vacuum distillation tank 1 is connected to a condensation separator 4 through a pipeline installed with a carbon dioxide circulation valve II 12-2, and the condensation separator 4 is connected to the carbon dioxide storage tank 6 through a circulation fan 5.

[0043] The working process of the carbon dioxide recycling system is as follows:

[0044] First, open the carbon dioxide circulation valve I 12-1 and the carbon dioxide circulation valve II 12-2, and close the other valves; secondly, the carbon dioxide coming out of the carbon dioxide storage tank 6 directly enters the liquid-liquid heater 7 for preheating; thirdly, the preheated carbon dioxide enters the carbon dioxide heater 8 for further heating; then, the high-temperature carbon dioxide after reheating enters the vacuum retort 1 through the carbon dioxide circulation valve I 12-2 for retort, takes out the gaseous retort, and enters the condensation separator 4 through the carbon dioxide circulation valve II 12-2 for condensation; finally, the condensed gaseous carbon dioxide enters the carbon dioxide storage tank 6 through the circulation fan 5, thereby completing the closed-loop recycling of carbon dioxide.

[0045] The carbon dioxide distillation system is linked with the carbon dioxide recycling system when working. The carbon dioxide distillation system includes a distillation pump 2, and the ends of the vacuum distillation tank 1 and the condensation separator 4 are connected to the distillation pump 2 through pipelines equipped with distillation valves I 11-1 and II 11-2, respectively, and a distillation valve III 11-3 is arranged on the discharge pipe of the distillation pump 2.

[0046] The carbon dioxide distillation workflow is as follows:

[0047] First, the material to be distilled is loaded into the vacuum distillation tank 1, and the vacuum operation is performed until it stabilizes and then stopped; secondly, the high-temperature and high-pressure carbon dioxide entering the vacuum distillation tank 1 through the carbon dioxide circulation valve I 12-1 permeates the material in the vacuum distillation tank 1, and takes out the effective ingredients, moisture, etc. inside the material; then, the gaseous carbon dioxide mixture after the penetration enters the condensation separator 4 through the carbon dioxide circulation valve II 12-2 for condensation, and the condensate is collected at the bottom of the condensation separator 4; finally, the distillate from the bottom of the vacuum distillation tank 1 passes through the distillation valve I 11-1, and the condensate at the bottom of the condensation separator 4 passes through the distillation valve II 11-2, and enters the distillation valve III11-3 through the distillation pump 2, and then flows out of the distillation outlet liquid.

[0048] The carbon dioxide cooling and preheating system includes a water inlet pipe branched from the starting end of the cooling water inlet pipe and connected to the condenser separator 4, a hot water pipe connecting the water outlet of the condenser separator 4 with the liquid-liquid heater 7, and a water outlet pipe for discharging cooling water from the liquid-liquid heater 7. A water inlet valve II 17-2 is installed on the water inlet pipe, and a water outlet valve II 16-2 is installed on the water outlet pipe.

[0049] The carbon dioxide cooling and preheating workflow is as follows:

[0050] First, the cooling inlet water enters the condensation separator 4 through the water inlet valve II 17-2 to condense the gaseous carbon dioxide mixture, and enters the liquid-liquid heater 7 after being heated; secondly, the high-temperature water preheats the carbon dioxide coming out of the carbon dioxide storage tank 6; finally, the preheated cooled water flows out as cooling outlet water through the water outlet valve II 16-2.

[0051] The carbon dioxide reheating system includes a steam pipe for inputting water vapor to the carbon dioxide heater 8 and a condensate pipe for discharging condensate from the carbon dioxide heater 8. A steam valve 14 is installed on the steam pipe, and a condensate valve 13 is installed on the condensate pipe.

[0052] The carbon dioxide reheating process is specifically as follows:

[0053] First, water vapor enters the carbon dioxide heater 8 through the steam valve 14; secondly, the high-temperature steam reheats the carbon dioxide from the liquid-liquid heater 6; finally, the condensed water from the carbon dioxide heater 8 flows out through the condensation valve 13.

[0054] The carbon dioxide exhaust system includes a carbon dioxide exhaust pipe extending outward from the carbon dioxide heater 8, and a carbon dioxide outlet valve 15 on the carbon dioxide exhaust pipe;

[0055] The carbon dioxide emission workflow is as follows:

[0056] First, after the carbonization operation is completed, the carbon dioxide can be recycled; finally, the carbon dioxide enters the carbon dioxide outlet 15 through the carbon dioxide heater 8 and flows to the carbon dioxide outlet for recycling.

[0057] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bamboo sap vacuum carbon dioxide distillation system, characterized by: The system mainly comprises a vacuum retort (1), a condensation separator (4), a carbon dioxide storage tank (6), a liquid-liquid heater (7), and a carbon dioxide heater (8), wherein the above-mentioned equipment constitutes a vacuum system, a carbon dioxide air supply system, a carbon dioxide recycling system, a carbon dioxide retort system, a carbon dioxide cooling and preheating system, a carbon dioxide reheating system, and a carbon dioxide emission system through pipelines, control valves, and a pump body; The vacuum pumping system and the carbon dioxide gas replenishing system intersect at the carbon dioxide storage tank (6); the vacuum pumping system and the carbon dioxide recycling system intersect at the vacuum retort (1) and the carbon dioxide storage tank (6); the vacuum pumping system and the carbon dioxide retort system intersect at the vacuum retort (1); the carbon dioxide gas replenishing system and the carbon dioxide recycling system intersect at the carbon dioxide storage tank (6); the carbon dioxide recycling system and the carbon dioxide retort system intersect at the vacuum retort (1); the carbon dioxide cooling and preheating system and the carbon dioxide recycling system intersect at the condensation separator (4) and the liquid-liquid heater (7); the carbon dioxide reheating system and the carbon dioxide recycling system intersect at the carbon dioxide heater (8); The vacuum pumping system comprises a cooling water inlet pipe, a vacuum pump (9) and a vacuum water outlet pipe connected in sequence, and an exhaust pipe I connecting the vacuum retort (1) with the vacuum pump (9), and an exhaust pipe II connecting the carbon dioxide storage tank (6) with the vacuum pump (9); an inlet valve I (17-1) is provided on the cooling water inlet pipe, an outlet valve I (16-1) is installed on the vacuum water outlet pipe, and a vacuum valve I (19-1) and a vacuum valve II (19-2) are installed on the exhaust pipe I and the exhaust pipe II, respectively; The carbon dioxide replenishment system comprises a carbon dioxide inlet pipe connected to the air inlet of the carbon dioxide storage tank (6), a carbon dioxide inlet valve (18) installed on the carbon dioxide inlet pipe, a drainage pump (3) for extracting residual water from the carbon dioxide storage tank (6), and a drainage pipe, wherein a drainage valve I (10-1) is installed on the drainage pipe, and a drainage valve II (10-2) is installed on the water outlet pipe of the drainage pump (3); The carbon dioxide recycling system comprises a gas pipeline which sequentially connects a carbon dioxide storage tank (6), a liquid-liquid heater (7) and a carbon dioxide heater (8), and two groups of branch pipes arranged at the gas outlet of the carbon dioxide heater (8), one group of branch pipes being provided with a carbon dioxide outlet valve (15), and the other group of branch pipes being provided with a carbon dioxide circulation valve I (12-1) and being connected to a vacuum retort (1), the gas outlet end of the vacuum retort (1) being connected to the condensation separator (4) via a pipeline on which a carbon dioxide circulation valve II (12-2) is installed, and the condensation separator (4) is connected to the carbon dioxide storage tank (6) via a circulation fan (5); The carbon dioxide distillation system comprises a distillation pump (2); the ends of the vacuum distillation tank (1) and the condensation separator (4) are connected to the distillation pump (2) via pipelines equipped with distillation valves I (11-1) and II (11-2), respectively; and a distillation valve III (11-3) is provided on the discharge pipe of the distillation pump (2); The carbon dioxide cooling and preheating system comprises a water inlet pipe branched from the beginning of the cooling water inlet pipe and connected to the condenser separator (4), a hot water pipe connecting the water outlet of the condenser separator (4) to the liquid-liquid heater (7), and a water outlet pipe for discharging cooling water from the liquid-liquid heater (7), a water inlet valve II (17-2) installed on the water inlet pipe, and a water outlet valve II (16-2) installed on the water outlet pipe; The carbon dioxide reheating system comprises a steam pipe for inputting water vapor into the carbon dioxide heater (8), and a condensate pipe for discharging condensate from the carbon dioxide heater (8), a steam valve (14) being installed on the steam pipe, and a condensate valve (13) being installed on the condensate pipe; the carbon dioxide discharge system comprises a carbon dioxide exhaust pipe extending outward from the carbon dioxide heater (8), and a carbon dioxide outlet valve (15) being installed on the carbon dioxide exhaust pipe.

2. A process for vacuum carbon dioxide distillation of bamboo sap using the system of claim 1, characterized in that: The process comprises the following steps: S1, loading the material to be distilled into the vacuum distillation tank (1), starting the vacuum pump (9), and exhausting the gas inside the vacuum distillation tank (1) and the carbon dioxide storage tank (6) through the vacuum pumping system to form a vacuum environment; S2, starting the carbon dioxide gas replenishment system to fill the carbon dioxide storage tank (6) with carbon dioxide gas, and using the drainage pump (2) to empty the residual water inside the carbon dioxide storage tank (6); S3, the carbon dioxide gas in the carbon dioxide storage tank (6) is preheated by the liquid-liquid heater (7) and heated by the carbon dioxide heater (8) to form a high-temperature airflow, wherein the liquid-liquid heater (7) is provided with heat by high-temperature water, and the carbon dioxide heater (8) is provided with heat by water vapor; the high-temperature airflow dry-distills the material in the vacuum dry distillation tank (1), and the gas phase after dry distillation enters the condensation separator (4), and the dry distillation liquid is pumped out by the dry distillation pump (2); S4, the gas phase dry distillate produced after the treatment in step (3) enters the condensation separator (4), and cooling water enters the condensation separator (4) at the same time, and the carbon dioxide is condensed and then enters the carbon dioxide storage tank (6) through the circulation fan (5) to realize the recycling of carbon dioxide. The cooling water is heated to form high-temperature water and enters the liquid-liquid heater (7), thereby preheating the carbon dioxide coming out of the carbon dioxide storage tank (6); S5. After the carbonization is completed, the remaining carbon dioxide is input into the carbon dioxide heater (8) for recycling.

Images